表面被覆率の異なる平滑撥水性フルオロアルキルシランコーティング上での水滴の転落挙動

鈴木 俊介; 酒井 宗寿; 吉田 直哉; 橋本 綾子; 亀島 欣一; 岡田 清; 中島 章

doi:10.4011/shikizai.83.499

Original Research Paper

Sliding Behavior of Water Droplets on Smooth Hydrophobic Fluoroalkylsilane Coatings with Different Surface Coverage Ratio

Shunsuke SUZUKI, Munetoshi SAKAI, Naoya YOSHIDA, Ayako HASHIMOTO, Yoshikazu KAMESHIMA, Kiyoshi OKADA, Akira NAKAJIMA

Author information

Shunsuke SUZUKI
Department of Metallurgy and Ceramic Science, Graduate School of Science and Engineering, Tokyo Institute of Technology
Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park
Munetoshi SAKAI
Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park
Naoya YOSHIDA
Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park
Research Center for Advanced Science and Technology, The University of Tokyo
Ayako HASHIMOTO
Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park
Yoshikazu KAMESHIMA
Department of Metallurgy and Ceramic Science, Graduate School of Science and Engineering, Tokyo Institute of Technology
Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park
Kiyoshi OKADA
Department of Metallurgy and Ceramic Science, Graduate School of Science and Engineering, Tokyo Institute of Technology
Akira NAKAJIMA
Department of Metallurgy and Ceramic Science, Graduate School of Science and Engineering, Tokyo Institute of Technology
Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park

Keywords: Hydrophobicity, Droplet, Sliding acceleration, Particle image velocimetry, Fluoroalkylsilane

JOURNAL FREE ACCESS

2010 Volume 83 Issue 12 Pages 499-504

DOI https://doi.org/10.4011/shikizai.83.499

Details

Abstract

Smooth fluoroalkylsilane (FAS17) coatings (R_a<0.2 nm) with different surface coverage ratios were prepared on a Si substrate by changing the deposition time. Then the internal fluidity of water droplets sliding on the coatings was evaluated using particle image velocimetry (PIV). The water droplets slid downward with acceleration by a caterpillar-like rotation with slippage on the solid-liquid interface. The sliding acceleration of the advancing contact line decreased concomitantly with the decreasing surface coverage ratio. However, the slipping/rolling ratio to the overall sliding acceleration was almost constant against surface coverage ratio. This result suggests that physical roughness and chemical composition contributed differently to slipping and rolling motions of the droplets.

Corresponding author

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