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Professor James Njuguna's Outputs (116)

Fabrication with magnetic-spin coating: influence of magnetic-inertia energy ratio on gold-pickering ferrofluid droplet assembly morphology. (2024)
Journal Article
OKPOZO, P., NJUGUNA, J., ISLAM, S., UYANGA, K. and PANCHOLI, K. 2024. Fabrication with magnetic-spin coating: influence of magnetic-inertia energy ratio on gold-pickering ferrofluid droplet assembly morphology. Journal of magnetism and magnetic materials [online], 611, article number 172577. Available from: https://doi.org/10.1016/j.jmmm.2024.172577

Magnetic self-assembly of nanoparticles is a well-known technique for creating thin-film array-patterned functional microstructures. However, an uncontrollable hierarchical assembly formation of magnetically stimulated particles has hindered the desi... Read More about Fabrication with magnetic-spin coating: influence of magnetic-inertia energy ratio on gold-pickering ferrofluid droplet assembly morphology..

The state of the art in hydrogen storage. (2024)
Journal Article
REYNOLDS, J., ALI, D., NJUGUNA, J. and AMADHE, F. 2024. The state of the art in hydrogen storage. Green energy and environmental technology [online], 3(1), pages 1-40. Available from: https://doi.org/10.5772/geet.20240074

The global renewable energy mix is set to change even further with the increasing demand for hydrogen. The production levels are dramatically increasing, and it is becoming prevalent that the storage of hydrogen gas is much more complex than natural... Read More about The state of the art in hydrogen storage..

Recent developments in mechanical ultraprecision machining for nano/micro device manufacturing. (2024)
Journal Article
OLANIYAN, T., FAISAL, N. and NJUGUNA, J. 2024. Recent developments in mechanical ultraprecision machining for nano/micro device manufacturing. Micromachines [online], 15(8), article number 1030. Available from: https://doi.org/10.3390/mi15081030

The production of many components used in MEMS or NEMS devices, especially those with com-plex shapes, requires machining as the best option among manufacturing techniques. Ultraprecision machining is normally employed to achieve the required shapes,... Read More about Recent developments in mechanical ultraprecision machining for nano/micro device manufacturing..

Assessment of polymer resins as alternative abandonment barrier materials for high pressure high temperature (HPHT) wells: a multi criteria decision making approach. (2024)
Presentation / Conference Contribution
CHUKWUEMEKA, A.O., NJUGUNA, J., OLUYEMI, G. and ATTAR, S. 2024. Assessment of polymer resins as alternative abandonment barrier materials for high pressure high temperature (HPHT) wells: a multi criteria decision making approach. Presented at the 2024 SPE (Society of Petroleum Engineers) Nigeria annual international conference and exhibition (NAICE 2024), 5-7 August 2024, Lagos, Nigeria.

Portland cement is the predominant material for permanent abandonment of oil and gas wells. However, resins are increasingly finding applications in the mix of barrier materials for plug and abandonment of wells because of unique features that enable... Read More about Assessment of polymer resins as alternative abandonment barrier materials for high pressure high temperature (HPHT) wells: a multi criteria decision making approach..

A study on the factors and mechanisms facilitating renewable energy development and access in Togo. (2024)
Thesis
KANSONGUE, N. 2024. A study on the factors and mechanisms facilitating renewable energy development and access in Togo. Robert Gordon University, PhD thesis. Hosted on OpenAIR [online]. Available from: https://doi.org/10.48526/rgu-wt-2571142

Energy demand is continually increasing due to population growth, improved standard of living, as well as the widespread emergence of industries. This high demand for energy must be met by production with a reasonable reserve margin for sufficiency.... Read More about A study on the factors and mechanisms facilitating renewable energy development and access in Togo..

Quasi-static compression tests of overwrapped composite pressure vessels under low velocity impact. (2023)
Journal Article
MOHAMMED, A.I., RAGHUPATHY, K., BALTAZAR, O.D.V.G., ONOKPASAH, L., CARVALHO, R., MOGENSEN, A., HASSANI, F. and NJUGUNA, J. 2023. Quasi-static compression tests of overwrapped composite pressure vessels under low velocity impact. Composite structures [online], 327, article number 117662. Available from: https://doi.org/10.1016/j.compstruct.2023.117662

Pressure vessels are being utilised in different applications that are indispensable, including automobile, aerospace, underwater vehicles, oil and gas, and chemical engineering among others. However, there is a lack of knowledge on the influence of... Read More about Quasi-static compression tests of overwrapped composite pressure vessels under low velocity impact..

Advances in structural analysis and process monitoring of thermoplastic composite pipes. (2023)
Journal Article
OKOLIE, O., LATTO, J., FAISAL, N., JAMIESON, H., MUKHERJI, A. and NJUGUNA, J. 2023. Advances in structural analysis and process monitoring of thermoplastic composite pipes. Heliyon [online], 9(7), e17918. Available from: https://doi.org/10.1016/j.heliyon.2023.e17918

Thermoplastic composite pipes (TCP) in comparison to other pipes have proven beneficial features due to its flexibility which includes being fit for purpose, lightweight and no corrosion. However, during the manufacturing of TCP which involves the co... Read More about Advances in structural analysis and process monitoring of thermoplastic composite pipes..

Investigation on mechanical and thermal properties of 3D-printed polyamide 6, graphene oxide and glass-fibre-reinforced composites under dry, wet and high temperature conditions. (2023)
Journal Article
ICHAKPA, M., GOODYEAR, M., DUTHIE, J., DUTHIE, M., WISELY, R., MACPHERSON, A., KEYTE, J., PANCHOLI, K. and NJUGUNA, J. 2023. Investigation on mechanical and thermal properties of 3d-printed polyamide 6, graphene oxide and glass-fibre-reinforced composites under dry, wet and high temperature conditions. Journal of composites science [online], 7(6), article 227. Available from: https://doi.org/10.3390/jcs7060227

This study is focused on 3D printing of polyamide 6 (PA6), PA6/graphene oxide (PA6/GO) and PA6/glass-fibre-reinforced (PA6/GF) composites. The effect of graphene oxide and glass-fibre reinforcement on 3D-printed PA6 is explored for improvement of the... Read More about Investigation on mechanical and thermal properties of 3D-printed polyamide 6, graphene oxide and glass-fibre-reinforced composites under dry, wet and high temperature conditions..

Bio-based sustainable polymers and materials: from processing to biodegradation. (2023)
Journal Article
OKOLIE, O., KUMAR, A., EDWARDS, C., LAWTON, L.A., OKE, A., MCDONALD, S., THAKUR, V.K. and NJUGUNA, J. 2023. Bio-based sustainable polymers and materials: from processing to biodegradation. Journal of composites science [online], 7(6), article 213. Available from: https://doi.org/10.3390/jcs7060213

In the life cycle of a material, there will be either chemical or physical change due to varying environmental factors such as biological activity, light, heat, moisture, and chemical conditions. This process leads to polymer property change as perta... Read More about Bio-based sustainable polymers and materials: from processing to biodegradation..

Plug and abandonment of oil and gas wells: a comprehensive review of regulations, practices, and related impact of materials selection. (2023)
Journal Article
CHUKWUEMEKA, A.O., OLUYEMI, G., MOHAMMED, A.I. and NJUGUNA, J. 2023. Plug and abandonment of oil and gas wells: a comprehensive review of regulations, practices, and related impact of materials selection. Geoenergy science and engineering [online], 226, article 211718. Available from: https://doi.org/10.1016/j.geoen.2023.211718

This paper reviews the state of research in permanent barrier materials for plug and abandonment of oil and gas wells to identify key strengths and weaknesses of each barrier material and understand the impact of reservoir conditions and fluids on ba... Read More about Plug and abandonment of oil and gas wells: a comprehensive review of regulations, practices, and related impact of materials selection..

Structural response of a compliant pipe-in-pipe under frictionless and frictional conditions of the seabed. (2023)
Journal Article
MOHAMMED, A.I., BARTZAS, K., JOHNSON, C., SPENCE, S., SYKES, P., KIDD, G., MCCONNACHIE, J. and NJUGUNA, J. 2023. Structural response of a compliant pipe-in-pipe under frictionless and frictional conditions of the seabed. Ocean engineering [online], 276, article 114020. Available from: https://doi.org/10.1016/j.oceaneng.2023.114020

Pipe-in-Pipe (PIP) technology has been studied significantly owing to its superior performance in deep-water and high-pressure high temperature fields than conventional single pipe. The PIP system has excellent track record of mitigating flow assuran... Read More about Structural response of a compliant pipe-in-pipe under frictionless and frictional conditions of the seabed..

A PESTEL and SWOT impact analysis on renewable energy development in Togo. (2023)
Journal Article
KANSONGUE, N., NJUGUNA, J. and VERTIGANS, S. 2023. A PESTEL and SWOT impact analysis on renewable energy development in Togo. Frontiers in sustainability [online], 3, article 990173. Available from: https://doi.org/10.3389/frsus.2022.990173

Like most developing countries, Togo continues to rely on the use of traditional forms of biomass energy which causes tremendous socio-economic, environmental and health hazards. In addition, the imbalanced distribution and use of electricity, petrol... Read More about A PESTEL and SWOT impact analysis on renewable energy development in Togo..

Stress analysis of pipe-in-pipe systems under free span for deep water pipeline applications. (2023)
Journal Article
MOHAMMED, A.I., JOHNSON, C., SPENCE, S., SKYES, P. and NJUGUNA, J. 2023. Stress analysis of pipe-in-pipe systems under free span for deep water pipeline applications. Petroleum and petrochemical engineering journal [online], 7(1). Available from: https://doi.org/10.23880/ppej-16000325

This study examined the phenomena of free span for a pipe -in- pipe (PIP) system for pipeline application. Two different span length of 8 and 30 meters are modelled and simulated using nonlinear stress analysis. The effect of pressure, temperature an... Read More about Stress analysis of pipe-in-pipe systems under free span for deep water pipeline applications..

Manufacturing defects in thermoplastic composite pipes and their effect on the in-situ performance of thermoplastic composite pipes in oil and gas applications. (2022)
Journal Article
OKOLIE, O., LATTO, J., FAISAL, N., JAMIESON, H., MUKHERJI, A. and NJUGUNA, J. 2023. Manufacturing defects in thermoplastic composite pipes and their effect on the in-situ performance of thermoplastic composite pipes in oil and gas applications. Applied composite materials [online], 30(1), pages 231-306. Available from: https://doi.org/10.1007/s10443-022-10066-9

Thermoplastic composite pipes (TCP), which are a form of fibre reinforced thermoplastic pipes, have proven benefits such as being lightweight and non-corrosive. However, during manufacturing, certain defects are induced because of certain parameters,... Read More about Manufacturing defects in thermoplastic composite pipes and their effect on the in-situ performance of thermoplastic composite pipes in oil and gas applications..

A holistic power systems asset engineering and decision management framework for railway asset managers. (2022)
Preprint / Working Paper
BRUINERS, J., NJUGUNA, J. and AGARWAL, A. 2022. A holistic power systems asset engineering and decision management framework for railway asset managers. Hosted on OpenAIR [online]. Available from: https://rgu-repository.worktribe.com/output/1777336

Defining, designing and implementing an asset management system capable of effectively managing assets throughout their life in terms of engineering, financial, digital and stakeholder needs is challenging. Furthermore, governance frameworks of the p... Read More about A holistic power systems asset engineering and decision management framework for railway asset managers..

