Electrostatic control of nanoscale phase behavior of polyelectrolyte networks

Prateek K. Jha, Jos W. Zwanikken, Juan J. De Pablo, Monica Olvera De La Cruz*

*Corresponding author for this work

Research output: Contribution to journalReview article

22 Scopus citations

Abstract

Polyelectrolyte gels are intelligent materials that undergo large reversible volume changes for a range of environmental stimuli. Although the strength of electrostatic interactions have a strong influence on the gel response, these interactions are not properly accounted in the classical mean-field theories that assume a homogeneous charge-neutral gel. Using Poisson-Boltzmann theory and theoretically informed coarse-grained simulations, we emphasize the importance of charge inhomogeneities and the associated Coulomb interactions in determining the response of gels. Our analysis reveals that nanometer-sized gels, collapsed gels, and gels in media with low salinity or high dielectric constant, have large regions of excess charge. We also observe that the addition of salt can induce collapse in swollen gels by compensating the polymer charge.

Original languageEnglish (US)
Pages (from-to)271-276
Number of pages6
JournalCurrent Opinion in Solid State and Materials Science
Volume15
Issue number6
DOIs
StatePublished - Dec 2011

Keywords

  • Ionic gel
  • Nanogel
  • Poisson-Boltzmann theory
  • Polyelectrolyte network
  • Theoretically informed coarse-grained simulations

ASJC Scopus subject areas

  • Materials Science(all)

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