Dynamic Light Scattering Study of Temperature and pH Sensitive Colloidal Microgels

Valentina Nigro; Roberta Angelini; Monica Bertoldo; Valter Castelvetro; Giancarlo Ruocco; Barbara Ruzicka

doi:10.1016/j.jnoncrysol.2014.08.039

Dynamic Light Scattering Study of Temperature and pH Sensitive Colloidal Microgels

Soft Condensed Matter 2022-06-14 v1

Authors: Valentina Nigro , Roberta Angelini , Monica Bertoldo , Valter Castelvetro , Giancarlo Ruocco , Barbara Ruzicka

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Abstract

Microgel particles composed of Interpenetrated Polymer Networks (IPN) of poly(N-isopropylacrylamide) (PNIPAM) and poly(acrylic acid) (PAAc) dispersed in water have been investigated through dynamic light scattering. The study of the temperature, concentration and pH dependence of the relaxation time has highlighted the existence of a thermoreversible transition corresponding to the swollen-shrunken volume phase transition. The presence of PAAc introduces an additional pH-sensitivity with respect to the temperature-sensitivity due to PNIPAM and leads to interesting differences in the transition process at acid and neutral pH.

Keywords

water dynamics crystal growth and phase transitions polymer physics

Cite

@article{arxiv.2206.05501,
  title  = {Dynamic Light Scattering Study of Temperature and pH Sensitive Colloidal Microgels},
  author = {Valentina Nigro and Roberta Angelini and Monica Bertoldo and Valter Castelvetro and Giancarlo Ruocco and Barbara Ruzicka},
  journal= {arXiv preprint arXiv:2206.05501},
  year   = {2022}
}

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