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Surface chemistry, rheology and microstructure of as-received SHCa-1 hectorite gels

Published online by Cambridge University Press:  01 August 2019

Pek-Ing Au ,
Mingyong Du ,
Jishan Liu ,
Md. Bashirul Haq  and
Yee-Kwong Leong Open the ORCID record for Yee-Kwong Leong [Opens in a new window]
Pek-Ing Au
Affiliation:
Department of Chemical Engineering, The University of Western Australia, Crawley 6009, Australia Department of Chemical Engineering, Curtin University Miri, Sarawak, Malaysia 98009
Mingyong Du
Affiliation:
Department of Chemical Engineering, The University of Western Australia, Crawley 6009, Australia
Jishan Liu
Affiliation:
Department of Chemical Engineering, The University of Western Australia, Crawley 6009, Australia
Md. Bashirul Haq
Affiliation:
Department of Petroleum Engineering, College of Petroleum and Geosciences, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
Yee-Kwong Leong*
Affiliation:
Department of Chemical Engineering, The University of Western Australia, Crawley 6009, Australia
*
*E-mail: yeekwong.leong@uwa.edu.au
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Abstract

The zeta potential and yield-stress behaviour of gels prepared from as-received SHCa-1 hectorite (Ht) containing 50 wt.% impurities, mainly of calcite, dolomite and quartz, were characterized. The zeta potential is negative in the pH range 4–12. At pH <5, reaction of CaCO3 producing CO2 and Ca2+ increased the solution conductivity significantly and reduced the zeta potential. The buffering effect due to this chemical reaction was also observed in the yield stress–pH characterization below pH 8. Low yield stress was observed below pH 6 and above pH 12. The yield stress peaked at pH ~8, where Ht displayed a zeta potential of –20 mV. The relationship between maximum yield stress and Ht content (wt.%) was linear and was not affected by impurities. The ageing behaviour was characterized by an initial phase of rapid yield-stress increase and then by a phase of gradual increase. The Leong model performed better than the two-parameter glassy polymer ageing model in describing this ageing behaviour. However, the empirical power law model was more accurate. The timescale of the ageing process is long, lasting several days. An open cellular microstructure was observed to form in the gels. Impurities appeared not to interact with or bind to the Ht platelets.

Keywords

ageing modellingdolomiteopen cellular microstructurethixotropyyield stresszeta potential
Type
Article
Information
Clay Minerals , Volume 54 , Issue 3 , September 2019 , pp. 269 - 275
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Footnotes

Associate Editor: Laurent Michot

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