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Change of the Refractive Index of Illite Particles by Reduction of the Fe Content of the Octahedral Sheet

Published online by Cambridge University Press:  01 January 2024

Frank Friedrich ,
Annett Steudel  and
Peter G. Weidler
Frank Friedrich*
Affiliation:
Division of Nanomineralogy, Institute for Technical Chemistry - Water and Geotechnology (ITC-WGT), Forschungszentrum Karlsruhe GmbH, Germany
Annett Steudel
Affiliation:
Division of Nanomineralogy, Institute for Technical Chemistry - Water and Geotechnology (ITC-WGT), Forschungszentrum Karlsruhe GmbH, Germany
Peter G. Weidler
Affiliation:
Division of Nanomineralogy, Institute for Technical Chemistry - Water and Geotechnology (ITC-WGT), Forschungszentrum Karlsruhe GmbH, Germany
*
* E-mail address of corresponding author: frank.friedrich@itc-wgt.fzk.de
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Abstract

Sub-micrometer clay particles are of interest in clay-polymer applications, especially when transparency is important. The scattering of light can be reduced by the adjustment of the refractive index (RI) of the clays to that of the matrix. In this study, the RI of sub-micrometer illite particles was changed by treatment with 5 M HCl for treatment times ranging between 2 and 24 h. The dissolution of Fe leads to a decrease in the RI of illite from 1.587 for the unaltered material to 1.502 after 24 h. The layer structure of the illite particles was preserved during the treatment. The RI of the sub-micrometer illite particles was determined by means of a photospectrometer measuring the light intensity passing through suspensions containing the clay particles, with varying refractive indices.

Keywords

ClayLayer SilicatesNanocompositesOptical PropertiesRefractive IndexSmall Particles
Type
Article
Information
Clays and Clay Minerals , Volume 56 , Issue 5 , October 2008 , pp. 505 - 510
Copyright
Copyright © The Clay Minerals Society 2009

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