沉淀法制备单分散纳米Al(OH)_3先驱沉淀物  

Preparation of Nanocrystalline Monodispersed Al(OH) 3 Precursor Precipitates

作　　者：英宏[1] 李继光[1] 赵志江 李晓东[1] 修稚萌[1] 孙旭东[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110006 [2]辽宁省分析测试研究中心,沈阳110015

出　　处：《东北大学学报（自然科学版）》1999年第5期515-518,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金;辽宁省自然科学基金

摘　　要：研究了以硝酸铝和氨水为原料，采用沉淀法制备单分散纳米Ａｌ（ＯＨ）３ 先驱沉淀物的工艺·结果表明，采用通常的物料等速滴加方法得到的Ａｌ（ＯＨ）３ 沉淀物或颗粒粗大、或尺寸分布范围宽·发明了变速滴加制备单分散纳米Ａｌ（ＯＨ）３ 先驱沉淀物的工艺，即首先通过缓慢滴加将０－２ ｍｏｌ·Ｌ－１Ａｌ（ＮＯ３）３ 溶液的ｐＨ 值调整到５－５ ，然后以２５ ｍｌ·ｍｉｎ －１ 的速度向Ａｌ（ＮＯ３）３ 溶液中快速滴加浓度为４－５ ｍｏｌ·Ｌ－ １ 的ＮＨ４ＯＨ 溶液，获得了颗粒尺寸小于５ ｎｍ ，尺寸均匀的Ａｌ（ＯＨ）３Synthesis of nanocrystalline monodispersed Al(OH) 3 precursor precipitates by precipitation method using aluminum nitrate and ammonia hydrate as the starting materials was investigated. The results show that the Al(OH) 3 precipitates obtained using the conventional constant rate addition of the reaction solution have large particle diameters and/or broad size distribution. A synthesizing route with the varied adding rate was invented, that is adjusting the pH value of a Al(NO 3) 3 (0 2?mol·L -1 ) solution to 5 5 by a slow adding rate in the begining, and then rapidly adding NH 4OH (4.5 mol·L -1 ) solution with a rate of 25?ml·min -1 . Using this method, monodispersed Al(OH) 3 precursor precipitates with a particle size of 5 nm were produced.

关 键 词：纳米粉 单分散 先驱沉淀物 沉淀法 氢氧化铝 

分 类 号：TQ133.1[化学工程—无机化工] TF123.72[冶金工程—粉末冶金]