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Investigation of Aggregate Structures on Length Scales from About 5 to 10,000 Å#

Published online by Cambridge University Press:  10 February 2011

Paul W. Schmidt ,
Francoise Ehrburger-Dolle ,
Peter Pfeifer ,
Thomas Rieker ,
Yogendra M. Kapoor  and
Daniel J. Voss
Paul W. Schmidt
Affiliation:
Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211.
Francoise Ehrburger-Dolle
Affiliation:
Institut de Chimie des Surfaces et Interfaces (ICSI) CNRS, 15, rue Jean Starcky, BP n° 2478, F 68057 Mulhouse Cedex, France.
Peter Pfeifer
Affiliation:
Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211.
Thomas Rieker
Affiliation:
Sandia National Laboratories, Advanced Materials Laboratory, 1001 University Ave. SE, Albuquerque, NM 87106.
Yogendra M. Kapoor
Affiliation:
Dept. of Natural Sciences and Mathematics, Lincoln University, Jefferson City, MO 65102.
Daniel J. Voss
Affiliation:
Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211.
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Abstract

Small-angle x-ray scattering has been used to investigate the structure of some carbon blacks, some silicas, and an alumina-silica catalyst carrier on length scales from about 5 to 10,000 Å. Equations developed for structural studies of fractal and non-fractal aggregates of primary particles have been employed to analyze the scattering data. From the intensity data, the average diameters of the primary particles could be calculated or estimated. Despite the very different origins of the samples and the fact that the average diameters of the particles varied from about 30 to over 1000 Å, the scattered intensities from the samples had many common features. The data showed that the primary particles had a uniform density and were bounded by smooth or fractal surfaces. On length scales greater than the diameters of the primary particles but not more than a few times larger than the average diameters of the aggregates, some of the aggregates were mass fractals, and others were surface fractals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 407: Symposium M – Disordered Materials and Interfaces-Fractals, structure and Dynamics , 1995 , 399
Copyright
Copyright © Materials Research Society 1996

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Footnotes

#

Acknowledgment is made to the Donors of the Petroleum Research Fund, administered by the American Chemical Society, for support of this work.

References

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