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Kinetic model for transformation from nano-sized amorphous $TiO_2$ to anatase

Madras, Giridhar and McCoy, Benjamin J (2006) Kinetic model for transformation from nano-sized amorphous $TiO_2$ to anatase. In: Crystal Growth & Design, 7 (2). pp. 250-253.


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We propose a kinetic model for the transformation of nano-sized amorphous $TiO_2$ to anatase with associated coarsening by coalescence. Based on population balance (distribution kinetics) equations for the size distributions, the model applies a first-order rate expression for transformation combined with Smoluchowski coalescence for the coarsening particles. Size distribution moments (number and mass of particles) lead to dynamic expressions for extent of reaction and average anatase particle diameter, which are compared with experimental data [Chem. Mater. 2002, 14, 4145]. Data at different temperatures yield activation energies for coalescence and transformation rate coefficients, as well as an overall endothermic transformation energy for combined transformation and dehydration.

Item Type: Journal Article
Publication: Crystal Growth & Design
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Keywords: Solid-solid transformations;Amorphous titania;Anatase;Coarsening by coalescence
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 09 Feb 2007
Last Modified: 19 Sep 2010 04:34
URI: http://eprints.iisc.ac.in/id/eprint/9450

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