https://scholars.lib.ntu.edu.tw/handle/123456789/598188
標題: | Coalescence-induced jumping and condensation of argon nanodroplets in the Cassie or the Wenzel state on nanopillar-arrayed surfaces | 作者: | Xie F.-F Wang D.-Q Yang Y.-R Wang X.-D Lee D.-J. DUU-JONG LEE |
關鍵字: | Coalescence;Condensation;Jumping;Pillar-arrayed surface;Wetting state;Argon;Drops;Flocculation;Molecular dynamics;Nanopillars;Textures;Wetting;Cassie state;Condensation process;Dynamics simulation;Nano-droplets;NanoPillar;Solids fraction;Wenzel state | 公開日期: | 2021 | 卷: | 628 | 來源出版物: | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 摘要: | Coalescence-induced droplet jumping on pillar-arrayed surfaces has received extensive attention. The pillar size and distribution affect the coalescence and jumping of droplets with unclear mechanisms. For the first time, this study performs molecular dynamics (MD) simulations to reveal the effects of initial wetting states on jumping and associated condensation processes at various intrinsic contact angles (θY), solid fractions (f), and roughness factors (r). The results show that although jumping and its velocity strongly depend on θY, f, and r, as reported in previous studies, the underlying mechanism to determine whether jumping occurs is the initial wetting state of coalescing droplets on textured surfaces. With the same θY and f, when the droplets are initially in the Cassie state, jumping can take place, whereas it may be hindered when the droplets are in the Wenzel state. The jumping velocity shows a decreasing trend for Cassie droplets when increasing f, but the reverse is true for Wenzel droplets. Additionally, it is found that the wetting state of a condensed droplet would transition from the Wenzel state to the Cassie state when the solid fraction increases but the pillar height and intrinsic wettability remain unchanged. ? 2021 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85111762963&doi=10.1016%2fj.colsurfa.2021.127269&partnerID=40&md5=7ffa8e1c528682f5f92999f0f416b949 https://scholars.lib.ntu.edu.tw/handle/123456789/598188 |
ISSN: | 09277757 | DOI: | 10.1016/j.colsurfa.2021.127269 |
顯示於: | 化學工程學系 |
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