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

Sofi Nöjd, Peter Holmqvist, Niels Boon, Marc Obiols-Rabasa, Priti S. Mohanty, Ralf Schweins, Peter Schurtenberger

Research output: Contribution to journalArticlepeer-review

24 Citations (SciVal)

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.

Original languageEnglish
Pages (from-to)4150-4159
Number of pages10
JournalSoft Matter
Volume14
Issue number20
DOIs
Publication statusPublished - 2018 Jan 1

Subject classification (UKÄ)

  • Physical Chemistry

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