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SEM images of nanofibers with different magnifying (B1-B4). B1: SEM image of nanofiber with magnifying 1000 X. B2: SEM image of nanofiber with magnifying 5000 X. B3: SEM image of nanofiber with magnifying 10,000 X. B4: SEM image of nanofiber with magnifying 20,000 X.
