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(a) The porous PAN nanofibers created by quickly freezing the newly electrospun fibers with liquid nitrogen [150]. Copyright 2006, American Chemical Society. (b) The electrospinning of poly amid 6/66 into a water bath, which was later collected with drawing rollers [151]. Copyright 2018, Springer. (c) The nanofibers contain iron oxide nanoparticles for easy collection from water baths using a magnetic bar [152]. Copyright 2022, Elsevier.
