作　　者： ; ; ; ; ;

机构地区： 华东师范大学理工学院化学系

出　　处： 《应用化学》 2006年第10期1145-1149,共5页

摘　　要： 以苹果酸和硝酸镁为原料,采用溶胶-凝胶法（sol-gel）制备了氧化镁纳米晶。根据制备条件的不同,粒径可在7-20 nm之间。采用傅立叶红外光谱、热分析、X射线衍射、透射电子显微镜测试技术对凝胶的组成和热分解过程,凝胶和样品的物相组成以及样品的形貌、粒径大小、分布情况进行了分析;考察了原料配比、煅烧温度和时间、溶液初始pH值、乙醇用量对样品形貌和粒径的影响。结果表明,硝酸镁与苹果酸的摩尔比为1∶1.5,煅烧温度在500-700℃,煅烧时间为3 h,溶液初始pH值在3-7,V（乙醇）∶V（水）=1∶4时为最佳反应条件;紫外可见光谱（UV-V is）分析表明,纳米氧化镁的紫外屏蔽性能优于普通的氧化镁粉体。 The magnesium oxide nanocrystallites were prepared by means of a sol-gel method with malic acid and magnesium nitrate as raw materials. Under different preparing conditions, the particle size can vary from 7 nm to 20 nm. The intermediate gel and final product were characterized by FI-IR, TG-DTA, XRD and TEM. The effects of the ratio of the raw materials, calcined temperature and time, the initial pH value and the amount of ethanol on the particle size and morphology of the sample were analyzed. The results show that the conditions of the molar ratio of Mg^2 ＋ to malic acid being 1 ： 1.5, calcined temperature 500 - 700 ℃, calcined time 3 h, the initial pH value 3 - 7 and the volume ratio 1 ： 4 are favorable for the formation of nanosized magnesium oxide. The UV-Vis Spectra show that the UV-shielding capacity of the nanosized magnesium oxide is better than that of normal magnesium oxide.

关 键 词： 苹果酸 纳米氧化镁 紫外屏蔽 溶胶 凝胶法

领　　域： [理学] [理学]