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Coatings 2017, 7(11), 194; https://doi.org/10.3390/coatings7110194

Fabrication of an Anisotropic Superhydrophobic Polymer Surface Using Compression Molding and Dip Coating

1
School of Mechanical Engineering, University of Ulsan, Ulsan 44610, Korea
2
Department of Nano Manufacturing Technology, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Ioannis Karapanagiotis
Received: 12 October 2017 / Revised: 4 November 2017 / Accepted: 7 November 2017 / Published: 10 November 2017
(This article belongs to the Special Issue Superhydrophobic Coatings)
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Abstract

Many studies of anisotropic wetting surfaces with directional structures inspired from rice leaves, bamboo leaves, and butterfly wings have been carried out because of their unique liquid shape control and transportation. In this study, a precision mechanical cutting process, ultra-precision machining using a single crystal diamond tool, was used to fabricate a mold with microscale directional patterns of triangular cross-sectional shape for good moldability, and the patterns were duplicated on a flat thermoplastic polymer plate by compression molding for the mass production of an anisotropic wetting polymer surface. Anisotropic wetting was observed only with microscale patterns, but the sliding of water could not be achieved because of the pinning effect of the micro-structure. Therefore, an additional dip coating process with 1H, 1H, 2H, 2H-perfluorodecythricholosilanes, and TiO2 nanoparticles was applied for a small sliding angle with nanoscale patterns and a low surface energy. The anisotropic superhydrophobic surface was fabricated and the surface morphology and anisotropic wetting behaviors were investigated. The suggested fabrication method can be used to mass produce an anisotropic superhydrophobic polymer surface, demonstrating the feasibility of liquid shape control and transportation. View Full-Text
Keywords: anisotropic superhydrophobic surface; hierarchical micro-nano structure; dip coating; compression molding; ultra-precision machining anisotropic superhydrophobic surface; hierarchical micro-nano structure; dip coating; compression molding; ultra-precision machining
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Lee, K.-M.; Ngo, C.-V.; Jeong, J.-Y.; Jeon, E.-C.; Je, T.-J.; Chun, D.-M. Fabrication of an Anisotropic Superhydrophobic Polymer Surface Using Compression Molding and Dip Coating. Coatings 2017, 7, 194.

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