Investigation of Conical Spinneret in Generating More Dense and Compact Electrospun Nanofibers

Abstract

Abstract:Electrospinning is an important, widely used process to generate nanofibers. However, there is still an open window for different designs of both spinneret and collector electrodes to be investigated. This paper introduces the impact of new design of conical spinneret electrode on the generated electrospun nanofibers. In this work, the conical feeder is used to generate electrospun Poly(vinyl alcohol) (PVA) nanofibers, and being compared to the traditional needle feeder at the same processing conditions. The jet's mechanism is simulated using discrete bead model along with estimated calculations of both deposition area and fiber radius. The electric field distribution that is around the charged cone is analyzed. Based on both theoretical modeling and experimental measurements, a comparison of mean diameter, deposited area, and the thickness of generated nanofibers is presented related to both conical and needle electrodes. Conical feeder shows clearly compact nanofibers mat in terms of deposition area (spherical deposition of diameter~6 cm) up to half-area of needle deposited nanofibers with high fiber density for the same time of the process. Moreover, the conical electrode is found to have privilege in terms of productivity rate and operation time. This study can be useful in generating localized nanofibers within different applications, such as biomedical tissue scaffolds, textile, and sensors.

Electrospinning with curved nozzle spinneret for producing poly (vinyl Alcohol) nanomembrane for filtration

“…The PVA nano web was analyzed using FTIR spectroscopy to determine the distinctive peak of the produced membrane's functional group. The existence of hydroxyl (OH) and CH2 is shown by the 3300 cm −1 and 2942 cm −1 peaks, correspondingly, while the terminal polyvinyl groups and carbonyl (C=O) stretching bond are indicated by the 1088 cm −1 and 1735 cm −1 peaks, respectively [25]. The composition of the PVA nanofiber membrane is validated by FTIR analysis, which reveals the presence of a variety of functional groups.…”

Development of Poly(vinyl alcohol)–Chitosan Composite Nanofibers for Dual Drug Therapy of Wounds

“…Both natural and synthetic polymers can be used for nanofiber production . To make a nanofibrous mat with good mechanical properties and high immunogenicity, it must be combined with other synthetic or natural polymers like PVA (poly­(vinyl alcohol)), PCL (polycaprolactone), and PLA (poly­(lactic acid) . The composition, porosity, and morphology of electrospun nanofibers have a vital role in the prolonged drug release and prevention of the burst effect .…”

“… 2 To make a nanofibrous mat with good mechanical properties and high immunogenicity, it must be combined with other synthetic or natural polymers like PVA (poly(vinyl alcohol)), PCL (polycaprolactone), and PLA (poly(lactic acid). 3 The composition, porosity, and morphology of electrospun nanofibers have a vital role in the prolonged drug release and prevention of the burst effect. 4 Drug encapsulation into a polymer increases its efficiency for sustained release and for a longer period of time.…”

Preparation and Formation Mechanism of Electrospun Porous Beaded Fibers

“…Ultimately, it undergoes vigorous whipping motions because of the bending instability. [12][13][14][15][16] During this period, due to the radial repulsion of the same surface charge and the influence of surface tension along the jet velocity, axisymmetric instability may be generated, which will lead to the formation of beaded structure. 17 The scope of application of beaded fibers in various fields is determined by the number and diameter of the bead.…”