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A method of extending magnetic birefringence particle sizing into the sub-micron range

Published online by Cambridge University Press:  09 July 2018

S. R. Wilson ,
P. J. Ridler  and
B. R. Jennings
S. R. Wilson
Affiliation:
School of Electrical Electronic and Information Engineering, South Bank University, London SE1 0AA, UK
P. J. Ridler
Affiliation:
School of Electrical Electronic and Information Engineering, South Bank University, London SE1 0AA, UK
B. R. Jennings
Affiliation:
JJ Thompson Physical Laboratory, Department of Physics, The University of Reading, Reading RG6 6AF UK
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Extract

Both magnetic and electric fields have been used to induce optical birefringence in colloidal suspen- sions. These have formed the bases of fast methods for measuring particle sizes and their distributions (Mekshenkov, 1965; Tsvetkov et al., 1975; O'Konski, 1976; Maret & Dransfeld, 1977; Stoylov, 1991; Jennings & Stoylov, 1992; Trusov & Vojtylov, 1993). Whereas the majority of studies have related to the electric-field procedure, we recently reported a magneto-optic procedure suitable for sizing magnetic particles (Wilson et al., 1996). By increasing the viscosity of the suspensions, we are now able to extend the size range down into the sub-micron region with relative ease. This note reports magnetic birefringence data for a montmorillonite sample and justifies the technique via supplementary data on vermiculite of greater size range.

Type
Notes
Information
Clay Minerals , Volume 34 , Issue 3 , September 1999 , pp. 511 - 514
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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