The mechanisms of PAN electrospinning nanofibers based on the effect of surface charges

Abstract

In electrospinning, the addition of salts results in a higher charge density on the surface of jet. The theoretical analysis shows that the relationship between radius r of jet and the axial distance z from nozzle follows an allometric law in the form r ~ z-0.5 in case of full surface charge, and the scaling exponent becomes larger when the jet has part surface charge. Theoretical analysis also showed that the electricity potential with high content of LiCl descends more sharply than low content LiCl during the charged fibers moving. LiCl was chosen to confirm the theory. The experimental data agreed very well with our theoretical analysis by a series of experiments. Moreover, the structures of nanofibers with LiCl were investigated.