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PVP-assisted Synthesis of TiO2 Nanospheres and their Application to the Preparation of Superhydrophobic Surfaces
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 Title & Authors
PVP-assisted Synthesis of TiO2 Nanospheres and their Application to the Preparation of Superhydrophobic Surfaces
Munkhbaatar, Naranchimeg; Ryu, Ilhwan; Park, Dasom; Yim, Sanggyu;
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Enhancement of the surface hydrophobicity of polydimethylsiloxane (PDMS) thin films deposited on substrates covered with titanium dioxide () nanospheres was studied. First, a low-temperature solution-phase method using polyvinylpyrrolidone (PVP) as a surface capping agent and a water/dimethylformamide (DMF) mixture as the reaction medium was used to synthesize monodisperse nanospheres. It was possible to easily control hydrolysis rate of the Ti-precursors and the size of the synthesized nanospheres by varying the amount of PVP and the volume ratio of the solvent mixture. Spray coating of the synthesized nanospheres under the PDMS film increased the water contact angle of the film surface to . This simple treatment can modify the surface morphology at a nanometer scale without any long or complicated nanoprocess; hence, the surface enters the superhydrophobic Cassie-Baxter regime.
Polyvinylpyrrolidone; nanospheres;Superhydrophobicity;Spray coating;
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