Nanofibers are fibers with diameters in the nanometer range. They can be generated from different polymers and hence have different physical properties and application potentials. Examples of natural polymers include collagen, cellulose and polysaccharides such as chitosan and alginate. Examples of synthetic polymers include PLA, PCL, PU, PLGA) and PEVA. The diameters of nanofibers depend on the type of polymer used and the method of production and can vary from under thirty nm up to a few hundred nm. All polymer nanofibers are unique for their large surface area-to-volume ratio, high porosity, appreciable mechanical strength, and flexibility in functionalization compared to their microfiber counterparts.

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