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Simulation of Sessile Water-Droplet Evaporation on Superhydrophobic Polymer Surfaces
Shuai-xia Tan ,Xiao-yan Zhang ,Ning Zhao ,Jian Xu*
Author NameAffiliation
Shuai-xia Tan State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China 
Xiao-yan Zhang State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China 
Ning Zhao State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China 
Jian Xu* State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China 
Abstract:
Evaporation of sessile water-droplets on superhydrophobic polymer surfaces has been simulated in recent research. Models based on the ellipsoidal cap geometry and spherical cap geometry, which were originally put forward to describe the profile of a droplet during its evaporation process on a solid surface with a contact angle <90±, are developed to reveal the issue with an initial contact angles larger than 150±. To verify the validity of the model, experiments on superhydrophobic polycarbonate, and °uorinated polyurethane and poly (methyl methacrylate) blend surfaces were carried out. It was observed that the change trends of contact angle and height of the droplet against evaporation time on the superhydrophobic surfaces experimentally are consistent with the simulated results by ellipsoidal and spherical cap models. The ellipsoidal cap model shows the better fits due to the shape distortions of droplets.
Key words:  Evaporation, Superhydrophobicity, Contact angle, Ellipsoidal cap geometry
FundProject:This work was supported by the National Natural Science Foundation of China (No.50373049, No.50521302 and No.50425312), 973 Program (No.2005CCA00800) and the Innovation Project of Chinese Academy of Sciences.
超疏水聚合物表面的水滴蒸发模拟
谭帅霞 ,张晓艳 ,赵宁 ,徐坚*
摘要:
基于质量守恒和Fick第一定律,模拟了水滴在超疏水聚合物表面的蒸发全过程.研究从以往的接触角<90±扩展到>150±,液滴形貌扩展为椭球球帽模型进行疏水表面蒸发模拟.水滴在超疏水PC和FPU/PMMA表面蒸发的实验结果显示,计算的椭球球帽模型可以更好的反映出液滴接触角和高度的变化情况,并且不同聚合物表面接触角的相同变化趋势也揭示出微-纳二级结构表面结构不仅影响液滴接触角,也影响液滴蒸发模式.
关键词:  蒸发,超疏水,接触角,椭球模型
DOI:10.1360/cjcp2007.20(2).140.5
分类号: