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首页> 外文期刊>Smart Materials & Structures >Coupled chemo-electro-mechanical finite element simulation of hydrogels: II. Electrical stimulation
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Coupled chemo-electro-mechanical finite element simulation of hydrogels: II. Electrical stimulation

机译：水凝胶的化学-电-机械耦合有限元模拟：II。电刺激

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摘要

Certain polyelectrolyte gels are distinguished by a large swelling or bending capability under the influence of external physical, chemical or electrical stimuli. In this paper we investigate the mechanisms occurring in polyelectrolyte gels due to externally applied electric fields. By applying a coupled chemo-electro-mechanical model which is extended and predestined for electrical stimulation, we describe the concentrations and the electric potential in both the gel and the solution as well as the locally different swelling and shrinking in the gel. The local change of geometry is formulated by a local osmotic pressure difference between the gel and the solution next to the gel phase. In addition to this effect, the change of the local gel domain leads to a local variation of the concentration of bound groups and thus to a change of the local concentrations of mobile ions. As the focus of the presented work we demonstrate the superiority of the fully coupled chemo-electro-mechanical description compared to the previously developed one-way chemo-electric to mechanical coupled model. Finally, by a qualitative comparison with experimental results, the validity of the fully coupled chemo-electro-mechanical model for electrical stimulation is demonstrated.
机译：某些聚电解质凝胶的特征在于在外部物理，化学或电刺激的影响下具有较大的溶胀或弯曲能力。在本文中，我们研究了由于外加电场而在聚电解质凝胶中发生的机理。通过应用扩展的和预定用于电刺激的化学-机电耦合模型，我们描述了凝胶和溶液中的浓度和电势以及凝胶中局部不同的溶胀和收缩。几何形状的局部变化是由凝胶和紧邻凝胶相的溶液之间的局部渗透压差决定的。除此作用外，局部凝胶结构域的变化还导致结合基团浓度的局部变化，从而导致移动离子的局部浓度发生变化。作为当前工作的重点，我们证明了与以前开发的单向化学电-机械耦合模型相比，完全耦合化学-电-机械描述的优越性。最后，通过与实验结果的定性比较，证明了完全耦合的化学-机电模型对电刺激的有效性。

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