Synthesis of Nanosized Brrokite-type Tiatanium Dioxide Powder from aqueous TiOCl2 Solution by homogeneous Precipitation Reaction

Autor:	Yeong Seok Yang, Jeong Hoon Lee
Rok vydání:	2002
Předmět:	Anatase Aqueous solution Materials science Precipitation (chemistry) Brookite Inorganic chemistry Reaction rate chemistry.chemical_compound chemistry Rutile Phase (matter) visual_art Titanium dioxide visual_art.visual_art_medium General Materials Science
Zdroj:	Korean Journal of Materials Research. 12:947~954-947~954
ISSN:	2287-7258 1225-0562
DOI:	10.3740/mrsk.2002.12.12.947
Popis:	【HCl concentration and reaction time are the decisive factors in determining the structure of precipitates in the process of synthesis of $TiO_2$ particles from aqueous $TiOCl_2$ solution by precipitation and the volumetric proportion of brookite phase in $TiO_2$ particles can be controlled by these two factors. As reaction rate increases with increase of reaction temperature, the reaction time, at which maximum volumetric proportion of brookite phase in $TiO_2$ particles was obtained, was reduced. The brookite was transformed directly to rutile phase with only increase of reaction time. And precipitation was delayed with increase of HCl concentration because the amount of $H_2$ O, which is necessary source of oxygen for conversion of $Ti^{+4}$ to $TiO_2$ , was relatively reduced with increase of that. Brookite in the mixture phase powder was finally transformed to rutile phase via anatase through heat-treatment.】
Databáze:	OpenAIRE
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