Korean Journal of Chemical Engineering

The Korean Institute of Chemical Engineers (한국화학공학회)
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Formation of uniform TiO2 nanoshell on α-alumina nanoplates for effective metallic luster pigments

  • Lee, Su Jin (Functional Crystallization Center (ERC), Department of Chemical Engineering, Kyung Hee University) ;
  • You, Myoung Sang (Functional Crystallization Center (ERC), Department of Chemical Engineering, Kyung Hee University) ;
  • Im, Sang Hyuk (Functional Crystallization Center (ERC), Department of Chemical Engineering, Kyung Hee University)
  • Received : 2016.03.17
  • Accepted : 2016.04.15
  • Published : 2016.09.01
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Abstract

To synthesize non-corroding effect pigment appearing metallic silver in color, we coated uniform anatase $TiO_2$ nanoshell via sol-gel chemistry. Under the reaction condition using 3 M $TiCl_4$ aqueous solution : deionized water : HCl solution=0.75 mL : 20 mL : 0 mL, ~50 nm-thick smooth $TiO_2$ nano-shell was fully coated on the surface of ${\alpha}$-alumina nanoplates; consequently, the synthesized effect pigments exhibited similar lustering effect and structuring color to commercial effect pigment. Under relatively acidic condition and higher $TiCl_4$ precursor concentration condition (3 M $TiCl_4$ aqueous solution : deionized water : HCl solution=0.75 mL : 20 mL : 0.05 mL for acidic condition and 1.0 or 1.5 mL : 20 mL : 0 mL for higher $TiCl_4$ precursor concentration condition), rougher $TiO_2$ shell was formed.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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