Mahata, S and Kundu, Debtosh (2009) Hydrothermal synthesis of aqueous nano-TiO(2) sols. Materials Science-Poland, 27 (2). pp. 463-470. ISSN 0137-1339

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Abstract

A poorly crystalline nano-anatase precursor with the crystallite sizes of about 3.5 nm was prepared via reprecipitation of nano-anatase at pH = 7.0 from a highly transparent sol obtained by acidic peptization of hydrous titania precipitates, hydrolysed product of titanium isopropoxide. The weakly agglomerated nano-anatase precursor has been used for preparing well crystalline nano-TiO(2) sols by hydrothermal treatment at pH = 9.5 using a weak base, NH(4)OH. The crystallite size gradually grew with increasing temperature and reached 7.6 nm (X-ray) at 175 degrees C after 4 h of hydrothermal treatment. The sizes of particles were mostly in the range 5-15 nm. The hydroxyl content in the nano-TiO(2) decreased with increasing hydrothermal temperature of treatment and supported a gradual growth of nano-TiO(2) as evident from the X-ray and TEM.

Item Type:	Article
Uncontrolled Keywords:	Nano-TiO(2) sol; Peptization; Hydrothermal treatment
Subjects:	Engineering Materials
Divisions:	Sol Gel
Depositing User:	Bidhan Chaudhuri
Date Deposited:	27 Feb 2012 11:32
Last Modified:	27 Feb 2012 11:32
URI:	http://cgcri.csircentral.net/id/eprint/1032

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