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Structural heterogeneity of alkylammonium-exchanged, synthetic fluorotetrasilicic mica

Published online by Cambridge University Press:  09 July 2018

Z. Kłapyta ,
A. GaweŁ ,
T. Fujita  and
N. Iyi
Z. Kłapyta*
Affiliation:
Faculty of Geology, Geophysics and Environmental Protection, University of Mining and Metallurgy, al. Mickiewicza 30, 30-059 Kraków, Poland
A. GaweŁ
Affiliation:
Faculty of Geology, Geophysics and Environmental Protection, University of Mining and Metallurgy, al. Mickiewicza 30, 30-059 Kraków, Poland
T. Fujita
Affiliation:
National Institute for Materials Science, Namiki 1-1, TsukubaIbaraki 305-0044, Japan
N. Iyi
Affiliation:
National Institute for Materials Science, Namiki 1-1, TsukubaIbaraki 305-0044, Japan
*
*E-mail: [email protected]
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Abstract

A series of organo-silicates was obtained from synthetic Na-fluorotetrasilicic mica (Na-TSM) by ion exchange with dodecyl-, tetradecyl-, hexadecyl- and octadecyltrimethylammonium (C12, C14, C16 and C18) bromides. When the concentration of the alkylammonium ions has varied from 0.43 to 3.4 mmol/g of the silicate, the maximum amount adsorbed on the mica was 0.92 mmol/g. As shown by 23Na MAS NMR, ∼0.30 mmol/g of Na+ ions were non-exchangeable, even if a large excess of the organic ions was used. The XRD patterns of all the samples obtained show that alkylammonium ions are distributed inhomogeneously within the mica interlayers. As a consequence, the organo-micas contain several phases consisting of randomly and regularly interstratified layers differing in terms of the amount of alkylammonium ions adsorbed. These different layers swell in ethylene glycol in the same manner and form new interlayers with identical spacings. The d001 values of individual organo-TSMs after glycolation suggest that the alkylammonium ions are oriented perpendicular or almost perpendicular to the mica layers. The Na-TSM layers were not detected in organo-TSMs by XRD. The presence of organic and inorganic (Na) mixed-ion interlayers with spacings controlled by the arrangements of the organic ions is consistent with the results obtained. These data also suggest that the alkylammonium/Na+ ion ratios vary in alternate interlayers.

Keywords

synthetic fluoromicaalkylammonium ionsion exchangeinterstratifications, structural heterogeneity.
Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 2 , June 2003 , pp. 151 - 160
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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