Abstract: By using hydrothermal method，the magnesium hydroxide and the basic magnesium chloride whiskers were prepared. XRD，SEM，TG and FT-IR were used to characterize the composition and morphology of the products. The effects of hydrothermal conditions including reactant concentration，reaction temperature，reaction time and surfactant on the morphology were investigated. The results showed that regular hexagonal nano-plates with a thickness of 20—50 nm and the combined rose ball nano-structures of magnesium hydroxide were prepared with low magnesium chloride concentration and a few ammonium hydroxide drops added amount，While the basic magnesium chloride whiskers of 0.5 μm diameter and 200 μm length were single crystall with high magnesium chloride concentration and few ammonium hydroxide drops added amount.

Key words: hydrothermal synthesis, magnesium hydroxide, basic magnesium chloride, hexagonal plate, rose ball, whiskers

摘要： 以六水氯化镁和氨水为原料，水热法合成出了氢氧化镁和碱式氯化镁晶须。利用XRD、SEM、TG、FT-IR对产物的组成和形貌进行表征，同时考察了原料浓度、反应温度、反应时间及表面活性剂对产物形貌的影响。结果表明，在低氯化镁浓度和一定氨水滴加量的条件下产物为厚度20～50 nm，具有规则形状的纳米六方片层及其组合玫瑰花球结构的氢氧化镁，增大氯化镁溶液浓度同时减小氨水滴加量产物为直径0.5 μm、长度200 μm的碱式氯化镁单晶。

关键词: 水热法, 氢氧化镁, 碱式氯化镁, 六方片层, 玫瑰花球, 晶须