Chiang Mai Journal of Science

         Electrospun polyvinylpyrrolidone (PVP) (MW ~ 1.3 x 10⁶ g/mol) ultra-fine fibers

       with diameters from 200 to 1400 nm were successfully fabricated from the 20 %w/w PVP

       in the mixtures of ethanol and water. The effects of solvent compositions, the applied

voltages (10, 12, 14 and 16 kV) and the electrical polarities (both negative and positive) on

their diameters and morphology were investigated. Scanning electron micrographs revealed

that, to obtain neat fibers with small diameters, the positive polarity and high potential

should be applied. In addition, the fiber diameter increased with increasing the amount of

ethanol.