The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Sauro Succi - One of the best experts on this subject based on the ideXlab platform.
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effects of orthogonal rotating electric fields on Electrospinning Process
Physics of Fluids, 2017Co-Authors: Marco Lauricella, Federico Cipolletta, Giuseppe Pontrelli, Dario Pisignano, Sauro SucciAbstract:Electrospinning is a nanotechnology Process whereby an external electric field is used to accelerate and stretch a charged polymer jet, so as to produce fibers with nanoscale diameters. In quest of a further reduction in the cross section of electrified jets hence of a better control on the morphology of the resulting electrospun fibers, we explore the effects of an external rotating electric field orthogonal to the jet direction. Through intensive particle simulations, it is shown that by a proper tuning of the electric field amplitude and frequency, a reduction of up to a 30% in the aforementioned radius can be obtained, thereby opening new perspectives in the design of future ultra-thin electrospun fibers. Applications can be envisaged in the fields of nanophotonic components as well as for designing new and improved filtration materials.
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effects of orthogonal rotating electric fields on Electrospinning Process
arXiv: Computational Physics, 2016Co-Authors: Marco Lauricella, Federico Cipolletta, Giuseppe Pontrelli, Dario Pisignano, Sauro SucciAbstract:Electrospinning is a nanotechnology Process whereby an external electric field is used to accelerate and stretch a charged polymer jet, so as to produce fibers with nanoscale diameters. In quest of a further reduction in the cross section of electrified jets hence of a better control on the morphology of the resulting electrospun fibers, we explore the effects of an external rotating electric field orthogonal to the jet direction. Through extensive particle simulations, it is shown that by a proper tuning of the electric field amplitude and frequency, a reduction of up to a $30 \%$ in the aforementioned radius can be obtained, thereby opening new perspectives in the design of future ultra-thin electrospun fibres. Applications can be envisaged in the fields of nanophotonic components as well as for designing new and improved filtration materials.
Dario Pisignano - One of the best experts on this subject based on the ideXlab platform.
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effects of orthogonal rotating electric fields on Electrospinning Process
Physics of Fluids, 2017Co-Authors: Marco Lauricella, Federico Cipolletta, Giuseppe Pontrelli, Dario Pisignano, Sauro SucciAbstract:Electrospinning is a nanotechnology Process whereby an external electric field is used to accelerate and stretch a charged polymer jet, so as to produce fibers with nanoscale diameters. In quest of a further reduction in the cross section of electrified jets hence of a better control on the morphology of the resulting electrospun fibers, we explore the effects of an external rotating electric field orthogonal to the jet direction. Through intensive particle simulations, it is shown that by a proper tuning of the electric field amplitude and frequency, a reduction of up to a 30% in the aforementioned radius can be obtained, thereby opening new perspectives in the design of future ultra-thin electrospun fibers. Applications can be envisaged in the fields of nanophotonic components as well as for designing new and improved filtration materials.
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effects of orthogonal rotating electric fields on Electrospinning Process
arXiv: Computational Physics, 2016Co-Authors: Marco Lauricella, Federico Cipolletta, Giuseppe Pontrelli, Dario Pisignano, Sauro SucciAbstract:Electrospinning is a nanotechnology Process whereby an external electric field is used to accelerate and stretch a charged polymer jet, so as to produce fibers with nanoscale diameters. In quest of a further reduction in the cross section of electrified jets hence of a better control on the morphology of the resulting electrospun fibers, we explore the effects of an external rotating electric field orthogonal to the jet direction. Through extensive particle simulations, it is shown that by a proper tuning of the electric field amplitude and frequency, a reduction of up to a $30 \%$ in the aforementioned radius can be obtained, thereby opening new perspectives in the design of future ultra-thin electrospun fibres. Applications can be envisaged in the fields of nanophotonic components as well as for designing new and improved filtration materials.
Marco Lauricella - One of the best experts on this subject based on the ideXlab platform.
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effects of orthogonal rotating electric fields on Electrospinning Process
Physics of Fluids, 2017Co-Authors: Marco Lauricella, Federico Cipolletta, Giuseppe Pontrelli, Dario Pisignano, Sauro SucciAbstract:Electrospinning is a nanotechnology Process whereby an external electric field is used to accelerate and stretch a charged polymer jet, so as to produce fibers with nanoscale diameters. In quest of a further reduction in the cross section of electrified jets hence of a better control on the morphology of the resulting electrospun fibers, we explore the effects of an external rotating electric field orthogonal to the jet direction. Through intensive particle simulations, it is shown that by a proper tuning of the electric field amplitude and frequency, a reduction of up to a 30% in the aforementioned radius can be obtained, thereby opening new perspectives in the design of future ultra-thin electrospun fibers. Applications can be envisaged in the fields of nanophotonic components as well as for designing new and improved filtration materials.
