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Nanotribology of Symmetric and Asymmetric Liquid Lubricants

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Author(s): Shinji Yamada

Journal: Symmetry
ISSN 2073-8994

Volume: 2;
Issue: 1;
Start page: 320;
Date: 2010;
Original page

Keywords: nanotribology | friction | surface forces apparatus | confined liquids | lubricants | stick-slip | stiction | confinement-induced phase transitions

ABSTRACT
When liquid molecules are confined in a narrow gap between smooth surfaces, their dynamic properties are completely different from those of the bulk. The molecular motions are highly restricted and the system exhibits solid-like responses when sheared slowly. This solidification behavior is very dependent on the molecular geometry (shape) of liquids because the solidification is induced by the packing of molecules into ordered structures in confinement. This paper reviews the measurements of confined structures and friction of symmetric and asymmetric liquid lubricants using the surface forces apparatus. The results show subtle and complex friction mechanisms at the molecular scale.
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