Stability of zircon pigments in water and diethylene glycol media: The case of turquoise V-ZrSiO4

Akdemir S., ÖZEL E., SUVACI E.

CERAMICS INTERNATIONAL, vol.39, no.2, pp.1909-1915, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 39 Issue: 2
  • Publication Date: 2013
  • Doi Number: 10.1016/j.ceramint.2012.08.040
  • Journal Name: CERAMICS INTERNATIONAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1909-1915
  • Keywords: Suspension, Colour, Silicates, Pigments, SOLUBILITY, ADSORPTION, CHARGE, OXIDE, PH
  • Anadolu University Affiliated: Yes

Abstract

The stability of pigment particles can be affected by physico-chemical interactions between the pigment particles and a solvent. In this study, the surface charges and stabilities of blue V-ZrSiO4 pigments in aqueous (water) and non-aqueous (diethylene glycol) suspensions were investigated. As a function of pH, the isoelectric points (IEP) for the commercial and synthesised pigments were determined to be 2.2 and 1.7, respectively. ICP-OES results show that the cations of V-ZrSiO4 pigments dissolve in both aqueous and non-aqueous systems. The dissolution of the pigment particles was more significant in DEG because the total ion concentration (> 2000 ppm) was higher than that of the aqueous medium (> 200 ppm). The colour stability of the V-ZrSiO4 powder deteriorates as a consequence of an insufficient chemical stability both in the water and DEG media. Additionally, the V-ZrSiO4 particles dissolve with proton-promoted and hydroxyl-promoted dissolution mechanisms in the aqueous medium, whereas these particles dissolve with a ligand-promoted dissolution mechanism in the non-aqueous medium. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.