【摘要】 以MgCl2为原料,NaOH为沉淀剂,研究了它们的浓度配比、反应温度、晶化温度、晶化时间、晶化方式等因素对形成Mg(OH)2晶须的影响。结果表明,当n(MgCl2)∶n(NaOH)=1.20∶1.92、混合温度Tm=86℃、晶化温度Tc=100℃、晶化时间Time=5.5h时,可以得到发育不完全的初级Mg(OH)2晶须。若改用水热法晶化,可得到发育较好的Mg(OH)2晶须。在此基础上,若在NaOH溶液中加入一定量的有机溶剂OR(NaOH浓度不变)时,即可得到发育更完善的Mg(OH)2晶须。电子显微镜照片显示,粒子呈晶须形状,粒度分布均匀,分散性好,晶形好,纯度高。并对晶须生长机理进行了初步分析。更多还原

【Abstract】 MgCl2·6H2O was used as raw material. Sodium hydroxide was used as precipitator. Factors influencing the formation of Mg(OH)2 whisker, such as concentration ratio of MgCl2·6H2O to NaOH, reaction temperature, crystallization temperature, crystallization time, crystallization means were tested. Experimental results show that the preliminary and undergrown Mg(OH)2 whisker can be obtained under the conditions of n(MgCl2)∶n(NaOH)=1.20∶1.92, reaction temperature Tm=86 ℃, crystallization temperature Tc=100 ℃, crystallization time 5.5 h. Under the same conditions, better whisker can be obtained when hydrothermal crystallization is used. On this foundation, a perfect Mg(OH)2 whisker was achieved after the organic solvent was added into NaOH solution. The SEM reveals that the particle of Mg(OH)2 has whisker form with fine dispersive capability and perfect crystal form, as well as high purity and uniform particle size. The whisker growth mechanism was preliminarily analyzed.更多还原