Using a coarse-grained molecular dynamics simulation based on the bead-spring polymer model, we reproduced the film distribution of molecularly thin lubricant films with polar end groups coated on the disk surface and quantified the film surface morphology using a molecular-probe scanning method. We found that the film surface morphology changed periodically with increasing the film thickness. The monolayer of a polar lubricant that entirely covers the solid surface provides a flat lubricant surface by exposing its nonpolar backbone outside of the monolayer. By increasing film thickness, the end beads aggregate to make clusters, and bulges form on the lubricant surface accompanying an increase in surface roughness. The bulges continue to grow up even though the averaged film thickness reaches or exceeds the bilayer thickness. With further increases in film thickness, the clusters start to be uniformly distributed in the lateral direction to clearly form a third layer. As for the formation of fourth-fifth layers, the process is basically the same as that for the second-third layers. Through our calculations of the intermolecular potential field and the intermolecular force field, these values are found to change periodically and are synchronized with the formation of molecule aggregations, which explains the mechanism of forming the layered structure that is inherent to a polar lubricant.
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STLE/ASME 2006 International Joint Tribology Conference
October 23–25, 2006
San Antonio, Texas, USA
Conference Sponsors:
- Tribology Division
ISBN:
0-7918-4259-2
PROCEEDINGS PAPER
Quantification of the Surface Morphology of Lubricant Films With Polar End Groups Using Molecular Dynamics Simulation: Periodic Changes in Morphology Depending on Film Thickness
Susumu Ogata,
Susumu Ogata
Nagoya University, Nagoya, Japan
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Hedong Zhang,
Hedong Zhang
Nagoya University, Nagoya, Japan
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Kenji Fukuzawa,
Kenji Fukuzawa
Nagoya University, Nagoya, Japan
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Yasunaga Mitsuya
Yasunaga Mitsuya
Nagoya University, Nagoya, Japan
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Susumu Ogata
Nagoya University, Nagoya, Japan
Hedong Zhang
Nagoya University, Nagoya, Japan
Kenji Fukuzawa
Nagoya University, Nagoya, Japan
Yasunaga Mitsuya
Nagoya University, Nagoya, Japan
Paper No:
IJTC2006-12106, pp. 875-884; 10 pages
Published Online:
October 2, 2008
Citation
Ogata, S, Zhang, H, Fukuzawa, K, & Mitsuya, Y. "Quantification of the Surface Morphology of Lubricant Films With Polar End Groups Using Molecular Dynamics Simulation: Periodic Changes in Morphology Depending on Film Thickness." Proceedings of the STLE/ASME 2006 International Joint Tribology Conference. Part B: Magnetic Storage Tribology; Manufacturing/Metalworking Tribology; Nanotribology; Engineered Surfaces; Biotribology; Emerging Technologies; Special Symposia on Contact Mechanics; Special Symposium on Nanotribology. San Antonio, Texas, USA. October 23–25, 2006. pp. 875-884. ASME. https://doi.org/10.1115/IJTC2006-12106
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