Ion and solvent Transport in Polypyrrole: Experimental Test of Osmotic Model

Yogambigai Velmurugu (Invited author), Steen Skaarup (Invited author)

    Research output: Contribution to journalConference articleResearchpeer-review

    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. Ca. 4 H2O molecules are tightly bound to each Na+ ion at concentrations <1M.
    Original languageEnglish
    JournalIonics
    Volume11
    Issue number5-6
    Pages (from-to)370-374
    ISSN0947-7047
    DOIs
    Publication statusPublished - 2005
    EventInternational Conference on Fucntional Materials and Devices - Kuala Lumpur, Malaysia
    Duration: 6 Jun 20058 Jun 2005

    Conference

    ConferenceInternational Conference on Fucntional Materials and Devices
    CountryMalaysia
    CityKuala Lumpur
    Period06/06/200508/06/2005

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