An assessment on effect of process parameters on pull force during pultrusion. (2022)
Journal Article
MUKHERJI, A. and NJUGUNA, J. 2022. An assessment on effect of process parameters on pull force during pultrusion. International journal of advanced manufacturing technology [online], 121(5-6), pages 3419-3439. Available from: https://doi.org/10.1007/s00170-022-09221-0

This research investigates the process behaviour by prediction of the pull force required to drag the raw materials through heated die at different reinforcing material configuration during pultrusion. Pultrusion is a continuous manufacturing process... Read More about An assessment on effect of process parameters on pull force during pultrusion..

Multi-criteria material selection for casing pipe in shale gas wells application. (2022)
Journal Article
MOHAMMED, A.I., BARTLETT, M., OYENEYIN, B., KAYVANTASH, K. and NJUGUNA, J. 2022. Multi-criteria material selection for casing pipe in shale gas wells application. Journal of petroleum exploration and production technology [online], 12(12), pages 3183-3199. Available from: https://doi.org/10.1007/s13202-022-01506-0

The conventional method of casing selection is based on availability and/or order placement to manufacturers based on certain design specifications to meet the anticipated downhole conditions. This traditional approach is very much dependent on exper... Read More about Multi-criteria material selection for casing pipe in shale gas wells application..

An evaluation of feedstocks for sustainable energy and circular economy practices in a small island community. (2022)
Journal Article
REYNOLDS, J., KENNEDY, R., ICHAPKA, M., AGARWAL, A., OKE, A., COX, E., EDWARDS, C. and NJUGUNA, J. 2022. An evaluation of feedstocks for sustainable energy and circular economy practices in a small island community. Renewable and sustainable energy reviews [online], 161, article 112360. Available from: https://doi.org/10.1016/j.rser.2022.112360

Maximising the use of anaerobic digestion to generate power from waste feedstocks is becoming a practical way to use waste contributing to the transition from a linear to a circular economy and reducing the carbon footprint. In addition to harnessing... Read More about An evaluation of feedstocks for sustainable energy and circular economy practices in a small island community..

Oil-based mud waste as a filler material in LDPE composites: evaluation of mechanical properties. (2022)
Journal Article
SIDDIQUE, S., NOVAK, A., GULIYEV, E., YATES, K., LEUNG, P.S. and NJUGUNA, J. 2022. Oil-based mud waste as a filler material in LDPE composites: evaluation of mechanical properties. Polymers [online], 14(7), article 1455. Available from: https://doi.org/10.3390/polym14071455

Traditionally, the drilling waste generated in oil and gas exploration operations, including spent drilling fluid, is disposed of or treated by several methods, including burial pits, landfill sites and various thermal treatments. This study investig... Read More about Oil-based mud waste as a filler material in LDPE composites: evaluation of mechanical properties..

Thermal spray coatings for electromagnetic wave absorption and interference shielding: a review and future challenges. (2022)
Journal Article
FASIAL, N.H., AHMED, R., SELLAMI, N. et al. 2022. Thermal spray coatings for electromagnetic wave absorption and interference shielding: a review and future challenges. Advanced engineering materials [online], 24(7), article number 2200171. Available from: https://doi.org/10.1002/adem.202200171

This review aims to consolidate scattered literature on thermally sprayed coatings with nonionizing electromagnetic (EM) wave absorption and shielding over specific wavelengths potentially useful in diverse applications (e.g., microwave to millimeter... Read More about Thermal spray coatings for electromagnetic wave absorption and interference shielding: a review and future challenges..

Effect of fillers on compression loading performance of modified re-entrant honeycomb auxetic sandwich structures. (2022)
Journal Article
FAISAL, N.H., SCOTT, L., BOOTH, F., DUNCAN, S., MCLEOD, A., DROUBI, M.G. and NJUGUNA, J. 2023. Effect of fillers on compression loading performance of modified re-entrant honeycomb auxetic sandwich structures. Journal of strain analysis for engineering design [online], 58(2), pages 98-117. Available from: https://doi.org/10.1177/03093247221083210

The auxetic sandwich panels for structures have been designed to provide impact protection. The aim of this work is to modify an auxetic (re-entrant) honeycomb cell to reduce the stress concentrations within the cell structure, and further enhancemen... Read More about Effect of fillers on compression loading performance of modified re-entrant honeycomb auxetic sandwich structures..

Optimising crystallisation during rapid prototyping of Fe3O4-PA6 polymer nanocomposite component. (2022)
Journal Article
GUPTA, R., NJUGUNA, J. and PANCHOLI, K. 2022. Optimising crystallisation during rapid prototyping of Fe3O4-PA6 polymer nanocomposite component. Journal of composites science [online], 6(3), article 83. Available from: https://doi.org/10.3390/jcs6030083

Polymer components capable of self-healing can rapidly be manufactured by injecting the monomer (ε-caprolactam), activator and catalyst mixed with a small amount of magnetic nanoparticles into a steel mould. The anionic polymerisation of the monomer... Read More about Optimising crystallisation during rapid prototyping of Fe3O4-PA6 polymer nanocomposite component..

Optimising crystallisation during rapid prototyping of Fe3O4-PA6 polymer nanocomposite component. [Dataset] (2022)
Data
GUPTA, R., NJUGUNA, J. and PANCHOLI, K. 2022. Optimising crystallisation during rapid prototyping of Fe3O4-PA6 polymer nanocomposite component. [Dataset]. Journal of composites science [online], 6(3), article 83. Available from: https://www.mdpi.com/2504-477X/6/3/83/s1

This paper discusses the effect of the catalyst and the activator concentrations on the properties of polymerised PA6-PMC containing 1 wt% uncoated MNPs. The focus herein is to tune the degree of crystallinity of the prepared PA6-PMC for the optimum... Read More about Optimising crystallisation during rapid prototyping of Fe3O4-PA6 polymer nanocomposite component. [Dataset].

Material challenges and opportunities in 3D printing for hip implant applications. (2022)
Journal Article
OKOLIE, O., STACHUREK, I., KANDASUBRAMANIAN, B. and NJUGUNA, J. 2022. Material challenges and opportunities in 3D printing for hip implant applications. Recent progress in materials [online], 4(1): 3D printing of engineering materials, article 2201004. Available from: https://doi.org/10.21926/rpm.2201004

There is a current need for tissue and organ repairs, replacement and regeneration for the patients who suffer from diseased/damaged tissues or organs. This situation is continuously on the rise and the supply on this form of therapy does not meet th... Read More about Material challenges and opportunities in 3D printing for hip implant applications..

An assessment of renewable energy development in energy mix for Togo. (2022)
Journal Article
KANSONGUE, N., NJUGUNA, J. and VERTIGANS, S. 2022. An assessment of renewable energy development in energy mix for Togo. International journal of sustainable energy [online], 41(8), pages 1037-1056. Available from: https://doi.org/10.1080/14786451.2021.2023150

The Togolese government plans to achieve 100% electrification to all by 2030, to meet the Millennium goals. The Delphi method is used with the experts drawn from policymakers, academic institutions, financial institutions, non-governmental institutio... Read More about An assessment of renewable energy development in energy mix for Togo..

Design and analysis of non-threaded drill pipe connector. (2022)
Thesis
THAKUR, J.O. 2022. Design and analysis of non-threaded drill pipe connector. Robert Gordon University, MRes thesis. Hosted on OpenAIR [online]. Available from: https://doi.org/10.48526/rgu-wt-2271554

This thesis determines the feasibility and application opportunities of a Snap-Latch Ring design based on the Pin and Box non-threaded connectors design. Modern drill pipes are connected by rotary threaded shouldered connections that have been prone... Read More about Design and analysis of non-threaded drill pipe connector..

The fate of waste drilling fluids from oil and gas industry activities in the exploration and production operations. (2022)
Journal Article
NJUGUNA, J., SIDDIQUE, S., KWROFFIE, L.B., PIROMRAT, S., ADDAE-AFOAKWA, K., EKEH-ADEGBOTOLU, U., OLUYEMI, G., YATES, K., MISHRA, A.K. and MOLLER, L. 2022. The fate of waste drilling fluids from oil and gas industry activities in the exploration and production. Waste management [online], 139, pages 362-380. Available from: https://doi.org/10.1016/j.wasman.2021.12.025

Operational discharges from oil and gas exploration industry, accidental spillage, or improperly disposed drilling wastes has serious detrimental effects on human and the environment. The water- and oil-based fluids wastes are generated every year al... Read More about The fate of waste drilling fluids from oil and gas industry activities in the exploration and production operations..

Determination of cure mechanism inside die for a part manufacturing during large-scale pultrusion. (2021)
Journal Article
MUKHERJI, A., TARAPORE, N. and NJUGUNA, J. 2022. Determination of cure mechanism inside die for a part manufacturing during large-scale pultrusion. Journal of applied polymer science [online], 139(17), article 52035. Available from: https://doi.org/10.1002/app.52035

The cure kinetics of resin, heat capacity and thermal conductivity of reinforcing materials of uncured mass dictates the ultimate curing of reinforced thermosets manufactured component. In this study, degree of conversion from heat capacity by ‘Lumry... Read More about Determination of cure mechanism inside die for a part manufacturing during large-scale pultrusion..

Magnetic polyamide 6 nanocomposites for increasing damage tolerance through self-healing of composite structures. (2021)
Thesis
GUPTA, R. 2021. Magnetic polyamide 6 nanocomposites for increasing damage tolerance through self-healing of composite structures. Robert Gordon University, PhD thesis. Hosted on OpenAIR [online]. Available from: https://doi.org/10.48526/rgu-wt-1987943

Self-healing materials have the ability to repeatedly repair damages that occur before complete failure of materials. The development of stimuli-responsive self-healing materials has been in demand recently for composite structures, since their failu... Read More about Magnetic polyamide 6 nanocomposites for increasing damage tolerance through self-healing of composite structures..

An investigation of casing structural integrity in shale gas horizontal wells during hydraulic fracturing using FEA and machine learning algorithms. (2021)
Thesis
MOHAMMED, A.I. 2021. An investigation of casing structural integrity in shale gas horizontal wells during hydraulic fracturing using FEA and machine learning algorithms. Robert Gordon University, PhD thesis. Hosted on OpenAIR [online]. Available from: https://doi.org/10.48526/rgu-wt-1603216

Unconventional oil and gas operators are currently facing the challenge of casing lateral buckling and/or deformation during shale gas wells stimulation through hydraulic fracturing. Failure of the casing during this process can lead to huge financia... Read More about An investigation of casing structural integrity in shale gas horizontal wells during hydraulic fracturing using FEA and machine learning algorithms..

