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Neutron Scattering Study of Layered Silicates Pillared with Alkylandnonium Ions

Published online by Cambridge University Press:  21 February 2011

D. A. Neumann ,
J. M. Nicol ,
J. J. Rush ,
N. Wada ,
Y. B. Fan ,
H. Kim ,
S. A. Solin ,
T. J. Pinnavaia  and
S. F. Trevino
D. A. Neumann
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899
J. M. Nicol
Affiliation:
University of Maryland, College Park, MD 20742 & NIST, Gaithersburg, MD
J. J. Rush
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899
N. Wada
Affiliation:
Department of Physics, Colorado School of Mines, Golden, CO 80401
Y. B. Fan
Affiliation:
Michigan State University, East Lansing, MI 48824
H. Kim
Affiliation:
Michigan State University, East Lansing, MI 48824
S. A. Solin
Affiliation:
Michigan State University, East Lansing, MI 48824
T. J. Pinnavaia
Affiliation:
Michigan State University, East Lansing, MI 48824
S. F. Trevino
Affiliation:
ARDEC, Picatinny Arsenal, NJ & NIST, Gaithersburg, MD 20899
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Abstract

Incoherent, inelastic neutron scattering has been used to study the vibrational spectra of tetramethylammonium montmorillonite and trimethylammonium vermiculite in the energy range 20–140 meV. For both systems peaks are observed due to the internal modes of the intercalate and to the excitations of the hydroxyl groups within the host layers. For the montmorillonite sample, it is found that the steric constraints imposed on the tetramethylammonium ion by the bounding clay layers contribute an additional 28 meV to the rotational barrier of the methyl groups. This additional barrier is shown to be strongly related to the volume that the tetramethylammonium ion occupies. For the trimethylammonium vermiculite sample normal mode analysis of the internal modes of the intercalated ion shows that the N-H bond is parallel to the c-axis of the host.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 166: Symposium J – Neutron Scattering for Materials Science , 1989 , 397
Copyright
Copyright © Materials Research Society 1990

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References

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