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    Preparation of highly stable superhydrophobic TiO2 surfaces with completely suppressed photocatalytic activity

    Year: 2013

    Journal: Progress in Organic Coatings, 76, pp 596-600, 20130926

    Authors: Kwang-Dae Kim, Hyun Ook Seo, Chae Won Sim, Myung-Geun Jeong, Young Dok Kim, Dong Chan Lim∗∗

    Organizations: Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Republic of Korea, Materials Processing Division, Korea Institute of Materials Science, Changwon 641-010, Republic of Korea

    TiO2 nanoparticles with a mean size of 20–30 nm were covered by ultrathin polydimethylsiloxane (PDMS)film, which shows hydrophobic properties. Surfaces consisting of the PDMS-coated TiO2 particles showedwater contact angles close to 170◦. In contrast to the hydrophobic films consisting of organic molecules,which can be photocatalytically decomposed on TiO2 in the presence of UV light, PDMS-coating on TiO2was highly stable. The PDMS-coating completely suppressed the photocatalytic activity of TiO2. Theunique properties of PDMS-coating can be exploited for UV protection layer and self-cleaning surfaces.