Dynamic Light Scattering Study of Temperature and pH Sensitive Colloidal Microgels

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.

References in corpus (4)

• Observation of empty liquids and equilibrium gels in a colloidal clay
• Reentrant glass transition in a colloid-polymer mixture with depletion attractions
• Gelation as arrested phase separation in short-ranged attractive colloid-polymer mixtures
• Exotic fluids and crystals of soft polymeric colloids

Cited by in corpus (10)

• "In silico" synthesis of microgel particles
• Numerical modelling of non-ionic microgels: an overview
• Dynamical behavior of microgels of Interpenetrated Polymer Networks
• Study of network composition in interpenetrating polymer networks of poly(N isopropylacrylamide) microgels:the role of poly(acrylic acid)
• Swelling of responsive-microgels: experiments versus models
• Internal structure and swelling behaviour of in silico microgel particles
• Molecular mechanisms driving the microgels behaviour: a Raman spectroscopy and Dynamic Light Scattering study
• Link between morphology, structure and interactions of composite microgels
• Numerical insights on ionic microgels: structure and swelling behaviour
• Charge affinity and solvent effects in numerical simulations of ionic microgels