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Redox-switchable superhydrophobic silver composite
Authors:Sinha Arun Kumar  Basu Mrinmoyee  Pradhan Mukul  Sarkar Sougata  Negishi Yuichi  Pal Tarasankar
Institution:Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India.
Abstract:Unique packaging of Ag(2)O on the surface of polycrystalline AgCl allows fabrication of a new useful, superhydrophobic composite material. This pure inorganic material with surface porosity of submicrometer aperture size fabricates air pockets, which make the composite material superhydrophobic. The new material behaves like lotus leaves, butterfly wings, or water strider's leg in relation to superhydrophobicity. Visible light induces photoreduction of solid Ag(2)O surface layer and generates Ag(0), making the composite surface superhydrophilic. Reoxidation of Ag(0) on the composite surface gives back the hydrophobicity that represents the redox-switchable wetting property of the material.
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