Fan Wei, O'Brien Matthew, Ogura Masaru, Sanchez-Sanchez Manuel, Martin Christopher, Meneau Florian, Kurumada Ken-Ichi, Sankar Gopinathan, Okubo Tatsuya
Department of Chemical System Engineering, The University of Tokyo, Tokyo, 113-8656, Japan.
Phys Chem Chem Phys. 2006 Mar 21;8(11):1335-9. doi: 10.1039/b510963a. Epub 2006 Feb 10.
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.
利用原位小角和广角X射线散射（SAXS/WAXS）技术研究了在四甲基铵阳离子存在下A型沸石（LTA）的形成。SAXS测量结果表明，在LTA结晶之前形成了尺寸为10 nm的均匀前驱体，这些前驱体在结晶过程中被消耗。通过用立方颗粒方程拟合SAXS图案来估计晶体尺寸，结果表明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存在这种温度依赖性，但初始前驱体颗粒尺寸似乎与合成温度无关，非常相似（约10 nm）。
