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Electrostatic cloaking of surface structure for dynamic wetting.

Satoshi Nita1, Minh Do-Quang2, Jiayu Wang1

  • 1Department of Mechanical Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.

Science Advances
|March 10, 2017
PubMed
Summary
This summary is machine-generated.

Electrostatics can overcome surface roughness hindering liquid spreading. This "cloaking" effect reduces contact-line friction, making dynamic wetting independent of surface properties.

Keywords:
Dynamic wettingcloakingelectrostaticssurface microstructure

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Area of Science:

  • Physics
  • Materials Science
  • Surface Science

Background:

  • Dynamic wetting describes liquid-solid interactions, influenced by liquid properties, surface characteristics, and electric effects.
  • Microscopic surface roughness can significantly impede liquid spreading, complicating wetting phenomena.
  • Electrostatic forces play a crucial role in fluid manipulation and wetting behavior.

Purpose of the Study:

  • To investigate the interplay between electric forces and surface structures in dynamic wetting.
  • To understand how electrostatics influence the hindering effect of surface microstructures on liquid spreading.

Main Methods:

  • Experimental investigation of dynamic wetting on structured surfaces.
  • Application of electric fields to manipulate wetting behavior.
  • Analysis of contact-line friction and its dependence on surface properties and electric forces.

Main Results:

  • Surface microstructures were found to significantly hinder dynamic wetting.
  • Electrostatic forces were shown to 'cloak' surface microstructures, deactivating their hindering effect.
  • A reduction in contact-line friction was identified as the underlying physical mechanism.
  • Dynamic wetting became insensitive to substrate properties under the influence of electrostatics.

Conclusions:

  • Electrostatics can effectively overcome the limitations imposed by surface roughness on dynamic wetting.
  • The 'cloaking' effect is attributed to reduced contact-line friction, leading to inertial force dominance.
  • This finding offers new possibilities for controlling liquid spreading using electric fields.