An application of FEA and machine learning for the prediction and optimisation of casing buckling and deformation responses in shale gas wells in an in-situ operation. (2021)
Journal Article
MOHAMMED, A.I., BARTLETT, M., OYENEYIN, B., KAYVANTASH, K. and NJUGUNA, J. 2021. An application of FEA and machine learning for the prediction and optimisation of casing buckling and deformation responses in shale gas wells in an in-situ operation. Journal of natural gas science and engineering [online], 95, article 104221. Available from: https://doi.org/10.1016/j.jngse.2021.104221

This paper proposes a novel way to study the casing structural integrity using two approaches of finite element analysis (FEA) and machine learning. The approach in this study is unique, as it captures the pertinent parameters influencing the casing... Read More about An application of FEA and machine learning for the prediction and optimisation of casing buckling and deformation responses in shale gas wells in an in-situ operation..

Correction to: Swelling performance of sodium polyacrylate and poly(acrylamide‑co‑acrylic acid) potassium salt. (2021)
Journal Article
MAHON, R., BALOGUN, Y., OLUYEMI, G., and NJUGUNA, J. 2021. Correction to: Swelling performance of sodium polyacrylate and poly(acrylamide-co-acrylic acid) potassium salt. SN applied sciences [online], 3(8), article 756. Available from: https://doi.org/10.1007/s42452-021-04654-w

The original version of this Article contained an error of judgement in the inclusion of the names of the polymers and their application. The names of the polymers and their application were included, however, due to potential issues relating to conf... Read More about Correction to: Swelling performance of sodium polyacrylate and poly(acrylamide‑co‑acrylic acid) potassium salt..

The impact of thermal ageing on sealing performance of HNBR packing elements in downhole installations in oilfield wellhead applications. (2021)
Journal Article
HASSANI, F., FAISAL, N.H., NISH, R., ROTHNIE, S. and NJUGUNA, J. 2022. The impact of thermal ageing on sealing performance of HNBR packing elements in downhole installations in oilfield wellhead applications. Journal of petroleum science and engineering [online], 208(part B), article 109200. Available from: https://doi.org/10.1016/j.petrol.2021.109200

Hydrogenated nitrile butyl rubber (HNBR) elastomers are highly resistant to chemicals and degradation, and they are good candidates to be adopted in aggressive environmental conditions of high temperature and pressure. As these service parameters are... Read More about The impact of thermal ageing on sealing performance of HNBR packing elements in downhole installations in oilfield wellhead applications..

Drilling oil-based mud waste as a resource for raw materials: a case study on clays reclamation and their application as fillers in polyamide 6 composites. (2021)
Journal Article
SIDDIQUE, S., LEUNG, P.S. and NJUGUNA, J. 2021. Drilling oil-based mud waste as a resource for raw materials: a case study on clays reclamation and their application as fillers in polyamide 6 composites. Upstream oil and gas technology [online], 7, article ID 100036. Available from: https://doi.org/10.1016/j.upstre.2021.100036

To convert the hazardous oil-based mud waste into a resource, this study has addressed reclaimed nanoclays and its application as a filler material for reinforcing polyamide 6 polymer matrix into a novel polymer composite material. This work focuses... Read More about Drilling oil-based mud waste as a resource for raw materials: a case study on clays reclamation and their application as fillers in polyamide 6 composites..

Shock propagation behaviour and determination of Gruneisen state of equation for pultruded polyester/glass fibre-reinforced composites.   (2020)
Journal Article
MUKHERJI, A. and NJUGUNA, J. 2021. Shock propagation behaviour and determination of Gruneisen state of equation for pultruded polyester/glass fibre-reinforced composites. Composite structures [online], 262, article ID 113444. Available from: https://doi.org/10.1016/j.compstruct.2020.113444

Polyester fibres reinforced with glass fibres hybridised polyester resin composite (PFR/GFHC) is a unconventional complex high-molecular weight crosslinked network polymer composite. This novel composite can be used in the manufacture of structural b... Read More about Shock propagation behaviour and determination of Gruneisen state of equation for pultruded polyester/glass fibre-reinforced composites.  .

3D printing for hip implant applications: a review. (2020)
Journal Article
OKOLIE, O., STACHUREK, I., KANDASUBRAMANIAN, B. and NJUGUNA, J. 2020. 3D printing for hip implant applications: a review. Polymers [online], 12(11), articles ID 2682. Available from: https://doi.org/10.3390/polym12112682

There is a rising demand for replacement, regeneration of tissues and organ repairs for patients who suffer from diseased/damaged bones or tissues such as hip pains. The hip replacement treatment relies on the implant, which may not always meet the r... Read More about 3D printing for hip implant applications: a review..

Damping properties of flax/carbon hybrid epoxy/fibre-reinforced composites for automotive semi-structural applications. (2020)
Journal Article
FAIRLIE, G. and NJUGUNA, J. 2020. Damping properties of flax/carbon hybrid epoxy/fibre-reinforced composites for automotive semi-structural applications. Fibers [online], 8(10), article ID 64. Available from: https://doi.org/10.3390/fib8100064

The ever-increasing demand for environmentally friendly biocomposites for use in various engineering applications requires a strong understanding of these materials properties, especially in automotive applications. This study focused on investigatin... Read More about Damping properties of flax/carbon hybrid epoxy/fibre-reinforced composites for automotive semi-structural applications..

Particle emission measurements in three scenarios of mechanical degradation of polypropylene-nanoclay nanocomposites. (2020)
Journal Article
BLAZQUEZ, M., MARCHANTE, V., GENDRE, L., STAROST, K., NJUGUNA, J., SCHUTZ, J.A., LACAVE, J.M., EGIZABAL, A., ELIZETXEA, C. and CAJARAVILLE, M.P. 2020. Particle emission measurements in three scenarios of mechanical degradation of polypropylene-nanoclay nanocomposites. Journal of aerosol science [online], 150, article ID 105629. Available from: https://doi.org/10.1016/j.jaerosci.2020.105629

Researchers and legislators have both claimed the necessity to standardize the exposure assessment of polymer nanocomposites throughout their life cycle. In the present study we have developed and compared three different and independent operational... Read More about Particle emission measurements in three scenarios of mechanical degradation of polypropylene-nanoclay nanocomposites..

Lightweight, affordable, low power solar groundwater piston pump for rural remote regions. (2020)
Thesis
AZEEM UDDIN, A.I. 2020. Lightweight, affordable, low power solar groundwater piston pump for rural remote regions. Robert Gordon University, PhD thesis. Hosted on OpenAIR [online]. Available from: https://doi.org/10.48526/rgu-wt-1254576

Solar photovoltaic powered groundwater pumping systems (SPWPS) are popular way of fetching water from boreholes in semi-arid areas in rural remote regions of most developing countries, where commercial water and electricity supply is out of reach. As... Read More about Lightweight, affordable, low power solar groundwater piston pump for rural remote regions..

Oil-based mud waste reclamation and utilisation in low-density polyethylene composites. (2020)
Journal Article
SIDDIQUE, S., YATES, K., MATTHEWS, K., CSETENYI, L.J. and NJUGUNA, J. 2020. Oil-based mud waste reclamation and utilisation in low-density polyethylene composites. Waste management and research [online], 38(12), pages 1331-1344. Available from: https://doi.org/10.1177/0734242X20941076

Oil-based mud (OBM) waste from the oil and gas exploration industry can be valorised to tailor-made reclaimed clay-reinforced low-density polyethylene (LDPE) nanocomposites. This study aims to fill the information gap in the literature and to provide... Read More about Oil-based mud waste reclamation and utilisation in low-density polyethylene composites..

Assessment of nanoparticle emission of polypropylene, polyester and epoxy nanocomposites during automated drilling process. (2020)
Thesis
STAROST, K.J. 2020. Assessment of nanoparticle emission of polypropylene, polyester and epoxy nanocomposites during automated drilling process. Robert Gordon University [online], PhD thesis. Available from: https://openair.rgu.ac.uk

Polymer nanocomposites are becoming established widely across the industry due to (among other reasons) their lightweight performance advantages, and ability to meticulously target material properties with great control and precision. Despite the ben... Read More about Assessment of nanoparticle emission of polypropylene, polyester and epoxy nanocomposites during automated drilling process..

A novel research approach for whole-life-cycle electrical power systems asset management using retroductive case study method. (2020)
Journal Article
BRUINERS, J., NJUGUNA, J. and AGARWAL, A. 2020. A novel research approach for whole-life-cycle electrical power systems asset management using retroductive case study method. Innovative energy and research [online], 9(2), article number 1000234. Available from: https://www.omicsonline.org/open-access/a-novel-research-approach-for-wholelifecycle-electrical-power-systems-asset-management-using-retroductive-case-study-met.pdf

There are a vast number of complex influences on power systems assets both individually and as a collection of systems of assets. The complexities when governing what and when to intervene with these assets is played out over varying time frames and... Read More about A novel research approach for whole-life-cycle electrical power systems asset management using retroductive case study method..

Insulating MgO–Al2O3–LDPE nanocomposites for offshore medium-voltage DC cables. (2020)
Journal Article
GUPTA, R., SMITH, L., NJUGUNA, J., DEIGHTON, A. and PANCHOLI, K. 2020. Insulating MgO–Al2O3–LDPE nanocomposites for offshore medium-voltage DC cables. ACS applied electronic materials [online], 2(7), pages 1880-1891. Available from: https://doi.org/10.1021/acsaelm.0c00052

A polymer–metal oxide nanocomposite is a key in developing a high-temperature insulation material for power electronics and high-voltage direct current (HVDC) and medium-voltage direct current (MVDC) subsea cables having the capability of transmittin... Read More about Insulating MgO–Al2O3–LDPE nanocomposites for offshore medium-voltage DC cables..

The influence of graphene oxide on nanoparticle emissions during drilling of graphene/epoxy carbon-fiber reinforced engineered nanomaterials. (2020)
Journal Article
STAROST, K. and NJUGUNA, J. 2020. The influence of graphene oxide on nanoparticle emissions during drilling of graphene/epoxy carbon-fiber reinforced engineered nanomaterials. Atmosphere [online], 11(6), article number 573. Available from: https://doi.org/10.3390/atmos11060573

Graphene oxide (GO) nanoparticles are increasingly being used to tailor industrial composites. However, despite the advantages, GO has shown conceivable health risks and toxicity to humans and the environment if released. This study investigates the... Read More about The influence of graphene oxide on nanoparticle emissions during drilling of graphene/epoxy carbon-fiber reinforced engineered nanomaterials..

Processing, structure and thermo-mechanical properties of reclaimed nanoclay, and its application in polyamide 6 and low-density polyethylene nanocomposites. (2020)
Thesis
SIDDIQUE, S.A. 2020. Processing, structure and thermo-mechanical properties of reclaimed nanoclay, and its application in polyamide 6 and low-density polyethylene nanocomposites. Robert Gordon University [online], PhD thesis. Available from: https://openair.rgu.ac.uk

Oil-based mud (OBM) wastes are generated every year all over the world, and remain a serious challenge for the oil and gas industry. The potential solution for this global problem is either to destroy these hazardous chemicals completely - a signific... Read More about Processing, structure and thermo-mechanical properties of reclaimed nanoclay, and its application in polyamide 6 and low-density polyethylene nanocomposites..

UHMWPE for biomedical applications: performance and functionalization. (2020)
Journal Article
AVINASH PATIL, N., NJUGUNA, J. and KANDASUBRAMANIAN, B. 2020. UHMWPE for biomedical applications: performance and functionalization. European polymer journal [online], 125, article ID 109529. Available from: https://doi.org/10.1016/j.eurpolymj.2020.109529

According to a survey conducted by Grand View Research, the market demand for medical grade UHMWPE has raise remarkably from 60.9 kilotons up to 204.8 kilotons during 2015–2024 valued at $1.36 billion (USD) with a compound annual growth rate of 15%.... Read More about UHMWPE for biomedical applications: performance and functionalization..

