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Influence of Ionic Environment and pH on the Electrokinetic Properties of Ball Clays

Published online by Cambridge University Press:  28 February 2024

Carmen Galassi ,
Anna Luisa Costa  and
Paolo Pozzi
Carmen Galassi
Affiliation:
IRTEC-CNR, Via Granarolo 64, 1-48018, Faenza (RA), Italy
Anna Luisa Costa
Affiliation:
IRTEC-CNR, Via Granarolo 64, 1-48018, Faenza (RA), Italy
Paolo Pozzi
Affiliation:
Dip. di Chimica, Università di Modena e Reggio Emilia, Via Campi 183, I-41100 Modena, Italy
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Abstract

Three ball clays (SP from England, TSMA from France and UK from the Ukraine) were characterized for their dry and wet colloidal properties. On the basis of X-ray diffraction and chemical analyses the clays were classified as kaolinite-rich clay, smectitic kaolinite-rich clay and illitic kaolinite-rich clay. The ζ (zeta) potential at the clay-water interface as a function of pH, in three different electrolytes, was investigated using an electroacoustic technique. Starting from measurements of dynamic mobility, the calculated ζ potential was found to be almost constant as a function of pH for the TSMA and UK clays, while it increased from −20 to −60 for the SP clay, when potassium nitrate was used as an electrolyte. The behavior of the three clays in calcium and magnesium nitrate was slightly different: SP showed a smaller increase in ζ potential, while a small deviation from the constant behavior of the UK clay was found. The results are explained in terms of the surrounding-ion atmosphere in light of the chemical-physical properties measured. Our results may well be of use to those involved in ceramic processing.

Keywords

Cation Exchange CapacityClay MineralsElectroacousticElectrolytesStructural PropertiesSurface Chargeζ Potential
Type
Research Article
Information
Clays and Clay Minerals , Volume 49 , Issue 3 , June 2001 , pp. 263 - 269
Copyright
Copyright © 2001, The Clay Minerals Society

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