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摘要
A multiphysics formulation termed the multi-effect-coupling ionic-strength-stimulus (MECis) model is presented for analysis of volume transition of the ionic-strength-sensitive hydrogel with focusing on the effect of the initial distance between the charges fixed on the polymeric network. The present MECis model considers chemical, electrical, and mechanical coupled domains. It is composed of the Nernst-Planck convection-diffusion equations for describing the chemical field, Poisson equation for the electrical potential associated with the fixed charge formulation that is based on the Langumiur adsorption theory, and the mechanical equilibrium equation for the finite deformation of the ionic-strength-sensitive hydrogel. In the MECis model, the ionic strength of the bathing solution is considered as a key environmental stimulus and incorporated into the Nernst-Planck equations and the fixed charge formulation, respectively, via the activity coefficient and apparent dissociation constant. By comparing the present simulation results with the experiments, the accuracy and robustness of the MECis model are examined. As an important physical parameter for the chemical-expansion stress of the hydrogel, the initial distance between the fixed charges is studied in detail. The corresponding parameter study is conducted for analysis of the influence of the initial distance between the fixed charges on the responsive characteristics of the ionic-strength-sensitive hydrogel, including the ionic transport, electrical potential, and hydrogel deformation or displacement.
- 出版日期2013-1-1
- 单位南阳理工学院
