MOBILITY OF ALKALI CATIONS IN POLYPYRROLE-DODECYL SULFATE

Due to the immobility of the large dodecyl sulfate anion, the mobile i ons in polypyrrole-dodecyl sulfate are small ions from the solution. V irgin PP-dodecyl sulfate does not contain other ionic species, but alr eady the first reduction causes the incorporation of cations into the membrane. Using in situ AC conductimetry on a double-band platinum ele ctrode, we show that the insertion of cations from the solution into t he PP membrane proceeds as a non-conducting zone advancing from the so lution interface toward the substrate. The model allows to estimate io n mobilities in the membrane giving 8.6x10(-7) cm(2)s(-1)V(-1) for K+.