Asymptotic analysis of compression sensing in ionic polymer metal composites: The role of interphase regions with variable properties
Asymptotic analysis of compression sensing in ionic polymer metal composites: The role of interphase regions with variable properties
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离子聚合物金属复合材料压缩传感的渐近分析：具有可变特性的相间区域的作用
DOI：
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发表时间：
2021
影响因子：
1
通讯作者：
L. Bardella
中科院分区：
文献类型：
--
作者：
V. Volpini;L. Bardella
离子聚合物金属复合材料(IPMC)由两个贵金属电极组成，电镀一个被称为离聚体的电活性聚合物膜，它被包括可移动离子的溶剂电中和。IPMC的制造导致在电极旁边形成薄的相间区域，即所谓的复合层(CLS)，其中金属原子占据离聚体中的间隙位置。在这项工作中，我们扩展了我们小组先前在IPMC压缩传感方面所做的工作，以包括CLS的重要影响，其中电化学性能发生了很大的变化。在IPMC压缩传感中，穿透厚度位移的应用导致短路电响应，这里假设由线性化的修正Poisson-Nernst-Planck(PNP)偏微分方程组(PDE)来描述，通过线性动量平衡求出随时间演化的电势和移动离子浓度作为位移场的函数。化学发光系统中材料性质的变化要求在三个区域同时整合PDE的调控系统：膜和两个化学发光体系。为此，我们借助于匹配渐近展开的摄动方法。除了数值拉普拉斯逆变换外，这允许我们得到一个解析解，通过它我们建立了一个等效电路模型，阐明了IPMC传感行为的主要特征。通过与有限元分析的比较，验证和讨论了解析解，从而数值求解了考虑电化学应力的完全耦合线性动量平衡的非线性修正PNP系统。最后，我们通过评估CLS对一些关键参数的敏感性，对CLS在IPMC感知行为中的作用提供了一些见解。我们期望所获得的结果有助于优化的IPMC传感器的设计。
Ionic Polymer Metal Composites (IPMCs) consist of two noble metal electrodes plating an electroactive polymeric membrane, referred to as ionomer, which is electroneutralised by a solvent including mobile ions. The IPMC manufacturing leads to thin interphase regions next to the electrodes, the so-called Composite Layers (CLs), in which metal atoms occupy interstitial sites within the ionomer. In this work we extend previous efforts of our group on IPMC compression sensing to include the important effect of CLs, where large variations of the electrochemical properties occur. In IPMC compression sensing the application of a through-the-thickness displacement leads to a shortcircuit electric response, here assumed to be governed by a linearised modified Poisson-Nernst-Planck (PNP) system of partial differential equations (PDEs), to be solved for the time-evolving electric potential and mobile ions concentration as functions of the displacement field evaluated through the linear momentum balance. The variation of material properties in the CLs requires the simultaneous integration of the governing system of PDEs in three regions: the membrane and the two CLs. To this purpose, we resort to the perturbative method of matched asymptotic expansions. Except for a numerical inverse Laplace transform, this allows us to obtain an analytical solution through which we establish an equivalent circuit model elucidating the main features of the IPMC sensing behaviour. We validate and discuss the analytical solution through comparison with finite element analyses, whereby we also numerically solve the nonlinear modified PNP systems fully coupled with the linear momentum balance accounting for the electrochemical stresses. We finally provide some insight into the role of CLs in the IPMC sensing behaviour, by assessing its sensitivity to some key parameters. We expect the obtained results to aid the design of optimised IPMC sensors.
DOI：
10.1016/j.ijengsci.2020.103227
发表时间：
2020-04-01
影响因子：
6.6
作者：
Boldini, Alain;Porfiri, Maurizio
通讯作者：
Porfiri, Maurizio