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Surface structure determines dynamic wetting.

Authors
  • Wang, Jiayu1
  • Do-Quang, Minh2
  • Cannon, James J1
  • Yue, Feng1
  • Suzuki, Yuji1
  • Amberg, Gustav2
  • Shiomi, Junichiro3
  • 1 Department of Mechanical Engineering, The University of Tokyo, Tokyo, Japan. , (Japan)
  • 2 Department of Mechanics, Linné Flow Centre, The Royal Institute of Technology, Stockholm, Sweden. , (Sweden)
  • 3 1] Department of Mechanical Engineering, The University of Tokyo, Tokyo, Japan [2] CREST, Japan Science and Technology Agency, Tokyo, Japan. , (Japan)
Type
Published Article
Journal
Scientific Reports
Publisher
Springer Nature
Publication Date
Feb 16, 2015
Volume
5
Pages
8474–8474
Identifiers
DOI: 10.1038/srep08474
PMID: 25683872
Source
Medline
License
Unknown

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.

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