2007 年 73 巻 728 号 p. 1077-1083
Effects of various periodic nanometer structures on friction coefficients and behaviors of lubricate liquid molecules were calculated by the classical molecular dynamics simulations. When the wall distance was constant, a friction coefficient decreased and became constant with pressure increase in liquid region. When the wall distance was less than 1.5 nm, a friction coefficient increased under the same pressure condition. A friction coefficient of a surface with periodic linear nanometer structures was less than that of a surface with random nanometer structures. Furthermore, a friction coefficient had a close relationship with the behaviors of liquid molecule and liquid molecules in the region surrounded with a nanostructure and a wall didn't go out even when the upper wall moved.