PVP-assisted Synthesis of TiO2 Nanospheres and their Application to the Preparation of Superhydrophobic Surfaces

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Munkhbaatar, Naranchimeg;Ryu, Ilhwan;Park, Dasom;Yim, Sanggyu

  • 투고 : 2015.10.24
  • 심사 : 2015.10.31
  • 발행 : 2015.11.30

초록

Enhancement of the surface hydrophobicity of polydimethylsiloxane (PDMS) thin films deposited on substrates covered with titanium dioxide ($TiO_2$) 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 $TiO_2$ 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 $TiO_2$ nanospheres under the PDMS film increased the water contact angle of the film surface to $150.3^{\circ}$. 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.

키워드

Polyvinylpyrrolidone;$TiO_2$ nanospheres;Superhydrophobicity;Spray coating

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과제정보

연구 과제 주관 기관 : National Research Foundation of Korea (NRF)