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http://dx.doi.org/10.9725/kstle.2003.19.5.245

Nanotribological Behavior of Adsorbed Water Layer on Silicon Surface  

안효석 (한국과학기술연구원 트라이볼로지연구센터)
김두인 (한국과학기술연구원 트라이볼로지연구센터)
최동훈 (한양대 기계공학부)
Publication Information
Tribology and Lubricants / v.19, no.5, 2003 , pp. 245-250 More about this Journal
Abstract
Water is known to playa crucial role on friction of moving parts in nanoscale contact. Little is, however, known about the tribological behavior of a solid surface that is covered with water adsorption layer. The objective of this study is to investigate the nanotribological behavior of the water layer in relation to water affinity of the surface and relative humidity. This paper presents an examination of the frictional behavior of water adsorption layer as 'confined liquid film'. It is shown that the friction is inversely proportional to the hydrophilicity of surface and relative humidity. On the other hand, friction of hydrophobic surface is not influenced by relative humidity. A model is proposed for the water-mediated contact in which it is shown that the water layer between two hydrophilic surfaces with high relative humidity behaves as a lubricant.
Keywords
microsystem; humidity; adsorption layer; capillary force; confined liquid film; shear stress;
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