High-quality polypyrrole membranes have been made by an electrochemical method. These membranes were robust and had a high conductivity (typically 60 S cm-1). Investigations into the transport properties of these membranes using copper(II) as the transporting species demonstrated the use of applied potential to control the rate of transport. Differences of two orders of magnitude in the permeability of copper across the membrane were found.
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