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X-ray and FIB Tomography of Extremely High Surface Area Nanostructured Hollow Fiber Membranes

Published online by Cambridge University Press:  27 February 2012

Amy J. Grano ,
Franchessa M. Sayler ,
Amber Genau ,
Keana L. Graves ,
Brian M. Patterson ,
Yuxin Wang ,
Jan-Henrik Smått  and
Martin G. Bakker
Amy J. Grano
Affiliation:
Department of Chemistry, The University of Alabama, Tuscaloosa, AL 35487-0336, USA.
Franchessa M. Sayler
Affiliation:
Department of Chemistry, The University of Alabama, Tuscaloosa, AL 35487-0336, USA.
Amber Genau
Affiliation:
Department of Materials Science and Engineering, The University of Alabama at Birmingham, Birmingham, AL 35294, USA.
Keana L. Graves
Affiliation:
Department of Chemistry, The University of Alabama, Tuscaloosa, AL 35487-0336, USA.
Brian M. Patterson
Affiliation:
Materials Characterization and Forensics Team, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Yuxin Wang
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
Jan-Henrik Smått
Affiliation:
Laboratory of Physical Chemistry, Åbo Akademi University, Turku, Finland
Martin G. Bakker
Affiliation:
Department of Chemistry, The University of Alabama, Tuscaloosa, AL 35487-0336, USA.
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Abstract

Hierarchically porous materials are of interest in a wide range of applications. If the materials are electronic, or ionic conductors, such materials are of interest as electrodes for use in fuel cells. Using hierarchically porous silica as templates, we have demonstrated the formation of hierarchically porous metal and metal oxide structures. Through the control of the synthesis conditions, we have produced partial replicas ca. 1 cubic centimeter in volume, in which two macroporous networks are separated by a nanoporous membrane. The macroporous network in the silica template is known to be bicontinuous. Our underlying model predicts that the second, induced, macroporous network should be similarly bicontinuous.

Micrometer resolution X-ray tomography of the whole sample confirms that the synthesis produces one bicontinuous macroporous network, and is consistent with the existence of a second set of macropores. Preliminary experiments were carried out using FIB/SEM serial tomography to image the second macropore network, however, the length scale of the structures is such that this approach it is unable to firmly establish that the second macropore network is bicontinuous throughout the entire sample volume.

Keywords

x-ray tomographyporositysol-gel
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1421: Symposium PP – Three-Dimensional Tomography of Materials , 2012 , mrsf11-1421-pp06-18
Copyright
Copyright © Materials Research Society 2012

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References

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