Morphology control of zeolite crystals by organic ligands

沸石是晶体多孔材料。多孔结构已被用于各种用途。沸石晶体的形态控制对这种多孔结构的利用至关重要。本研究考察了有机配体与反应物之间的络合物形成对l型沸石和硅石-1晶体形态的影响。尽管l型沸石容易呈棒状，但有机配体的加入提供了圆盘状晶体的形成。由于圆盘状晶体在表面有许多通道入口，它们是有用的催化剂和作为种子晶体的取向膜和膜的形成。同样，也合成了大的硅石-1晶体。这些大晶体对基础研究很有用，例如分析孔隙中吸附分子的状态和分子水平上的表面结构。

Zeolites are crystalline porous materials. The porous structures have been utilized for their various applications. Morphology control of zeolite crystals is important for such utilization of the porous structures. In this study, the influence of complex formations between organic ligands and reactants on crystal morphology was examined for L-type zeolite and silicalite-1. Despite the fact that L-type zeolite is prone to have a rod-like shape, the addition of organic ligands provided the formation of disc-like crystals. Since the disc-like crystals have many channel entrances on the surface, they are useful for catalysts and as the seed crystals for the formation of oriented films and membranes. Similarly, large silicalite-1 crystals were also synthesized. The large crystals are useful for fundamental studies, such as analyses of the state of adsorbed molecules in the pores and of the surface structure on the molecular level.