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The structure of an intercalated ordered kaolinite — a Raman microscopy study

Published online by Cambridge University Press:  09 July 2018

R. L. Frost ,
T. H. Tran  and
J. Kristof
R. L. Frost
Affiliation:
Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, Q4001, Australia
T. H. Tran
Affiliation:
Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, Q4001, Australia
J. Kristof
Affiliation:
Department of Analytical Chemistry, University of Veszprem, H8201 Veszprem, PO Box 158, Hungary
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Abstract

Changes in the molecular structure of a highly ordered kaolinite, intercalated with urea and potassium acetate, have been studied using Raman microscopy. A new Raman band, attributed to the inner surface hydroxyl groups strongly hydrogen bound to the acetate, is observed at 3605 cm-1 for the potassium acetate intercalate with the consequential loss of intensity in the bands at 3652, 3670, 3684 and 3693 cm-1. Remarkable changes in intensity of the Raman spectral bands of the low-frequency region of the kaolinite occurred upon intercalation. In particular, the 144 and 935 cm-1 bands increased by an order of magnitude and were found to be polarized. These spectroscopic changes provide evidence for the inner surface hydroxyl group-acetate bond being at an angle approaching 90° to the 001 face. Decreases in intensity of the bands at 243, 271 and 336 cm-1 were observed. The urea intercalate shows additional Raman bands at 3387, 3408 and 3500 cm-1 which are attributed to N-H vibrations after formation of the urea-kaolinite complex. Changes in the spectra of the inserting molecules were also observed.

Type
Research Article
Information
Clay Minerals , Volume 32 , Issue 4 , December 1997 , pp. 587 - 596
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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