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. 2019 Jul 25;14:250. doi: 10.1186/s11671-019-3080-1

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Representative SEM observation of resultant silk fibers in each process. a Disassembled BS fibers after formic acid pretreatment, b oxidized BS fibers, and c the BS nanofibers with a diameter of 105 ± 27 nm. d Disassembled AS fibers after formic acid pretreatment, e oxidized AS fibers, and f the AS nanofibers with a diameter of 112 ± 33 nm. The contour length of BS and AS nanofibers is more than 1 μm