B-1-1 粗視化分子動力学法を用いたナノ厚さ液体潤滑膜の凝着特性解析(B-1 ディスク潤滑膜の特性,口頭発表:ヘッド・ディスク・インターフェイス)

概要

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To quantitatively investigate tribological properties of nanometer-thick liquid lubricant films using molecular simulations, we developed a coarse-graining method that is applicable to random copolymers and determined the friction coefficient in the Langevin equation based on spreading measurements of nanometer-thick liquid films on solid surfaces. Using the coarse-graining molecular dynamics, we then simulated behavior of nanometer-thick perfluoropolyether (PFPE) films coated on a solid substrate with respect to the approach and withdrawal of a solid probe. The simulation results showed that the PFPE films exhibited solid-like behavior against high-speed movement of the probe and the elongation viscosity of the PFPE film increased as the films were elongated. At the solid-solid distance of 2 nm, the shear viscosity was evaluated to be 0.33 Pa・s from the speed dependence of the adhesion forces. The consistency with the experimental value of 0.3 Pa・s demonstrates the validity of our simulation method.
一般社団法人日本機械学会の論文
2011-03-18