Wetting and electrowetting on corrugated substrates

doi:10.1063/1.4984244

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	Wetting and electrowetting on corrugated substrates
	Wang ZL(王占龙); Zhao YP(赵亚溥); Zhao, YP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.; Zhao, YP (reprint author), Univ Chinese Acad Sci, Sch Engn Sci, 19 Yu Quan Rd, Beijing 100049, Peoples R China.
发表期刊	PHYSICS OF FLUIDS
	2017-06-01
卷号	29 期号:6
ISSN	1070-6631
摘要	Wetting and electrowetting (EW) on corrugated substrates are studied experimentally and theoretically in this paper. On corrugated substrates, because of the anisotropy of surface morphology, the droplet shows an elliptical shape and the spreading velocities in different directions are different. Spreading of a droplet is usually controlled not only by the surface tensions but also by hemi-wicking. Our experimental results indicated that liquids along the grooves propagate much faster than those in the direction vertical to the grooves. However, spreading in both directions obeys the same scaling law of l similar to t(4/5). EW on corrugated substrates reveals some differences with that on smooth surfaces. The change of contact angles with an applied voltage follows a linear relationship in two stages instead of the smooth curve on flat surfaces. There exists a critical voltage which divides the two stages. The transition of a droplet from the Cassie state to the Wenzel state on corrugated substrates was also discussed. The extended EW equation was derived with the free energy minimization approach, and the anisotropic factor was introduced. From the extended equation, it is found that EW is affected by the anisotropic factor significantly. For the smooth surfaces, the extended EW equation will degenerate to the classical Lippmann-Young equation. Our research may help us to understand the wetting and EW of droplets on corrugated substrates and assist in their design for practical applications. Published by AIP Publishing.
DOI	10.1063/1.4984244
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000404636900050
关键词[WOS]	PATTERNED SURFACES ; CONTACT-ANGLE ; DYNAMICS ; FILMS ; DROP ; STATICS ; WATER ; LENS
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
项目资助者	National Natural Science Foundation of China (NSFC)(U1562105 ; Chinese Academy of Sciences (CAS) through CAS Interdisciplinary Innovation Team Project ; CAS Key Research Program of Frontier Sciences(QYZDJ-SSW-JSC019) ; CAS Strategic Priority Research Program(XDB22040401) ; 11611130019 ; 11372313)
课题组名称	LNM纳/微系统力学与物理力学
论文分区	一类/力学重要期刊
力学所作者排名	1
引用统计	被引频次：29[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/60900
专题	非线性力学国家重点实验室
通讯作者	Zhao, YP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.; Zhao, YP (reprint author), Univ Chinese Acad Sci, Sch Engn Sci, 19 Yu Quan Rd, Beijing 100049, Peoples R China.
推荐引用方式 GB/T 7714	Wang ZL,Zhao YP,Zhao, YP ,et al. Wetting and electrowetting on corrugated substrates[J]. PHYSICS OF FLUIDS,2017,29,6,.
APA	王占龙,赵亚溥,Zhao, YP ,&Zhao, YP .(2017).Wetting and electrowetting on corrugated substrates.PHYSICS OF FLUIDS,29(6).
MLA	王占龙,et al."Wetting and electrowetting on corrugated substrates".PHYSICS OF FLUIDS 29.6(2017).

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