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http://dx.doi.org/10.9713/kcer.2016.54.3.299

Synthesis Characteristics of ZnO Powder from Precursors Composed of Nitrate-Citrate Compounds  

Yang, Si Woo (Department of Chemical Engineering, Chungnam National University)
Lee, Seung Ho (Department of Chemical Engineering, Chungnam National University)
Lim, Dae Ho (Department of Chemical Engineering, Chungnam National University)
Yoo, Dong Jun (Department of Chemical Engineering, Chungnam National University)
Kang, Yong (Department of Chemical Engineering, Chungnam National University)
Publication Information
Korean Chemical Engineering Research / v.54, no.3, 2016 , pp. 299-304 More about this Journal
Abstract
Characteristics of self-propagating reaction for the preparation of ZnO powder from precursors composed of nitrate and citrate compounds were examined. The ratio of C/N was maintained in range of 0.7~0.8 to initiate the self-propagating reaction between the reducing citrate and oxidizing nitrate groups. The samples were decomposed thermally by using TGA. The sudden decomposition occurred in the range of X > 0.5 in a very short time with a very sharp decrease of mass, indicating that the self-propagating reaction would occur. Friedman, Ozawa-Flynn-Wall and Vyazovkin methods were employed to predict the activation energy, reaction order and frequency factor of the reaction rate in the rate determining step of X < 0.5 range. The activation energy increased with increasing fractional conversion in the range of 46~130 (kJ/min). The reaction order decreased in the range of 2.9~0.9, while the frequency factor increased in the range of 85~278 ($min^{-1}$), respectively, with increasing the rate of temperature increase.
Keywords
Self-propagating reaction; Activation energy; Reaction order; Frequency factor; ZnO powder; Nitrate-Citrate precursor;
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Times Cited By KSCI : 4  (Citation Analysis)
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