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effects of orthogonal rotating electric fields on Electrospinning Process
arXiv: Computational Physics, 2016Co-Authors: Marco Lauricella, Federico Cipolletta, Giuseppe Pontrelli, Dario Pisignano, Sauro SucciAbstract:Electrospinning is a nanotechnology Process whereby an external electric field is used to accelerate and stretch a charged polymer jet, so as to produce fibers with nanoscale diameters. In quest of a further reduction in the cross section of electrified jets hence of a better control on the morphology of the resulting electrospun fibers, we explore the effects of an external rotating electric field orthogonal to the jet direction. Through extensive particle simulations, it is shown that by a proper tuning of the electric field amplitude and frequency, a reduction of up to a $30 \%$ in the aforementioned radius can be obtained, thereby opening new perspectives in the design of future ultra-thin electrospun fibres. Applications can be envisaged in the fields of nanophotonic components as well as for designing new and improved filtration materials.
Kenneth White - One of the best experts on this subject based on the ideXlab platform.
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structure tunable janus fibers fabricated using spinnerets with varying port angles
Chemical Communications, 2015Co-Authors: Gaoyun Chen, Deng-guang Yu, Nicholas P Chatterton, Ying Xu, Daofang Zhang, Kenneth WhiteAbstract:The preparation of Janus fibers using a new side-by-side Electrospinning Process is reported. By manipulating the angle between the two ports of the spinneret emitting the working fluids, Janus nanofibers with tunable structures in terms of width, interfacial area and also volume of each side can be easily fabricated.
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sustained release multiple component cellulose acetate nanofibers fabricated using a modified coaxial Electrospinning Process
Journal of Materials Science, 2014Co-Authors: Kenneth White, Deng-guang Yu, Xuyao ZhaoAbstract:Two drawbacks of the traditional Electrospinning Process when used for producing nanofibers for drug release are that clogging of the spinneret is often experienced, and the fibers produced often exhibit a tailing-off of drug release over sustained periods. The present study investigates the preparation of ferulic acid (FA) sustained-release cellulose acetate (CA) nanofibers, in which a third component, polyvinylpyrrolidone (PVP), was included into the nanocomposites for an improved sustained drug release profile. A modified coaxial Electrospinning Process, in which only organic solvent N,N-dimethylacetamide was used as a sheath fluid, was exploited for a smooth and continuous fabrication of multiple-component nanofibers. Under an applied voltage of 16 kV and an optimized sheath-to-core flow rate ratio of 0.11, three types of FA/PVP/CA composite nanofibers (with varied of PVP content) were generated. These nanofibers had higher quality in terms of size and distribution of nanofiber diameter, as indicated by FESEM images. Analysis of double- and triple-component nanofibers by XRD, DSC, and ATR-FTIR confirmed the compatibility of components producing homogenous fibers in both cases, but the triple-component nanofibers exhibited better release profiles over sustained periods than the double-component nanofibers in terms of release completeness, reduced tailing-off, and adjustable release rates. The modified coaxial Process and the resulting multiple-component nanocomposites should provide a new way for developing novel drug sustained materials and drug delivery systems.
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a modified coaxial Electrospinning for preparing fibers from a high concentration polymer solution
Express Polymer Letters, 2011Co-Authors: Christopher Branfordwhite, Kenneth White, Nicholas P Chatterton, L M Zhu, L Y Huang, B WangAbstract:A new Process technology modified from conventional coaxial Electrospinning Process has been developed to prepare polymer fibers from a high concentration solution. This Process involves a pure solvent concentrically surrounding polymer fluid in the spinneret. The concentric spinneret was constructed simply by inserting a metal needle through a high elastic silica gel tube. Two syringe pumps were used to drive the core polymer solution and the sheath solvent. Using polyvinylpyrrolidone (PVP) as the polymer model, which normally has an electrospinnable concentration of 10% w/v in ethanol, it was possible to electrospin 35% w/v of PVP in the same solvent, when pure N, N-dimethylacetamide (DMAc) was used as sheath fluid. The resultant fibers have a smooth surface morphology and good structural uniformity. The diameter of the fibers was 2.0±0.25 µm when the DMAc-to-polymer-solution flow rate ratio was set as 0.1. The Process technology reported here opens a new window to tune the polymer fibers obtained by the Electrospinning, and is useful for improving productivity of the Electrospinning Process.
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improving polymer nanofiber quality using a modified co axial Electrospinning Process
Macromolecular Rapid Communications, 2011Co-Authors: Christopher Branfordwhite, S Annie W Bligh, Kenneth White, Nicholas P Chatterton, Limin ZhuAbstract:Based on a modified coaxial Electrospinning Process and suitable selection of solvent mixtures as sheath fluid, a new strategy is presented for systematically improving polymer nanofiber quality. A concentric spinneret with an indented inner capillary is designed for the modified coaxial Electrospinning. With a solution of 12% w/v PVP K60 in ethanol as the core Electrospinning fluid, six solvents are used as sheath fluids to investigate the impact of solvent properties on the resultant PVP nanofiber quality. The PVP nanofiber quality is closely related to solvent physical-chemical properties. High quality PVP nanofibers of average diameter 130 ±10 nm with homogeneous structures and smooth surfaces are created using a solvent mixture of acetone, ethanol and DMAc in the ratio of 3:1:1(v/v/v).
Deng-guang Yu - One of the best experts on this subject based on the ideXlab platform.
