润湿
接触角
磁滞
毛细管作用
肺表面活性物质
润湿转变
毛细管数
机械
物理
粒子(生态学)
化学物理
纳米技术
材料科学
热力学
凝聚态物理
地质学
海洋学
作者
A. R. Harikrishnan,Purbarun Dhar,Prabhat K. Agnihotri,Sateesh Gedupudi,Sarit K. Das
出处
期刊:Physics of Fluids
[American Institute of Physics]
日期:2018-04-01
卷期号:30 (4)
被引量:22
摘要
Dynamic wettability and contact angle hysteresis can be correlated to shed insight onto any solid-liquid interaction. Complex fluids are capable of altering the expected hysteresis and dynamic wetting behavior due to interfacial interactions. We report the effect of capillary number on the dynamic advancing and receding contact angles of surfactant-based nanocolloidal solutions on hydrophilic, near hydrophobic, and superhydrophobic surfaces by performing forced wetting and de-wetting experiments by employing the embedded needle method. A segregated study is performed to infer the contributing effects of the constituents and effects of particle morphology. The static contact angle hysteresis is found to be a function of particle and surfactant concentrations and greatly depends on the nature of the morphology of the particles. An order of estimate of line energy and a dynamic flow parameter called spreading factor and the transient variations of these parameters are explored which sheds light on the dynamics of contact line movement and response to perturbation of three-phase contact. The Cox-Voinov-Tanner law was found to hold for hydrophilic and a weak dependency on superhydrophobic surfaces with capillary number, and even for the complex fluids, with a varying degree of dependency for different fluids.
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