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Advanced electron microscopy characterization for pore structure of mesoporous materials; a study of FDU-16 and FDU-18
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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2011 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 21, no 35, 13664-13671 p.Article in journal (Refereed) Published
Abstract [en]

We present a comprehensive analysis for pore structures of cage-type ordered mesoporous carbons (OMCs) using various electron microscopy techniques in addition to conventional nitrogen adsorption isotherm studies. The benefits and drawbacks of these techniques are evaluated, and it is shown that they are complementary to each other. Knowledge of the structural properties, pore sizes, and connectivity gives insight into the synthesis strategies and how they are affecting the material properties that are useful within the possible applications. Herein, focus is put on the two OMCs with Im (3) over barm and Fm (3) over barm symmetries specified by FDU-16 and FDU-18. The central techniques used in this study are high resolution scanning electron microscopy combined with cross-section polisher and three-dimensional reconstruction methods (electron tomography and electron crystallography) based on transmission electron microscopy observations.

Place, publisher, year, edition, pages
2011. Vol. 21, no 35, 13664-13671 p.
National Category
Materials Chemistry Physical Chemistry
Research subject
Structural Chemistry
Identifiers
URN: urn:nbn:se:su:diva-66876DOI: 10.1039/c1jm11789kISI: 000294176600072OAI: oai:DiVA.org:su-66876DiVA: diva2:468959
Note
7Available from: 2011-12-22 Created: 2011-12-21 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Characterizing cavity containing materials using electron microscopy: A study of metal oxides, mesoporous crystals and porous material containing nanosized metal-particles
Open this publication in new window or tab >>Characterizing cavity containing materials using electron microscopy: A study of metal oxides, mesoporous crystals and porous material containing nanosized metal-particles
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis concerns the characterization of novel materials by utilizing electron microscopy techniques. The examined materials contain cavities with certain attributes that enables desired properties for applications such as gas separation, catalysis and fuel cells. The specimens concerned herein belong to the following groups of materials: Metal oxides in the Sb-W-Mo-O system; ordered mesoporous silicas and carbons; hollow spheres containing Au-nanoparticles; zeolite LTA incorporated with mesopores; metal organic frameworks doped with nickel.

With scanning electron microscopy (SEM) and transmission electron microscopy (TEM) you get vast possibilities within the field of characterization. This thesis utilizes conventional electron microscopy techniques such as imaging, energy-dispersive spectroscopy and electron diffraction as well as reconstruction techniques, such as exit-wave reconstruction, electron tomography and electron crystallography. Furthermore, the sample preparation technique cross-section polishing has been used in conjunction with low voltage SEM studies.

The scientific approach is to gain knowledge of nano-sized cavities in materials, in particular their shape, size and content. The cavities often have irregularities that originates from the synthesis procedure. In order to refine the synthesis and to understand the properties of the material it is required to carefully examine the local variations. Therefore average characterization techniques such as crystallography needs to be combined with local examination techniques such as tomography. However, some of the materials are troublesome to investigate since they to some extent bring limitations to or gets easily damaged by the applied characterization technique. For the development of novel materials it is essential to find means of overcoming also these obstacles.

Place, publisher, year, edition, pages
Stockholm: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2011. 84 p.
Keyword
Electron microscopy
National Category
Inorganic Chemistry Materials Chemistry
Research subject
Structural Chemistry
Identifiers
urn:nbn:se:su:diva-64164 (URN)978-91-7447-247-9 (ISBN)
Public defence
2012-01-20, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 13:15 (English)
Opponent
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Note
At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 6: Submitted.Available from: 2011-12-15 Created: 2011-11-11 Last updated: 2012-03-26Bibliographically approved

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