Drastic reduction of dynamic liquid-solid friction in supercooled glycerol
arXiv (Cornell University)(2023)
摘要
This study addresses the influence of internal liquid dynamics on
liquid-solid friction. Taking advantage of the wide range of relaxation
timescales in supercooled liquids, we use a tuning-fork-based AFM to measure
the slippage of supercooled glycerol on mica at 30 kHz. We report a 2-order of
magnitude increase of slippage with decreasing temperature by only 30C.
More importantly, as the bulk liquid dynamics are slowed with decreasing
temperature, we report a sharp drop of the interfacial friction coefficient in
contrast with the usual assumption of thermally activated interfacial dynamics.
To rationalize this original behavior, we account for the contribution of solid
fluctuations to liquid friction. We show that a minimalistic single
phonon-branch model of the mica surface yields semi-quantitative agreement with
our measurements. In this picture, the liquid's relaxation rate is the tuning
knob between two friction regimes where the wall is seen either as a static
corrugated potential or as a thermally fluctuating surface. Remarkably, this
study bridges soft and hard condensed matter: hydrodynamic flow controlled by
the solid's dynamical modes.
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关键词
glycerol,liquid-solid
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