Title: Hydrophilic/hydrophobic surface pattern design for oil repellent function in water
Authors: Nobuyuki Moronuki; Hirokazu Tachi; Yashio Suzuki
Tokyo Metropolitan University, 6-6 Asahigaoka, Hino-shi, Tokyo, Japan
Hitachi Chemical Company, Ltd., 3-19-3 Toyosaki, Kita-ku, Osaka-shi, Osaka, Japan
Housetec Inc., Shimoezure, Chikusei-shi, Ibaraki, Japan
Abstract: Oil droplets on a hydrophilic surface are easier to remove than that on a hydrophobic surface in water due to the difference in interfacial force balances. Properly designed hydrophilic/hydrophobic pattern promotes the motion of droplet contact line which leads to self-cleaning surface. This study aims to discuss the surface design in addition to the measurement of oil droplet adhesion force. It was found that star-like hydrophobic pattern propels oil droplet better than dot or rectangular pattern with the help of directional force component. Finally, proper specification was discussed based on the experiments.
Keywords: functional surfaces; self-cleaning surfaces; wettability; patterning; oil droplets; adhesion force; hydrophilic surfaces; hydrophobic surfaces; oil repellent; water; droplet contact motion; hydrophobic patterns; hydrophilic patterns; oil stains.
Int. J. of Nanomanufacturing, 2015 Vol.11, No.1/2, pp.46 - 55
Date of acceptance: 12 Dec 2014
Available online: 09 Jul 2015