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Chemical Vapor Synthesis of Zinc Oxide Nanoparticles: Experimental and Preliminary Modeling Studies

Reuge, Nicolas and Bacsa, Revathi and Serp, Philippe and Caussat, Brigitte Chemical Vapor Synthesis of Zinc Oxide Nanoparticles: Experimental and Preliminary Modeling Studies. (2009) Journal of Physical Chemistry C, vol. 1 (n° 46). pp. 19845-19852. ISSN 1932-7447

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Official URL: http://dx.doi.org/10.1021/jp9070955

Abstract

The chemical vapor synthesis of ZnO tetrapods from zinc metal has been studied using a combination of experiments and fluid dynamics modeling. On one hand, an experimental study allowed production of ultrapure ZnO particles whose mean lengths (250-450 nm) and diameters (14-27 nm) depended on the reactor configuration (i.e., parallel flow/crossflow), but not on the position of air injection. On the other hand, the yield of the reaction depended both on the reactor configuration and on the position of air injection. We then developed an original kinetic model implemented in the computation fluid dynamics code FLUENT. Within the limits of certain assumptions, the model successfully predicts the experimental yield of the reaction for all the conditions tested. This good agreement shows that the kinetics of nucleation/growth of ZnO nanoparticles are probably very rapid compared to the reaction of oxidation of Zn vapor. The combination of the experimental and simulated results led to a better understanding of the heat- and mass-transfer phenomena involved. Finally, several processing parameters, such as argon and air flow rates, position of air injection, and reactor diameter, were varied in the simulations to find optimized reaction conditions for maximum yield and production rate. For the crossflow configuration, a yield of 71% and a production rate 7 times higher than the nominal value have been obtained.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Brigitte CAUSSAT-BONNANS
Deposited On:07 Jun 2010 15:57

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