Molecular behaviors in thin film lubrication—Part two: Direct observation of the molecular orientation near the solid surface
Abstract Over the past twenty years, thin film lubrication (TFL) theory has been used to characterize the molecular behaviors in lubrication films thinner than 100 nm, effectively bridging the gap between elastohydrodynamic lubrication and boundary lubrication. Unfortunately, to date, the TFL molecu...
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2019-06-01
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| Series: | Friction |
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| Online Access: | http://link.springer.com/article/10.1007/s40544-019-0279-1 |
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| _version_ | 1849323420266790912 |
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| author | Ming Gao Haoyu Li Liran Ma Yuan Gao Linwei Ma Jianbin Luo |
| author_facet | Ming Gao Haoyu Li Liran Ma Yuan Gao Linwei Ma Jianbin Luo |
| author_sort | Ming Gao |
| collection | DOAJ |
| description | Abstract Over the past twenty years, thin film lubrication (TFL) theory has been used to characterize the molecular behaviors in lubrication films thinner than 100 nm, effectively bridging the gap between elastohydrodynamic lubrication and boundary lubrication. Unfortunately, to date, the TFL molecular model proposed in 1996 has not been directly proven by experimental detection. Herein, a method based on surface-enhanced Raman spectroscopy was developed to show both the packing and orienting of liquid molecules in the TFL regime. By trapping liquid crystal molecules between a structured silver surface and a glass surface, molecular ordering states dominated by shear effect and surface effect were successfully distinguished. A nanosandwich structure consisting of an adsorbed layer, an ordered-molecule layer, and a fluid layer was demonstrated. Molecule imaging in TFL was achieved. Our results illustrate the molecular behaviors and lubrication mechanism in nanoconfined films and facilitate the lubrication design of nanoelectromechanical and microelectromechanical systems. |
| format | Article |
| id | doaj-art-948a201ebac34aa995e82c8ddf4d7d0b |
| institution | Kabale University |
| issn | 2223-7690 2223-7704 |
| language | English |
| publishDate | 2019-06-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Friction |
| spelling | doaj-art-948a201ebac34aa995e82c8ddf4d7d0b2025-08-20T03:49:03ZengTsinghua University PressFriction2223-76902223-77042019-06-017547948810.1007/s40544-019-0279-1Molecular behaviors in thin film lubrication—Part two: Direct observation of the molecular orientation near the solid surfaceMing Gao0Haoyu Li1Liran Ma2Yuan Gao3Linwei Ma4Jianbin Luo5State Key Laboratory of Tribology, Tsinghua UniversityState Key Laboratory of Tribology, Tsinghua UniversityState Key Laboratory of Tribology, Tsinghua UniversityState Key Laboratory of Tribology, Tsinghua UniversitySchool of Materials Science and Engineering, Tsinghua UniversityState Key Laboratory of Tribology, Tsinghua UniversityAbstract Over the past twenty years, thin film lubrication (TFL) theory has been used to characterize the molecular behaviors in lubrication films thinner than 100 nm, effectively bridging the gap between elastohydrodynamic lubrication and boundary lubrication. Unfortunately, to date, the TFL molecular model proposed in 1996 has not been directly proven by experimental detection. Herein, a method based on surface-enhanced Raman spectroscopy was developed to show both the packing and orienting of liquid molecules in the TFL regime. By trapping liquid crystal molecules between a structured silver surface and a glass surface, molecular ordering states dominated by shear effect and surface effect were successfully distinguished. A nanosandwich structure consisting of an adsorbed layer, an ordered-molecule layer, and a fluid layer was demonstrated. Molecule imaging in TFL was achieved. Our results illustrate the molecular behaviors and lubrication mechanism in nanoconfined films and facilitate the lubrication design of nanoelectromechanical and microelectromechanical systems.http://link.springer.com/article/10.1007/s40544-019-0279-1thin film lubricationmolecular behaviorsnematic liquid crystalsurface-enhanced Raman spectroscopylubrication theorynanosandwich structure |
| spellingShingle | Ming Gao Haoyu Li Liran Ma Yuan Gao Linwei Ma Jianbin Luo Molecular behaviors in thin film lubrication—Part two: Direct observation of the molecular orientation near the solid surface Friction thin film lubrication molecular behaviors nematic liquid crystal surface-enhanced Raman spectroscopy lubrication theory nanosandwich structure |
| title | Molecular behaviors in thin film lubrication—Part two: Direct observation of the molecular orientation near the solid surface |
| title_full | Molecular behaviors in thin film lubrication—Part two: Direct observation of the molecular orientation near the solid surface |
| title_fullStr | Molecular behaviors in thin film lubrication—Part two: Direct observation of the molecular orientation near the solid surface |
| title_full_unstemmed | Molecular behaviors in thin film lubrication—Part two: Direct observation of the molecular orientation near the solid surface |
| title_short | Molecular behaviors in thin film lubrication—Part two: Direct observation of the molecular orientation near the solid surface |
| title_sort | molecular behaviors in thin film lubrication part two direct observation of the molecular orientation near the solid surface |
| topic | thin film lubrication molecular behaviors nematic liquid crystal surface-enhanced Raman spectroscopy lubrication theory nanosandwich structure |
| url | http://link.springer.com/article/10.1007/s40544-019-0279-1 |
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