Swelling performance of sodium polyacrylate and poly(acrylamide-co-acrylic acid) potassium salt. (2019)
Journal Article
MAHON, R., BALOGUN, Y., OLUYEMI, G. and NJUGUNA, J. 2020. Swelling performance of sodium polyacrylate and poly (acrylamide-co-acrylic acid) potassium salt. SN applied sciences [online], 2(1), article ID 117. Available from: https://doi.org/10.1007/s42452-019-1874-5

The application of superabsorbent polymer hydrogels in the oil and gas industry for reservoir and well management is gaining more traction. In this study, the swelling performance and adsorption kinetics of two commercial superabsorbent polymer hydro... Read More about Swelling performance of sodium polyacrylate and poly(acrylamide-co-acrylic acid) potassium salt..

Prediction of casing critical buckling during shale gas hydraulic fracturing. (2019)
Journal Article
MOHAMMED, A.I., OYENEYIN, B., BARTLETT, M. and NJUGUNA, J. 2020. Prediction of casing critical buckling during shale gas hydraulic fracturing. Journal of petroleum science and engineering [online], 185, article ID 106655. Available from: https://doi.org/10.1016/j.petrol.2019.106655

Casing deformation during volume fracturing in shale gas horizontal wells is caused by both existing and induced stresses. These stresses jointly alter and compound the stress field around the casing leading to inefficient well stimulation as planned... Read More about Prediction of casing critical buckling during shale gas hydraulic fracturing..

Recent developments in graphene oxide/epoxy carbon fiber-reinforced composites. (2019)
Journal Article
KEYTE, J., PANCHOLI, K. and NJUGUNA, J. 2019. Recent developments in graphene oxide/epoxy carbon fiber-reinforced composites. Frontiers in materials [online], 6, article ID 224. Available from: https://doi.org/10.3389/fmats.2019.00224

The two-dimensional macro molecule graphene and its derivatives have widely been investigated for their application as nanofiller in carbon fibre-reinforced composites (CFRC). Research has progressed from techniques that simply mix graphene as a mixi... Read More about Recent developments in graphene oxide/epoxy carbon fiber-reinforced composites..

Exploration of elastomeric and polymeric liquid crystals with photothermal actuation: a review. (2019)
Journal Article
RASTOGI, P., NJUGUNA, J. and KANDASUBRAMANIAN, B. 2019. Exploration of elastomeric and polymeric liquid crystals with photothermal actuation: a review. European polymer journal [online], 121, article ID. 109287. Available from: https://doi.org/10.1016/j.eurpolymj.2019.109287

Recent research in soft materials is an exhilarating category which has been transcending boundaries for variety of functional applications. This category also stems liquid crystals whose stimuli-responsive feature has fantasized researchers for appl... Read More about Exploration of elastomeric and polymeric liquid crystals with photothermal actuation: a review..

Effect of oleic acid coating of iron oxide nanoparticles on properties of magnetic polyamide-6 nanocomposite. (2019)
Journal Article
GUPTA, R., PANCHOLI, K., DE SA, R., MURRAY, D., HUO, D., DROUBI, G., WHITE, M. and NJUGUNA, J. 2019. Effect of oleic acid coating of iron oxide nanoparticles on properties of magnetic polyamide-6 nanocomposite. JOM [online], 71(9), pages 3119-3128. Available from: https://doi.org/10.1007/s11837-019-03622-5

This work reports the development and testing of a magnetic polymer (Polyamide 6, PA6) nanocomposite capable of melting when exposed to an external magnetic field. Addition of high concentrations of iron oxide nanoparticles (NPs) can induce quick mel... Read More about Effect of oleic acid coating of iron oxide nanoparticles on properties of magnetic polyamide-6 nanocomposite..

Casing structural integrity and failure modes in a range of well types: a review. (2019)
Journal Article
MOHAMMED, A.I., OYENEYIN, B., ATCHISON, B. and NJUGUNA, J. 2019. Casing structural integrity and failure modes in a range of well types: a review. Journal of natural gas science and engineering [online], 68, article ID 102898. Available from: https://doi.org/10.1016/j.jngse.2019.05.011

This paper focus on factors attributing to casing failure, their failure mechanism and the resulting failure mode. The casing is a critical component in a well and the main mechanical structural barrier element that provide conduits and avenue for oi... Read More about Casing structural integrity and failure modes in a range of well types: a review..

Structural and thermal degradation behaviour of reclaimed clay nano-reinforced low density polyethylene nanocomposites. (2019)
Journal Article
SIDDIQUE, S., SMITH, G.D., YATES, K., MISHRA, A.K., MATTHEWS, K., CSETENYI, L.J. and NJUGUNA, J. 2019. Structural and thermal degradation behaviour of reclaimed clay nano-reinforced low-density polyethylene nanocomposites. Journal of polymer research [online], 26, article ID 154. Available from: https://doi.org/10.1007/s10965-019-1802-9

In this study, a novel reclaimed clay nanofiller used to manufacture low-density polyethylene (LDPE)/Oil based mud fillers (OBMFs) nanocomposites by a melt compounding process. The mechanical testing samples were manufactured using injection mouldin... Read More about Structural and thermal degradation behaviour of reclaimed clay nano-reinforced low density polyethylene nanocomposites..

Influence of reduced graphene oxide on epoxy/carbon fibre-reinforced hybrid composite: flexural and shear properties under varying temperature conditions. (2019)
Journal Article
JENKINS, P., SIDDIQUE, S., KHAN, S., USMAN, A., STAROST, K., MACPHERSON, A., BARI, P., MISHRA, S. and NJUGUNA, J. 2019. Influence of reduced graphene oxide on epoxy/carbon fibre-reinforced hybrid composite: flexural and shear properties under varying temperature conditions. Advanced engineering materials [online], 21(6), article ID 1800614. Available from: https://doi.org/10.1002/adem.201800614

This study investigated the effectiveness of reduced graphene oxide as nanofiller in enhancing epoxy/carbon fibre-reinforced composite at varying temperature conditions. The graphene oxide was synthesised using modified Hummer’s method and then chemi... Read More about Influence of reduced graphene oxide on epoxy/carbon fibre-reinforced hybrid composite: flexural and shear properties under varying temperature conditions..

The crystallinity and thermal degradation behaviour of polyamide 6/oil based mud fillers (PA6/OBMFs) nanocomposites. (2018)
Journal Article
SIDDIQUE, S., KWOFFIE, L., ADDAE-AFOAKWA, K., YATES, K. and NJUGUNA, J. 2019. The crystallinity and thermal degradation behaviour of polyamide 6/oil based mud fillers (PA6/OBMFs) nanocomposites. Polymer degradation and stability [online], 159, pages 139-152. Available from: https://doi.org/10.1016/j.polymdegradstab.2018.11.004

The crystallinity and thermal degradation behaviours of Polyamide 6/Oil Based Mud Fillers (PA6/OBMFs) nanocomposites have been investigated using DSC and TGA. TGA indicates the onset decomposition temperature of D1/2 (half-decomposition) is 16º C hig... Read More about The crystallinity and thermal degradation behaviour of polyamide 6/oil based mud fillers (PA6/OBMFs) nanocomposites..

Sustainable energy for emerging nations development: a case study on Togo renewable energy. (2018)
Presentation / Conference Contribution
KANSONGUE, N., NJUGUNA, J. and VERTIGANS, S. 2018. Sustainable energy for emerging nations development: a case study on Togo renewable energy. In Proceedings of the Institute of Electrical and Electronics Engineers (IEEE) Power and Energy Society (PES) and Industrial Applications Society (IAS) PowerAfrica 2018 conference, 26-29 June 2018, Cape Town, South Africa. Piscataway, NJ: IEEE [online], pages 137-141. Available from: https://doi.org/10.1109/PowerAfrica.2018.8521054

This paper explores the need for an appropriate energy delivery, placing emphasis on the role of the indigenous people in developing their future needs. The case study is based on Togo renewable energy sustainability and employs qualitative and quant... Read More about Sustainable energy for emerging nations development: a case study on Togo renewable energy..

Abstract book for the proceedings of the 4th International conference on structural nano composites (NANOSTRUC 2018), 23-24 May 2018, Berlin, Germany. (2018)
Presentation / Conference Contribution
NJUGUNA, J. and NGO, H.-D. (eds.) 2018. Abstract book for the proceedings of the 4th International conference on structural nano composites (NANOSTRUC 2018), 23-24 May 2018, Berlin, Germany [online]. Available from: https://www.nanostruc.info/nanostruc-conference.html

The purpose of The 4th International Conference on Structural Nano Composites (NANOSTRUC2018) is to promote activities in various areas of materials and structures by providing a forum for exchange of ideas, presentation of technical achievements and... Read More about Abstract book for the proceedings of the 4th International conference on structural nano composites (NANOSTRUC 2018), 23-24 May 2018, Berlin, Germany..

Cross sensitivity analysis of optical fibre-based sensing for high pressure, high temperature measurement in oil and gas applications. (2018)
Thesis
AMOS, S.U. 2018. Cross sensitivity analysis of optical fibre-based sensing for high pressure, high temperature measurement in oil and gas applications. Robert Gordon University, PhD thesis.

Measurements of physical parameters like pressure, temperature, flow rate, vibrations and displacement in harsh environment are often desired in the oil and gas industry. Pressure and temperature are the most important parameters among them. Changes... Read More about Cross sensitivity analysis of optical fibre-based sensing for high pressure, high temperature measurement in oil and gas applications..

Mechanical structural design of a MEMS-based piezoresistive accelerometer for head injuries monitoring: a computational analysis by increments of the sensor mass moment of inertia. (2018)
Journal Article
MESSINA, M., NJUGUNA, J. and PALAS, C. 2018. Mechanical structural design of a MEMS-based piezoresistive accelerometer for head injuries monitoring: a computational analysis by increments of the sensor mass moment of inertia. Sensors [online], 18(1), article number 289. Available from: https://doi.org/10.3390/s18010289

This work focuses on the proof-mass mechanical structural design improvement of a tri-axial piezoresistive accelerometer specifically designed for head injuries monitoring where medium-G impacts are common; for example, in sports such as racing cars... Read More about Mechanical structural design of a MEMS-based piezoresistive accelerometer for head injuries monitoring: a computational analysis by increments of the sensor mass moment of inertia..

Removal of lead (II) from aqeouos waste using (CD-PCL-TiO2) bio-nanocomposites. (2017)
Journal Article
SEEMA, K.M., MAMBA, B.B., NJUGUNA, J., BAKHTIZIN, R.Z. and MISHRA, A.K. 2018. Removal of lead (II) from aqeouos waste using (CD-PCL-TiO2) bio-nanocomposites. International journal of biological macromolecules [online], 109, pages 136-142. Available from: https://doi.org/10.1016/j.ijbiomac.2017.12.046

Lead (Pb) pollution is our water system is a major concern, as this metal is toxic even at low concentration. This study aim to fabricate a bio-nanocomposite (cyclodextrin-polycaprolactone titanium dioxide) that will be used as an adsorbent for the r... Read More about Removal of lead (II) from aqeouos waste using (CD-PCL-TiO2) bio-nanocomposites..

