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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Matter Physics

Background:

  • Microgels are versatile solute carriers whose properties depend on solute interactions.
  • Polyoxometalates (POMs) are ionic solutes with unique properties relevant for material modification.

Purpose of the Study:

  • To investigate the impact of superchaotropic Keggin POMs (PW and SiW) on the swelling and internal structure of nonionic poly(N-isopropylacrylamide) (pNiPAM) microgels.
  • To understand the mechanisms behind POM-induced swelling and deswelling in microgels.
  • To explore the potential of POMs for fine-tuning microgel properties.

Main Methods:

  • Light scattering techniques.
  • Small-angle X-ray scattering (SAXS).

Main Results:

  • POM binding induces microgel swelling at low concentrations due to counterion osmotic pressure and deswelling at higher concentrations via physical cross-linking.
  • The swelling/deswelling transition is sharper for PW than SiW, attributed to PW's lower charge density and stronger binding.
  • Microgel network softness and topology significantly influence the swelling response to POM binding.
  • POM/pNiPAM systems exhibit both temperature and pH-responsive swelling.

Conclusions:

  • POMs offer a novel method for controlling microgel swelling and internal structure, distinct from traditional salts or surfactants.
  • Microgel network architecture plays a crucial role in mediating responses to external stimuli like POMs.
  • These findings open avenues for designing advanced functional microgels with tunable properties for various applications.