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Polyphosphates can stabilize but also aggregate colloids

Research output: Contribution to journalArticle

Original languageEnglish
Article number15
Pages (from-to)15-19
Number of pages5
JournalPhysical Chemistry Chemical Physics
Volume2020
Issue number1
DOIs
DateAccepted/In press - 29 Nov 2019
DatePublished (current) - 29 Nov 2019

Abstract

Phosphates are well known as dispersants for a variety of colloidal particles. Here however we use rheological measurements to show that high molecular weight polyphosphates (PP) can instead act as a flocculant for Laponite clay platelets. The proposed mechanism is bridging of PP between clay particle edges, leading to highly charged clusters forming a Wigner glass. Dynamic light scattering shows a bimodal cluster size distribution, independent of PP molecular weight, but the highest molecular weight gave the highest viscous and loss moduli for the PP-clay solid. These unique all-inorganic solids may have application in solid-state ionic conducting materials, controlled release fertilizers and biomedical applications.

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Royal Society of Chemistry at https://pubs.rsc.org/en/content/articlelanding/2019/cp/c9cp05225a#!divAbstract. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 2.46 MB, PDF document

    Embargo ends: 29/11/20

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DOI

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