Coupled chemo-electro-mechanical formulation for ionic polymer gels––numerical and experimental investigations

Articles you may be interested inMeasurement of insulating and dielectric properties of acrylic elastomer membranes at high electric fields J. Appl. Phys. 111, 024904 (2012) The two-dimensional model incorporates highly conductive particles randomly distributed in the electrode area. Traditionally, these kinds of electrodes were simulated with boundary conditions representing flat electrodes with a large dielectric permittivity at the polymer boundary. This model enables the design of electrodes with complicated geometrical patterns. In the experimental section, several transducers are fabricated using the DAP process on Nafion 117 membranes. The architecture of the high surface area electrodes in these samples is varied. The concentration of the high surface area RuO 2 particles is varied from 30 vol% up to 60 vol% at a fixed thickness of 30 lm, while the overall thickness of the electrode is varied from 10 lm up to 40 lm at a fixed concentration of 45%. The flux and charge accumulation in the materials are measured experimentally and compared to the results of the numerical simulations. Trends of the experimental and numerical investigations are in agreement, while the computational capacity is limiting the ability to add sufficient amount of metal particle to the electrode in order to match the magnitudes.

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“…27 The formulation allows the computation of the space-time distribution of the electric potential and ionic concentration in the material.…”

Section: Modelingmentioning

confidence: 99%

“…This paper is organized as follows: In Sec. II the electrochemical model developed by Wallmersperger et al 16,27 is presented in a short form along with the additions needed for two-dimensional case. In Sec.…”

mentioning

confidence: 99%

High surface area electrodes in ionic polymer transducers: Numerical and experimental investigations of the electro-chemical behavior

Akle

Habchi

Wallmersperger

et al. 2011

Journal of Applied Physics

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“…The following multi-field model describes the chemo-electrical behavior inside an ionic polymer transducer [14,15]. The formulation is capable of computing the ion distribution and the electric potential in the material as a function of space and time.…”

Section: Modelingmentioning

confidence: 99%

“…Theoretical models providing a direct comparison between experiment and theory can be generally separated into phenomenological models based on curve fits of experimental data [10,11,12,13] and physical models that attempt to predict the material response from governing equations [7,14,15,16].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical response in ionic polymer transducers: An experimental and theoretical study

Wallmersperger

Akle

Leo

et al. 2008

Composites Science and Technology

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“…A coupled chemoelectrical formulation describing the ion distribution and the electric potential in the material is applied 11,12 to compute the charge density as a function of space and time.…”

Section: Computational Model Of Ion Transportmentioning

confidence: 99%

Transport modeling in ionomeric polymer transducers and its relationship to electromechanical coupling

Wallmersperger

Leo

Kothera

2007

Journal of Applied Physics

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110

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Ionomeric polymer transducers consist of an ion-conducting membrane sandwiched between two metal electrodes. Application of a low voltage (<5V) to the polymer produces relatively large bending deformation (>2% strain) due to the transport of ionic species within the polymer matrix. A computational model of transport and electromechanical transduction is developed for ionomeric polymer transducers. The transport model is based upon a coupled chemoelectrical multifield formulation and computes the spatiotemporal volumetric charge density profile to an applied potential at the boundaries. The current induced in the polymer is computed using the isothermal transient ionic current associated with surface charge accumulation at the electrodes induced by nonzero volumetric charge density within the polymer. The stress induced in the polymer is assumed to be a summation of linear and quadratic functions of the volumetric charge density. Euler-Bernoulli beam mechanics are used to compute the bending deflection of the transducer to an applied potential. The diffusion coefficient and permittivity of the polymer is identified from the measured current density to a step change in the applied potential. A comparison between the measured data and the predicted response demonstrates that this model accurately predicts the current discharge due to the applied potential at voltages over the range of 50–500mV. Furthermore, the measured strain response is accurately predicted by determining the two parameters of the mechanics model that relates volumetric charge density to induced stress. The coupled model with parameters identified from the step response analysis is used to predict the harmonic response of the current and the bending strain. Comparisons between measured data and simulations illustrate that the coupled transport-mechanics model accurately predicts the magnitude and trends associated with the current response and strain output. Excellent agreement is obtained at excitation periods above approximately 1s while good agreement is obtained at longer excitation periods. The transport model highlights the importance of the asymmetry that develops at large applied potentials and long excitation periods in the volumetric charge density due to the fixed anionic species in the polymer.

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Coupled chemo-electro-mechanical formulation for ionic polymer gels––numerical and experimental investigations

Cited by 136 publications

References 7 publications

High surface area electrodes in ionic polymer transducers: Numerical and experimental investigations of the electro-chemical behavior

High surface area electrodes in ionic polymer transducers: Numerical and experimental investigations of the electro-chemical behavior

Electrochemical response in ionic polymer transducers: An experimental and theoretical study

Transport modeling in ionomeric polymer transducers and its relationship to electromechanical coupling

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