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Polyphosphates can stabilize but also aggregate colloids

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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Publication details

The article was received on 23 Sep 2019, accepted on 29 Nov 2019 and first published on 29 Nov 2019


Article type: Communication
DOI: 10.1039/C9CP05225A
Phys. Chem. Chem. Phys., 2019, Accepted Manuscript

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    Polyphosphates can stabilize but also aggregate colloids

    R. J. B. Jossanea Brasileiro Motta, A. Z. F. Almeida, B. L. B. de Lima, R. Schneider, R. C. Balaban, J. S. van Duijneveldt and R. J. de Oliveira, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP05225A

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