Electrospinning as a versatile method for fabricating coreshell, hollow and porous nanofibers

Electrospinnng is one of the most conventional methods for producing nano fibers in differentforms, such as core-shell hollow and porous nanofibers. these forms open new windows on innovativeapplications for nanofibers like ultra filtration, fuel cells, membranes, tissue engineering, catalysis anddrug delivery or release and nanofluidics and hydrogen storage. in the presented paper, developmentsin the electrospinning method toward fabrication of core-shell, and hollow and porous nanofibers arepresented. different spinnerets like coaxial and side by side are considered. furthermore, experiencedmethods for producing these novel fibers, such as nonsolvent-induced phase separation (nips) andphase separation, are described. it is concluded that there is rapid development and achievement in theimprovement of nanofibers for new applications, and electrospinning has become a forerunner in thisfield.