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Anomalous Viscosity, Aggregation, and Non-Ergodic Phase of Laponite® RD in a Water–Methanol Binary Solvent

Published online by Cambridge University Press:  01 January 2024

Preeti Tiwari ,
Himadri B. Bohidar ,
Avik Das ,
Jitendra Bahadur  and
Najmul Arfin Open the ORCID record for Najmul Arfin [Opens in a new window]
Preeti Tiwari
Affiliation:
Soft Condensed Matter Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India 110025
Himadri B. Bohidar
Affiliation:
School of Physical Sciences, Jawaharlal Nehru University, New Delhi, India 110067
Avik Das
Affiliation:
Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India 400085
Jitendra Bahadur
Affiliation:
Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India 400085 Homi Bhabha National Institute, Anushaktinagar, Mumbai, India 400094
Najmul Arfin*
Affiliation:
Soft Condensed Matter Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India 110025
*
e-mail: narfin@jmi.ac.in
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Abstract

Study of the behavior of landfill lining materials (clays) in organic solvents is important because, in waste management, lining prevents groundwater contamination by the adsorption of various pollutants such as chemicals and organic solvents. Although scaling behavior and the self-association property of clays in water-alcohol binary solvents have been studied by many researchers, the anomalous behavior of Laponite XLG in binary solvents requires investigation as suggested by previous studies. In the present study, Laponite® RD, which is structurally similar to Laponite XLG, was used to gain further insight into the reasons for the anomalous viscosity, aggregation, and non-ergodic behavior of clay in a water–methanol binary solvent. Dynamic light scattering (DLS) revealed the emergence of the non-ergodic phase of 3% w/v Laponite® RD in the water–methanol binary solvent, which increased in the presence of a large methanol content as well as with aging time in the binary solvent. Viscosity measurements further indicated that aggregation was responsible for the non-ergodic behavior, and small-angle X-ray scattering (SAXS) revealed that a large methanol content enhanced the aggregation. Moreover, SAXS data also revealed that the surface charge was responsible for anomalous viscosity fluctuations in the binary solvent due to interparticle repulsion within aggregates. Rheological studies showed that the large methanol content in the binary solvent led to frequency-independent behavior of the storage modulus of Laponite® RD.

Keywords

AggregationAnomalous viscosityLaponiteNon-ergodicityScattering
Type
Original Paper
Information
Clays and Clay Minerals , Volume 71 , Issue 1 , February 2023 , pp. 1 - 13
Copyright
Copyright © The Author(s), under exclusive licence to The Clay Minerals Society 2023

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Footnotes

Associate Editor: Geoffrey Bowers.

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