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

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Abstract

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.

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Acknowledgements

The authors are grateful to the staff of the Center of Advanced Materials Analysis (CAMA) at Tokyo Institute of Technology for SEM observations. This work was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (26630307).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8552, Japan

    Kota Yokoyama, Toshihiro Isobe, Sachiko Matsushita & Akira Nakajima

  2. Strategic Coordination of Research and Intellectual Properties, Meiji University, 1-1-1 Higashimita, Tama-ku, Kawasaki, 214-8571, Japan

    Munetoshi Sakai

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  1. Kota Yokoyama
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  2. Munetoshi Sakai
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  5. Akira Nakajima
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Correspondence to Akira Nakajima.

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Yokoyama, K., Sakai, M., Isobe, T. et al. Droplet viscosity effects on dynamic hydrophobicity of a solid–liquid bulk composite prepared from porous glass. J Mater Sci 52, 595–604 (2017). https://doi.org/10.1007/s10853-016-0356-z

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  • DOI: https://doi.org/10.1007/s10853-016-0356-z

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