Structure Determination of Spherical MCM‐41 Particles
Structure Determination of Spherical MCM‐41 Particles
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DOI：
10.1002/1521-4095(200109)13:17
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发表时间：
2001-09
影响因子：
29.4
通讯作者：
B. Pauwels;G. Tendeloo;Carla Thoelen;W. V. Rhijn;P. Jacobs
中科院分区：
文献类型：
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作者：
B. Pauwels;G. Tendeloo;Carla Thoelen;W. V. Rhijn;P. Jacobs
氮吸附测量表明，通过改进的Stber程序获得的模板直接艾德化材料通常具有窄的孔径分布。通过XRD对这些球形颗粒的表征揭示了可以被索引为六边形的衍射图案。扫描电子显微镜（SEM）证实颗粒的形态为球形。(19尽管有这些特征，一个关键的问题仍然存在：如何将六边形填充的孔阵列放置在球形颗粒中？本文采用氮吸附测量、SEM、XRD和透射使命电子显微镜（TEM）对二氧化硅（亚）微米球进行了研究。计算结果与常规MCM-41材料的实验结果一致。基于这些结果，提出并讨论了球形颗粒的孔有序化模型。在图1a中，球形MCM-41颗粒（MCM-41（SPH））的SEM图像显示其完美的球形形状，尺寸范围为0.2至1 μ m。党的平均规模-
Nitrogen sorption measurements show that template-direct- ed materials obtained via a modified Stber procedure typi- cally have a narrow pore-size distribution. The characteriza- tion of these spherical particles by means of XRD reveals a diffraction pattern that can be indexed as hexagonal. Scanning electron microscopy (SEM) confirms the morphology of the particles as spherical. (19,22) In spite of these characterizations, one crucial question remains: how can an array of hexagonally packed pores be placed in a spherical particle? In this commu- nication, (sub-)micrometer spheres of silica are investigated with nitrogen sorption measurements, SEM, XRD, and trans- mission electron microscopy (TEM). The results are com- pared with the experimental observations from conventional MCM-41 material. Based on these results, a model for the pore ordering of spherical particles is proposed and discussed. In Figure 1a, an SEM image of spherical MCM-41 particles (MCM-41 (SPH)) shows their perfectly spherical shape, with sizes ranging from 0.2 to 1 lm. The average size of the parti-