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 | |
发表期刊 | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS |
2019-08-05 | |
卷号 | 574页码:215-220 |
ISSN | 0927-7757 |
摘要 | 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. |
关键词 | Evaporation Droplet PDMS Constant contact radius mode Constant contact angle mode Spreading |
DOI | 10.1016/j.colsurfa.2019.04.069 |
收录类别 | SCI ; EI |
语种 | 英语 |
WOS记录号 | WOS:000471654700025 |
关键词[WOS] | SESSILE WATER DROPLET ; STICK-SLIP BEHAVIOR ; CONTACT LINE ; MARANGONI-FLOW ; NANOPARTICLE ; SUPPRESSION ; HYDROPHOBICITY ; TRANSITION ; PATTERNS ; KINETICS |
WOS研究方向 | Chemistry |
WOS类目 | Chemistry, Physical |
资助项目 | National 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 |
项目资助者 | National Natural Science Foundation of China ; Chinese Academy of Sciences Strategic Priority Research Program ; Laboratory of Nonlinear Mechanics, Chinese Academy of Sciences |
论文分区 | 二类 |
力学所作者排名 | 3 |
RpAuthor | Yu, Ying-Song ; Zhou, Jin-Zhi |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/79385 |
专题 | 非线性力学国家重点实验室 |
推荐引用方式 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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