Crystal growth of faujasite observed by atomic force microscopy
Crystal growth of faujasite observed by atomic force microscopy
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DOI：
10.1016/j.micromeso.2004.02.016
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发表时间：
2004-05
影响因子：
5.2
通讯作者：
T. Wakihara;A. Sugiyama;T. Okubo
中科院分区：
文献类型：
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作者：
T. Wakihara;A. Sugiyama;T. Okubo
采用原子力显微镜（AFM）揭示了八面沸石的晶体生长机制。观察到八面沸石在稀硅铝酸盐溶液中的晶种生长。制备了两种溶液：一种与种子接近平衡，另一种处于种子的生长模式。在种子的同一位置观察种子生长过程中的形态变化以及生长周期（异位观察）。这些观察结果表明，在与种子接近平衡的溶液中，种子的粗糙表面转变为有序的 (111) 面。这种表面排序是通过溶液和固相之间铝硅酸盐物质的相互转移和/或通过晶种上无定形物质的溶解来实现顶面结构的热力学稳定而进行的。在生长模式下，晶种的大部分顶面由双六元环（D6R）终止，而一些则由完整或不完整的方钠石笼终止。这些结果表明等于或小于6R的硅铝酸盐物种有助于晶体生长。
Atomic force microscopy (AFM) was employed to reveal the crystal growth mechanism of faujasite. The seeded growth of faujasite in dilute aluminosilicate solutions was observed. Two solutions were prepared: one was near equilibrium with the seed and the other was in growth mode for the seed. Morphological changes during the seeded growth were observed along with the growth period at the same position on the seed (ex situ observation). These observations showed the rough surface of the seed changing into a well-ordered (111) face in the solution that was near equilibrium with the seed. This surface ordering proceeded by thermodynamic stabilization of the top-surface structure via the mutual transfer of aluminosilicate species between the solution and solid phases, and/or by the dissolution of the amorphous matter on the seed. In growth mode, most of the top surfaces of the seeded crystals were terminated by double six-membered rings (D6Rs), while some were by complete or incomplete sodalite cage. These results showed that aluminosilicate species equal to or smaller than 6R contributed to the crystal growth.