丙三醇-变频微波-水热法制备氢氧化镁晶须

以MgCl₂·6H₂O和NaOH为原料, 采用丙三醇-变频微波-水热法制备了优质氢氧化镁晶须. 采用XRD, SEM和TEM进行了物相、粒度、晶体形貌和结构分析. 考察了丙三醇-变频微波-水热法工艺对氢氧化镁晶须晶形、结构及分散性的影响. 实验发现, 在水热反应体系中加入体积分数为15%的丙三醇, 用变频微波加热, 在180 ℃反应6 h, 可获得粒度分布均匀、晶形和分散性好、表面光滑及缺陷少的优质氢氧化镁晶须. 在透射电镜下估算晶须直径约为0.1～0.3 μm, 长度约为80～110 um. 初步分析了变频微波和丙三醇对氢氧化镁晶须生长的作用.

Preparation of Magnesium Hydroxide Whisker by Glycerol-Frequency Conversion Microwave-Hydrothermal Process

The magnesium hydroxide whisker with excellent quality was synthesized by glycerol-frequency conversion microwave-hydrothermal process with MgCl_2·6H_2O and NaOH as raw materials. The phase, granularity, structure of crystal morphology of whiskers samples were characterized by X-ray diffraction (XRD),scanning electron microscop ( SEM ) and transmission electron microscop ( TEM ). The effect of glycerol-frequency conversion microwave-hydrothermal process on the crystal form, structure and dispersive capability of magnesium hydroxide whisker was investigated. The results show that high quality magnesium hydroxide whiskers with symmetrical granularity, fine crystal form and dispersibility, glabrous surface, as well as little crystal defect are obtained when 15% ( volume fraction) of glycerol is added and heated at 180 ℃ for 6 h. TheTEM images show that the diameters of whiskers are about 0. 1-0. 3 μm and the length are about 802-110μm. The influence of glycerol and frequency conversion microwave on growth of magnesium hydroxide whiskeres was investigated primarily.