Electrospinning of polymer solutions: An analysis of instability in a thinning jet with solvent evaporation

Deshawar, Dharmansh; Gupta, Karan; Chokshi, Paresh

doi:10.1016/j.polymer.2020.122656

Cited by 30 publications

(12 citation statements)

References 39 publications

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“…The evaporation of the solvent is inhomogeneous in the radial direction of the jet/fiber [ 29 , 30 ]. As an example, Figure 3 a,b reveal that the solidification/drying of the jet starts from the surface of the jet (shell) and gradually moves into the core.…”

Section: Resultsmentioning

confidence: 99%

Stimulus-Responsive Shrinkage in Electrospun Membranes: Fundamentals and Control

Fang

Wang

et al. 2021

Micromachines

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Shrinkage is observed in many electrospun membranes. The stretched conformation of the macromolecular chains has been proposed as the possible cause. However, so far, our understanding of the fundamentals is still qualitative and cannot provide much help in the shrinkage control. In this paper, based on the crimped fibers after stimulus-induced shrinkage, a clear evidence of buckling, the gradient pre-strain field in the cross-section of the electrospun fibers, which is the result of a gradient solidification field and a tensile force in the fibers during electrospinning, is identified as the underlying mechanism for the stimulus-induced shrinkage. Subsequently, two buckling conditions are derived. Subsequently, a series of experiments are carried out to reveal the influence of four typical processing parameters (namely, the applied voltage, solution concentration, distance between electrodes, and rotation speed of collector), which are highly relevant to the formation of the gradient pre-strain field. It is concluded that there are some different ways to achieve the required shrinkage ratios in two in-plane directions (i.e., the rotational and transverse directions of the roller collector). Some of the combinations of these parameters are more effective at achieving high uniformity than others. Hence, it is possible to optimize the processing parameters to produce high-quality membranes with well-controlled shrinkage in both in-plane directions.

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Section: Resultsmentioning

confidence: 99%

Stimulus-Responsive Shrinkage in Electrospun Membranes: Fundamentals and Control

Fang

Wang

et al. 2021

Micromachines

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“…Moreover, the hydrophilic components in the spinning solution would also hinder the volatilization of the solvent in the electrospinning process, which should be an important reason for the formation of beads. 44,45 3.2. XRD analysis XRD studies were performed to conrm the crystalline structures of the neat PCL/PVP and ScLE-loaded microbers (Fig.…”

Section: Resultsmentioning

confidence: 99%

Sabina chinensis leaf extracted and in situ incorporated polycaprolactone/polyvinylpyrrolidone electrospun microfibers for antibacterial application

et al. 2021

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“…The high viscosity of the solution limits the stretching of the jet during spinning, which is conducive to the formation of larger diameter. On the contrary, the high conductivity of the solution has also been proven to promote diameter reduction ( Deshawar et al, 2020 ). The design of different diameters is to ensure that the outer layer has a good encapsulation effect and a high surface area ratio of drug loading layer, in order to facilitate the delivery and release of the drug.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Antimicrobial Multilayered Nanofibrous Scaffolds-Loaded Drug via Electrospinning for Biomedical Application

Liu

Jia

Ouyang

et al. 2021

Front. Bioeng. Biotechnol.

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Nanofibers prepared by biobased materials are widely used in the field of biomedicine, owing to outstanding biocompatibility, biodegradable characters, and excellent mechanical behavior. Herein, we fabricated multilayered nanofibrous scaffolds in order to improve the performance of drug delivery. The composite layer-by-layer scaffolds were incorporated by hydrophobic poly(l-lactic acid) (PLA): polycaprolactone (PCL) and hydrophilic poly(vinyl alcohol) (PVA) nanofibers via multilayer electrospinning. Morphological and structural characteristics of the developed scaffolds measured by scanning electron microscopy (SEM), and transmission electron microscopy (TEM) confirmed smooth and uniform fibers ranging in nanometer scale. The differences in contact angles and Fourier transform infrared spectrum (FTIR) between single-layered PVA nanofibers and multilayered scaffolds verified the existence of PLA: PCL surface. In vitro biodegradable and drug release analysis depicted multilayered scaffolds had good biodegradability and potential for medical application. Due to the model drug incorporation, scaffolds exhibited good antibacterial activity against Escherichia coli and Staphylococcus aureus by the zone of inhibition test. These results revealed that the multilayered scaffolds were proved to be desirable antibacterial materials for biomedical application.

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Electrospinning of polymer solutions: An analysis of instability in a thinning jet with solvent evaporation

Cited by 30 publications

References 39 publications

Stimulus-Responsive Shrinkage in Electrospun Membranes: Fundamentals and Control

Stimulus-Responsive Shrinkage in Electrospun Membranes: Fundamentals and Control

Sabina chinensis leaf extracted and in situ incorporated polycaprolactone/polyvinylpyrrolidone electrospun microfibers for antibacterial application

Fabrication of Antimicrobial Multilayered Nanofibrous Scaffolds-Loaded Drug via Electrospinning for Biomedical Application

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