4-1 ナノ隙間に閉じ込められた液体の粘弾性計測(セッション4:OS1-1 マルチスケール・シミュレーションとナノ計測)

概要

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We developed highly sensitive shear force measuring method that can be applied to evaluate viscoelasticity of liquid lubricant confined in nanometer-sized gap width. The measuring method used an optical fiber whose end was fabricated in a sphere shape to detect the shear force. The lubricant was confined between the sphere-shaped fiber tip and the solid substrate and sheared by driving the fiber in the in-plane direction using a piezo actuator. The shear force required to make the lubricant flow or deform was measured by detecting the deflection of the fiber. This method enabled us to detect the shear force with a sensitivity of around 0.1nN and control the shearing gap width with 0.1nm resolution. Our experimental results revealed that the liquid lubricant showed enhanced viscosity under the confinement. Furthermore, elasticity, which is negligibly small in the bulk state, drastically increased at the gap width less than 10nm.
一般社団法人日本機械学会の論文
2011-09-25