Droplet viscosity effects on dynamic hydrophobicity of a solid–liquid bulk composite prepared from porous glass

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• 作者：Kota Yokoyama ; Munetoshi Sakai ; Toshihiro Isobe…
• 刊名：Journal of Materials Science
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：52
• 期：1
• 页码：595-604
• 全文大小：1,184 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803
• 卷排序：52

文摘

Hydrophobic porous glass plates were prepared by coating a fluorosilane (FAS17) onto a commercial porous glass (average pore size, approx. 1 μm). Based on the spreading coefficients from interface energies, we prepared solid–liquid bulk composites (SLBC) without direct contact between the solid surface and liquid droplet by impregnation of silicone oil into the silane-coated porous glass. Impregnating the oil into the porous glass decreased both the sliding angle (ca. 20° → ca. 5°) and contact angle (ca. 135° → ca. 100°). The sliding velocity of the liquid droplets on the SLBC decreased when the droplet viscosity was increased using a water–glycerin mixture. Analysis by particle image velocimetry revealed that increasing the viscosity remarkably decreases the slipping motion and increases the contribution of rolling. Results suggest that the practical internal fluidity of the droplets during sliding on the SLBC is governed by the combination of the droplet liquid and the oil impregnated into the porous media.