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Quasi-static motion of microparticles at the depinning contact line of an evaporating droplet on PDMS surface
Yu YS(余迎松); Xia XL; Zheng X(郑旭); Huang XF(黄先富); Zhou JZ; Yu, YS (reprint author), Hubei Univ Technol, Sch Civil Architecture & Environm, Dept Mech, Wuhan 430068, Hubei, Peoples R China.
Source PublicationSCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
2017-09-01
Volume60Issue:9Pages:Ar094612
ISSN1674-7348
Abstract

In this paper, evaporation of sessile water droplets containing fluorescent polystyrene (PS) microparticles on polydimethylsiloxane (PDMS) surfaces with different curing ratios was studied experimentally using laser confocal microscopy. At the beginning, there were some microparticles located at the contact line and some microparticles moved towards the line. Due to contact angle hysteresis, at first both the contact line and the microparticles were pinned. With the depinning contact line, the microparticles moved together spontaneously. Using the software ImageJ, the location of contact lines at different time were acquired and the circle centers and radii of the contact lines were obtained via the least square method. Then the average distance of two neighbor contact lines at a certain time interval was obtained to characterize the motion of the contact line. Fitting the distance-time curve at the depinning contact line stage with polynomials and differentiating the polynomials with time, we obtained the velocity and acceleration of both the contact line and the microparticles located at the line. The velocity and the maximum acceleration were, respectively, of the orders of 1 mu m/s and 20-200 nm/s(2), indicating that the motion of the microparticles located at the depinning contact line was quasi-static. Finally, we presented a theoretical model to describe the quasi-static process, which may help in understanding both self-pinning and depinning of microparticles.

KeywordDroplet Evaporation Pdms Contact Line Van Der Waals Force Electrostatic Force Drag Force Capillary Force
DOI10.1007/s11433-017-9060-3
URL查看原文
Indexed BySCI ; EI ; CSCD
Language英语
WOS IDWOS:000406283000006
WOS KeywordSessile Water Droplet ; Soft Surfaces ; Particle ; Suppression ; Deposition ; Polymers ; Stains ; Flow
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China(11572114 ; Opening Fund of State Key Laboratory of Nonlinear Mechanics (LNM) ; CAS Strategic Priority Research Program(XDB22040403) ; CAS Key Research Program of Frontier Sciences(QYZDJ-SSW-JSC019) ; 11572335 ; U1562105)
DepartmentLNM纳/微系统力学与物理力学
Classification二类/q1
Ranking3
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/70022
Collection非线性力学国家重点实验室
Corresponding AuthorYu, YS (reprint author), Hubei Univ Technol, Sch Civil Architecture & Environm, Dept Mech, Wuhan 430068, Hubei, Peoples R China.
Recommended Citation
GB/T 7714
Yu YS,Xia XL,Zheng X,et al. Quasi-static motion of microparticles at the depinning contact line of an evaporating droplet on PDMS surface[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2017,60(9):Ar094612.
APA Yu YS,Xia XL,Zheng X,Huang XF,Zhou JZ,&Yu, YS .(2017).Quasi-static motion of microparticles at the depinning contact line of an evaporating droplet on PDMS surface.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,60(9),Ar094612.
MLA Yu YS,et al."Quasi-static motion of microparticles at the depinning contact line of an evaporating droplet on PDMS surface".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 60.9(2017):Ar094612.
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