Nano-frictional investigation on boundary lubricity of oleic acid, methyl oleate and trimethylolpropane trioleate
Vegetable-oil-based lubricant is one of the alternative resources to overcome environmental contamination of unregulated disposal of fossil-fuel-based lubricants. In this study, boundary lubricity of three different vegetableoil-based lubricants, namely oleic acid, methyl oleate, and trimethylol...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | en |
| Published: |
Malaysian Tribology Society
2022
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/45594/1/Nano-frictional%20investigation%20on%20boundary%20lubricity%20of%20oleic%20acid%2C%20methyl%20oleate%20and%20trimethylolpropane%20trioleate.pdf http://ir.unimas.my/id/eprint/45594/ https://jurnaltribologi.mytribos.org/v32.html |
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| Summary: | Vegetable-oil-based lubricant is one of the alternative
resources to overcome environmental contamination of
unregulated disposal of fossil-fuel-based lubricants. In
this study, boundary lubricity of three different vegetableoil-based lubricants, namely oleic acid, methyl oleate, and
trimethylolpropane (TMP) trioleate, are characterised
using Lateral Force Microscopy (LFM) with fluid imaging
under contact mode. Frictional measurements are
conducted using an AFM tip sliding on a stainless-steel
substrate at varied applied normal loads (1-10 nN) and
AFM tip sliding velocities (2–200 µm/s). The obtained
frictional data is further analysed based on Eyring thermal
activation energy approach. The coefficient of friction
(CoF) values for TMP trioleate are the lowest across the
range of sliding velocities, except at 200 µm/s. The
boundary friction properties of methyl oleate are shear
activated, where the measured CoF reduces significantly
with increasing AFM tip sliding velocities. It is also to
highlight that methyl oleate produced the lowest CoF at
200 µm/s among the tested fluids. Such a boundary
lubricity characteristic could be attributed to a more
balanced activation energy property as compared to oleic
acid and TMP trioleate, where a stronger boundary fil |
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