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Imaging of Gas Molecules Adsorbed in the Mesoporous Material by the High Brilliance Synchrotron Powder Diffraction.

通过高亮度同步加速器粉末衍射对介孔材料中吸附的气体分子进行成像。

基本信息

批准号：
17510100
负责人：
KUBOTA Yoshiki
金额：
$ 2.3万
依托单位：
Osaka Prefecture University.
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17510100/
关键词：
Mesoporous Material X-ray Diffraction Gas Adsorption Structure Analysis 分子吸着

项目摘要

Mesoporous materials are amorphous materials without ordered structure on an atomic scale. The amorphous forms the pore structure of a meso scale. The arrangement and the rough shape of mesopores were investigated by the electron crystallography or X-ray diffraction to date. But no information on molecules adsorbed in the mesopore was revealed. The purpose of this research is to obtain the structural information of molecules adsorbed in the mesopores by the high brilliance synchrotron powder diffraction experiment and the maximum entropy method (MEM).The shape of mesopore of MCM-41 with a one-dimensional mesopore was analytically expressed using parameters of size, density, etc.. Comparing the simulated and observed diffraction intensities revealed the change of the size and shape of mesopores before and after calcination.The in-situ synchrotron powder diffraction experiment of gas adsorption was performed for MCM-48 with a three-dimensional mesopore.For the data without guest molecules, the combination of rough pore shape obtained by the conventional method and the pore volume estimated from the isotherm enabled us to scale the structure factors. The mesopore structure was successfully imaged by MEM. The MEM electron density distribution showed clear image and the size of the mesopore was found to be underestimated to date. This technique would be effective for the analysis of more complicated network and fine structure of pore surfaces.The gas adsorption process was observed as the change of electron density. The structural information on the gas adsorption process was able to be obtained, that is, the mono-layer adsorption state in the low pressure region, the capillary condensation in threshold value of pressure and the saturation adsorption state. Although the examination should be required for the treatment of phases, this technique is expected to be effective as the observation technique of a gas adsorption state.

介孔材料是在原子尺度上没有有序结构的无定形材料。无定形形成介观尺度的孔结构。迄今为止，通过电子晶体学或X射线衍射研究了介孔的排列和粗糙形状。但没有发现中孔吸附分子的信息。利用高亮度同步辐射粉末衍射实验和最大熵方法（MEM），对吸附在介孔中的分子进行结构信息的研究，并利用尺寸、密度等参数解析地描述了具有一维介孔的MCM-41的介孔形状。通过比较模拟结果和实际观察到的衍射强度，揭示了焙烧前后介孔尺寸和形状的变化。对具有三维介孔的MCM-48进行了气体吸附的原位同步辐射粉末衍射实验，对于不含客体分子的数据，通过常规方法获得的粗糙孔形状和从等温线估计的孔体积的组合使得我们能够缩放结构因子。利用微机电技术成功地对中孔结构进行了成像，微机电电子密度分布图像清晰，发现迄今为止中孔的尺寸被低估了。该技术可用于分析更复杂的孔表面网络和精细结构，并可通过电子密度的变化观察气体吸附过程。获得了气体吸附过程的结构信息，即低压区的单层吸附状态、临界压力区的毛细凝聚状态和饱和吸附状态。虽然对于相的处理需要进行检查，但是该技术作为气体吸附状态的观察技术预期是有效的。

项目成果

期刊论文数量（13）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Stabilization of the gamma phase in Fe-Pt alloy nanoparticles with low Pt contents prepared by chemical synthesis

化学合成法制备的低 Pt 含量 Fe-Pt 合金纳米颗粒中 γ 相的稳定化

DOI：
发表时间：
2006
期刊：
Mat. Sci. Eng. A 438-440
影响因子：
0
作者：
Tsugio Tadaki;Kouichi Kifune;Yoshiki Kubota;Hiroshi Yamaoka
通讯作者：
Hiroshi Yamaoka

Metastable sorption state of a metal-organic porous material determined by in situ synchrotron powder diffraction

DOI：
10.1002/anie.200600976
发表时间：
2006-01-01
期刊：
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
影响因子：
16.6
作者：
Kubota, Yoshiki;Takata, Masaki;Kobayashi, Tatsuo C.
通讯作者：
Kobayashi, Tatsuo C.

Formation and Characterization of Crystalline Molecular Arrays of Gas Molecules in a I-Dimensional Ultramicropore of a Porous Copper Coordination Polymer

多孔铜配位聚合物 I 维超微孔中气体分子晶体分子阵列的形成和表征

DOI：
发表时间：
2005
期刊：
J.Phys.Chem.B 109
影响因子：
0
作者：
Ryo Kitaura;Ryotaro Matsuda;Yoshiki Kubota;Susumu Kitagawa;Masaki Takata;Tatsuo C. Kobayashi;Megumi Suzuki
通讯作者：
Megumi Suzuki

An Analytical Approach to Determine the Pore Shape and Size of MCM-41 Materials from X-ray Diffraction Data

从 X 射线衍射数据确定 MCM-41 材料的孔形状和尺寸的分析方法

DOI：
发表时间：
2006
期刊：
J. Phys. Chem. B 110
影响因子：
0
作者：
Yoshiki Kubota;Masaki Takata;Ryotaro Matsuda;Ryo Kitaura. Susumu Kitagawa;Tatsuo C. Kobayashi;Kunio Hirata et al.;Yong-Tae Kim et al.;Eiji Nishibori et al.;Toshiyuki Matsunaga et al.;T.Sasaki et al.;H.Takagiwa et al.;Yoshiki Kubota et al.;Hitoshi Tanaka et al.;Eiji Nishibori et al.;Hiroshi Tanaka et al.;Shinji Kohara et al.;Eiji Nishibori et al.;Eiji Nishibori et al.;Norihiro Muroyama et al.
通讯作者：
Norihiro Muroyama et al.

Crystal structures and phase stability in pseudobinary CaAl2-xZnx

DOI：
10.1016/j.jssc.2006.05.018
发表时间：
2006-08
期刊：
Journal of Solid State Chemistry
影响因子：
3.3
作者：
K. Söderberg;M. Boström;Y. Kubota;T. Nishimatsu;R. Niewa;U. Häussermann;Y. Grin;O. Terasaki
通讯作者：
K. Söderberg;M. Boström;Y. Kubota;T. Nishimatsu;R. Niewa;U. Häussermann;Y. Grin;O. Terasaki