Effect of coating mixing conditions on the color tone of cobalt blue pigment having a core-shell structure obtained by solid phase synthesis of coated particles

Yuya Tatsumi, Mika Yoneda, Yasushi Mino, Koichi Nakaso, Kuniaki Gotoh, Toshiyuki Nomura

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A cobalt blue pigment having a core/shell structure was synthesized by solid phase synthesis of coated particles having Co(OH)2 particles adhered onto Al2O3 particles. In this research, the effect of mixing conditions on the color tone of synthesized pigment was investigated. As a result, it was found that the mixing time greatly affected the amount of adhered Co source particles, and the pressing force during mixing affected inhomogeneity of adhered amount of Co source particle on Al source particle surface. However, it was found that the inhomogeneity of the amount of Co source particles is small as the influence on the color tone of the calcinated product by diffusing onto the alumina surface of Co ions during calcination at high temperature. In addition, when the mixing conditions were not appropriate and the coating amount of the Co source particles on the Al source particles was small, the lightness of the product was high and the chroma was low. One reason for this is considered to be a decrease in the shell thickness generated by the decrease in the amount of Co source particles deposited. It was also suggested that the formation of black tri-cobalt tetroxide, which is an unreacted Co source not adhering to the Al source particles, is also the reason of the decrease of chroma of the product.

Original languageEnglish
Pages (from-to)165-170
Number of pages6
JournalJournal of the Society of Powder Technology, Japan
Volume55
Issue number3
DOIs
Publication statusPublished - Jan 1 2018

Keywords

  • Cobalt blue
  • Core-shell structure
  • Diffusion
  • Pigment
  • Solid phase synthesis

ASJC Scopus subject areas

  • Process Chemistry and Technology
  • Catalysis
  • Filtration and Separation
  • Fluid Flow and Transfer Processes

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