Ultralow voltage irreversible electrowetting dynamics of an aqueous drop on a stainless steel surface

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題名:	Ultralow voltage irreversible electrowetting dynamics of an aqueous drop on a stainless steel surface
作者:	曹恆光;Liu, Yanna;Liang, Yu-En;Sheng, Yu-Jane;Tsao, Heng-Kwong
貢獻者:	工學院化學工程與材料工程學系
關鍵詞:	air;contact angle;electric field;electric power;prediction;stainless steel
日期:	2015-03-02
上傳時間:	2026-04-21 14:34:32 (UTC+8)
出版者:	American Chemical Society;United States: American Chemical Society
摘要:	摘要： The electrowetting dynamics of a water drop on a stainless steel surface in air is investigated under ultralow voltages. The spreading behavior can be classified into three regimes. The drop expands slowly in regime I, but the spreading accelerates quite rapidly in regime II. The spreading becomes insignificant in regime III. The experimental results are compared to the equilibrium shapes acquired by Surface Evolver simulations. The good agreement between them indicates that the slow electrowetting dynamics can be considered to be a quasi-equilibrium process. The influences of the electric field and drop size on the spreading dynamics are examined. The variation of both the contact angle and base diameter with time in regimes II and III can be well described by the exponential change with a characteristic time, which grows with the drop volume but is inversely proportional to the electric field. A simple model based on the electromechnical mechanism is proposed to explain the spreading dynamics. The exponential change is attributed to ion migration from the bulk of the drop to the contact line. The experimental results agree well with the prediction of our simple theory. 其他題名： Langmuir 出版者： United States: American Chemical Society 出版日期： 2015-04-07 出處： Langmuir, 2015-04, Vol.31 (13), p.3840-3846 資源來源： American Chemical Society Journals 版權： Copyright © American Chemical Society 識別號： ISSN: 0743-7463 識別號： ISSN: 1520-5827 識別號： EISSN: 1520-5827 識別號： DOI: 10.1021/acs.langmuir.5b00411 識別號： PMID: 25730308
顯示於類別:	[化學工程與材料工程學系 ] 期刊論文

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