首页|Hydrothermal crystallization of clathrasils in acidic medium: Energetic aspects
Hydrothermal crystallization of clathrasils in acidic medium: Energetic aspects
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NSTL
Elsevier
A series of clathrasils, including AST, DOH, MTN, and DDR topologies, was synthesized in an acidic medium. The general composition of the initial system was 1 SiO2: 0.3-0.5 SDA: 0.1-0.5 HF/NH4F: 0-0.3 HBr: 10-50H(2)O in the pH range of 2-6, where SDA stands for organic amines or ammonium ions as the structure-directing agents. And the hydrothermal syntheses were performed in the 150-200 degrees C temperature range. Besides elaborating the synthesis recipes and product characterizations, the study also attempted to elucidate the origins of slow crystallization kinetics. It was found that the thermodynamic stabilities of the SDA@Framewrok-SiO2 compounds play an overwhelming role in the crystalline phase selection. The finding of this study can be used as a guidance of silica-based porous materials synthesis under acidic conditions.
NSTL
Elsevier
