摘 要：以氯化镁和尿素为原料，采用均匀沉淀法制备出厚度约为 20 nm 的片状纳米氢氧化镁粉体。利用热重分析法对片状纳米氢氧 化镁粉体在不同升温速率下的热分解动力学进行研究，以期深入认 识由纳米氢氧化镁粉体热分解得到纳米氧化镁粉体过程的物理化 学本质。分别采用 Coats- Redfern 方程和 Dolye 方程，对热重分析数 据进行了处理和拟合，得到了片状纳米氢氧化镁粉体热分解反应属 于 Avrami- Erofeev(n=1)的成核和生长为控制步骤的反应机理，其 表观活化能 E=131 kJ/mol，指前因子 A=1.56×10¹⁰。 

关键词：纳米粉体；氢氧化镁；热重分析；热分解；动力学

Abstract: Taking magnesium chloride and urea as raw materials, sheet magnesium hydroxide nano-particles were prepared by homogeneous precipitation process. By using the thermal gravimetric analysis, the thermal decomposition of magnesium hydroxide nano-particles was studied at different heating rates for a deep understanding of the physi cal chemistry inbeing in this process which led to forming of magne sium oxide nano-particles. The Coats- Redfern and Dolye equations were used to do curve fitting. The computable results of kinetics of acti vation energy and pre-exponential were determined. It was that the ac tivation energy =131 kJ/mol，pre-exponential=1.56×10¹⁰. Decomposi tion reaction of magnesium hydroxide nano-particles was controlled by Avrami- Erofeev random nucleation and subsequent growth mechanism. 

Keywords: nano-particles；magnesium hydroxide；thermal gravim etric analysis；thermal decomposition；kinetics