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Scanning electron micrographs of electrospun nanofiber composite membranes prepared at Vanderbilt University. (a) Top down view of a dual nanofiber mat composed of Nafion and polyphenylsulfone nanofibers; (b) Freeze-fractured cross section of a membrane where Nafion perfluorosulfonic acid polymer is surrounding nanofibers of polyphenylsulfone.
