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Liquid-solid phase transition of physical hydrogel subject to an externally applied electro-chemo-mechanical coupled field with mobile ionic species

Abstract

In this paper, a model is developed multiphysically for simulation of the phase transition of physical hydrogels between liquid solution and solid gel states subject to an electro-chemo-mechanical coupled field, with effect of the mobile ionic species in the solution. The present model consists of the governing equations for the equilibrium of forces and the conservation of mass, the Maxwell’s equations, and an evolution equation for the interface. Based on the second law of thermodynamics, the constitutive equations are formulated from the energy viewpoint, including a novel formulation of free energy with the effect of crosslink density. The present model may reduce to Suo’s non-equilibrium thermodynamic theory, if the interface is ignored when only a single phase exists. Moreover, the present model may also reduce to Dolbow’s model for gel-gel phase transition when the electric field is ignored. Therefore, the present model becomes more generalized since it is able to model both the bulk phase and the interface behaviors and the mechanical field is coupled with both the electric and chemical fields simultaneously. As the first case study, the system at equilibrium state is investigated numerically for analysis of the influences of the electrical and chemical potentials as well as mechanical pressure externally imposed on the boundary of the system domain. The second case study presents a spherically symmetrical solution-gel phase transition at non-equilibrium states, with the emphasis on the evolutions of both the interface and electrochemical potentials.

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Publication details

The article was received on 18 Apr 2017, accepted on 07 Jul 2017 and first published on 10 Jul 2017


Article type: Paper
DOI: 10.1039/C7CP02501G
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Liquid-solid phase transition of physical hydrogel subject to an externally applied electro-chemo-mechanical coupled field with mobile ionic species

    T. Wu and H. Li, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP02501G

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