Abstract
Water droplets, which are stuck to the hydrophilic surface, reduce the friction coefficient when they are slid against the hydrophobic surface. This is because a repulsive force is generated between water and hydrophobic surfaces due to the surface tension of water. In the present experimental system, the water droplets carried the load up to 170mN and showed the coefficient of friction between the surfaces as low as 0.0011. The low coefficient of friction is attributable to the low energy loss during the adhesion hysteresis process of water onto the hydrophobic surfaces. In micro-machine applications, the water droplet lubrication is effective for reducing the coefficient of friction by utilizing the repulsive force between water and the hydrophobic surface.
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