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Journal of Nanomaterials
Volume 2013 (2013), Article ID 289616, 6 pages
http://dx.doi.org/10.1155/2013/289616
Research Article

Influence of the Mixing Ways of Reactants on ZnO Morphology

Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received 29 December 2012; Accepted 27 February 2013

Academic Editor: Guo Gao

Copyright © 2013 Lining Yang and Lan Xiang. 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

ZnO particles with various morphologies were synthesized by mixing ZnSO4 and NaOH solutions at 25°C followed by aging of the suspensions at 40–80°C for 2.0 h, keeping the initial molar ratio of Zn2+ to OH at 1 : 4. ZnO irregular plates were prepared by adding NaOH to ZnSO4 while -Zn(OH)2 rhombic particles were produced using the opposite mixing way. After aging of the slurries at 80°C for 2.0 h, the ZnO plates were kept stable while the -Zn(OH)2 rhombic particles were converted to ZnO whiskers with a length of 1.0–4.0 μm and a diameter of 0.03–0.3 μm. Thermodynamic analysis indicated that the formation of the Zn-bearing precipitates (ZnO or -Zn(OH)2) at room temperature was connected closely with the solution composition.