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. Author manuscript; available in PMC: 2019 Jun 22.
Published in final edited form as: Chem Rev. 2019 Mar 27;119(8):5298–5415. doi: 10.1021/acs.chemrev.8b00593

Figure 21.

Figure 21.

SEM images of the (A) surface and (B) core of highly porous PLA nanofibers which were produced by electrospinning a 12.1 wt % PLA solution in dichloromethane. (C) SEM image of porous PS nanofibers prepared by electrospinning the jet into liquid nitrogen, followed by drying in vacuum. The inset gives an SEM image of the broken end of a nanofiber at a higher magnification, confirming that the fiber was porous throughout. (D) TEM image of the porous PS nanofiber with the insets at a higher magnification. (A and B) Reprinted with permission from ref 383. Copyright 2018 American Chemical Society. (C and D) Reprinted with permission from ref 389. Copyright 2006 American Chemical Society.