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    Conformal ZnO nanocomposite coatings on micro-patterned surfaces for superhydrophobicity

    Year: 2010

    Journal: Thin Solid Films, Volume 518, Issue 19, 30 July 2010, Pages 5426-5431, 20111221

    Authors: Adam Steele a, Ilker Bayer a , Stephen Moran a , Andrew Cannon b , William P. King b , Eric Loth a

    Organizations: a Aerospace Engineering Department, The University of Illinois at Urbana-Champaign, 306 Talbot Laboratory, 104 S Wright Street Urbana, IL, 61801, USA, b Mechanical Science and Engineering Department, The University of Illinois at Urbana-Champaign, 4409 Mechanical Engineering Laboratory, 1206 West Green Street, MC-244 Urbana, IL 61801, USA

    A conformal coating process is presented to transform surfaces with inherent micro-morphology into superhydrophobic surfaces with hierarchical surface structure using wet chemical spray casting. Nanocomposite coatings composed of zinc oxide nanoparticles and organosilane quaternary nitrogen compound are dispersed in solution for application. The coating is applied to a micro-patterned polydimethylsiloxane substrate with a regular array of cylindrical microposts as well as a surface with random micro-structure for the purpose of demonstrating improved non-wettability and a superhydrophobic state for water droplets. Coating surface morphology is investigated with an environmental scanning electron microscope and surface wettability performance is characterized by static and dynamic contact angle measurements.