Surface structure determines dynamic wetting

被引：53

作者：

Wang, Jiayu ^{[1
]}

Minh Do-Quang ^{[2
]}

Cannon, James J. ^{[1
]}

Yue, Feng ^{[1
]}

Suzuki, Yuji ^{[1
]}

Amberg, Gustav ^{[2
]}

Shiomi, Junichiro ^{[1
,3
]}

机构：

[1] Univ Tokyo, Dept Mech Engn, Tokyo 113, Japan

[2] Royal Inst Technol, Dept Mech, Linne Flow Ctr, S-10044 Stockholm, Sweden

[3] Japan Sci & Technol Agcy, CREST, Tokyo, Japan

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

基金：

日本科学技术振兴机构; 日本学术振兴会;

关键词：

TIME; DISSIPATION; DROPLET;

D O I：

10.1038/srep08474

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：7

共 38 条

[1] Omnidirectional Printing of Flexible, Stretchable, and Spanning Silver Microelectrodes [J].