Synthesis of metallic gold colored α-Al2O3 nanoplate-TiO2 core-shell pigments with robust and photo-stable smooth TiO2 shell

Su Jin Lee, Myoung Sang You, Jin Kyoung Park, Bum Jun Park, Sang Hyuk Im

Research output: Contribution to journalArticle

Abstract

To synthesize non-corrosive metallic gold colored α-Al2O3 nanoplate-TiO2 core-shell pigments with controlled roughness, we systematically checked the morphological variation of the TiO2 shell with the mole ratio of TiCl4 and NaOH from 1: 1 to 1: 1.5, 1: 2, 1: 2.5, 1: 3, 1: 3.5, and 1: 4. The more increased mole ratio of TiCl4 and NaOH resulted in the smoother TiO2 shell due to the promoted formation of anatase TiO2 than that of the rutile one. By the heat-treatment of pigments at 500ºC, we could improve the adhesiveness between TiO2 shell and α-Al2O3 nanoplates without changing their topology and roughness. In addition, the α-Al2O3 nanoplate with the robust TiO2 by heat-treatment exhibited comparable photo-stability against photo-catalytic degradation by UV exposure compared with the commercially available α-Al2O3/TiO2 lustering pigment.

Original languageEnglish
Pages (from-to)390-397
Number of pages8
JournalApplied Chemistry for Engineering
Volume31
Issue number4
DOIs
Publication statusPublished - 2020 Aug

Keywords

  • Adhesiveness
  • Pigment
  • Roughness control
  • TiO shell
  • α-AlO nanoplates

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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