Inhomogeneous swelling of pH-responsive gels

Inhomogeneous swelling of pH-responsive gels A model is developed for the mechanical response of pH-sensitive gels under an arbitrary three-dimensional deformation accompanied by swelling. A polyelectrolyte gel is treated as a three-phase medium consisting of a polymer network, solvent (water), and solute (mobile ions). Transport of solvent and solute is thought of as their diffusion through the network accelerated by an electric field formed by mobile ions and bound charges and accompanied by chemical reactions. Constitutive equations are derived by means of the free energy imbalance inequality with reference to the principle of electro-mechanical equivalence. An analog of the Donnan equilibrium conditions is developed where self-ionization of water molecules is taken into account. Material constants are found by matching swelling diagrams under unconstrained water uptake by covalently cross-linked poly(acrylic acid) and poly(aspartic acid) gels. The effect of pH on distribution of water molecules and ions in core-shell microgel particles is studied numerically. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Solids and Structures Elsevier

Loading next page...
 
/lp/elsevier/inhomogeneous-swelling-of-ph-responsive-gels-U0KGSDJ67M
Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier Ltd
ISSN
0020-7683
eISSN
1879-2146
D.O.I.
10.1016/j.ijsolstr.2016.02.037
Publisher site
See Article on Publisher Site

Abstract

A model is developed for the mechanical response of pH-sensitive gels under an arbitrary three-dimensional deformation accompanied by swelling. A polyelectrolyte gel is treated as a three-phase medium consisting of a polymer network, solvent (water), and solute (mobile ions). Transport of solvent and solute is thought of as their diffusion through the network accelerated by an electric field formed by mobile ions and bound charges and accompanied by chemical reactions. Constitutive equations are derived by means of the free energy imbalance inequality with reference to the principle of electro-mechanical equivalence. An analog of the Donnan equilibrium conditions is developed where self-ionization of water molecules is taken into account. Material constants are found by matching swelling diagrams under unconstrained water uptake by covalently cross-linked poly(acrylic acid) and poly(aspartic acid) gels. The effect of pH on distribution of water molecules and ions in core-shell microgel particles is studied numerically.

Journal

International Journal of Solids and StructuresElsevier

Published: Jun 1, 2016

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off