In situ observation of homogeneous nucleation of nanosized zeolite A
In situ observation of homogeneous nucleation of nanosized zeolite A
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DOI：
10.1039/b510963a
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发表时间：
2006-01-01
影响因子：
3.3
通讯作者：
Okubo, T
中科院分区：
文献类型：
--
作者：
Fan, W;O'Brien, M;Okubo, T
用原位小角和广角X射线散射（SAXS/WAXS）技术研究了四甲基铵阳离子存在下A型沸石（LTA）的形成。SAXS测量显示在LTA结晶之前形成尺寸为10 nm的均匀前体，其在结晶期间被消耗。晶体尺寸估计通过拟合的SAXS图案与立方粒子的方程，它揭示了LTA的最终晶体尺寸取决于合成温度。然而，尽管注意到最终晶体尺寸的这种温度依赖性，但初始前体颗粒尺寸似乎非常相似（约100 μ m）。10 nm），而与合成温度无关。
The formation of zeolite A ( LTA) in the presence of tetramethylammonium cations is studied using in situ small angle and wide angle X-ray scattering ( SAXS/WAXS) techniques. The SAXS measurements show the formation of homogeneous precursors 10 nm in size prior to the crystallization of LTA which were consumed during the crystallization. The crystal size is estimated by fitting the SAXS patterns with an equation for a cubic particle, and it is revealed that the final crystal size of the LTA depends on the synthesis temperature. However, although such temperature dependence is noted for the final crystal size, the initial precursor particles size appears to be closely similar ( ca. 10 nm) irrespective of the synthesis temperature.