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Effect of Pellet Pressing on the Infrared Spectrum of Kaolinite

Published online by Cambridge University Press:  02 April 2024

Valerie A. Bell ,
Vincent R. Citro  and
Gail D. Hodge
Valerie A. Bell
Affiliation:
Engelhard Corporation, Edison, New Jersey 08818-2900
Vincent R. Citro
Affiliation:
Engelhard Corporation, Edison, New Jersey 08818-2900
Gail D. Hodge
Affiliation:
Engelhard Corporation, Edison, New Jersey 08818-2900
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Abstract

Diffuse reflectance infrared (IR) spectra show that pressing kaolinite into pellets for transmission IR studies changes relative intensities of hydroxyl peaks between 3700–3600 cm-1. The magnitude of change depends on the absolute pressure, the pressing time and whether a salt matrix is used. Pressing with KBr causes larger differences than pressing neat. Diffuse reflectance IR does not require sample pressing, eliminating this variable in kaolinite studies. This improves IR's ability to distinguish kaolinites according to their hydroxyl group differences and may lead to a better understanding of kaolinite hydroxyl structures.

Keywords

KaoliniteDiffuse reflectance infraredKaolinite hydroxylsKaolinite pressing
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 3 , June 1991 , pp. 290 - 292
Copyright
Copyright © 1991, The Clay Minerals Society

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