Droplet spreading on a two-dimensional wicking surface

作     者：Chang Quan Lai Trong Thi Mai H. Zheng P. S. Lee K. C. Leong Chengkuo Lee W. K. Choi 

作者机构：Advanced Materials for Micro- and Nano-Systems Programme Singapore-MIT Alliance Singapore 117576 Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Department of Mechanical Engineering National University of Singapore Singapore 117576 GLOBALFOUNDRIES Singapore Pte. Ltd Singapore 738406 

出 版 物：《Physical Review E》 (物理学评论E辑：统计、非线性和软体物理学)

年 卷 期：2013年第88卷第6期

页      面：062406-062406页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

基　　金：Singapore-MIT Alliance National University of Singapore GLOBALFOUNDRIES Private Ltd 

主　　题：CAPILLARY action (Heat) SILVER nanoparticles POWER law (Mathematics) PREDICTION models SOLID-liquid interfaces 

摘      要：The dynamics of droplet spreading on two-dimensional wicking surfaces were studied using square arrays of Si nanopillars. It was observed that the wicking film always precedes the droplet edge during the spreading process causing the droplet to effectively spread on a Cassie-Baxter surface composed of solid and liquid phases. Unlike the continual spreading of the wicking film, however, the droplet will eventually reach a shape where further spreading becomes energetically unfavorable. In addition, we found that the displacement-time relationship for droplet spreading follows a power law that is different from that of the wicking film. A quantitative model was put forth to derive this displacement-time relationship and predict the contact angle at which the droplet will stop spreading. The predictions of our model were validated with experimental data and results published in the literature.