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Schematic to fabricate an electrically responsive microreservoir. (a) Fabrication of AAO membrane. (b) A thin gold layer on top and side wall of the membrane. (c) Polypyrrole electropolymerized on gold layer, and electrically responsive nanoporous membrane was fabricated at the oxidation state. (d) Reversible change of pore size (and drug release rate) between oxidation and reduction states. Copyright© with permission from 2011 American Chemical Society [11].
