Phase Separation During Electrospinning

A coaxial setup uses a multiple solution feed system that allows for the injection of one solution into another at the tip ofthe spinneret. The sheath fluid act as a carrier drawing in the inner fluid at the Taylor cone ofthe electrospinning jet. If the solutions are immiscible then a core-shell structure is usually observed. Miscible solutions, however, can result in porosity or a fiber with distinct phases due to phase separation during solidification ofthe fiber. 

How to control the surface pattern of polymer nanofibers Fortunately, this can be done by a variety of both bottom-up and top-down methods, with good effectiveness. For example, the phase separation related to the rapid evaporation of solvents with low boiling point during electrospinning can be a smart approach to fabricate polymer nanofibers with controlled porosity and... 

A novel method producing porous nanofibers is developed by Xia et al. In his work, TIPS happen between the solvent-rich and solvent-poor regions in the fiber during electrospinning by immersing the collector in a bath of hquid nitrogen. Finally with removing the solvent in vacuum, porous poly(slyrene) nanofibers are produced. In this method, phase separation into solvent-rich... 

Fig. 13 Porous nanofibers obtained via phase separation processes during electrospinning for mixtures of polylactide and polyethylene oxide [54]...

---