Influence of magnesium source on the crystallization behaviors of magnesium hydroxide
Influence of magnesium source on the crystallization behaviors of magnesium hydroxide
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镁源对氢氧化镁结晶行为的影响
DOI：
10.1016/j.jcrysgro.2008.05.032
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发表时间：
2008-08-01
影响因子：
1.8
通讯作者：
Wang, Dujin
中科院分区：
文献类型：
--
作者：
Gao, Yanyan;Wang, Haihua;Wang, Dujin
通过在30 ℃下缓慢扩散氨气，从氯化镁（MgCl 2）或十二烷基硫酸镁[Mg（DS）（2）]的水溶液中结晶氢氧化镁[Mg（OH）（2）]。以5.0 × 10（-3）mol/LMgCl 2水溶液为反应介质，反应2 d后得到了薄而分枝的向日葵形Mg（OH）（2）片层超结构，随着反应时间的延长和MgCl 2浓度的增加，Mg（OH）（2）片层的形成和团聚。有趣的是，5.0 × 10（-3）mol/L Mg（DS）（2）的水溶液可以被称为5.0 × 10（-2）mol/L MgCl 2在Mg（OH）（2）表面成核的对应物。透射电镜（TEM）观察发现，Mg（DS）（2）溶液中2 d和3 d的沉淀物为Mg（OH）（2）片晶的层状聚集体，而6 d和12 d的沉淀物为Mg（OH）（2）的柱状结构，表明Mg（OH）（2）片晶沿着垂直于[0 0 1]面的c轴进一步生长。同时，对Mg（OH）2在不同镁源水溶液中的成核、晶体取向和晶体缺陷进行了讨论，表明Mg（OH）2在不同镁源水溶液中具有不同的结晶习性。(c)2008 Elsevier B. V.保留所有权利。
The crystallization of magnesium hydroxide [Mg(OH)(2)] from the aqueous solutions of magnesium chloride (MgCl2) or magnesium dodecyl sulfate [Mg(DS)(2)] was conducted by means of the slowly diffusing of ammonia gas at 30 degrees C. When the aqueous solution of 5.0 x 10(-3) mol/L MgCl2 was used as a reaction medium, the sunflower-shaped superstructures of thin and branched Mg(OH)(2) sheets were obtained at 2 d; the prolongation of reaction time and the increase of MgCl2 concentration caused the formation and the consequent agglomeration of Mg(OH)(2) platelets. Interestingly, the aqueous solution of 5.0 x 10(-3) mol/L Mg(DS)(2) could be referred as the counterpart of 5.0 x 10(-2) mol/L MgCl2 at the surface nucleation of Mg(OH)(2). The precipitates sampled from Mg(DS)(2) solutions at 2 or 3 d presented the lamellar aggregates of Mg(OH)(2) platelets; while these sampled at 6 and 12 d showed the column-shaped structures of Mg(OH)(2) under the transmission electron microscopy (TEM) observation, suggesting the further growth of Mg(OH)(2) platelets along the c-axis perpendicular to the [0 0 1] face. Meanwhile, the nucleation, the crystal orientation, and the crystallographic defect were also discussed, indicating the different crystallization habits of Mg(OH)(2) in the aqueous solutions of different magnesium sources. (c) 2008 Elsevier B.V. All rights reserved.