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(A) Production yields of silk nanofibril, (B) FE-SEM images of the degummed and ultrasonicated silk fibers, (C) FE-SEM images of the silk nanofibrils, (D) Mean diameter of the silk nanofibrils, (E) FTIR spectra, and (F) crystallinity index of the silk nanofibrils produced at various ultrasonication times; (a) 3 h, (b) 6 h, (c) 9 h, and (d) 12 h.
