Abstract
A water droplet behavior on the liquid n-octadecane film is investigated. The coating of hydrophobic surface by N-octadecane film provides exchange of wetting state on the surface. The polycarbonate surface is crystallized and the functionalized silica particles are placed on the resulting surface prior to thin film coating of n-octadecane. A high-speed camera is used to monitor dynamic characteristics of the droplet on the inclined film. The findings reveal that deposition of thin n-octadecane film on hydrophobic surface results in reversibly exchange of the wetting state at the surface, which remains hydrophobic when n-octadecane film is in solid phase while it becomes hydrophilic when n-octadecane film liquefies. Droplet transition velocity predicted agrees well with the experimental data. Sliding mode of the water droplet governs droplet transition on the liquid surface. Droplet pinning force, due to interfacial tension, dominates over the other retention forces including drag and shear.
Highlights
The droplet mobility on the liquid surfaces were investigated previously
The findings revealed that the micro/nano hierarchical surface structure and chemical components with low surface free energy of the superhydrophobic surface jointly contributed to the reduction of skin friction drag and subsequently made it possible for the motion of the water droplet driven by applied electric field
A thin film of n-octadecane coating on the surface of the crystalized and silica particles deposited wafer resulted in exchange of the surface wetting state
Summary
The droplet mobility on the liquid surfaces were investigated previously. Droplet spreading on a surface exhibiting solid-liquid interfacial pre-melting was studied by Yang and Laird[11]. In the present study, water droplet behavior on the liquid film formed from the phase of phase material is investigated in relation to wetting state exchange of the surface.
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