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Modeling of Spray Pyrolysis-Why are the Synthesized Y2O3 Microparticles Hollow?

Reuge, Nicolas and Caussat, Brigitte and Joffin, Nicolas and Dexpert-Ghys, Jeannette and Verelst, Marc and Dexpert, Henri Modeling of Spray Pyrolysis-Why are the Synthesized Y2O3 Microparticles Hollow? (2007) AIChE Journal, vol. 54 (n° 2). pp. 394-405. ISSN 0001-1541

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Official URL: http://dx.doi.org/10.1002/aic.11375

Abstract

There are some major advantages to be gained in processing micronic europium doped yttrium oxide Y2O3 particles for phosphor applications using spray pyrolysis. To better understand the influence of the operating conditions and also why hollow particles are formed, a complete one-dimensional modeling of the pure evaporation then evaporation/precipitation steps of micronic water/Y(NO3)3 droplets has been performed. Among the main results, it appears that no concentration gradient exists inside droplets during the pure evaporation stage and that the evaporation/precipitation stage, occurring in less than 1023 s, leads to compact particles theoretically formed of a coherent porous medium of Y(NO3)35H2O. But the analysis of phenomena occurring during the thermolysis step between 95 and 3008C has revealed that a partial liquefaction of the hydrated yttrium nitrate occurs with concomitant release of gas. As a consequence, a crust of lightly hydrated yttrium nitrate probably appears, followed by particle inflation and leading to the formation of broken hollow particles.

Item Type:Article
Additional Information:Thanks to Wiley-Blackwell editor. The definitive version is available at www3.interscience.wiley.com - The definitive version is available at http://onlinelibrary.wiley.com/doi/10.1002/aic.11375/abstract;jsessionid=99BE3E8E160D9A081F2784077E43D571.d01t02
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: Hélène Dubernard
Deposited On:21 Oct 2008 09:58

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