材料科学与工程学报2011，Vol.29Issue(6)：833-839,7.
不同水热条件下的纳米γ-AlOOH聚集生长方式分析
Aggregative Growth Mode of Nano AlOOH under Hydrothermal Conditions
郝保红 1田庄 1方克明2
作者信息
- 1. 北京石油化工学院机械工程系,北京102617
- 2. 北京科技大学冶金学院,北京100083
- 折叠
摘要
Abstract
A hydrothermal intermediate product,AlOOH,was used as the study object to investigate the influences of hydrothermal temperature and time on the hydrothermal product through testing the grain size and shape of the product.The critical nucleation theory and grain growth theory were applied to explain the reason of grain shape reversion caused by improving the hydrothermal temperature and prolonging the hydrothermal time.It discloses two kinds of aggregative growth modes which are induced under the condition of improving the hydrothermal temperature,prolonging the hydrothermal time and increasing the supersaturation state of the precursor through combining the crystal growth stage theory.It also expounds the fundamental reasons of the class Ⅰ and Ⅱ of the aggregative growth,wherein the class Ⅰ of the aggregative growth refers to the superposition of Al3＋ aggregates on the surfaces of other grains,wherein part of AlOOH grains are dissolved in the hydrothermal solution to form the Al3＋ aggregates due to the increase of supersaturation degree.The nature of generating the aggregative growth of the classⅡ is that grains with special growth state are formed by a plurality of AlOOH grains through bond linkage of the compatible grain boundaries of certain structures in the pH acid and alkali processes.关键词
纳米/AlOOH/水热条件/聚集生长/第Ⅰ类聚集/第Ⅱ类聚集Key words
Nanometer/AlOOH/hydrothermal condition/aggregative growth/class Ⅰ of aggregation/Class Ⅱ of aggregation分类
通用工业技术引用本文复制引用
郝保红,田庄,方克明..不同水热条件下的纳米γ-AlOOH聚集生长方式分析[J].材料科学与工程学报,2011,29(6):833-839,7.
