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Ionic Conductivity in Polyelectrolyte Hydrogels

Journal Article · · Macromolecules
 [1];  [1];  [2];  [1]
  1. Northwestern Univ., Evanston, IL (United States)
  2. Northwestern Univ., Evanston, IL (United States); Univ. of Massachusetts, Lowell, MA (United States)
Transport of ionic species in heterogeneous polymeric media is highly dependent on the charge distributions and interactions between mobile and immobile groups. Here we perform coarse-grained molecular dynamics simulations to study the ion dynamics in swollen polyelectrolyte gels under external electric fields. A nonlinear response of the ionic conductivity to an applied electric field, for field strengths that are comparable to the ionic coupling strength, is observed. This behavior correlates to a broadening of the ionic distribution around the polymer backbone under an increasing electric field. Also, we find that the weak-field ionic mobility in gels increases with density, which is opposite to the behavior of simple electrolytes. This relates to the mean coupling between charges that decreases in gels, but increases in simple electrolytes, with increasing density. These results provide more insights into the electric response of polyelectrolyte gels to support the development of applications that combine electric and mechanical properties of polyelectrolyte gels for energy storage, sensing, selective transport, and signal transfer.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Bio-Inspired Energy Science (CBES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0000989
OSTI ID:
1388648
Journal Information:
Macromolecules, Journal Name: Macromolecules Journal Issue: 23 Vol. 49; ISSN 0024-9297
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Modeling of stimuli-responsive nanoreactors: rational rate control towards the design of colloidal enzymes journal January 2020
Poisson–Boltzmann modeling and molecular dynamics simulations of polyelectrolyte gel diodes in the static regime journal January 2020
Chromophore amphiphile–polyelectrolyte hybrid hydrogels for photocatalytic hydrogen production journal January 2020
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