Applied Science and Convergence Technology 2015; 24(6): 219-223
Published online November 30, 2015
Copyright © The Korean Vacuum Society.
Naranchimeg Munkhbaatar , Ilhwan Ryu , Dasom Park , and Sanggyu Yim*
Department of Chemistry, Kookmin University, Seoul 136-702, South Korea
Correspondence to:Sanggyu Yim email@example.com
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Enhancement of the surface hydrophobicity of polydimethylsiloxane (PDMS) thin films deposited on substrates covered with titanium dioxide (TiO2) 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 TiO2 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 TiO2 nanospheres under the PDMS film increased the water contact angle of the film surface to 150.3°. 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.
Keywords: Polyvinylpyrrolidone, TiO2 nanospheres, Superhydrophobicity, Spray coating