Swelling of composite microgels with soft cores and thermo-responsive shells

Aleksey D. Drozdov, Jesper deClaville Christiansen

Research output: Contribution to journalArticlepeer-review

Abstract

This study deals with constitutive modeling and numerical simulation of equilibrium swelling of composite microgels with soft temperature-insensitive cores and thermo-responsive (TR) shells. Our analysis takes into account a pronounced increase in the elastic moduli of TR gels of the LCST (lower critical solution temperature) type driven by aggregation of hydrophobic segments into clusters above the volume phase transition temperature. Material parameters are found by fitting observations on poly(acrylamide) and poly(N-isopropylacrylamide) gels with various concentrations of cross-linkers. Good agreement is demonstrated between the experimental data and results of numerical analysis. The effects of mechanical properties of the core and the shell and geometry of composite microgels on distribution of water molecules are studied numerically. Several unexpected phenomena are discovered in simulation.

Original languageEnglish
JournalMechanics of Advanced Materials and Structures
DOIs
StateAccepted/In press - 1 Jan 2021
Externally publishedYes

Keywords

  • Thermo-responsive gel
  • core-shell microgel
  • equilibrium swelling
  • modeling
  • volume phase transition

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mathematics (all)
  • Materials Science (all)
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint

Dive into the research topics of 'Swelling of composite microgels with soft cores and thermo-responsive shells'. Together they form a unique fingerprint.

Cite this