All Outputs (85)

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..

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..

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..

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..

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..