Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Change in Water Contact Angle on Electrospray-Synthesized SiO2 Coated Layers by Plasma Exposure

플라즈마 조사에 의한 전기분무합성 SiO2 코팅층의 물접촉각 변화

  • Kim, Jae-Hun (Department of Materials Science and Engineering, Inha University) ;
  • Lee, Junseong (Department of Materials Science and Engineering, Inha University) ;
  • Kim, Ji Yeong (Department of Materials Science and Engineering, Inha University) ;
  • Kim, Sang Sub (Department of Materials Science and Engineering, Inha University)
  • 김재훈 (인하대학교 신소재공학과) ;
  • 이준성 (인하대학교 신소재공학과) ;
  • 김지영 (인하대학교 신소재공학과) ;
  • 김상섭 (인하대학교 신소재공학과)
  • Received : 2014.07.10
  • Accepted : 2014.10.14
  • Published : 2014.11.27
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Abstract

Hydrophilic $SiO_2$ layers were obtained by the atmospheric-pressure plasma treatment. Superhydrophobic $SiO_2$ layers were first deposited by the electrospray deposition method. The electrospunable solution that was prepared based on the solgel method was sprayed on Si (100) substrates. The surface of the electrosprayed $SiO_2$ layers consisted of the agglomeration of nano-sized grains, which led to a very high roughness and revealed a very high contact angle to water droplets over $162^{\circ}$. After having been exposed to the atmospheric $Ar/O_2$ plasma, the observed superhydrophobicity of the $SiO_2$ layers were greatly changed: a dramatic variation of the water contact angle from $162^{\circ}$ to $3^{\circ}$, namely realization of superhydrophillicity. Interestingly, the surface microstructure was almost preserved. According to the XPS analysis, it is more likely that thanks to the plasma exposure, the surface of $SiO_2$ layers will be cleaned in terms of organic species that are hydrophobic-inducing, consequently leading to the hydrophilic nature observed for the plasma-exposed $SiO_2$ layers.

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References

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