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Kaolinite Particle Sizes in the <2 µm Range Using Laser Scattering

Published online by Cambridge University Press:  28 February 2024

Ian D. R. Mackinnon ,
Philippa J. R. Uwins ,
Anya Yago  and
David Page
Ian D. R. Mackinnon
Affiliation:
Centre for Microscopy and Microanalysis, The University of Queensland, St. Lucia QLD 4072 Australia
Philippa J. R. Uwins
Affiliation:
Centre for Microscopy and Microanalysis, The University of Queensland, St. Lucia QLD 4072 Australia
Anya Yago
Affiliation:
Centre for Microscopy and Microanalysis, The University of Queensland, St. Lucia QLD 4072 Australia
David Page
Affiliation:
Centre for Microscopy and Microanalysis, The University of Queensland, St. Lucia QLD 4072 Australia
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Abstract

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The Clay Minerals Society Source Clay kaolinites, Georgia KGa-1 and KGa-2, have been subjected to particle size determinations by 1) conventional sedimentation methods, 2) electron microscopy and image analysis, and 3) laser scattering using improved algorithms for the interaction of light with small particles. Particle shape, size distribution, and crystallinity vary considerably for each kaolinite. Replicate analyses of separated size fractions showed that in the <2 µm range, the sedimentation/centrifugation method of Tanner and Jackson (1947) is reproducible for different kaolinite types and that the calculated size ranges are in reasonable agreement with the size bins estimated from laser scattering. Particle sizes determined by laser scattering must be calculated using Mie theory when the dominant particle size is less than ∼5 µm. Based on this study of two well-known and structurally different kaolinites, laser scattering, with improved data reduction algorithms that include Mie theory, should be considered an internally consistent and rapid technique for clay particle sizing.

Keywords

KaoliniteLaser scatteringParticle size
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 5 , October 1993 , pp. 613 - 623
Copyright
Copyright © 1993, The Clay Minerals Society

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