Ion Transport in Polymer Composites with Non-Uniform Distributions of Electronic Conductors

Dobashi, Yuta; Fannir, Adelyne; Farajollahi, Meisam; Mahmoudzadeh, Ali; Usgaocar, Ashwin; Yao, Dickson; Nguyen, Giao T.M.; Plesse, Cédric; Vidal, Frédéric; Madden, John D.

doi:10.1016/j.electacta.2017.06.141

Cited by 10 publications

(3 citation statements)

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“…The resistance of the PEDOT layer of the top and bottom bilayer is derived from the difference in their impedance at low and high frequency. The ionic conductivity values for the top and bottom layers are similar to and slightly lower than the 0.04±0.002 S m −1 measured by Dobashi et al [68], in that case using aqueous LiTFSI as the electrolyte. As can be seen from table 2, there is a slight difference between the ionic conductivity of the top and the bottom PEDOT electrodes, perhaps indicating a small effect of the asymmetry on the ionic conductivity.…”

Section: Electrochemical Propertiessupporting

confidence: 81%

“…A number of properties limit current and charging speed. Polymer ionic conductivity is one of these factors [68] (refer to equations (1), ( 2), ( 4)), which in turn is a factor that can limit strain rate and bending speed of the trilayer actuator. The PEDOT ionic conductivity was determined using an electrochemical impedance spectroscopy measurement according to a procedure described previously [68,69] (refer to supplementary information figure SII1).…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

“…Polymer ionic conductivity is one of these factors [68] (refer to equations (1), ( 2), ( 4)), which in turn is a factor that can limit strain rate and bending speed of the trilayer actuator. The PEDOT ionic conductivity was determined using an electrochemical impedance spectroscopy measurement according to a procedure described previously [68,69] (refer to supplementary information figure SII1). It has been shown that there is an asymmetry between the top and the bottom PEDOT electrodes in a trilayer actuator fabricated by vapor phase polymerization [67].…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

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Nonlinear dynamic modeling of ultrathin conducting polymer actuators including inertial effects

Nguyen

Dobashi

Soyer

et al. 2018

Smart Mater. Struct.

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Trilayer conducting polymer (CP) actuators are potential alternatives to piezoelectric and electrostatic actuators due to their large strain, and recently demonstrated operation at hundreds of Hertz. However, these actuators exhibit nonlinear electrical and mechanical properties as a function of their oxidation state, when operated over their full strain range, making it more challenging to accurately predict their mechanical behavior. In this paper, an analytical multiphysics model of the CP actuators is proposed to predict their nonlinear dynamic mechanical behavior. To demonstrate the accuracy of the model, a trilayer actuator composed of a solid polymer electrolyte sandwiched between two poly(3,4-ethylenedioxythiophene) (PEDOT) electrodes was fabricated and characterized. This system consists of an electrical subsystem represented by an RC equivalent circuit, an electro-mechanical coupling matrix, and a mechanical subsystem described by using a rigid finite element method. The electrical conductivity and the volumetric capacitance, an empirical strain-to-charge ratio, and Young's modulus of the actuator as a function of the PEDOT electrode charge state were also implemented into the model, using measured values. The proposed model was represented using a bond graph formalism. The concordance between the simulations and the measurements confirmed the accuracy of the model in predicting the nonlinear dynamic electrical and mechanical response of the actuators. In addition, the information extracted from the model also provided an insight into the critical parameters of the actuators and how they affect the actuator efficiency, as well as the energy distribution including dissipated, stored, and transferred energy. These are the key parameters for designing, optimizing, and controlling the actuation behavior of a trilayer actuator.

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Section: Electrochemical Propertiessupporting

confidence: 81%