Effects of modified graphene in high oleic palm oil based methyl ester on friction and wear reduction

This research mainly focuses on the tribological properties of modified graphene in vegetable oil to reduce friction and wear in journal bearing applications. Journal bearings are prone to severe friction and wear effects due to uneven shaft speeds, which affect the performance of the journal bearin...

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Main Author:	Ng, Kean Pin
Format:	Thesis
Published:	2023
Subjects:	TA401-492 Materials of engineering and construction Mechanics of materials
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spelling	my-mmu-ep.128802024-08-29T02:59:21Z Effects of modified graphene in high oleic palm oil based methyl ester on friction and wear reduction 2023-11 Ng, Kean Pin TA401-492 Materials of engineering and construction. Mechanics of materials This research mainly focuses on the tribological properties of modified graphene in vegetable oil to reduce friction and wear in journal bearing applications. Journal bearings are prone to severe friction and wear effects due to uneven shaft speeds, which affect the performance of the journal bearing and its service life. Apart from this, the depletion of mineral oils and environmental concerns have led this research project to propose a new nanofluid lubricant with graphene as a nanoparticle additive and vegetable oil as the base oil. Graphene nanoplatelets (GNP) are chemically surface-modified with sodium dodecyl sulfate (SDS) and oleic acid (OA) to improve their dispersion stability in the base oil fluid, high oleic palm oil based methyl ester (high oleic POME), by increasing their hydrophobicity. The SDS solution is first mixed with the GNP so that the SDS molecules adhere to the GNP surface and the sodium ions (Na+) are exposed in the external environment. After the addition of OA to the mixture, the hydroxyl group (OH-) of OA combines with the Na+ ion of SDS, so that the hydrophobic hydrocarbon chains of OA are exposed to the external environment, resulting in GNPs with better hydrophobicity. The modified GNPs are then used to synthesize modified GNP-oil nanofluids (mGON) at concentrations of 0.05, 0.06, 0.07, 0.08 and 0.09 wt%, while GNP-oil nanofluids (GON) are synthesized at concentrations of 0.02, 0.04, 0.06, 0.08 and 0.10 wt%. The objectives of this work are to study the friction and wear of contact pairs using a pin-on-ring tribo-tester exposed to mGON at different concentrations, and to investigate the thermophysical properties of mGON at different concentrations, including dynamic viscosity and thermal conductivity, which are compared with high oleic POME and GON samples. 2023-11 Thesis https://shdl.mmu.edu.my/12880/ http://erep.mmu.edu.my/ masters Multimedia University Faculty of Engineering and Technology (FET) EREP ID: 12304
institution	Multimedia University
collection	MMU Institutional Repository
topic	TA401-492 Materials of engineering and construction Mechanics of materials
spellingShingle	TA401-492 Materials of engineering and construction Mechanics of materials Ng, Kean Pin Effects of modified graphene in high oleic palm oil based methyl ester on friction and wear reduction
description	This research mainly focuses on the tribological properties of modified graphene in vegetable oil to reduce friction and wear in journal bearing applications. Journal bearings are prone to severe friction and wear effects due to uneven shaft speeds, which affect the performance of the journal bearing and its service life. Apart from this, the depletion of mineral oils and environmental concerns have led this research project to propose a new nanofluid lubricant with graphene as a nanoparticle additive and vegetable oil as the base oil. Graphene nanoplatelets (GNP) are chemically surface-modified with sodium dodecyl sulfate (SDS) and oleic acid (OA) to improve their dispersion stability in the base oil fluid, high oleic palm oil based methyl ester (high oleic POME), by increasing their hydrophobicity. The SDS solution is first mixed with the GNP so that the SDS molecules adhere to the GNP surface and the sodium ions (Na+) are exposed in the external environment. After the addition of OA to the mixture, the hydroxyl group (OH-) of OA combines with the Na+ ion of SDS, so that the hydrophobic hydrocarbon chains of OA are exposed to the external environment, resulting in GNPs with better hydrophobicity. The modified GNPs are then used to synthesize modified GNP-oil nanofluids (mGON) at concentrations of 0.05, 0.06, 0.07, 0.08 and 0.09 wt%, while GNP-oil nanofluids (GON) are synthesized at concentrations of 0.02, 0.04, 0.06, 0.08 and 0.10 wt%. The objectives of this work are to study the friction and wear of contact pairs using a pin-on-ring tribo-tester exposed to mGON at different concentrations, and to investigate the thermophysical properties of mGON at different concentrations, including dynamic viscosity and thermal conductivity, which are compared with high oleic POME and GON samples.
format	Thesis
qualification_level	Master's degree
author	Ng, Kean Pin
author_facet	Ng, Kean Pin
author_sort	Ng, Kean Pin
title	Effects of modified graphene in high oleic palm oil based methyl ester on friction and wear reduction
title_short	Effects of modified graphene in high oleic palm oil based methyl ester on friction and wear reduction
title_full	Effects of modified graphene in high oleic palm oil based methyl ester on friction and wear reduction
title_fullStr	Effects of modified graphene in high oleic palm oil based methyl ester on friction and wear reduction
title_full_unstemmed	Effects of modified graphene in high oleic palm oil based methyl ester on friction and wear reduction
title_sort	effects of modified graphene in high oleic palm oil based methyl ester on friction and wear reduction
granting_institution	Multimedia University
granting_department	Faculty of Engineering and Technology (FET)
publishDate	2023
_version_	1811768015641903104

Effects of modified graphene in high oleic palm oil based methyl ester on friction and wear reduction

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