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Journal of Nanomaterials
Volume 2014, Article ID 856489, 8 pages
http://dx.doi.org/10.1155/2014/856489
Research Article

Study on the Size-Dependent Oxidation Reaction Kinetics of Nanosized Zinc Sulfide

Department of Applied Chemistry, Taiyuan University of Technology, Taiyuan 030024, China

Received 6 May 2014; Revised 16 July 2014; Accepted 24 July 2014; Published 26 August 2014

Academic Editor: Zhongkui Hong

Copyright © 2014 Qing-Shan Fu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Numerous oxidation problems of nanoparticles are often involved during the preparation and application of nanomaterials. The oxidation rate of nanomaterials is much faster than bulk materials due to nanoeffect. Nanosized zinc sulfide (nano-ZnS) and oxygen were chosen as a reaction system. The influence regularities were discussed and the influence essence was elucidated theoretically. The results indicate that the particle size can remarkably influence the oxidation reaction kinetics. The rate constant and the reaction order increase, while the apparent activation energy and the preexponential factor decrease with the decreasing particle size. Furthermore, the logarithm of rate constant, the apparent activation energy and the logarithm of preexponential factor are linearly related to the reciprocal of particle diameter, respectively. The essence is that the rate constant is influenced by the combined effect of molar surface energy and molar surface entropy, the reaction order by the molar surface area, the apparent activation energy, by the molar surface energy, and the preexponential factor by the molar surface entropy. The influence regularities and essence can provide theoretical guidance to solve the oxidation problems involved in the process of preparation and application of nanomaterials.