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  • 1.
    Kostela, Johan
    et al.
    Uppsala universitet, Fysikalisk-kemiska institutionen.
    Almgren, Mats
    Electrochemical behaviour of an amphiphilic viologen incorporated in a stacked bilayer systemIn: Journal of Electroanalytical Chemistry, ISSN 0022-0728, E-ISSN 1873-2569Article in journal (Refereed)
  • 2.
    Kostela, Johan
    et al.
    Fysikalisk-kemiska institutionen, Uppsala universitet.
    Elmgren, Maja
    Uppsala universitet.
    Hansson, Per
    Uppsala universitet.
    Almgren, Mats
    Uppsala universitet.
    Electrochemical properties of an amphiphilic viologen in differently charged micelles2002In: Journal of Electroanalytical Chemistry, ISSN 0022-0728, E-ISSN 1873-2569, Vol. 536, no 1-2, p. 97-107Article in journal (Refereed)
    Abstract [en]

    The electrochemical properties of N-tetradecyl-N′-methylviologen (TMV) in differently charged micelles were studied with a glassy carbon electrode using electrochemical techniques. The redox potential varied depending on the charge of the surrounding surfactants. When the viologen was situated in cationic micelles the redox potential for the 2+/1+ reaction was more positive than when situated in negatively charged micelles. The non-ionic micelles destabilised the 2+-state most showing the highest redox potentials. From studies of several different cationic micelles it was concluded that the most important parameter for the redox potential was the surface charge density. A calculation based on a simple model confirmed this. Other interactions also influenced the stability of the redox states. Adsorption, desorption and reorganisation of the surfactants at the electrode surface caused capacitive currents. To control the nonfaradaic current, differential pulse voltammetry (DPV) was used in addition to cyclic voltammetry.

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