Direct Evidence of the Evolutionary Mechanism of Zeolite Monolayers on the Substrate Surface in a Hydrothermal Reaction
Direct Evidence of the Evolutionary Mechanism of Zeolite Monolayers on the Substrate Surface in a Hydrothermal Reaction
复制标题
水热反应中基底表面沸石单层演化机制的直接证据
DOI：
10.1021/la903850r
复制
发表时间：
2010-04-20
期刊：
影响因子：
3.9
通讯作者：
Zhang, Baoquan
中科院分区：
文献类型：
--
作者：
Lang, Lin;Liu, Xiufeng;Zhang, Baoquan
The microstructure control and optimization of zeolite films and membranes is an indispensable challenge for various in applications. It can he steered by understanding the formation process. Here we design an unprecedented strategy to uncover direct evidence via the hydrothermal synthesis of chitosan-supported zeolite monolayers. The chitosan-supported layer involved in the hydrothermal reaction is observed using SEM, AFM, EPMA, and HRTEM while nucleation and crystal growth in the hulk synthesis solution are pursued with HRTEM, IDES, and SEM. The direct H RTEM observation is achieved on the chitosan-supported layer by peeling chitosan from its support. It reveals that a gel layer is initially formed on the chitosan layer where the subsequent crystal growth is fatally restrained. Our own experimental evidence and the literature reports clearly demonstrate that the formation mechanism is homogeneous for severely reduced crystal growth on the substrate hut is heterogeneous when crystal growth on the substrate is significantly enhanced.
