Coaxial electrospinning and emulsion electrospinning of core–shell fibers

Yarin, Alexander L.

doi:10.1002/pat.1781

Cited by 400 publications

(275 citation statements)

References 76 publications

(125 reference statements)

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“…Relying on an electric field to draw a thin jet out of a droplet of spinning solution protruding from a spinneret, [9][10][11][12][13] it is a low-cost, small-footprint spinning technology that is highly versatile and capable of producing core-sheath fibers that are exceptionally thin and that can carry a variety of functionalities, depending on the combination of core and sheath materials. [14][15][16][17][18][19] For instance, the impressive range of stimulus-response relations made possible by liquid crystalline self-assembly, uniquely combining fluidity with long-range order, 20 can be introduced into fibers by coaxial electrospinning with different liquid crystals as core materials. 14 In some cases it is even possible to electrospin liquid crystal-functionalized fibers from a uniform jet, relying on solvent evaporation-induced phase separation for in situ formation of the core-sheath structure.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional responsive fibers produced by dual liquid crystal core electrospinning

2015

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We demonstrate that coaxial electrospinning with more than one core channel, each containing a different type of liquid crystal, can be used to produce multifunctional fibers in a one-step process. They respond to more than one stimulus or with multiple threshold values, and the individual cores may feature different physical properties such as iridescent reflection in one core and birefringence in another. In order to ensure good fiber morphology and intact, unmixed and well separated cores, two important precautions must be taken. First, the fibers should not be collected on a hydrophilic substrate, as this will lead to severe fiber deformation and core mixing after collection, as a result of capillary forces from the water that condenses on the fiber during spinning. Second, the addition of surfactants to the polymer solution should be avoided, although it may appear beneficial for the spinning process as it reduces surface tension and increases conductivity. This is because the surfactant enters the liquid crystal core, possibly together with water in the form of inverse micelles, seriously degrading the performance of the liquid crystal.

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Section: Introductionmentioning

confidence: 99%

Multifunctional responsive fibers produced by dual liquid crystal core electrospinning

2015

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“…It has been applied broadly in controlling secondary structures of nanofibers, encapsulating drugs or biological agents into the polymer nanofibers, enclosing functional liquids within the fiber matrix, manipulating the size of self-assembled nanoparticles, preparing ultrafine fibers from concentrated polymer solutions previously thought to be unspinnable, and improving nanofibers' quality systematically (19,20). Coaxial electrospinning is able to expand the capability of electrospinning in fabricating nanofibers in two manners.…”

Section: Introductionmentioning

confidence: 99%

Drug-Loaded Zein Nanofibers Prepared Using a Modified Coaxial Electrospinning Process

Huang

Zou

et al. 2013

AAPS PharmSciTech

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Abstract. This study investigated the preparation of drug-loaded fibers using a modified coaxial electrospinning process, in which only unspinnable solvent was used as sheath fluid. With zein/ibuprofen (IBU) co-dissolving solution and N, N-dimethylformamide as core and sheath fluids, respectively, the drug-loaded zein fibers could be generated continuously and smoothly without any clogging of the spinneret. Field emission scanning electron microscopy and transmission electron microscopy observations demonstrated that the fibers had ribbon morphology with a smooth surface. Their average diameters were 0.94±0.34 and 0.67±0.21 μm when the sheath-to-core flow rate ratios were taken as 0.11 and 0.25, respectively. X-ray diffraction and differential scanning calorimetry verified that IBU was in an amorphous state in all fiber composites. Fourier transform infrared spectra showed that zein had good compatibility with IBU owing to hydrogen bonding. In vitro dissolution tests showed that all the fibers could provide sustained drug release files via a typical Fickian diffusion mechanism. The modified coaxial electrospinning process reported here can expand the capability of electrospinning in generating fibers and provides a new manner for developing novel drug delivery systems.

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“…DCPD enwrapped into polyacrylonitrile (PAN) using coelectrospin- HGBs Loaded epoxy/loaded amine 62% at 50°C [69] ning to form core-shell DCPD/PAN nanofibers [56,57]. The electrospinning was carried out in a labmade coaxial needle setup for generating the coreshell jet [59,60] by supplying a solution of 10 wt% PAN in dimethyl formamide (DMF) as the outer jet (shell) and the solution of 10 wt% DCPD in DMF as the inner jet (core). Self-healing carbon-fiber/epoxy composites were developed by incorporating this core-shell DCPD/ PAN nanofibers at laminate interfaces.…”

Section: Polymer Fibers As Self-healing Agent Containersmentioning

confidence: 99%

‘Containers’ for self-healing epoxy composites and coating: Trends and advances

Vijayan¹,

Al-Maadeed²

2016

Express Polym. Lett.

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Abstract.The introduction of self-healing functionality into epoxy matrix is an important and challenging topic. Various micro/nano containers loaded self-healing agents are developed and incorporated into epoxy matrix to impart self-healing ability. The current report reviews the major findings in the area of self-healing epoxy composites and coatings with special emphasis on these containers. The preparation and use of polymer micro/nano capsules, polymer fibers, hollow glass fibers/bubbles, inorganic nanotubes, inorganic meso-and nano-porous materials, carbon nanotubes etc. as self-healing containers are outlined. The nature of the container and its response to the external stimulations greatly influence the self-healing performance. The self-healing mechanism associated with each type of container and the role of container parameters on self-healing performance of self-healing epoxy systems are reviewed. Comparison of the efficiency offered by different types of containers is introduced. Finally, the selection of containers to develop cost effective and green self-healing systems are mentioned.

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Coaxial electrospinning and emulsion electrospinning of core–shell fibers

Cited by 400 publications

References 76 publications

Multifunctional responsive fibers produced by dual liquid crystal core electrospinning

Multifunctional responsive fibers produced by dual liquid crystal core electrospinning

Drug-Loaded Zein Nanofibers Prepared Using a Modified Coaxial Electrospinning Process

‘Containers’ for self-healing epoxy composites and coating: Trends and advances

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