Computational analysis and optimization of a MEMS-based piezoresistive accelerometer for head injuries monitoring. (2017)
Presentation / Conference Contribution
MESSINA, M., NJUGUNA, J. and PALAS, C. 2017. Computational analysis and optimization of a MEMS-based piezoresistive accelerometer for head injuries monitoring. In Proceedings of the 2017 IEEE sensors conference, 29 October - 1 November 2017, Glasgow, UK. New York: IEEE [online], article number 8233897, pages 91-93. Available from: https://doi.org/10.1109/ICSENS.2017.8233897

This work focuses on the design improvement of a tri-axial piezoresistive accelerometer specifically designed for head injuries monitoring where medium-G impacts are common, for example in sports such as racing cars. The device requires the highest s... Read More about Computational analysis and optimization of a MEMS-based piezoresistive accelerometer for head injuries monitoring..

Assessment of nanoparticles release into the environment during drilling of carbon nanotubes/epoxy and carbon nanofibres/epoxy nanocomposites. (2017)
Journal Article
STAROST, K., FRIJNS, E., VAN LAER, J., FAISAL, N., EGIZABAL, A., ELIZEXTEA, C., BLAZQUEZ, M., NELISSEN, I. and NJUGUNA, J. 2017. Assessment of nanoparticles release into the environment during drilling of carbon nanotubes/epoxy and carbon nanofibres/epoxy nanocomposites. Journal of hazardous materials [online], 340, pages 57-66. Available from: https://doi.org/10.1016/j.jhazmat.2017.06.057

The risk assessment, exposure and understanding of the release of embedded carbon nanotubes (CNTs) and carbon nanofibers (CNFs) from commercial high performance composites during machining processes is yet to be fully evaluated and quantified. In thi... Read More about Assessment of nanoparticles release into the environment during drilling of carbon nanotubes/epoxy and carbon nanofibres/epoxy nanocomposites..

Theoretical design and analysis of a sensing system for high pressure and temperature measurement in subsea underwater applications. (2017)
Presentation / Conference Contribution
AMOS, S., PRABHU, R. and NJUGUNA, J. 2017. Theoretical design and analysis of a sensing system for high pressure and temperature measurement in subsea underwater applications. In Proceedings of OCEANS 2017, 19-22 June 2017, Aberdeen, UK. New York: IEEE [online], article number 8085023, pages 2680-2686. Available from: https://doi.org/10.1109/OCEANSE.2017.8085023

The theoretical design and analysis of a metal coated hybrid sensing system of Fibre Bragg Grating (FBG) and Extrinsic Fabry-Perot Interferometer (EFPI) cavity for high pressure high temperature (HPHT) measurement in subsea underwater applications is... Read More about Theoretical design and analysis of a sensing system for high pressure and temperature measurement in subsea underwater applications..

The effect of nanosilica (SiO2) and nanoalumina (Al2O3) reinforced polyester nanocomposites on aerosol nanoparticle emissions into the environment during automated drilling. (2017)
Journal Article
STAROST, K., FRIJNS, E., VAN LAER, J., FAISAL, N., EGIZABAL, A., ELIZEXTEA, C., NEILSSEN, I., BALZQUEZ, M. and NJUGUNA, J. 2017. The effect of nanosilica (SiO2) and nanoalumina (Al2O3) reinforced polyester nanocomposites on aerosol nanoparticle emissions into the environment during automated drilling. Aerosol science and technology [online], 51(9), pages 1035-1046. Available from: https://doi.org/10.1080/02786826.2017.1330535

The aim of this study is to investigate the effect nanosilica and nanoalumina has on nanoparticle release from industrial nanocomposites due to drilling for hazard reduction whilst simultaneously obtaining the necessary mechanical performance. This s... Read More about The effect of nanosilica (SiO2) and nanoalumina (Al2O3) reinforced polyester nanocomposites on aerosol nanoparticle emissions into the environment during automated drilling..

Elaboration of properties of graphene oxide reinforced epoxy nanocomposites. (2017)
Journal Article
BARI, P., KHAN, S., NJUGUNA, J. and MISHRA, S. 2017. Elaboration of properties of graphene oxide reinforced epoxy nanocomposites. International journal of plastics technology [online], 21(1), pages 194-208. Available from: https://doi.org/10.1007/s12588-017-9180-9

In this research work, properties of graphene oxide (GO) based epoxy nanocomposites, prepared via the solution blending method, are elaborated. Different loadings (0.1-0.5 wt%) of GO were added into epoxy resin, and their effects were studied on thei... Read More about Elaboration of properties of graphene oxide reinforced epoxy nanocomposites..

Oil based drilling fluid waste: an overview on environmentally persistent pollutants. (2017)
Presentation / Conference Contribution
SIDDIQUE, S., KWOFFIE, L., ADDAE-AFOAKWA, K., YATES, K. and NJUGUNA, J. 2016. Oil based drilling fluid waste: an overview on environmentally persistent pollutants. IOP conference series: materials science and engineering [online], 195: proceedings of the 3rd International conference on structural nano composites (NANOSTRUC 2016), 12-16 September 2016, Aberdeen, UK, article number 012008. Available from: https://doi.org/10.1088/1757-899X/195/1/012008

Operational discharges of spent drilling fluid, produced water, and accumulated drill cuttings from oil and gas industry are a continuous point source of environmental pollution. To meet the strict environmental standard for waste disposal, oil and g... Read More about Oil based drilling fluid waste: an overview on environmentally persistent pollutants..

Tensile and flexural properties of hybrid graphene oxide/epoxy carbon fibre reinforced composites. (2017)
Presentation / Conference Contribution
WATSON, G., STAROST, K., BARI, P., FAISAL, N., MISHRA, S. and NJUGUNA, J. 2016. Tensile and flexural properties of hybrid graphene oxide/epoxy carbon fibre reinforced composites. IOP conference series: materials science and engineering [online], 195: proceedings of the 3rd International conference on structural nano composites (NANOSTRUC 2016), 12-16 September 2016, Aberdeen, UK, article number 012009. Available from: https://doi.org/10.1088/1757-899X/195/1/012009

In this study, nano-sized graphene oxide sheets were homogenously dispersed via sonication methods in epoxy followed by vacuum resin infusion for the fabrication of the epoxy, graphene oxide (GO) and micro-sized carbon fibre reinforced nanocomposites... Read More about Tensile and flexural properties of hybrid graphene oxide/epoxy carbon fibre reinforced composites..

Environmental particle emissions due to automated drilling of polypropylene composites and nanocomposites reinforced with talc, montmorillonite and wollastonite. (2017)
Presentation / Conference Contribution
STAROST, K., FRIJNS, E., LAER, J.V., FAISAL, N., EGIZABAL, A., ELIZEXTEA, C., NELISSEN, I., BLAZQUEZ, M. and NJUGUNA, J. 2016. Environmental particle emissions due to automated drilling of polypropylene composites and nanocomposites reinforced with talc, montmorillonite and wollastonite. IOP conference series: materials science and engineering [online], 195: proceedings of the 3rd International conference on structural nano composites (NANOSTRUC 2016), 12-16 September 2016, Aberdeen, UK, article number 012011. Available from: https://doi.org/10.1088/1757-899X/195/1/012011

In this study, the effect on nanoparticle emissions due to drilling on Polypropylene (PP) reinforced with 20% talc, 5% montmorillonite (MMT) and 5% Wollastonite (WO) is investigated. The study is the first to explore the nanoparticle release from WO... Read More about Environmental particle emissions due to automated drilling of polypropylene composites and nanocomposites reinforced with talc, montmorillonite and wollastonite..

The 3rd international conference on structural nano composites (NANOSTRUC2016). (2017)
Journal Article
NJUGUNA, J. 2017. The 3rd international conference on structural nano composites (NANOSTRUC2016). IOP conference series: materials science and engineering [online], 195: proceedings of 3rd International conference on structural nano composites (NANOSTRUC2016): Nanoscience and nanotechnologies; recent advances towards nanoproducts and applications, 12-15 September 2016, Aberdeen, UK, article 011001. Available from: https://doi.org/10.1088/1757-899X/195/1/011001

The Robert Gordon University, Aberdeen hosted The NANOSTRUC 2016 in Aberdeen (Scotland, United Kingdom). The conference focused on 'Nanoscience and Nanotechnologies – Recent Advances towards Nanoproducts and Applications'. It promoted activities in v... Read More about The 3rd international conference on structural nano composites (NANOSTRUC2016)..

Physico‐mechanical properties of nano‐polystyrene‐decorated graphene oxide–epoxy composites. (2017)
Journal Article
KHOBRAGADE, P.S., HANSORA, D.P., NAIK, J.B., NJUGUNA, J. and MISHRA, S. 2017. Physico-mechanical properties of nano polystyrene decorated graphene oxide-epoxy composites. Polymer international [online], 66(10), pages 1402-1409. Available from: https://doi.org/10.1002/pi.5392

In this work, nano polystyrene (nPS) decorated graphene oxide (GO) hybrid nanostructures were successfully synthesized using stepwise micro emulsion polymerization, and characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffractom... Read More about Physico‐mechanical properties of nano‐polystyrene‐decorated graphene oxide–epoxy composites..

Effect of multilayered nanostructures on the physico-mechanical properties of ethylene vinyl acetate-based hybrid nanocomposites. (2017)
Journal Article
KHOBRAGADE, P.S., HANSORA, D.P., NAIK, J.B., NJUGUNA, J. and MISHRA, S. 2018. Effect of multilayered nanostructures on the physico-mechanical properties of ethylene vinyl acetate-based hybrid nanocomposites. Polymer composites [online], 39(10), pages 3519-3527. Available from: https://doi.org/10.1002/pc.24371

Exfoliated graphene oxide (GO) and Mg-Al-layered double hydroxides (LDHs) nanostructures (LDHs@GO)-filled ethylene vinyl acetate (EVA)-based hybrid nanocomposites were prepared by solution reflux technique followed by injection molding. The physico-m... Read More about Effect of multilayered nanostructures on the physico-mechanical properties of ethylene vinyl acetate-based hybrid nanocomposites..

Core-double shell hybrid nanocomposites as multi-functional advanced materials. (2017)
Journal Article
KHOBRAGADE, P.S., HANSORA, D.P., NAIK, J.B., NJUGUNA, J. and MISHRA, S. 2017. Core-double shell hybrid nanocomposites as multi-functional advanced materials. Polymer bulletin [online], 74(11), pages 4681-4700. Available from: https://doi.org/10.1007/s00289-017-1983-5

In this research work, we report circular type silane-modified CaCO3 (as core) nanoparticles (NP) encapsulated with polystyrene (PS) and polymethyl methacrylate (PMMA) (as double shell layers). These core-double shell [CaCO3-PS/PMMA] hybrid nanostruc... Read More about Core-double shell hybrid nanocomposites as multi-functional advanced materials..

