Contact line friction of electrowetting actuated viscous droplets

Physical Review. E
Quoc Vo, Tuan Tran

Abstract

We examine the contact line friction coefficient of viscous droplets spreading and retracting on solid surfaces immersed in ambient oil. By using the electrowetting effect, we generate a surface tension imbalance to drive the spreading and the retracting motion of the three-phase contact line (TCL). We show that neither the driving force intensity nor TCL direction significantly influences the friction coefficient. Instead, the friction coefficient depends equivalently on the viscosity of liquid droplets and the surrounding oil. We derive and experimentally verify a transient timescale that can be used to characterize both the spreading and retracting dynamics.

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Citations

Nov 14, 2019·Soft Matter·Susumu YadaGustav Amberg
May 28, 2019·Scientific Reports·Yaerim LeeJunichiro Shiomi
Aug 7, 2019·Physical Review Letters·Quoc Vo, Tuan Tran
Oct 16, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Dipayan ChakrabortyMonojit Chakraborty
Sep 2, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Susumu YadaShervin Bagheri
Oct 2, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Qingrui SongJiaxin Ye

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