Surface structure determines dynamic wetting

Jiayu Wang, Minh Do-Quang, James J. Cannon, Feng Yue, Yuji Suzuki, Gustav Amberg, Junichiro Shiomi

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

Liquid wetting of a surface is omnipresent in nature and the advance of micro-fabrication and assembly techniques in recent years offers increasing ability to control this phenomenon. Here, we identify how surface roughness influences the initial dynamic spreading of a partially wetting droplet by studying the spreading on a solid substrate patterned with microstructures just a few micrometers in size. We reveal that the roughness influence can be quantified in terms of a line friction coefficient for the energy dissipation rate at the contact line, and that this can be described in a simple formula in terms of the geometrical parameters of the roughness and the line-friction coefficient of the planar surface. We further identify a criterion to predict if the spreading will be controlled by this surface roughness or by liquid inertia. Our results point to the possibility of selectively controlling the wetting behavior by engineering the surface structure.

Original languageEnglish
Article number8474
JournalScientific reports
Volume5
DOIs
Publication statusPublished - 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

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