Demulsification and recycling of spent oil based drilling fluid as nanofiller for polyamide 6 nanocomposites. (2016)
Thesis
ADEGBOTOLU, U.V. 2016. Demulsification and recycling of spent oil based drilling fluid as nanofiller for polyamide 6 nanocomposites. Robert Gordon University, PhD thesis.

Spent oil-based drilling fluid and cutting wastes are global liabilities due to their hazardous hydrocarbon content, which impacts negatively on flora, fauna, and global carbon footprint. The formulation of two demulsifiers to ensure chemically-enhan... Read More about Demulsification and recycling of spent oil based drilling fluid as nanofiller for polyamide 6 nanocomposites..

Abstract book for the proceedings of the 3rd International conference on structural nano composites (NANOSTRUC 2016), 12-15 September 2016, Aberdeen, UK. (2016)
Presentation / Conference Contribution
STAROST, K. and NJUGUNA, J. (eds.) 2016. Abstract book for the proceedings of the 3rd International conference on structural nano composites (NANOSTRUC 2016), 12-15 September 2016, Aberdeen, UK. Berlin: Nanostruc [online]. Available from: https://web.archive.org/web/20180123120946/http://www.nanostruc.info/nanostruc-conference.html

The theme of the 3rd NANOSTRUC 2016 conference is on ‘Nanoscience and Nanotechnologies – Recent Advances towards Nanoproducts and Applications’. The conference is aimed to promote activities in various areas on materials and structures by providing a... Read More about Abstract book for the proceedings of the 3rd International conference on structural nano composites (NANOSTRUC 2016), 12-15 September 2016, Aberdeen, UK..

Preparation and analysis of multi-layered hybrid nanostructures. (2016)
Journal Article
KHOBRAGADE, P.S., HANSORA, D.P., NAIK, J.B., NJUGUNA, J. and MISHRA, S. 2016. Preparation and analysis of multi-layered hybrid nanostructures. Applied clay science [online], 132-133, pages 668-674. Available from: https://doi.org/10.1016/j.clay.2016.08.022

In this study, we report a simple and efficient (bath ultrasonication) method for the preparation of multi-functional layered hybrid nanostructures using graphene oxide (GO) and modified Mg-Al layered double hydroxides (LDH) [LDH@GO]. The functional... Read More about Preparation and analysis of multi-layered hybrid nanostructures..

Stress analysis at the interface of metal-to-metal adhesively bonded joints subjected to 4-point bending: finite element method. (2016)
Journal Article
PRATHURU, A.K., FAISAL, N.H., JIHAN, S., STEEL, J.A. and NJUGUNA, J. 2017. Stress analysis at the interface of metal-to-metal adhesively bonded joints subjected to 4-point bending: finite element method. Journal of adhesion [online], 93(11), pages 855-878. Available from: https://doi.org/10.1080/00218464.2016.1172309

This paper presents a study of stress states in two-dimensional models of metal-to-metal adhesively bonded joints subjected to 4-point flexural loading using the finite element (FE) method. The FE simulations were carried out on adhesive bonded joint... Read More about Stress analysis at the interface of metal-to-metal adhesively bonded joints subjected to 4-point bending: finite element method..

Flexural, impact, rheological and physical characterizations of POM reinforced by carbon nanotubes and paraffin oil. (2016)
Journal Article
YOUSEF, S., VISCO, A., GALTIERI, G and NJUGUNA, J. 2016. Flexural, impact, rheological and physical characterizations of POM reinforced by carbon nanotubes and paraffin oil. Polymers for advanced technologies [online], 27(10), pages 1338-1344. Available from: https://doi.org/10.1002/pat.3801

The paraffin oil dispersion technique innovated in the recent years to synthesize bulk polymer nanocomposite materials has a uniform dispersion. This research work aims to study the effect of added carbon nanotubes (CNTs) on flexural, impact and rheo... Read More about Flexural, impact, rheological and physical characterizations of POM reinforced by carbon nanotubes and paraffin oil..

Thermal, mechanical and rheological behaviors of nanocomposites based on UHMWPE/paraffin oil/carbon nanofiller obtained by using different dispersion techniques. (2016)
Journal Article
VISCO, A., YOUSEF, S., GALTIERI, G., NOCITA, D., PISTONE, A. and NJUGUNA, J. 2016. Thermal, mechanical and rheological behaviors of nanocomposites based on UHMWPE/paraffin oil/carbon nanofiller obtained by using different dispersion techniques. JOM: journal of the Minerals, Metals and Materials Society [online], 68(4), pages 1078-1089. Available from: https://doi.org/10.1007/s11837-016-1845-x

Ultra-high molecular weight polyethylene (UHMWPE) is a very attractive polymer employed as a high performance material. For its high viscosity, dispersion of fillers is considered a critical point in UHMWPE nanocomposites preparation process. Current... Read More about Thermal, mechanical and rheological behaviors of nanocomposites based on UHMWPE/paraffin oil/carbon nanofiller obtained by using different dispersion techniques..

Futuristic nanomaterials and composites: part II. (2015)
Journal Article
KIM, C-S., LEHMHUS, D., NJUGUNA, J., PARAMSOTHY, M. and SHOFNER, M.L. 2015. Futuristic nanomaterials and composites: part II. JOM: journal of the Minerals, Metals and Materials Society [online], 68(1), pages 261-264. Available from: https://doi.org/10.1007/s11837-015-1685-0

The present special topic Futuristic Nanomaterials and Composites: Part II is a continuation of last month's topic Futuristic Nanomaterials and Composites: Part I. In this continuation, inspiration is once again drawn from two conferences: (1) NANOST... Read More about Futuristic nanomaterials and composites: part II..

Wear characterizations of polyoxymethylene (POM) reinforced with carbon nanotubes (POM/CNTs) using the paraffin oil dispersion technique. (2015)
Journal Article
YOUSEF, S., VISCO, A.M., GALTIERI, G. and NJUGUNA, J. 2016. Wear characterizations of polyoxymethylene (POM) reinforced with carbon nanotubes (POM/CNTs) using the paraffin oil dispersion technique. JOM: journal of the Minerals, Metals and Materials Society [online], 68(1), pages 288-299. Available from: https://doi.org/10.1007/s11837-015-1674-3

The wear of polyoxymethylene (POM) is considered a key design parameter of polymer gears and some mechanical applications, and it determines the service time span. This work investigates the influence of carbon nanotubes (CNTs) on the specific wear r... Read More about Wear characterizations of polyoxymethylene (POM) reinforced with carbon nanotubes (POM/CNTs) using the paraffin oil dispersion technique..

Futuristic nanomaterials and composites: part I. (2015)
Journal Article
LEHMHUS, D., NJUGUNA, J. and PARAMSOTHY, M. 2015. Futuristic nanomaterials and composites: part I. JOM: journal of the Minerals, Metals and Materials Society [online], 67(12), pages 2844-2847. Available from: https://doi.org/10.1007/s11837-015-1619-x

The present special topic 'Futuristic Nanomaterials and Composites: Part I' captures the structural as well as functional aspects of nanomaterials and nanocomposites that are unique in some specific way when compared to their microscale counterparts.... Read More about Futuristic nanomaterials and composites: part I..

Compression-after-impact (CAI) performance of epoxycarbon fibre-reinforced nanocomposites using nanosilica and rubber particle enhancement. (2014)
Journal Article
NIKFAR, B. and NJUGUNA, J. 2014. Compression-after-impact (CAI) performance of epoxycarbon fibre-reinforced nanocomposites using nanosilica and rubber particle enhancement. IOP conference series: materials science and engineering [online], 64(1), Article 012009. Available from: https://doi.org/10.1088/1757-899X/64/1/012009

One of the problems in the design of automotive structures and body parts made by fibre reinforced composites is that these materials are susceptible to a small energy impact caused by for instance, accidental tool drop during maintenance or stone st... Read More about Compression-after-impact (CAI) performance of epoxycarbon fibre-reinforced nanocomposites using nanosilica and rubber particle enhancement..

A review on the effect of mechanical drilling on polymer nanocomposites. (2014)
Journal Article
STAROST, K. and NJUGUNA, J. 2014. A review on the effect of mechanical drilling on polymer nanocomposites. IOP conference series: materials science and engineering [online], 64(1), Article 012031. Available from: https://doi.org/10.1088/1757-899X/64/1/012031

Over the past decade, polymer nanocomposites have undergone intensive research and development ensued by its increasing implementation within commercial applications. Consequently, the full life-cycle performance and any health risks associated with... Read More about A review on the effect of mechanical drilling on polymer nanocomposites..

Characterization of synthesized polyurethane/montmorillonite nanocomposites foams. (2014)
Presentation / Conference Contribution
ANSARI, F., SACHSE, S., MICHALOWSKI, S., KAVOSH, M., PIELICHOWSKI, K. and NJUGUNA, J. 2014. Characterization of synthesized polyurethane/montmorillonite nanocomposite foams. IOP conference series: materials science and engineering [online], 64(1), Article 012039. Available from: https://doi.org/10.1088/1757-899X/64/1/012039

Nanophased hybrid composites based on polyurethane/montmorillonite (PU/MMT) have been fabricated. The nanocomposite which was formed by the addition of a polyol premix with 4,4′-diphenylmethane diisocyanate to obtain nanophased polyurethane foams whi... Read More about Characterization of synthesized polyurethane/montmorillonite nanocomposites foams..

Waste to want: polymer nanocomposites using nanoclays extracted from oil based drilling mud waste. (2014)
Journal Article
ADEGBOTOLU, U.V., NJUGUNA, J., POLLARD, P. and YATES, K. 2014. Waste to want: polymer nanocomposites using nanoclays extracted from oil based drilling mud waste. IOP conference series: materials science and engineering [online], 64, Article 012023. Available from: https://doi.org/10.1088/1757-899X/64/1/012023

Due to the European Union (EU) waste frame work directive (WFD), legislations have been endorsed in EU member states such as UK for the Recycling of wastes with a vision to prevent and reduce landfilling of waste. Spent oil based drilling mud (drilli... Read More about Waste to want: polymer nanocomposites using nanoclays extracted from oil based drilling mud waste..

Mechanical and impact performance of three-phase polyamide 6 nanocomposites. (2014)
Journal Article
GENDRE, L., NJUGUNA, J., ABHYANKAR, H. and ERMINI, V. 2015. Mechanical and impact performance of three-phase polyamide 6 nanocomposites. Materials and design [online], 66(Part B), pages 486-491. Available from: https://doi.org/10.1016/j.matdes.2014.08.005

In this work, three-phase nanocomposites using multiscale reinforcements were studied to evaluate the influence of nanofillers on static and dynamic mechanical properties at varying temperature conditions. In particular, short-fibres reinforced polya... Read More about Mechanical and impact performance of three-phase polyamide 6 nanocomposites..

Thermo-mechanical performance of poly(lactic acid)/flax fibre-reinforced biocomposites. (2014)
Journal Article
NASSIOPOULOS, E. and NJUGUNA, J. 2015. Thermo-mechanical performance of poly(lactic acid)/flax fibre-reinforced biocomposites. Materials and design [online], 66(Part B), pages 473-485. Available from: https://doi.org/10.1016/j.matdes.2014.07.051

In this study, the thermo-mechanical performance of flax fibre reinforced poly lactic acid (PLA) biocomposites was investigated for the potential use in load bearing application such as body-in-white and body structures in the automotive sector. Focu... Read More about Thermo-mechanical performance of poly(lactic acid)/flax fibre-reinforced biocomposites..

