4.6 Article

Study of the synthesis and crystallization kinetics of magnesium hydroxide

Journal

MATERIALS CHEMISTRY AND PHYSICS
Volume 162, Issue -, Pages 734-742

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2015.06.048

Keywords

Inorganic compounds; Crystal growth; Precipitation; Chemical techniques; Electrical characterization (conductivity); Electron microscopy (SEM)

Funding

  1. National Natural Science Foundation of China [20971088, 21471102, 51174138]
  2. University of North Texas [GA9023]

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The crystallization kinetics of magnesium hydroxide in low concentration solutions has been studied using an electrical conductivity method. Using various experimental relationships, several kinetic factors could be determined during the nucleation and growth process. From measurements of ion concentrations at various temperatures, the induction period of nucleation could be determined. As concentration and temperature increase, the crystallization rate increases affecting the nucleation and crystal growth of Mg(OH)(2). The crystal-solution interfacial surface tension was also calculated and shown to be affected by the magnesium anion source. The results show that a uniform particle size distribution of nuclei is formed during the initial homogeneous nucleation process and the nucleation and crystal growth rates can be represented by a first order reaction equation. Through the study of crystallization kinetics, a control strategy is proposed to synthesize a uniform particle size distribution of magnesium hydroxide. (C) 2015 Elsevier B.V. All rights reserved.

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