γ-AlOOH纳米棒的制备及其热分解
Preparation and Thermal Decomposition of γ-AlOOH Nanorods
摘 要
以氯化铝、氢氧化钠为原料,在反应溶液的pH值为5、反应温度为200 ℃的条件下用液相法制备薄姆石(γ-AlOOH)纳米棒;对其在不同温度下的煅烧产物及在加热过程的热分解过程进行了分析.结果表明:试验条件下能制备出直径10~30 nm、长度100~300 nm的γ-AlOOH纳米棒;该纳米棒在500~1 200 ℃下煅烧后转变为γ-Al2O3仍保持纳米棒的形貌;在1 250 ℃下煅烧后转变产物为α-Al2O3;在1 300 ℃下煅烧后转变产物为α-Al2O3,纳米棒相互烧结形成团聚体;γ-AlOOH纳米棒的热分解过程分为物理吸附水的脱出、化学吸附水的脱出、结构水脱出并转变为氧化铝中间相、氧化铝中间相中残留羟基的脱出四个阶段.
氧化铝
纳米棒
热分解
boehmite
alumina
nanorod
thermal decomposition
Abstract
Boehmite γ-AlOOH nanorods were prepared through liguid phase method at 200 ℃ in the solution with pH value of 5,using aluminum chloride and sodium hydroxide as raw materials.The products calcinated at different temperatures and the thermal decomposition of the products during heating were analyzed.The results show that γ-AlOOH nanorods with diameter of 10-30 nm and length of 100-300 nm could be obtained under the test condition.The nanorods transformed to γ-Al2O3 when they were calcinated at 500-1 200 ℃.The α-Al2O3 and θ-Al2O3 were generated at 1 250 ℃.The α-Al2O3 was generated at 1 300 ℃ and the nanorods formed aggregates after calcinating.The course of thermal decomposition of γ-AlOOH nanorods was divided into four stages,including desorption of physisorbed water,desorption of chemisorbed water,conversion into transition alumina and dehydration of transition alumina.
中图分类号 TQ174
所属栏目 纳米材料
基金项目 上海市重点学科建设资助项目(J51402)
收稿日期 2009/4/10
修改稿日期 2009/10/10
网络出版日期
作者单位点击查看
备注杨琪(1969-),男,湖南衡阳人,讲师,博士.
引用该论文: YANG Qi,HU Wen-bin. Preparation and Thermal Decomposition of γ-AlOOH Nanorods[J]. Materials for mechancial engineering, 2010, 34(5): 68～71
杨琪,胡文彬. γ-AlOOH纳米棒的制备及其热分解[J]. 机械工程材料, 2010, 34(5): 68～71
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【14】STACEY M H.Kinetics of decomposition of gibbsite and boehmite and the characterization of the porous products[J].Langmuir,1987(3):681-686.
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