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A MODEL OF ION TRANSPORT IN CONJUGATED POLYMERS

  • JOHN BURNELL (a1)

Abstract

Understanding ion transport in conjugated polymers is essential for developing mathematical models of applications of these materials. Previous experimental studies have suggested that cation transport in a conjugated polymer could be either diffusion or drift controlled, with debate over which dominates. In this paper we present a new model of cation transport that explains most of the features seen in a set of recent experiments. This model gives good agreement with measured concentration profiles, except when the profile has penetrated the polymer by more than 60%. The model shows that both diffusion and drift processes can be present. An application of a micro-actuator based on a conjugated polymer is presented to demonstrate that this technology could be used to develop a micro-pump.

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References

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[1]Plieth, W., Bund, A., Rammelt, U., Neudeck, S. and Duc, L., “The role of ion and solvent transport during the redox process of conducting polymers”, Electro. Acta. 51 (2006) 23662372.
[2]Smela, E., “Conjugated polymer actuators for biomedical applications”, Adv. Mater. 15 (2003) 481494.
[3]Smela, E. and Gadegaard, N., “Volume change in polypyrrole studied by atomic force microscopy”, J. Phys. Chem. B 105 (2001) 93959405.
[4]Wang, X., Shapiro, B. and Smela, E., “Visualizing ion currents in conjugated polymers”, Adv. Mater. 16 (2004) 16051609.
[5]Wu, Y., Alici, G., Spinks, G. and Wallace, G., “Fast trilayer polypyrrole bending actuators for high speed applications”, Synth. Met. 156 (2006) 10171022.
[6]Xie, J., Shih, J., Lin, Q., Yang, B. and Tai, Y., “Dynamic simulation of a peristaltic micropump considering coupled fluid flow and structural motion”, J. Micromech. Microeng. 17 (2007) 220228.
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A MODEL OF ION TRANSPORT IN CONJUGATED POLYMERS

  • JOHN BURNELL (a1)

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