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Title: Hierarchical structured sol–gel coating by laser textured template imprinting for surface superhydrophobicity
Authors: Wu, Linda Y. L.
Shao, Qi
Wang, X. C.
Zheng, H. Y.
Wong, Chee Cheong
Issue Date: 2012
Source: Wu, L. Y. L., Shao, Q., Wang, X. C., Zheng, H. Y., & Wong, C. C. (2012). Hierarchical structured sol–gel coating by laser textured template imprinting for surface superhydrophobicity. Soft Matter, 8(23), 6232-6238.
Series/Report no.: Soft matter
Abstract: This paper reports a fabrication method generating biomimetic hierarchical structures simulating the lotus leaf’s surface resulting in superhydrophobicity and self-cleaning functions. The surface micro-patterns were imprinted on a hard sol–gel protective coating by a template made by the laser direct ablation technique. Bump structures were precisely controlled. The nano-structures were superimposed by self-assembled surface modified silica nanoparticles, forming two scale hierarchical structures. The water contact angle of the micropatterned surface after imprinting was 138°, which was further increased to 160.3° with hysteresis of 0.9° by superimposing nanoparticles. The superhydrophobicity is comparable to the natural lotus leaf and the hierarchical structure is an optimal combination of micro- and nano-structures, which mimics the lotus leaf’s surface. A comprehensive theoretical model which combines Wenzel and Cassie–Baxter states including the transition mode and the roughness factor predicted the air-trapping fraction as being 83% on the optimum structure. This fabrication method is fast, cost effective and reproducible for large areas. This paper also provides a design guideline for predetermined experimental parameters to achieve the lotus leaf effect.
ISSN: 1744-683X
DOI: 10.1039/c2sm25371b
Rights: © 2012 The Royal Society of Chemistry.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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