Sudden solvent evaporation in bubble electrospinning for fabrication of unsmooth nanofibers

Abstract

Solvent fraction in a multiple solvent system plays a great important for controlling fiber morphology in the bubble electrospinning. The sudden release of air pressure when a polymer bubble is broken and an extremely high velocity of jets are two main factors for solvent evaporation, which can be used for fabrication of unsmooth fibers.

Vibration of an axially moving jet in a dry spinning process

“…Table 1 gives the experimental data with different nozzle shape. In Table 1 we can see that the CA fiber's fiber fineness for two samples produced by rectangle nozzle are, respectively, about 7 dtex and 8.5 dtex, that means the fiber diameters: d 2 > d 1 , according to equation (16), we predict that E 1max > E 2max , which is in full agreement with the experimental data given in Table 1. For the nozzle with the regular triangle shape, a similar result is obtained.…”

“…where d is CA fiber's diameter, a and b are constants, which can be determined experimentally. Equation (16) implies that a smaller fiber radius results in a larger elongation of the CA fiber. Table 1 gives the experimental data with different nozzle shape.…”

Needle’s vibration in needle-disk electrospinning process: Theoretical model and experimental verification

“…5,6 However, electrospinning, as the most popular method of manufacturing nanofiber, is limited by the low nanofiber productivity. [7][8][9] To overcome the shortcoming, many new technologies for mass-production of nanofibers were appeared in open literatures, for examples, the bubble electrospinning, [10][11][12][13][14][15][16][17] the bubbfil spinning, [18][19][20] the wire electrode electrospinning, 21 the bowl edge electrode electrospinning, 22 and the needle-disk electrospinning. 23 The needle-disk electrospinning includes a needle-disk, a solution vessel, a motor, a collector and a voltage supply.…”

Silkworm (Bombyx mori) cocoon vs. wild cocoon multi-layer structure and performance characterization

“…In addition, the inner layers have a much higher fracture stress and lower elongation at break than that of outer layers for silkworm cocoons. Air permeability and moisture vapor transmission rate of silkworm cocoons are shown to be more excellent compared with that of electrospinning membranes [19][20][21][22][23][24][25], a math-biomimicking method was proposed in [25], and the new macromolecular electrospinning [25][26][27] is a promising technology to mimic cocoon structure to fabricate nanoscale artificial hierarchy in future, which has some special properties, for example, extremely high permeability, due to extremely high geometrical potential or surface energy [28][29][30][31].…”