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 vegetable-oil-based lubricants, namely oleic acid, methyl oleate, and trimethylolpro...
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| Format: | Article |
| Language: | English |
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Malaysian Tribology Society (Mytribos)
2022
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| Online Access: | http://eprints.utm.my/102708/1/LeeChiewTin2022_NanoFrictionalInvestigationonBoundaryLubricity.pdf |
| _version_ | 1796867316960460800 |
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| author | Lee, Chiew Tin Lee, Mei Bao Chong, William Woei Fong Samion, Syahrullail |
| author_facet | Lee, Chiew Tin Lee, Mei Bao Chong, William Woei Fong Samion, Syahrullail |
| author_sort | Lee, Chiew Tin |
| collection | ePrints |
| description | 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 vegetable-oil-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 film can be formed and sustained under higher shear rates. |
| first_indexed | 2024-03-05T21:25:25Z |
| format | Article |
| id | utm.eprints-102708 |
| institution | Universiti Teknologi Malaysia - ePrints |
| language | English |
| last_indexed | 2024-03-05T21:25:25Z |
| publishDate | 2022 |
| publisher | Malaysian Tribology Society (Mytribos) |
| record_format | dspace |
| spelling | utm.eprints-1027082023-09-18T04:10:16Z http://eprints.utm.my/102708/ Nano-frictional investigation on boundary lubricity of oleic acid, methyl oleate and trimethylolpropane trioleate Lee, Chiew Tin Lee, Mei Bao Chong, William Woei Fong Samion, Syahrullail TJ Mechanical engineering and machinery 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 vegetable-oil-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 film can be formed and sustained under higher shear rates. Malaysian Tribology Society (Mytribos) 2022-03 Article PeerReviewed application/pdf en http://eprints.utm.my/102708/1/LeeChiewTin2022_NanoFrictionalInvestigationonBoundaryLubricity.pdf Lee, Chiew Tin and Lee, Mei Bao and Chong, William Woei Fong and Samion, Syahrullail (2022) Nano-frictional investigation on boundary lubricity of oleic acid, methyl oleate and trimethylolpropane trioleate. Jurnal Tribologi, 32 (NA). pp. 1-15. ISSN 2289-7232 https://jurnaltribologi.mytribos.org/v32/JT-32-1-15.pdf NA |
| spellingShingle | TJ Mechanical engineering and machinery Lee, Chiew Tin Lee, Mei Bao Chong, William Woei Fong Samion, Syahrullail Nano-frictional investigation on boundary lubricity of oleic acid, methyl oleate and trimethylolpropane trioleate |
| title | Nano-frictional investigation on boundary lubricity of oleic acid, methyl oleate and trimethylolpropane trioleate |
| title_full | Nano-frictional investigation on boundary lubricity of oleic acid, methyl oleate and trimethylolpropane trioleate |
| title_fullStr | Nano-frictional investigation on boundary lubricity of oleic acid, methyl oleate and trimethylolpropane trioleate |
| title_full_unstemmed | Nano-frictional investigation on boundary lubricity of oleic acid, methyl oleate and trimethylolpropane trioleate |
| title_short | Nano-frictional investigation on boundary lubricity of oleic acid, methyl oleate and trimethylolpropane trioleate |
| title_sort | nano frictional investigation on boundary lubricity of oleic acid methyl oleate and trimethylolpropane trioleate |
| topic | TJ Mechanical engineering and machinery |
| url | http://eprints.utm.my/102708/1/LeeChiewTin2022_NanoFrictionalInvestigationonBoundaryLubricity.pdf |
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