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Evolution of rutile TiO2 coating layers on lamellar sericite surface induced by Sn4+ and the pigmentary properties
- Source :
-
Powder Technology . Dec2010, Vol. 204 Issue 2/3, p249-254. 6p. - Publication Year :
- 2010
-
Abstract
- Abstract: Rutile TiO2-coated sericite powders were prepared by the chemical deposition method starting from lamellar sericite and TiCl4 in the presence of Sn4+. After calcination at 850°C for 4h, TiO2 nanolayers in rutile phase were formed on the sericite surfaces. The presence of Sn4+ induced the phase transformation of amorphous to rutile TiO2, giving the formation of TiO2 nanolayers composed of small-sized rutile TiO2 nanoparticles. XPS analysis shows that Sn4+ cations were anchored at the sericite surfaces by formation of Al–O–Sn and Si–O–Sn bonds, and the aluminum and silicon sites on the sericite surfaces were dominantly occupied by Sn4+ cations. TiO2 coating layers were subsequently anchored at the sericite surfaces via Ti–O–Sn bonds. The TiO2-coated sericite powders had higher light scattering indexes than the naked sericite powders. The brightness, whiteness, and light scattering index of the rutile TiO2-coated sericite powders were slightly higher than those of the anatase TiO2-coated sericite powders. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00325910
- Volume :
- 204
- Issue :
- 2/3
- Database :
- Academic Search Index
- Journal :
- Powder Technology
- Publication Type :
- Academic Journal
- Accession number :
- 53970662
- Full Text :
- https://doi.org/10.1016/j.powtec.2010.08.009