Tribotronic control of an ionic boundary layer in operando extends the limits of lubrication
Abstract The effect of electric potential on the lubrication of a non-halogenated phosphonium orthoborate ionic liquid used as an additive in a biodegradable oil was studied. An in-house tribotronic system was built around an instrument designed to measure lubricant film thickness between a rolling...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2022-11-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-22504-6 |
| _version_ | 1797985550138867712 |
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| author | Akepati Bhaskar Reddy Georgia A. Pilkington Mark W. Rutland Sergei Glavatskih |
| author_facet | Akepati Bhaskar Reddy Georgia A. Pilkington Mark W. Rutland Sergei Glavatskih |
| author_sort | Akepati Bhaskar Reddy |
| collection | DOAJ |
| description | Abstract The effect of electric potential on the lubrication of a non-halogenated phosphonium orthoborate ionic liquid used as an additive in a biodegradable oil was studied. An in-house tribotronic system was built around an instrument designed to measure lubricant film thickness between a rolling steel ball and a rotating silica-coated glass disc. The application of an electric field between the steel ball and a set of customized counter-electrodes clearly induced changes in the thickness of the lubricant film: a marked decrease at negative potentials and an increase at positive potentials. Complementary neutron reflectivity studies demonstrated the intrinsic electroresponsivity of the adsorbate: this was performed on a gold-coated silicon block and made possible in the same lubricant system by deuterating the oil. The results indicate that the anions, acting as anchors for the adsorbed film on the steel surface, are instrumental in the formation of thick and robust lubricating ionic boundary films. The application of a high positive potential, outside the electrochemical window, resulted in an enormous boost to film thickness, implicating the formation of ionic multi-layers and demonstrating the plausibility of remote control of failing contacts in inaccessible machinery, such as offshore wind and wave power installations. |
| first_indexed | 2024-04-11T07:19:53Z |
| format | Article |
| id | doaj.art-680d779579234f0a83ca9f39c8723d07 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-11T07:19:53Z |
| publishDate | 2022-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-680d779579234f0a83ca9f39c8723d072022-12-22T04:37:48ZengNature PortfolioScientific Reports2045-23222022-11-0112111010.1038/s41598-022-22504-6Tribotronic control of an ionic boundary layer in operando extends the limits of lubricationAkepati Bhaskar Reddy0Georgia A. Pilkington1Mark W. Rutland2Sergei Glavatskih3System and Component Design, Department of Machine Design, KTH Royal Institute of TechnologyDivision of Surface Chemistry and Corrosion Science, Department of Chemistry, KTH Royal Institute of TechnologyDivision of Surface Chemistry and Corrosion Science, Department of Chemistry, KTH Royal Institute of TechnologySystem and Component Design, Department of Machine Design, KTH Royal Institute of TechnologyAbstract The effect of electric potential on the lubrication of a non-halogenated phosphonium orthoborate ionic liquid used as an additive in a biodegradable oil was studied. An in-house tribotronic system was built around an instrument designed to measure lubricant film thickness between a rolling steel ball and a rotating silica-coated glass disc. The application of an electric field between the steel ball and a set of customized counter-electrodes clearly induced changes in the thickness of the lubricant film: a marked decrease at negative potentials and an increase at positive potentials. Complementary neutron reflectivity studies demonstrated the intrinsic electroresponsivity of the adsorbate: this was performed on a gold-coated silicon block and made possible in the same lubricant system by deuterating the oil. The results indicate that the anions, acting as anchors for the adsorbed film on the steel surface, are instrumental in the formation of thick and robust lubricating ionic boundary films. The application of a high positive potential, outside the electrochemical window, resulted in an enormous boost to film thickness, implicating the formation of ionic multi-layers and demonstrating the plausibility of remote control of failing contacts in inaccessible machinery, such as offshore wind and wave power installations.https://doi.org/10.1038/s41598-022-22504-6 |
| spellingShingle | Akepati Bhaskar Reddy Georgia A. Pilkington Mark W. Rutland Sergei Glavatskih Tribotronic control of an ionic boundary layer in operando extends the limits of lubrication Scientific Reports |
| title | Tribotronic control of an ionic boundary layer in operando extends the limits of lubrication |
| title_full | Tribotronic control of an ionic boundary layer in operando extends the limits of lubrication |
| title_fullStr | Tribotronic control of an ionic boundary layer in operando extends the limits of lubrication |
| title_full_unstemmed | Tribotronic control of an ionic boundary layer in operando extends the limits of lubrication |
| title_short | Tribotronic control of an ionic boundary layer in operando extends the limits of lubrication |
| title_sort | tribotronic control of an ionic boundary layer in operando extends the limits of lubrication |
| url | https://doi.org/10.1038/s41598-022-22504-6 |
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