Direct measurement of friction of a fluctuating contact line

Shuo Guo, Min Gao, Xiaomin Xiong, Yong Jian Wang, Xiaoping Wang, Ping Sheng, Penger Tong

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We report a direct measurement of the friction coefficient of a fluctuating (and slipping) contact line using a thin vertical glass fiber of diameter d with one end glued onto a cantilever beam and the other end touching a liquid-air interface. By measuring the broadening of the resonant peak of the cantilever system with varying liquid viscosity η, we find the friction coefficient of the contact line has a universal form, ξc 0.8πdη, independent of the liquid-solid contact angle. The obtained scaling law is further supported by the numerical simulation based on the phase field model under the generalized Navier boundary conditions.

Original languageEnglish (US)
Article number026101
JournalPhysical review letters
Issue number2
StatePublished - Jul 10 2013
Externally publishedYes


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