dc.contributor.authorWu, Linda Y. L.
dc.contributor.authorShao, Qi
dc.contributor.authorWang, X. C.
dc.contributor.authorZheng, H. Y.
dc.contributor.authorWong, Chee Cheong
dc.identifier.citationWu, 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.en_US
dc.description.abstractThis 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.en_US
dc.relation.ispartofseriesSoft matteren_US
dc.rights© 2012 The Royal Society of Chemistry.en_US
dc.titleHierarchical structured sol–gel coating by laser textured template imprinting for surface superhydrophobicityen_US
dc.typeJournal Article
dc.contributor.researchSingapore Institute of Manufacturing Technologyen_US
dc.contributor.schoolSchool of Materials Science and Engineeringen_US

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