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

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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.


Enheter & grupper
Externa organisationer
  • Institut Laue Langevin
  • Kalinga Institute of Industrial Technology (KIIT)

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Fysikalisk kemi
Sidor (från-till)4150-4159
Antal sidor10
TidskriftSoft Matter
StatusPublished - 2018 jan 1
Peer review utfördJa