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Influence of particle size on the paramagnetic components of kaolins from different origins

Published online by Cambridge University Press:  09 July 2018

N. Worasith  and
B. A. Goodman
N. Worasith
Affiliation:
Department of Science, Faculty of Science and Technology, Rajamangala University of TechnologyKrungthep, 2 Nang Lin Chi Road, Soi Suan Plu, Sathorn, Bangkok, Thailand
B. A. Goodman*
Affiliation:
State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, 520004 Guangxi, China
*
*E-mail: bernard_a_goodman@yahoo.com
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Abstract

Electron paramagnetic resonance (EPR) spectra of different particle size fractions of four kaolins from diverse sources in North America, Europe and Asia have been investigated in order to characterize their paramagnetic properties and heterogeneity. There were major differences in the sources of the EPR signals from transition metals; V and Mn were structural, Fe was both structural and as associated oxides, and Cu was in the form of an adsorbed ion. The radiation-induced free radical signals commonly known as the A- and B-centres were observed in three of the deposits; however, in addition to the previously reported 27Al hyperfine structure associated with the B-centre, we also observed much smaller 27Al hyperfine structure on the g┴ feature of the A-centre. The other kaolin sample produced four free radical signals that have not previously been reported in kaolins. Each had substantial 1H hyperfine splitting; three are interpreted as corresponding to defect centres associated with Si-OH groups, and the other to a Si hole surrounded by protonated O atoms. The EPR spectra changed progressively with particle size, and measurements on the Asian specimens after grinding showed major differences in the Fe3+ signals from the same particle size fractions separated from the natural samples, thus supporting previous reports that grinding results in major structural changes in the minerals.

Keywords

kaolinitehalloysiteEPRfree radicalironvanadiummanganesecopper
Type
Research Article
Information
Clay Minerals , Volume 47 , Issue 4 , December 2012 , pp. 539 - 557
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

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