以MgSO4和NaOH为原料,采用常温合成-水热反应方式制备出直径0.5-1.0μm、长30-50μm的碱式硫酸镁(5Mg(OH)2·MgSO4·3H2O)晶须。电导率实验表明:添加氢氧化镁可显著提高硫酸镁水热溶液的电导率,由此初步推测晶须的水热合成属溶解-结晶机制:氢氧化镁首先溶解,然后溶液中Mg2+、SO42-和OH-发生反应生成碱式硫酸镁晶须。晶须的水热合成过程受晶体生长控制,宏观动力学方程为:-dc/dt=0.438(c-0.417)4
Magnesium oxysulfate whiskers (5Mg(OH)2·MgSO4·3H2O) with a diameter of 0.5--1.0μm
and a length of 30--50μm were synthesized via precipitation in room temperature followed with the hydrothermal reaction, using MgSO4 and NaOH
as the raw materials. The experimental results indicate that the addition of magnesium hydroxide increases the specific conductance of the magnesium sulfate
hydrothermal solution obviously, implying that magnesium oxysulfate whiskers may be formed via the dissolution of Mg(OH)2 followed with the interaction
of Mg2+, SO42- and OH^- ions. The hydrothermal process of the whiskers is controlled by the crystal growth step and the corresponding
kinetic model is as follows: -dc/dt=0.438(c-0.417)4.
参考文献
| [1] | 袁建君, 方琪, 刘智恩. 材料科学与工程, 1996, 14 (4): 1--7. [2] 梅村纯郎, 崛道忠男, 山口修二, 等. 日本公开特许公报, 昭-149318, 1981. [3] Otaka S, Mataunami T, Tasaka Y. US Patent, 5326548, 1994. [4] 董殿权, 王军, 杨静漪, 等. 功能材料, 1999, 30 (5): 559--560. [5] 魏钟晴, 马培华, 保积庆, 等. 盐湖研究, 1997, 5 (3-4): 16--23. [6] Ding Y, Zhang G T, Zhang S Y, et al. Chemical Material, 2000, 12: 2845--2852. [7] 岳涛, 高世扬, 朱黎霞, 等. 无机化学学报, 2002, 18 (3): 313--315. [8] 梁英教, 车昌荫. 无机物热力学手册. 沈阳: 东北大学出版社, 1993. 573--574. [9] 高世扬, 陈学安, 夏树屏. 化学学报, 1990, 48 (11): 1049--1055. |
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