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    Wettability of microstructured Pyrex glass with hydrophobic and hydrophilic properties

    Year: 2017

    Journal: Surf. Coat. Technol., Volume 319, JUN 15, page 213–218

    Authors: Lee, Dong-Ki; Cho, Young Hak; Lee, Jong Whi; Park, Min Soo

    Organizations: National Research. Foundation of Korea (NRF) grant - Korean government (MSIP) [NRF-2013R1A1A1010468]

    Keywords: Grooved hybrid surface; Hydrophobicity; Hydrophilicity; Laser-induced backside wet etching (LIBWE); Wettability; Anisotropic wetting

    A grooved hybrid surface that has silane-coated surface (hydrophobic surface) on ridges and uncoated surface (hydrophilic surface) inside groove was fabricated on a Pyrex glass substrate through the laser-induced backside wet etching (LIBWE) process. The wettability characteristics of the grooved hybrid surface were evaluated from static contact angles (CAs) measured in parallel and orthogonal directions. With an increase in the width of the hydrophobic ridge, the CAs increased from 24 degrees to 104 degrees in the parallel direction. Consequently, the anisotropic wetting property of the fabricated hybrid surface was confirmed. Results of moisture condensation experiments indicated that moisture condensed rapidly in the hydrophilic grooves. Furthermore, the diffuse reflection of light was prevented when the groove was completely filled with water. (C) 2017 Elsevier B.V. All rights reserved.
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