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Alumina Surface Treated Pigmentary Titanium Dioxidewith Suppressed Photoactivity
Pages 51-58
N. Veronovski, M. Lešnik and D. Verhovšek

DOI: http://dx.doi.org/10.6000/2369-3355.2014.01.01.6

Published: 25 June 2014


Abstract: The aim of the optimization of the technological process was to coat the surface of the pigment in a controlled manner and to supress photoactivity in the titanium dioxide (TiO2) pigment. As part of this research, a systematic approach to TiO2 pigment surface treatment with alumina was conducted. Surface treatment with alumina plays a significant role in the improvement of TiO2 properties (e.g. weather resistance and photostability).This research encompasses a raw material analysis and process conditions study. Sodium aluminate and aluminium sulphate were used as a source of alumina hydroxide. The effectiveness of surface treatment was determined using scanning-transmission (STEM) and transmission (TEM) electron microscopy. The photoactivity of pigmentary TiO2 was determined before and after surface treatment. A controlled surface treatment process resulted in pigmentary TiO2 particles with uniform amorphous layers, which supressed the photoactivity of the pigment.

Keywords: Titanium dioxide, Surface treatment, Coatings, Alumina, Photo activity.


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