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Adhesion and friction properties of molecularly thin perfluoropolyether liquid films on solid surface

Hiroshi Tani1, Norio Tagawa

  • 1Department of Mechanical Engineering, Kansai University, 3-3-35, Suita-shi, Osaka 564-8680, Japan. hrstani@kansai-u.ac.jp

Langmuir : the ACS Journal of Surfaces and Colloids
|February 2, 2012
PubMed

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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