In this study, we measured temperature dependence of viscoelastic properties of PFPE lubricant that was confined in nanometer-sized gap widths. In the viscoelastic measurement, we used the fiber wobbling method, which is the highly sensitive shear force measuring method that we have originally developed. Our experimental results showed that the temperature dependence of the lubricant’s viscosity was declined at the gap width of less than 5 nm. Since the elasticity also appeared at the gap width of 5 nm, the reduced temperature dependence is considered to be caused by the repression of molecular mobility due to the solidification of the confined lubricant.

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