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Determination of Shape of Kaolin Pigment Particles

Published online by Cambridge University Press:  09 July 2018

R. A. Slepetys  and
A. J. Cleland
R. A. Slepetys
Affiliation:
Engelhard Corporation, 101 Wood Ave., Iselin, NJ 08830, USA
A. J. Cleland
Affiliation:
Engelhard Corporation, 101 Wood Ave., Iselin, NJ 08830, USA
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Abstract

Characterization of platiness of kaolin pigments was derived from the divergence of measurements of their particle size distribution by two different techniques: sedimentation and light scattering. A numerical shape factor, which is related to the ratio of kaolin particle face diameter to its thickness, can be calculated to provide a quantitative measure of such platiness. Two sets of kaolin pigments were prepared from a Middle Georgia kaolin: delaminated and non-delaminated. Shape factors of delaminated samples were higher than those of non-delaminated ones. Maximum platiness was found between equivalent volume diameters of 1·0 and 2·0 μm. Examples are presented where properties of coated paper are correlated with the size and shape of kaolin pigments.

Type
Research Article
Information
Clay Minerals , Volume 28 , Issue 4 , December 1993 , pp. 495 - 508
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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