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Sliding of Water Droplets on Hydrophobic Surfaces with Various Hydrophilic Region Sizes

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Tsutomu Furuta†, Munetoshi Sakai‡, Toshihiro Isobe†, Sachiko Matsushita†, and Akira Nakajima*†‡

^† Department of Metallurgy and Ceramic Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan

^‡ Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park, 3-2-1 Sakado, Takatsu-ku, Kawasaki-shi, Kanagawa 213-0012, Japan

Langmuir, 2011, 27 (11), pp 7307–7313

DOI: 10.1021/la200396v

Publication Date (Web): April 28, 2011

*Telephone: +81-3-5734-2524. Fax: +81-3-5734-3355. E-mail: anakajim@ceram.titech.ac.jp.

Section:

Surface Chemistry and Colloids

Abstract

Four patterned surfaces with hydrophilic areas of different sizes were prepared using photolithography with a smooth octadecyltrimethoxysilane (ODS) hydrophobic coating. The hydrophilic area in the surfaces was aligned hexagonally with a constant area fraction. The sliding angle and contact angle hysteresis of the water droplets increased concomitantly with increasing pattern size. The increase of the contact line distortion between defects at the receding side plays an important role in this trend. The droplet sliding velocity also increased concomitantly with increasing pattern size. This trend was simulated by a simple flow model. The contribution of the interface between the ODS region and the hydrophilic area was deduced from this trend. This study demonstrated the different size dependency of the chemical surface defects for sliding behavior between the critical moment at which a droplet slides down and the period when a droplet is sliding.

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