结晶
成核
范德瓦尔斯力
结晶水
Crystal(编程语言)
粒子(生态学)
材料科学
扩散
晶体生长
结晶学
化学工程
氢键
化学物理
矿物学
分子
化学
热力学
无机化学
有机化学
地质学
物理
计算机科学
工程类
海洋学
程序设计语言
作者
Wen He,Yusheng Wu,Yuzheng Wang,Laishi Li,Xiande Ma
标识
DOI:10.1016/j.jcrysgro.2023.127215
摘要
In this work, the crystallization kinetics of pseudoboehmite was studied by intermittent crystallization method. The kinetic model of pseudoboehmite process was established based on particle number equilibrium. The results show that the nucleation is mainly caused by crystal collision, the main speed control step is diffusion process, and the enlargement of crystals mainly originates from the growth. Reducing the temperature of system can obtain pseudoboehmite crystals which have larger particle size and more uniform particle size distribution. Two parallel octahedral units connected by hydroxyl groups are preferentially stacked along the (0 2 0) crystal plane. Excessive interlayer water molecules between (0 2 0) crystal planes lead to an increase in the interlayer distance. The increased distance between (0 2 0) layers will weaken the hydrogen bond between layers, as well as the electrostatic forces and van der Waals forces, resulting in the formation of folded layers with holes. Finally, the irregularly sheets of pseudoboehmite are stacked to form porous spherical structures.
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