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Surfactant-modulation of the cationic-polymer-induced aggregation of anionic particulate dispersions

Surfactant-modulation of the cationic-polymer-induced aggregation of anionic particulate dispersions

Abdullahi, Wasiu, Crossman, Martin and Griffiths, Peter Charles ORCID: 0000-0002-6686-1271 (2020) Surfactant-modulation of the cationic-polymer-induced aggregation of anionic particulate dispersions. Polymers, 12 (2):287. ISSN 2073-4360 (Online) (doi:https://doi.org/10.3390/polym12020287)

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Abstract

Commodity formulations contain many chemically distinct components and their mutual interactions defines the beneficial characteristics of the formulation. Mixing oppositely charged polymers and surfactants invariably induces macroscopic phase separation, to a degree dependent on the prevailing polymer and surface charge densities, and the interaction can be modulated by added ionic surfactants. Here, it is shown that a general universality exists between the charge present on a series of cationic modified cellulose polymers – the charge being controlled either by the degree of cationic modification of the polymer itself or through the subsequent level of anionic surfactant binding – and its capacity to remove anionic colloidal material from solution, be that silica particles or polystyrene-butadiene lattices. Particulate material not removed from solution bears no adsorbed polymer, i.e. the particle surface is bare. Addition of non-ionic surfactant does not negate this universality, implying that the non-ionic surfactant is largely a spectator molecule or structure (micelle) in these systems, and that the dominant force is an electrostatic one.

Item Type: Article
Uncontrolled Keywords: flocculation, polyelectrolyte, bridging flocculation, solvent relaxation, charge-charge interactions, polyelectrolyte-surfactant interactions
Subjects: Q Science > Q Science (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Materials & Analysis Research Group
Faculty of Engineering & Science > School of Science (SCI)
Last Modified: 04 Feb 2020 13:03
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/26870

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