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Journal of Nanomaterials
Volume 2015, Article ID 738909, 5 pages
http://dx.doi.org/10.1155/2015/738909
Research Article

The Standard Molar Enthalpies of Formation of Nano-ZnO Particles with Different Morphologies

College of Chemical Engineering, Beijing Institute of Petro-Chemical Technology, Beijing 102617, China

Received 17 November 2014; Accepted 29 December 2014

Academic Editor: Yoke K. Yap

Copyright © 2015 Ya Li and Xinmin Wu. 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

The thermodynamic properties of nano-ZnO particles with different morphologies were studied. First, based on the measurements of XRD and SEM, the morphologies of the five nano-ZnO products were determined as sheet, block, sieve, column, and rod, and their particle size was about 40 nm. Then, based on a designed thermodynamic cycle, the standard molar enthalpies of formation of the nano-ZnO particles were determined by the RD496-2000 microcalorimeter, and they are (sheet) =  kJmol−1, (block) =  kJmol−1, (sieve) =  kJmol−1, (column) =  kJmol−1, and (rod) =  kJmol−1. The results show that the bigger difference of the morphologies of nano-ZnO, the bigger difference of the standard molar enthalpies of formation.