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structure tunable janus fibers fabricated using spinnerets with varying port angles
Chemical Communications, 2015Co-Authors: Gaoyun Chen, Deng-guang Yu, Nicholas P Chatterton, Ying Xu, Daofang Zhang, Kenneth WhiteAbstract:The preparation of Janus fibers using a new side-by-side Electrospinning Process is reported. By manipulating the angle between the two ports of the spinneret emitting the working fluids, Janus nanofibers with tunable structures in terms of width, interfacial area and also volume of each side can be easily fabricated.
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Tunable biphasic drug release from ethyl cellulose nanofibers fabricated using a modified coaxial Electrospinning Process
Nanoscale Research Letters, 2014Co-Authors: Chen Li, Zhuan-hua Wang, Deng-guang Yu, Gareth WilliamsAbstract:This manuscript reports a new type of drug-loaded core-shell nanofibers that provide tunable biphasic release of quercetin. The nanofibers were fabricated using a modified coaxial Electrospinning Process, in which a polyvinyl chloride (PVC)-coated concentric spinneret was employed. Poly (vinyl pyrrolidone) (PVP) and ethyl cellulose (EC) were used as the polymer matrices to form the shell and core parts of the nanofibers, respectively. Scanning and transmission electron microscopy demonstrated that the nanofibers had linear morphologies and core-shell structures. The quercetin was found to be present in the nanofibers in the amorphous physical status, on the basis of X-ray diffraction results. In vitro release profiles showed that the PVP shell very rapidly freed its drug cargo into the solution, while the EC core provided the succedent sustained release. Variation of the drug loading permitted the release profiles to be tuned.
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sustained release multiple component cellulose acetate nanofibers fabricated using a modified coaxial Electrospinning Process
Journal of Materials Science, 2014Co-Authors: Kenneth White, Deng-guang Yu, Xuyao ZhaoAbstract:Two drawbacks of the traditional Electrospinning Process when used for producing nanofibers for drug release are that clogging of the spinneret is often experienced, and the fibers produced often exhibit a tailing-off of drug release over sustained periods. The present study investigates the preparation of ferulic acid (FA) sustained-release cellulose acetate (CA) nanofibers, in which a third component, polyvinylpyrrolidone (PVP), was included into the nanocomposites for an improved sustained drug release profile. A modified coaxial Electrospinning Process, in which only organic solvent N,N-dimethylacetamide was used as a sheath fluid, was exploited for a smooth and continuous fabrication of multiple-component nanofibers. Under an applied voltage of 16 kV and an optimized sheath-to-core flow rate ratio of 0.11, three types of FA/PVP/CA composite nanofibers (with varied of PVP content) were generated. These nanofibers had higher quality in terms of size and distribution of nanofiber diameter, as indicated by FESEM images. Analysis of double- and triple-component nanofibers by XRD, DSC, and ATR-FTIR confirmed the compatibility of components producing homogenous fibers in both cases, but the triple-component nanofibers exhibited better release profiles over sustained periods than the double-component nanofibers in terms of release completeness, reduced tailing-off, and adjustable release rates. The modified coaxial Process and the resulting multiple-component nanocomposites should provide a new way for developing novel drug sustained materials and drug delivery systems.
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Polyacrylonitrile nanofibers coated with silver nanoparticles using a modified coaxial Electrospinning Process
International Journal of Nanomedicine, 2012Co-Authors: Deng-guang Yu, Ying Li, Nichoals P Chatterton, Jie Zhou, Jing Huang, Xia WangAbstract:BACKGROUND: The objective of this investigation was to develop a new class of antibacterial material in the form of nanofibers coated with silver nanoparticles (AgNPs) using a modified coaxial Electrospinning approach. Through manipulation of the distribution on the surface of nanofibers, the antibacterial effect of Ag can be improved substantially.\n\nMETHODS: Using polyacrylonitrile (PAN) as the filament-forming polymer matrix, an electrospinnable PAN solution was prepared as the core fluid. A silver nitrate (AgNO₃) solution was exploited as sheath fluid to carry out the modified coaxial Electrospinning Process under varied sheath-to-core flow rate ratios.\n\nRESULTS: Scanning electron microscopy and transmission electron microscopy demonstrated that the sheath AgNO₃ solution can take a role in reducing the nanofibers' diameters significantly, a sheath-to-core flow rate ratio of 0.1 and 0.2 resulting in PAN nanofibers with diameters of 380 ± 110 nm and 230 ± 70 nm respectively. AgNPs are well distributed on the surface of PAN nanofibers. The antibacterial experiments demonstrated that these nanofibers show strong antimicrobial activities against Bacillus subtilis Wb800, and Escherichia coli dh5α.\n\nCONCLUSION: Coaxial Electrospinning with AgNO₃ solution as sheath fluid not only facilitates the Electrospinning Process, providing nanofibers with reduced diameters, but also allows functionalization of the nanofibers through coating with functional ingredients, effectively ensuring that the active antibacterial component is on the surface of the material, which leads to enhanced activity. We report an example of the systematic design, preparation, and application of a novel type of antibacterial material coated with AgNPs via a modified coaxial Electrospinning methodology.