Abstract book for the proceedings of the 2nd International conference on structural nano composites (NANOSTRUC 2014), 20-21 May 2014, Madrid, Spain. (2014)
Presentation / Conference Contribution
NJUGUNA, J., STAROST, K. and VERDEJO, R. (eds.) 2014. Abstract book for the proceedings of the 2nd International conference on structural nano composites (NANOSTRUC 2014), 20-21 May 2014, Madrid, Spain.

The purpose of the 2nd International Conference on Structural Nano Composites (NANOSTRUC 2014) is to promote activities in various areas of materials and structures by providing a forum for exchange of ideas, presentation of technical achievements an... Read More about Abstract book for the proceedings of the 2nd International conference on structural nano composites (NANOSTRUC 2014), 20-21 May 2014, Madrid, Spain..

The effect of matrix and reinforcement material selection on the tensile properties of hybrid composites. (2014)
Journal Article
SILVA, F., SACHSE, S., ZHU, H., PIELICHOWSKI, K., LESZCZYNSKA, A. and NJUGUNA, J. 2014. The effect of matrix and reinforcement material selection on the tensile properties of hybrid composites. Journal of sustainable mobility, 1(1), pages 37-52. Available from: https://doi.org/10.9774/GLEAF.2350.2014.00005

In order to develop advanced materials as lightweight structures three-phased composites were prepared using nano-fillers, nano-silica (nano-SiO2) and nano-clay and micro glass-spheres to reinforce two kinds of glass-fibre reinforced thermoplastic ma... Read More about The effect of matrix and reinforcement material selection on the tensile properties of hybrid composites..

Cost modelling to support optimised selection of the end of life options for automotive components. (2014)
Journal Article
XU, Y., SANCHEZ, J.F. and NJUGUNA, J. 2014. Cost modelling to support optimised selection of the end of life options for automotive components. International journal of advanced manufacturing technology [online], 73(1-4), pages 399-407. Available from: https://doi.org/10.1007/s00170-014-5804-9

In automotive sector, the End-of-Life components, especially the uni-material components e.g. steel, plastics etc., traditionally normally go to material recycling. However, this conventional disposing approach has nowadays moved towards the secondar... Read More about Cost modelling to support optimised selection of the end of life options for automotive components..

Effect of nanofillers on low energy impact performance of sandwich structures with nanoreinforced polyurethane foam cores. (2014)
Journal Article
SACHSE, S., PORURI, M., SILVA, F., MICHALOWSKI, S., PIELICHOWSKI, K. and NJUGUNA, J. 2014. Effect of nanofillers on low energy impact performance of sandwich structures with nanoreinforced polyurethane foam cores. Journal of sandwich structures and materials [online], 16(2), pages 173-194. Available from: https://doi.org/10.1177/1099636213512497

Sandwich panels were fabricated with nanoclay-filled polyurethane foams and glass fiber-reinforced polyamide and polypropylenes face sheets. Nanoclay-filled foam cores, with organophilic montmorillonite loadings of 0-10 wt%, were synthesized through... Read More about Effect of nanofillers on low energy impact performance of sandwich structures with nanoreinforced polyurethane foam cores..

Assessment of temporal dose-toxicity relationship of fumed silica nanoparticle in human lung A549 cells by conventional cytotoxicity and 1H-NMR-based extracellular metabonomic assays. (2014)
Journal Article
IRFAN, A., CAUCHI, M., EDMANDS, W., GOODERHAM, N. J., NJUGUNA, J. and ZHU, H. 2014. Assessment of temporal dose-toxicity relationship of fumed silica nanoparticle in human lung A549 cells by conventional cytotoxicity and 1H-NMR-based extracellular metabonomic assays. Toxicological sciences [online], 138 (2), pages 354-364. Available from: https://doi.org/10.1093/toxsci/kfu009

As nanoparticles could form aggregates in biological systems, the dynamics of their dispersity drives the temporal effect of nanoparticles in vitro. To test this hypothesis, the fumed silica nanoparticles (SiNPs) that have primary sizes of 7-14 nm an... Read More about Assessment of temporal dose-toxicity relationship of fumed silica nanoparticle in human lung A549 cells by conventional cytotoxicity and 1H-NMR-based extracellular metabonomic assays..

Recent development of flax fibres and their reinforced composites based on different polymeric matrices. (2013)
Journal Article
ZHU, J., ZHU, H., NJUGUNA, J. and ABHYANKAR, H., 2013. Recent development of flax fibres and their reinforced composites based on different polymeric matrices. Materials [online], 6(11), pages 5171-5198. Available from: https://doi.org/10.3390/ma6115171

This work describes flax fibre reinforced polymeric composites with recent developments. The properties of flax fibres, as well as advanced fibre treatments such as mercerization, silane treatment, acylation, peroxide treatment and coatings for the e... Read More about Recent development of flax fibres and their reinforced composites based on different polymeric matrices..

Effect of fibre configurations on mechanical properties of flax/tannin composites. (2013)
Journal Article
ZHU, J., NJUGUNA, J., ABHYANKAR, H., ZHU, H., PERREUX, D., THIEBAUD, F., CHAPELLE, D., PIZZI, A., SAUGET, A., DE LARMINAT, A. and NICOLLIN, A. 2013. Effect of fibre configurations on mechanical properties of flax/tannin composites. Industrial crops and products [online], 50, pages 68-76. Available from: https://doi.org/10.1016/j.indcrop.2013.06.033

Flax reinforced tannin-based composites have a potential to be used in vehicle applications due to the environmental advantages and good mechanical properties. In this paper, the effects of fibre configuration on mechanical properties of flax/tannin... Read More about Effect of fibre configurations on mechanical properties of flax/tannin composites..

An experimental investigation into localised low-velocity impact loading on glass fibre-reinforced polyamide automotive product. (2013)
Journal Article
MOUTI, Z., WESTWOOD, K., LONG, D. and NJUGUNA, J. 2013. An experimental investigation into localised low-velocity impact loading on glass fibre-reinforced polyamide automotive product. Composite structures [online], 104, pages 43-53. Available from: https://doi.org/10.1016/j.compstruct.2013.03.014

In the automotive industry, more and more engineered parts are shifting from metals to engineering plastics. However localised impact loading and long term ageing effects of under-the-hood plastic components is not well understood. In this paper, loc... Read More about An experimental investigation into localised low-velocity impact loading on glass fibre-reinforced polyamide automotive product..

Energy absorption characteristics of nano-composite conical structures. (2012)
Presentation / Conference Contribution
SILVA, F., SACHSE, S. and NJUGUNA, J. 2012. Energy absorption characteristics of nano-composite conical structures. IOP conference series: materials science and engineering [online], 40(1): proceedings of 2012 international conference on Structural nano composites (NANOSTRUC 2012), 2-4 July 2012, Cranfield, UK, article 012010. Available from: https://doi.org/10.1088/1757-899X/40/1/012010

The effect of the filler material on the energy absorption capabilities of polyamide 6 composite structures is studied in details in the present paper. The axial dynamic and quasi-static collapse of conical structures was conducted using a high energ... Read More about Energy absorption characteristics of nano-composite conical structures..

Physical characteristics of nanoparticles emitted during drilling of silica based polyamide 6 nanocomposites. (2012)
Presentation / Conference Contribution
SACHSE, S., SILVA, F., IRFAN, A., ZHU, H., PIELICHOWSKI, K., LESZCZYNSKA, A., BLAZQUEZ, M., KAZMINA, O., KUZMENKO, O. and NJUGUNA, J. 2012. Physical characteristics of nanoparticles emitted during drilling of silica based polyamide 6 nanocomposites. IOP conference series: materials science and engineering [online], 40(1): proceedings of 2012 international conference on Structural nano composites (NANOSTRUC 2012), 2-4 July 2012, Cranfield, UK, article 012012. Available from: https://doi.org/10.1088/1757-899X/40/1/012012

During the past decade, polymer nanocomposites have emerged as a novel and rapidly developing class of materials and attracted considerable investment in research and development worldwide. However, there is currently a lack of information available... Read More about Physical characteristics of nanoparticles emitted during drilling of silica based polyamide 6 nanocomposites..

Assessment of nanoparticle release and associated health effect of polymer-silicon composites. (2012)
Presentation / Conference Contribution
ZHU, H., IRFAN, A., SACHSE, S. and NJUGUNA, J. 2012. Assessment of nanoparticle release and associated health effect of polymer-silicon composites. IOP conference series: materials science and engineering [online], 40(1): proceedings of 2012 international conference on Structural nano composites (NANOSTRUC 2012), 2-4 July 2012, Cranfield, UK, article 012015. Available from: https://doi.org/10.1088/1757-899X/40/1/012015

Little information is currently available on possible release of nanomaterials or/and nanoparticles (NP) from conventional and novel products and associated health effect. This study aimed to assess the possible release of NP during the application s... Read More about Assessment of nanoparticle release and associated health effect of polymer-silicon composites..

Enhancement of thermal conductivity of materials using different forms of natural graphite. (2012)
Presentation / Conference Contribution
DESAI, S. and NJUGUNA, J. 2012. Enhancement of thermal conductivity of materials using different forms of natural graphite. IOP conference series: materials science and engineering [online], 40(1): proceedings of 2012 international conference on Structural nano composites (NANOSTRUC 2012), 2-4 July 2012, Cranfield, UK, article 012017. Available from: https://doi.org/10.1088/1757-899X/40/1/012017

The quest for improvement of thermal conductivity in every area including aerospace structures is gaining momentum as the modern day technology is embedded with electronics which generate considerable amounts of heat energy. In some other application... Read More about Enhancement of thermal conductivity of materials using different forms of natural graphite..

Tannin-based flax fibre reinforced composites for structural applications in vehicles. (2012)
Presentation / Conference Contribution
ZHU, J., ABHYANKAR, H., NASSIOPOULOS, E. and NJUGUNA, J. 2012. Tannin-based flax fibre reinforced composites for structural applications in vehicles. IOP conference series: materials science and engineering [online], 40(1): proceedings of 2012 international conference on Structural nano composites (NANOSTRUC 2012), 2-4 July 2012, Cranfield, UK, article 012030. Available from: https://doi.org/10.1088/1757-899X/40/1/012030

Innovation is often driven by changes in government policies regulating the industries, especially true in case of the automotive. Except weight savings, the strict EU regulation of 95% recyclable material-made vehicles drives the manufactures and sc... Read More about Tannin-based flax fibre reinforced composites for structural applications in vehicles..

Potential of silicon nanowires structures as nanoscale piezoresistors in mechanical sensors. (2012)
Presentation / Conference Contribution
MESSINA, M. and NJUGUNA, J. 2012. Potential of silicon nanowires structures as nanoscale piezoresistors in mechanical sensors. IOP conference series: materials science and engineering [online], 40(1): proceedings of 2012 international conference on Structural nano composites (NANOSTRUC 2012), 2-4 July 2012, Cranfield, UK, article 012038. Available from: https://doi.org/10.1088/1757-899X/40/1/012038

This paper presents the design of a single square millimeter 3-axial accelerometer for bio-mechanics measurements that exploit the potential of silicon nanowires structures as nanoscale piezoresistors. The main requirements of this application are mi... Read More about Potential of silicon nanowires structures as nanoscale piezoresistors in mechanical sensors..

