Issue 6, 2012
From the journal:

RSC Advances

Sol–gel TiO2 in self-organization process: growth, ripening and sintering

Hsueh-Shih Chen*a  and  Ramachandran Vasant Kumara  

* Corresponding authors

a Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge, CB2 3QZ, U.K
E-mail: sean.chen@cantab.net

Abstract

TiO2 nanoparticles were synthesised by a self-organization method using a continuous water vapour hydrolysis system without mixing. Formation of TiO2 particles was based on pure colloidal interactions of hydrolyzed alkoxide molecules generated at the interface between titanium alkoxide solution and water vapour. The effect of ethanol was proved to increase aggregation and packing of primary particles, leading to a significant size enlargement of secondary particles in a post annealing process above 500 °C. A new model to describe sol–gel TiO2 growth has been proposed, which considers the formation of secondary particles to be the result of nucleation of oversaturated primary particles, while the primary particles are the result of irreversible oligomerization of Ti oxo molecules.

Graphical abstract: Sol–gel TiO2 in self-organization process: growth, ripening and sintering

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Article information

DOI
https://doi.org/10.1039/C2RA00782G
Article type
Paper
Submitted
23 Sep 2011
Accepted
01 Dec 2011
First published
19 Jan 2012

RSC Adv., 2012,2, 2294-2301

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Sol–gel TiO2 in self-organization process: growth, ripening and sintering

H. Chen and R. V. Kumar, RSC Adv., 2012, 2, 2294 DOI: 10.1039/C2RA00782G

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