Characterization of colloidal chromia particles obtained by forced hydrolysis

Colloidal particles of chromia have been prepared by forced hydrolysis of an aqueous solution containing chromium chloride hexahydrate. At elevated temperature, a controlled addition of potassium hydroxide yielded colloidal chromia particles. After the sol coagulation, amorphous dried residues (I) w...

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Bibliographic Details
Published in:Materials research bulletin 2003-07, Vol.38 (8), p.1329-1339
Main Authors: Onjia, A.E., Milonjić, S.K., Čokeša, Dj, Čomor, M., Miljević, N.
Format: Article
Language:English
Subjects:
A. Oxides
B. Sol-gel chemistry
Chemistry
Colloidal state and disperse state
D. Surface properties
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
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Summary:Colloidal particles of chromia have been prepared by forced hydrolysis of an aqueous solution containing chromium chloride hexahydrate. At elevated temperature, a controlled addition of potassium hydroxide yielded colloidal chromia particles. After the sol coagulation, amorphous dried residues (I) were converted to crystalline form (II) by heating at 1073 K. The thermal treatment was also accompanied by a reduction in both surface area (from 75 to 9 m 2/g) and point of zero charge (pH pzc; from 4.7 to 4.0). Chromia dissolution over the studied pH range (pH=2–12) exhibits a parabolic trend, with minimum solubility at pH pzc.
ISSN:0025-5408
1873-4227
DOI:10.1016/S0025-5408(03)00137-5