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Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK)

Changsha,China,10.16-10.18,2010

ISBN: 978-1-935068-41-9 Scientific Research Publishing, USA

E-Book 2313pp Pub. Date: October 2010

Category: Chemistry & Materials Science

Price: $360

Title: Size Tailoring of Nanocrystals Mg(OH)2 via Hydrothermal Method
Source: Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK) (pp 1835-1838)
Author(s): Yong-zai Wang, Center of Analysis and Testing, Shan Dong University of Technology, Zi Bo, China, 255049
Ying Fu, College of Chemical Engineering, Shan Dong University of Technology, Zi Bo, China, 255049
De Yao, College of Chemical Engineering, Shan Dong University of Technology, Zi Bo, China, 255049
Abstract: Nanocrystals Mg(OH)2 were prepared from precursors of Mg(NO3)2.6H2O and en (ethylenediamine) using a hydrothermal method. Powder X-ray diffraction and field scanning electron microscope were used to characterize the as-obtained products. It was shown that crystallite sizes and size distributions of Mg(OH)2 can be tailored simply by changing volume ratio of water: en. In a water-rich solvent mixture, en : water ≤5:10 (v/v), the crystallite sizes increased and size distribution narrowed with the increase in volume of en . In an en-rich mixture, en : water ≥5：5 (v/v), the crystallite sizes decreased with en addition. The size variation was interpreted as resulting from different rates of nucleation and growth of Mg(OH)2.
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