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Issue 20, 2018
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Deswelling behaviour of ionic microgel particles from low to ultra-high densities

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Abstract

The swelling of ionic microgel particles is investigated at a wide range of concentrations using a combination of light, X-ray and neutron scattering techniques. We employ a zero-average contrast approach for small-angle neutron scattering experiments, which enables a direct determination of the form factor at high concentrations. The observed particle size initially decreases strongly with the particle concentration in the dilute regime but approaches a constant value at intermediate concentrations. This is followed by a further deswelling at high concentrations above particle overlap. Theory and experiments point at a pivotal contribution of dangling polymer ends to the strong variation in size of ionic microgels, which presents itself mainly through the hydrodynamics properties of the system.

Graphical abstract: Deswelling behaviour of ionic microgel particles from low to ultra-high densities

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Publication details

The article was received on 26 Feb 2018, accepted on 01 May 2018 and first published on 02 May 2018


Article type: Paper
DOI: 10.1039/C8SM00390D
Citation: Soft Matter, 2018,14, 4150-4159
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    Deswelling behaviour of ionic microgel particles from low to ultra-high densities

    S. Nöjd, P. Holmqvist, N. Boon, M. Obiols-Rabasa, P. S. Mohanty, R. Schweins and P. Schurtenberger, Soft Matter, 2018, 14, 4150
    DOI: 10.1039/C8SM00390D

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