All Outputs (108)

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)
Conference Proceeding
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..

Characterisation of oil based mud waste to explore the possibility in transforming waste into a value added product. (2018)
Presentation / Conference
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..

Abstract book for the proceedings of the 4th International conference on structural nano composites (NANOSTRUC 2018), 23-24 May 2018, Berlin, Germany. (2018)
Conference Proceeding
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..

Mechanical, thermal, and flammability behaviour of low density polyethylene - oil based mud fillers nanocomposites. (2018)
Presentation / Conference
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..

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..

Insulating polymer nanocomposites for high thermal conduction and fire retarding applications. (2017)
Presentation / Conference
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. (2017)
Conference Proceeding
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..