Sol-Gel reactor with rapid micromixing: Modelling and measurements of titanium oxide nano-particle growth

We present a concept of the sol-gel reactor with injection of stock solutions through a T mixer, environmental gas control, thermal control of the reactive medium and in-situ particle size measurement using a monomode optical fibre probe. The rapid injection of the whole amount of reagents leads to...

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Bibliographic Details
Published in:Chemical engineering research & design 2005, Vol.83 (1), p.67-74
Main Authors: RIVALLIN, M, BENMAMI, M, KANAEV, A, GAUNAND, A
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Engineering Sciences
Exact sciences and technology
Other
Reactors
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Summary:We present a concept of the sol-gel reactor with injection of stock solutions through a T mixer, environmental gas control, thermal control of the reactive medium and in-situ particle size measurement using a monomode optical fibre probe. The rapid injection of the whole amount of reagents leads to short time of nucleation, and the micro-mixer eliminates gradients of concentrations, which results in higher local nucleation and aggregation rates. The reactor is used for production of mono-disperse nanometric titanium oxide sols. With this reactor, induction kinetics are reproducible and agree with a model describing the mean particle size increase by a slow aggregation process. As well as the in-situ size measurement technique, the reactor is a kinetic tool for determination of the sol aggregation rate. As the rules for scale-up of its equipment are already established, it is of interest for the operation and the design of industrial-scale sol-gel reactors.
ISSN:0263-8762
1744-3563
DOI:10.1205/cherd.03073