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Evaporation of ethanol/water mixture droplets on a pillar-like PDMS surface
Yu YS(余迎松); Sun L; Huang XF(黄先富); Zhou JZ
Source PublicationCOLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
2019-08-05
Volume574Pages:215-220
ISSN0927-7757
Abstract

Evaporation of about 6.0 mu L ethanol/water droplets with different ethanol concentrations on both planar and pillar-like polydimethylsiloxane (PDMS) surfaces was studied. A small fraction of the as-fabricated pillar-like PDMS surface is Wenzel-wetted while other part Cassie-Baxter-wetted. When ethanol/water droplet evaporates on a planar PDMS surface, the contact radius continuously decreases with time, and the contact angle first increases to the maximum, then keeps unchanged and finally decreases. However, when a mixture droplet evaporates on a pillar-like PDMS surface, the droplet first experiences a relatively long constant contact radius (CCR) stage without or with the addition of ethanol. There is a spreading process in the final stage of a mixture droplet with an initial ethanol concentration of 25%. A spontaneous spreading is also found at the end of the CCR stage when a 50% ethanol/water mixture droplet evaporates on a pillar-like PDMS surface. To better understand the spreading behavior, a KH-8700 microscopy was used to record the process from top view and it was found that the solid-liquid area developed to an octagon. The average spreading speed was measured to be 0.3-0.9 mu m/s. Using Taylor's expansion theorem, excess free energy was calculated and it is concluded that evaporating droplet will spontaneously spread on a pillar-like PDMS surface when the excess energy becomes larger than the energy barrier.

KeywordEvaporation Droplet PDMS Constant contact radius mode Constant contact angle mode Spreading
DOI10.1016/j.colsurfa.2019.04.069
Indexed BySCI ; EI
Language英语
WOS IDWOS:000471654700025
WOS KeywordSESSILE WATER DROPLET ; STICK-SLIP BEHAVIOR ; CONTACT LINE ; MARANGONI-FLOW ; NANOPARTICLE ; SUPPRESSION ; HYDROPHOBICITY ; TRANSITION ; PATTERNS ; KINETICS
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
Funding ProjectNational Natural Science Foundation of China[11572114] ; National Natural Science Foundation of China[11702299] ; Chinese Academy of Sciences Strategic Priority Research Program[XDB22040401] ; Laboratory of Nonlinear Mechanics, Chinese Academy of Sciences
Funding OrganizationNational Natural Science Foundation of China ; Chinese Academy of Sciences Strategic Priority Research Program ; Laboratory of Nonlinear Mechanics, Chinese Academy of Sciences
Classification二类
Ranking3
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/79386
Collection非线性力学国家重点实验室
Recommended Citation
GB/T 7714
Yu YS,Sun L,Huang XF,et al. Evaporation of ethanol/water mixture droplets on a pillar-like PDMS surface[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2019,574:215-220.
APA 余迎松,Sun L,黄先富,&Zhou JZ.(2019).Evaporation of ethanol/water mixture droplets on a pillar-like PDMS surface.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,574,215-220.
MLA 余迎松,et al."Evaporation of ethanol/water mixture droplets on a pillar-like PDMS surface".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 574(2019):215-220.
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