Single-needle electrospinning of PVA hollow nanofibers for core–shell structures

Abstract

As one of the most promising nanostructures, core-/shell-structured nanofiber has been widely used in many applications such as self-healing, drug and gene delivery, and tissue engineering. Hollow or core-/shell-structured nanofibers have generally been produced using single-needle and/or coaxial electrospinning methods. This method involves occurrence of varying sizes of bead formation. In this study, a single-needle electrospinning technique is applied for investigating the processing parameters affecting the fiber morphology and the bead formation in order to understand this innovative technique for further studies. Results showed that the parameters such as the voltage difference, collector distance and solution concentration have significant effects on the shell fiber morphology and the occurrence of bead formation.

A Review on the Secondary Surface Morphology of Electrospun Nanofibers: Formation Mechanisms, Characterizations, and Applications

“…Hollow fibers have attracted growing awareness of researchers due to their numerous applications, including sensors, catalysts carriers, gas storage, wave absorption materials, energy harvesting, thermal insulation composite materials, drug release, environmental protection, and nanofluidics . Hollow fibers can be generated from various polymers such as polyvinylpyrrolidone (PVP), PVDF, PAN, PVA, poly(e‐caprolactone), polyethersulfone, PVC, polyethersulfone, polyetherimide, polyimides, and polysulphone …”

Nanoengineered electrospun fibers and their biomedical applications: a review

“…Dogan et al described a single-needle electrospinning technique based on bead formation for the production of hollow PVA nanofibers. Results showed that parameters such as the voltage, collector distance and solution concentration had significant effect on shell morphology [64]. Saetia et al [45]); (b) SEM image of electrospun PS fibers from 15% PS solution in BuOH/DCM 1/3, spinning at 1.5 ml/h, 12 kV and 15 cm distance (adapted from ref.…”

An Estimate of the Onset of Beadless Character of Electrospun Nanofibers Using Rheological Characterization

“…However, in some cases an appearance of beads supports an application of nanofibers, as in the case of improving adhesion [ 1 , 2 ]. Bead formation strongly depends on various factors such as voltage [ 9 ], tip-to-collector distance [ 9 ], and additives [ 10 , 11 ]. A choice of solvents also contributes to this phenomenon [ 10 , 12 ].…”