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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (16): 1533-1538.    下一篇

研究通讯

应用弦长度分布函数研究中孔分子筛的精细结构

徐耀*,1, 吴东1, 孙予罕1, 李志宏2, 吴中华2   

  1. (1中国科学院山西煤炭化学研究所 煤转化国家重点实验室 太原 030001)
    (2中国科学院高能物理研究所 同步辐射国家实验室 北京 100039)
  • 投稿日期:2006-12-25 修回日期:2007-05-07 发布日期:2007-08-28
  • 通讯作者: 徐耀

Application of Chord Length Distribution to Fine Structure Analysis of Mesoporous Sieves

XU Yao*,1; WU Dong1; SUN Yu-Han1; LI Zhi-Hong2; WU Zhong-Hua2   

  1. (1 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001)
    (2 Laboratory of Synchrotron Radiation, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039)
  • Received:2006-12-25 Revised:2007-05-07 Published:2007-08-28
  • Contact: XU Yao

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1021

被引次数

9

弦长度分布(chord length distribution, 简称CLD)可以用来描述几何对象(球形颗粒、柱状孔、薄片等)的大小、形状和空间排布等特点. 原理上, 弦长度分布正比于由小角散射所得的相关函数的二次微分, 因此可以由相对散射强度进行计算. 在结构研究中, 将实验所得弦长度分布与理论计算某种确定几何体所得高度准确的弦长度分布进行比较, 可以获知对象的特征几何结构. 本文以中孔氧化硅分子筛为研究对象, 介绍了弦长度分布的计算方法, 以此精确计算了中孔分子筛的孔径分布, 得到了分子筛表面有机官能化对孔径的影响规律.

关键词: 弦长度分布, 小角X射线散射, 中孔分子筛

Chord length distribution (CLD) could be used to describe the size, shape and arrangement of geometric figure, such as spheric particles, cylinder pore, thin sheets, etc. In principle, CLD is in proportion with the second derivative of correlation function obtained from small angle X-ray scattering (SAXS) and therefore can be calculated from the relative SAXS intensity. In structure research, the characteristics geometric information of particle can be obtained by comparing the experimental CLD from SAXS result and the theoretically predicted CLD with high precision. In this paper, with mesoporous molecular sieves as examples, the CLD method was introduced to calculate the size distribution of mesopores. The effect of surface organic functionaliztion of mseopores on pore size was also derived.

Key words: chord length distribution, small angle X-ray scattering, mesoporous molecular sieves