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A self-powered drug delivery system based on cellulose–polypyrrole (PPy) composite film was developed. The cellulose–PPy composite film was prepared by deposition of drug-contained PPy film on the inner and outer surfaces of a porous cellulose film. After coating a thin layer of active metal such as magnesium on the one side of the composite film, the drug stored in the PPy film can be released autonomously...
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