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

Research output: Contribution to journalArticle

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.

Details

Authors
Organisations
External organisations
  • Institut Laue Langevin
  • Kalinga Institute of Industrial Technology (KIIT)
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Chemistry
Original languageEnglish
Pages (from-to)4150-4159
Number of pages10
JournalSoft Matter
Volume14
Issue number20
Publication statusPublished - 2018 Jan 1
Publication categoryResearch
Peer-reviewedYes