Mechanical performance of foam glass with nanoscale structure elements. (2012)
Presentation / Conference Contribution
KAZMINA, O.V., SEMUKHIN, B.S. and NJUGUNA, J. 2012. Mechanical performance of foam glass with nanoscale structure elements. IOP conference series: materials science and engineering, 40(1): proceedings of 2012 international conference on Structural nano composites (NANOSTRUCT 2012), 2-4 July 2012, Cranfield, UK, Article 012042. Available from: https://doi.org/10.1088/1757-899X/40/1/012042

The paper presents experimental data on studying the strengthening of glass foam material. Glass foam material is foamed glass of increased strength achieved due to nanoscale structural elements. Glass foam is obtained through thermal treatment of no... Read More about Mechanical performance of foam glass with nanoscale structure elements..

Abstract book for the proceedings of the 1st International conference on structural nano composites (NANOSTRUC 2012), 02-04 July 2012, Cranfield, UK. (2012)
Presentation / Conference Contribution
SACHSE, S. and NJUGUNA, J. (eds.) 2012. Abstract book for the proceedings of the 1st International conference on structural nano composites (NANOSTRUC 2012), 02-04 July 2012, Cranfield, UK.

The purpose of the 2012 International Conference on Structural Nano Composites (NanoStruc 2012) is to promote activities in various areas of materials and structures by providing a forum for exchange of ideas, presentation of technical achievements a... Read More about Abstract book for the proceedings of the 1st International conference on structural nano composites (NANOSTRUC 2012), 02-04 July 2012, Cranfield, UK..

The effect of nanoclay on dust generation during drilling of PA6 nanocomposites. (2012)
Journal Article
SACHSE, S., SILVA, F., ZHU, H., IRFAN, A., LESZCZYŃSKA, A., PIELICHOWSKI, K., ERMINI, V., BLAZQUEZ, M., KUZMENKO, O. and NJUGUNA, J. 2012. The effect of nanoclay on dust generation during drilling of PA6 nanocomposites. Journal of nanomaterials [online], 2012, article ID 189386. Available from: https://doi.org/10.1155/2012/189386

During the past decade, polymer nanocomposites have emerged as a novel and rapidly developing class of materials and attracted considerable investment in research and development worldwide. However, there is currently a lack of information available... Read More about The effect of nanoclay on dust generation during drilling of PA6 nanocomposites..

Natural fibers, bio- and nanocomposites. (2011)
Journal Article
KALIA, S., AVÉROUS, L., NJUGUNA, J., DUNFRESNE, A. and CHERIAN, B.M. 2011. Natural fibers, bio- and nanocomposites. International journal of polymer science [online], 2011: natural fibers, bio- and nanocomposites, article 735932. Available from: https://doi.org/10.1155/2011/735932

This is an editorial article in which the authors discuss natural fibers and nanocomposites and give a brief introduction to the papers in this special issue.

Cellulose-Based Bio- and Nanocomposites: A Review (2011)
Journal Article
KALIA, S., DUFRESNE, A., CHERIAN, B.M., KAITH, B.S., AVÉROUS, L., NJUGUNA, J. and NASSIOPOULOS, E. 2011. Cellulose-based bio- and nanocomposites: a review. International journal of polymer science [online], 2011: natural fibers, bio- and nanocomposites, article 837875. Available from: https://doi.org/10.1155/2011/837875

Cellulose macro- and nanofibers have gained increasing attention due to the high strength and stiffness, biodegradability and renewability, and their production and application in development of composites. Application of cellulose nanofibers for the... Read More about Cellulose-Based Bio- and Nanocomposites: A Review.

Low velocity impact behavior of glass filled fiber-reinforced thermoplastic engine components. (2010)
Journal Article
MOUTI, Z., WESTWOOD, K., KAYVANTASH, K. and NJUGUNA, J. 2010. Low velocity impact behavior of glass filled fiber-reinforced thermoplastic engine components. Materials [online], 3(4), pages 2463-2473. Available from: https://doi.org/10.3390/ma3042463

This paper concerns automotive parts located underneath the engine and in particular the engine oil pan. Classically made of stamped steel or cast aluminum, new developments have allowed the manufacture oil pans with polyamide 66 reinforced by 35% we... Read More about Low velocity impact behavior of glass filled fiber-reinforced thermoplastic engine components..

Insulating polymer nanocomposites for high thermal conduction and fire retarding applications.
Presentation / Conference Contribution
GUPTA, R., HUO, D., PANCHOLI, M., NJUGUNA, J. and PANCHOLI, K. 2017. Insulating polymer nanocomposites for high thermal conduction and fire retarding applications. Presented at the 3rd Defence and security doctoral symposium, 14-15 November 2017, Swindon, UK [online]. Available from: https://doi.org/10.17862/cranfield.rd.5675281.v1

The possibility of combining the flexibility and light - weight of polymers with the highest insulation of ceramics, drives the field of nanocomposites for potential commercial application. The inclusion of nano-sized insulating particles in the poly... Read More about Insulating polymer nanocomposites for high thermal conduction and fire retarding applications..

Computational analysis and optimization of a MEMS-based piezoresistive accelerometer for head injuries monitoring.
Presentation / Conference Contribution
MESSINA, M., NJUGUNA, J. and PALAS, C. 2017. Computational analysis and optimization of a MEMS-based piezoresistive accelerometer for head injuries monitoring. Presented at the 2017 IEEE sensors conference, 29 October - 1 November 2017, Glasgow, UK.

This work focuses on the design improvement of a tri-axial piezoresistive accelerometer specifically designed for head injuries monitoring where medium-G impacts are common, for example in sports such as racing cars. The device requires the highest s... Read More about Computational analysis and optimization of a MEMS-based piezoresistive accelerometer for head injuries monitoring..

Characterisation of oil based mud waste to explore the possibility in transforming waste into a value added product.
Presentation / Conference Contribution
SIDDIQUE, S., YATES, K. and NJUGUNA, J. 2018. Characterisation of oil based mud waste to explore the possibility in transforming waste into a value added product. Presented at the 6th International conference on sustainable solid waste management (NAXOS 2018), 13-16 June 2018, Naxos, Greece. Athens: National Technical University of Athens [online], paper number 45. Available from: http://uest.ntua.gr/naxos2018/proceedings/pdf/45_NAXOS2018_Siddique_etal.pdf

Waste characterisation is an essential factor in designing sustainable waste management plan. However, waste composition profile is underestimated in oil and gas exploration and production (E&P) industries in the United Kingdom. A three years long in... Read More about Characterisation of oil based mud waste to explore the possibility in transforming waste into a value added product..

Thermal stability, flame retardancy and mechanical properties of polyamide/montmorillonite nanocomposites prepared by melt processing.
Presentation / Conference Contribution
SIDDIQUE, S., YATES, K. and NJUGUNA, J. 2016. Thermal stability, flame retardancy and mechanical properties of polyamide/montmorillonite nanocomposites prepared by melt processing. Presented at the 3rd International conference on structural nano composites (NANOSTRUC 2016), 12-16 September 2016, Aberdeen, UK.

The increase in thermal stability, flame retardancy, and mechanical properties of Polyamide 6 (PA6)/montmorillonite (MMT) nanocomposites open a new research window in respect to successful technical application of PA6/MMT nanocomposites on the indust... Read More about Thermal stability, flame retardancy and mechanical properties of polyamide/montmorillonite nanocomposites prepared by melt processing..

Mechanical, thermal, and flammability behaviour of low density polyethylene - oil based mud fillers nanocomposites.
Presentation / Conference Contribution
SIDDIQUE, S., SMITH, G.D., YATES, K. and NJUGUNA, J. 2018. Mechanical, thermal, and flammability behaviour of low density polyethylene - oil based mud fillers nanocomposites. Presented at the 4th International conference on structural nano composites (NANOSTRUC 2018), 23-24 May 2018, Berlin, Germany.

Novel low density polyethylene (LDPE)/Oil based mud fillers (OBMF) nanocomposites were manufactured by a melt compounding process. Fourier Transform Infrared (FTIR) Spectroscopy was used to characterise the structure of the nanocomposites. The result... Read More about Mechanical, thermal, and flammability behaviour of low density polyethylene - oil based mud fillers nanocomposites..

Structural flax/PLA biocomposites: understanding of their thermo-mechanical behaviour.
Presentation / Conference Contribution
NASSIOPOULOS, E., ABHYANKAR, H. and NJUGUNA, J. 2013. Structural flax/PLA biocomposites: understanding of their thermo-mechanical behaviour. Presented at the 21st annual international conference on composites/nano engineering (ICCE-NANO 21), 21-27 July 2013, Tenerife, Spain.

The extended use of bio-composites for the manufacturing of vehicle components would largely benefit the industry. However, the properties of biocomposites, their mechanical performance under different environments and the effect of different loading... Read More about Structural flax/PLA biocomposites: understanding of their thermo-mechanical behaviour..

Case study: multi-billion pound infrastructure decision making: a regulatory infrastructure asset management assessment.
Report
BRUINERS, J., NJUGUNA, J. and AGARWAL, A. 2022. Case study: multi-billion pound infrastructure decision making: a regulatory infrastructure asset management assessment. Hosted on OpenAIR [online]. Available from: https://rgu-repository.worktribe.com/output/1777830

This paper evaluates the effectiveness of a hypothesised asset management decision framework implemented with a High-Speed Railway Infrastructure Asset in the U.K over a three-year period. The physical infrastructure asset(s) consists of a complex as... Read More about Case study: multi-billion pound infrastructure decision making: a regulatory infrastructure asset management assessment..

An evaluation of the morphological, microstructural and mechanical behaviour of the glass fibre/HDPE thermoplastic composite pipe.
Presentation / Conference Contribution
OKOLIE, O., NJUGUNA, J. and FAISAL, N. 2022. An evaluation of the morphological, microstructural and mechanical behaviour of the glass fibre/HDPE thermoplastic composite pipe. Presented at 2022 Scottish Research Partnership in Engineering 2022, 21 November 2022, Edinburgh, UK.

Composite pipes are increasingly being used as an alternative solution to conventional metal-based pipes. This development is in response to significant corrosion failures with the metallic pipes and enables better decision making especially for the... Read More about An evaluation of the morphological, microstructural and mechanical behaviour of the glass fibre/HDPE thermoplastic composite pipe..

Developing a hydrogen car demonstration for the actual public: public perceptions/experience.
Presentation / Conference Contribution
MENYEH, B., OLADIGBO, T., OBUROH, A., FAISAL, N. and NJUGUNA, J. 2024. Developing a hydrogen car demonstration for the actual public: public perceptions/experience. Presented at 2024 Hydrogen accelerator meeting and networking event, 22 March 2024, Edinburgh, UK.

The project titled "Consumer Perceptions Toward Hydrogen Fuel Cell Vehicles: A Demonstrator Project" aims to enhance public awareness and assess consumer responses to hydrogen fuel cell vehicles through a real-world driving experience. The project in... Read More about Developing a hydrogen car demonstration for the actual public: public perceptions/experience..