Abstract
Ion and solvent transport in the conjugated polymer actuator material, polypyrrole doped with the immobile anion dodecyl benzene sulphonate, has been investigated by simultaneous cyclic voltammetry and Electrochemical Quartz Crystal Microbalance measurements. The purpose was to elucidate the precise nature of the mobile species during redox cycling, and to seek confirmation for the osmotic mechanism of actuation. Three testable aspects of the model were confirmed: The number of inserted H2O molecules decreases with electrolyte concentration; at the same time the mechanism gradually changes from almost pure cation transport to ca. equal amount of anion transport; exchanging Br− for Cl− ions has only negligible effect at lower concentrations at equal osmotic pressures. Approximately, 4 H2O molecules are tightly bound to each Na+ ion at concentrations <1 M.
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