Understanding the voltage-induced electrowetting and microfluidic droplet movement phenomena on a Teflon-on-flexible (TOF) substrate

电润湿 数字微流体 微流控 润湿 接触角 材料科学 电压 电极 基质(水族馆) 电介质 纳米技术 分析化学(期刊) 化学 光电子学 复合材料 色谱法 物理 物理化学 海洋学 量子力学 地质学
作者
Debopam Bhattacharya,Subhadip Chakraborty,A. Karmakar,Sanatan Chattopadhyay
出处
期刊:Physics of Fluids [American Institute of Physics]
卷期号:36 (3)
标识
DOI:10.1063/5.0190121
摘要

The current work focuses on the basic principle of voltage-induced electrowetting and relevant movement of the microfluidic droplets. The prototype of microfluidic devices are fabricated on the Teflon-on-flexible substrate. Three different liquid droplets, namely, the de-ionized (DI) water, sucrose (aq.) solution, and eugenol, have been studied for such purpose within the voltage range of 1–16 V. Electrowetting and subsequent changes in contact angle are extensively investigated with the modification of “work of adhesion” and “work of cohesion” upon application of external voltage. The liquid droplet is positioned on the dielectric-hydrophobic layer which also separates it from the metal electrodes. Eugenol exhibits more susceptibility to electrowetting compared to sucrose solution and DI water. Consequently, sucrose (aq.) solution and DI water show comparatively more droplet displacement. The “work of spreading” for the liquids under test on Teflon surface is obtained. The spreading of eugenol starts at relatively low voltages than sucrose (aq.) solution and DI water. Eugenol follows the Young–Lippmann equation, i.e., linear relation between {cos(θv) − cos(θ0)} with voltage2 (V2); however, sucrose (aq.) solution and DI water deviate from such nature. Here, θ0 and θv are the initial and voltage modified contact angles, respectively. Thus, the current study provides an accurate approach to analyze the interaction of solid–liquid surfaces and its consequent effect upon application of external voltages.
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