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Local structure of temperature and pH-sensitive colloidal microgels.

Valentina Nigro1, Roberta Angelini2, Monica Bertoldo3

  • 1Dipartimento di Scienze, Sezione di Nanoscienze, Università degli Studi Roma Tre, Via della Vasca Navale 84, I-00146 Roma, Italy.

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Summary

Colloidal microgel particles exhibit distinct structural changes during their volume phase transition. pH control influences the transition

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Matter Physics

Background:

  • Colloidal microgel particles are composed of interpenetrated polymer networks.
  • These particles undergo a volume phase transition from a swollen to a shrunken state with changing temperature.
  • Understanding their intra-particle structure is crucial for material applications.

Purpose of the Study:

  • To investigate the temperature dependence of the local intra-particle structure of microgel particles.
  • To explore the influence of pH and concentration on the volume phase transition.
  • To elucidate the structural mechanisms governing the transition.

Main Methods:

  • Small-angle neutron scattering (SANS) was employed to probe the local structure.
  • Experiments were conducted across a temperature range of (299–315) K.
  • A theoretical model incorporating interpenetrated polymer networks and cross-linkers was used for data analysis.

Main Results:

  • The temperature dependence of microgel particle structure was successfully modeled.
  • Two distinct transition behaviors were observed: a sharp transition at neutral pH and a continuous transition at acidic pH.
  • At neutral pH, a shift from a water-rich, inhomogeneous structure to a homogeneous, solid-like structure occurred.

Conclusions:

  • The study reveals that pH significantly tunes the sharpness of the volume phase transition in microgel particles.
  • A sharp transition involves significant water expulsion and structural homogenization.
  • Continuous transitions at acidic pH suggest a more gradual structural rearrangement.