Bending of polyelectrolyte membrane platinum composites by electric stimuli

Asaka, Kinji; Oguro, Keisuke

doi:10.1016/s0022-0728(99)00458-1

Cited by 202 publications

(122 citation statements)

References 15 publications

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“…Using computational micromechanics Weiland and Leo investigate the effect that ion-ion interaction, pendant chain stiffness, and cluster surface energy have on the charge redistribution within the cluster. Their findings support the macroscopic predictions of the previous models, 14,26,28,29,33,34 providing justification for the transport concepts used in these larger-scale models.…”

Section: Introductionsupporting

confidence: 83%

Modeling the electrical impedance response of ionic polymer transducers

Farinholt

Leo

2008

Journal of Applied Physics

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Articles you may be interested inA physics-based model of the electrical impedance of ionic polymer metal composites J. Appl. Phys. 111, 124901 (2012) An analytical study is presented that investigates the electrical impedance response of the ionic polymer transducer. Experimental studies have shown that the electromechanical response of these active materials is highly dependent upon internal parameters such as neutralizing counterion, diluent, electrode treatment, as well as environmental factors such as ambient temperature. Further examination has shown that these variations are introduced predominantly through the polymer's ability to convert voltage into charge migration. This relationship can easily be represented by the polymer's electrical impedance as measured across the outer electrodes of the transducer. In the first half of this study an analytical model is developed which predicts the time and frequency domain characteristics of the electrical response of the ionic polymer transducer. Transport equations serve as the basis for this model, from which a series of relationships are developed to describe internal potential, internal charge density, as well as surface current. In the second half of this study several analytical studies are presented to understand the impact that internal parameters have on the polymer's electrical response, while providing a conceptual validation of the model. In addition to the analytical studies several experimental comparisons are made to further validate the model by examining how well the model predicts changes in temperature, viscosity and pretention within the ionic polymer transducer.

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Section: Introductionsupporting

confidence: 83%

Modeling the electrical impedance response of ionic polymer transducers

Farinholt

Leo

2008

Journal of Applied Physics

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“…Fick's first law is included in Eq. (11). Tadokoro model divides the transport process into two separate phases.…”

Section: Tadokoro Modelmentioning

confidence: 99%

Dynamic model of ion and water transport in ionic polymer-metal composites

et al. 2011

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In the process of electro-mechanical transduction of ionic polymer-metal composites (IPMCs), the transport of ion and water molecule plays an important role. In this paper, the theoretical transport models of IPMCs are critically reviewed, with particular emphasis on the recent developments in the latest decade. The models can be divided into three classes, thermodynamics of irreversible process model, frictional model and Nernst-Planck (NP) equation model. To some extent the three models can be transformed into each other, but their differences are also obvious arising from the various mechanisms that considered in different models. The transport of ion and water molecule in IPMCs is compared with that in membrane electrode assembly and electrodialysis membrane to identify and clarify the fundamental transport mechanisms in IPMCs. And an improved transport model is proposed and simplified for numerical analysis. The model considers the convection effect rather than the diffusion as the major transport mechanism, and both the self-diffusion and the electroosmosis drag are accounted for in the water flux equation

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“…The most studied IPMC material is Nafion, (a perfluorinated ionomer) membrane, coupled with electrochemically plated Pt electrodes on both sides. The actuation mechanism of this composite was described in terms of electro-osmotic water transport driven by solvated cations and charging of the double layer at the interface between Nafion and platinum [2b], or an interfacial stress (Nafion/Pt) inducing the composite motion [3]. Recently, a general model was proposed taking into account both the hydraulic and the electrostatic effects in the IPMC [4,5].…”

Section: Introductionmentioning

confidence: 99%

Novel Actuating System Based on a Composite of Single-Walled Carbon Nanotubes and an Ionomeric Polymer

2003

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We report the fabrication and characterization of a novel composite material based on single walled carbon nanotubes (SWNT)s and the ionomeric polymer Nafion. SWNTs were airbrushed from a chloroform suspension onto both sides of a Nafion membrane (180 µm) and the electromechanical properties of the composite material were explored. The outer layers of carbon nanotubes acted as electrodes in order to pass electrical current through the system while the mechanical response was monitored. Under this design, the mechanical response could be characterized, with respect to the electrical signal, as a function of: voltage, waveform (AC vs. DC), and frequency (AC). Data was also compiled to gauge the effect of size and thickness of each individual layer of the system. The reference samples (graphite-Nafion and sputtered goldNafion) did not exhibit mechanical actuation at the same conditions. An analytical model for current decay was considered that is in agreement with the experimental data. Bi-exponential decay with a long time component was found for bias, which is above the actuating threshold. That was explained in terms of increasing of the water dielectric constant and polymer-SWNT interface area. The possible mechanisms of the actuation in this novel composite are discussed.

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Bending of polyelectrolyte membrane platinum composites by electric stimuli

Cited by 202 publications

References 15 publications

Modeling the electrical impedance response of ionic polymer transducers

Modeling the electrical impedance response of ionic polymer transducers

Dynamic model of ion and water transport in ionic polymer-metal composites

Novel Actuating System Based on a Composite of Single-Walled Carbon Nanotubes and an Ionomeric Polymer

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