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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.
Source PublicationPHYSICS OF FLUIDS
2017-06-01
Volume29Issue:6
ISSN1070-6631
AbstractWetting 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.
DOI10.1063/1.4984244
Indexed BySCI ; EI
Language英语
WOS IDWOS:000404636900050
WOS KeywordPATTERNED SURFACES ; CONTACT-ANGLE ; DYNAMICS ; FILMS ; DROP ; STATICS ; WATER ; LENS
WOS Research AreaMechanics ; Physics
WOS SubjectMechanics ; Physics, Fluids & Plasmas
Funding OrganizationNational 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)
DepartmentLNM纳/微系统力学与物理力学
Classification一类/力学重要期刊
Ranking1
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60900
Collection非线性力学国家重点实验室
Corresponding AuthorZhao, 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.
Recommended Citation
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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