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15 April 2016 A multi-physical model for charge and mass transport in a flexible ionic polymer sensor
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An ionic polymer material can generate electrical potential and function as a bio-sensor under a non-uniform deformation. Ionic polymer-metal composite (IPMC) is a typical flexible ionic polymer sensor material. A multi-physical sensing model is presented at first based on the same physical equations in the physical model for IPMC actuator we obtained before. Under an applied bending deformation, water and cation migrate to the direction of outside electrode immediately. Redistribution of cations causes an electrical potential difference between two electrodes. The cation migration is strongly restrained by the generated electrical potential. And the migrated cations will move back to the inner electrode under the concentration diffusion effect and lead to a relaxation of electrical potential. In the whole sensing process, transport and redistribution of charge and mass are revealed along the thickness direction by numerical analysis. The sensing process is a revised physical process of the actuation, however, the transport properties are quite different from those of the later. And the effective dielectric constant of IPMC, which is related to the morphology of the electrode-ionic polymer interface, is proved to have little relation with the sensing amplitude. All the conclusions are significant for ionic polymer sensing material design.
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Zicai Zhu, Kinji Asaka, Kentaro Takagi, Alvo Aabloo, and Tetsuya Horiuchi "A multi-physical model for charge and mass transport in a flexible ionic polymer sensor", Proc. SPIE 9798, Electroactive Polymer Actuators and Devices (EAPAD) 2016, 97982O (15 April 2016);

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