Synthesis and characterization of cobalt chloride/poly(ethylene oxide) electrospun hybrid nanofibers

Abiona, Adurafimihan A.; Ajao, J. A.; Chigome, Samuel; Kana, J. B. Kana; Osinkolu, G.A.; Mâaza, M.

doi:10.1007/s10971-010-2239-0

Cited by 16 publications

(12 citation statements)

References 16 publications

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“…Obviously, two processes are provoked by the degradation of PP, one is the scission of the polymer chains and the other is the build‐up of carbonyl groups and other additional chemical groups 33 . Thus, polymer degradation can cause crystalline domains to degrade as well as to form 34,35 . Here, no significant change in the melting enthalpy and the resulting crystallinity was measurable after the first irradiation despite detected polymer chain scission via previously reported analysis.…”

Section: Resultsmentioning

confidence: 58%

“…These can lead to a slight increase in polarity, which results in an increase in the nucleation rate 33 . With further processing cycles, crystalline domain degradation occurs with a higher probability than their build‐up 34,35 . This results in a global trend of decreasing melting enthalpy, crystallinity, and melting temperature with cycle number.…”

Section: Resultsmentioning

confidence: 99%

“…Afterwards, the increase in YI was only slightly measurable. The melting enthalpy was reduced due to chain degradation, however at lower processing cycles this effect was superimposed by enhanced crystal structure formation due to shorter chains 34,35 …”

Section: Discussionmentioning

confidence: 99%

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Stability assessment of a commercial polypropylene copolymer and Irgafos 168 under repeated injection molding and γ‐irradiation cycles

Zerhusen,

Herrmann,

Susoff

et al. 2023

J of Applied Polymer Sci

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Despite the increasing importance of recycling, the medical sector is hardy engaged at this time due to regulatory issues. The aim of this study was to evaluate the influence of γ‐radiation sterilization (48–52 kGy) on the repetitive injection molding of a polypropylene copolymer for medical applications. For this purpose, the material was analyzed after injection molding and irradiation. To evaluate the irradiation and reprocessing influence, optical, rheological, and mechanical properties were investigated in addition to chromatography. The latter comprised the quantitative determination of Irgafos 168 and the qualitative comparison of volatile degradation products formed, including the radiolysis product 1,3‐di‐tert‐butylbenzene. The influence of irradiation on the content of Irgafos 168, volatile organic compounds, and 1,3‐di‐tert‐butylbenzene was greatest after the first irradiation, with a decrease of Irgafos 168 content by 40%. The yellowness index and melting enthalpy were influenced by irradiation and processing, but showed no direct relationship to the individual process steps. The zero viscosity correlated directly with gas chromatography–mass spectrometry results and decreased by 80% after the first irradiation. In addition, the elongation at break was reduced by 95% after the second irradiation. The influence of irradiation on the studied characteristics was high, whereas the influence of repetitive processing did not show any measurable differences

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

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Stability assessment of a commercial polypropylene copolymer and Irgafos 168 under repeated injection molding and γ‐irradiation cycles

Zerhusen,

Herrmann,

Susoff

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The modified setup consisted of a cylindrical magnet placed vertically in front of a grounded aluminum foil. The team then used silicon wafer substrates placed on top, sides, and front of the magnet to collect the nanofibers 38 . This setup is a pioneering method that combines multiple techniques for achieving high level of fiber alignment; nonetheless, quite complex in nature.…”

Section: Background Of the Studymentioning

confidence: 99%

“…This setup is a pioneering method that combines multiple techniques for achieving high level of fiber alignment; nonetheless, quite complex in nature. In general, when using magnetic field-assisted electrospinning with two parallel magnets, the deposition area becomes somewhat limited, but this limitation does not apply to setups with one magnet as a direct collector or other collector types 29 , 38 , 39 .…”

Section: Background Of the Studymentioning

confidence: 99%

An origami-based technique for simple, effective and inexpensive fabrication of highly aligned far-field electrospun fibers

Hosseinian

Jimenez-Moreno

Sher

et al. 2023

Sci Rep

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Fabrication of highly aligned fibers by far-field electrospinning is a challenging task to accomplish. Multiple studies present advances in the alignment of electrospun fibers which involve modification of the conventional electrospinning setup with complex additions, multi-phased fabrication, and expensive components. This study presents a new collector design with an origami structure to produce highly-aligned far-field electrospun fibers. The origami collector mounts on the rotating drum and can be easily attached and removed for each round of fiber fabrication. This simple, effective, and inexpensive technique yields high-quality ultra-aligned fibers while the setup remains intact for other fabrication types. The electrospun poly(ɛ-caprolactone) (PCL) fibers were assessed by scanning electron microscope (SEM), fiber diameter distribution, water contact angle (WCA), Fast Fourier Transform analysis (FFT), surface plot profile, and pixel intensity plots. We thoroughly explored the impact of influential parameters, including polymer concentration, injection rate, collector rotation speed, distance from the collector to the tip, and needle gauge number on fibers’ quality and alignment. Moreover, we employed machine learning algorithms to predict the outcomes and classify the high-quality fibers instead of low-quality productions.

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γ‐Ray Irradiation Significantly Enhances Capacitive Energy Storage Performance of Polymer Dielectric Films

Wang,

Bao,

Ding

et al. 2024

Advanced Materials

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Polymer dielectric capacitors are fundamental in advanced electronics and power grids but suffer from low energy density, hindering miniaturization of compact electrical systems. We show that high‐energy and strong penetrating γ‐irradiation significantly enhances capacitive energy storage performance of polymer dielectrics. γ‐irradiated biaxially oriented polypropylene (BOPP) films exhibit an extraordinarily high energy density of ∼10.4 J cm−3 at ∼968 MV m−1 with an efficiency of ∼97.3%. In particular, an energy density of ∼4.06 J cm−3 with an ultrahigh efficiency of ∼98% is reliably maintained through 20,000 charge‐discharge cycles under 600 MV m−1. At 125 °C, the γ‐irradiated BOPP film still delivers a high discharged energy density of ∼5.88 J cm−3 with an efficiency of ∼90% at ∼770 MV m−1. Substantial improvements are also achieved for γ‐irradiated cycloolefin copolymers at a high temperature of 150 °C, verifying the strategy generalizability. Experimental and theoretical analyses reveal that the excellent performance should be related to the γ‐irradiation induced polar functional groups with high electron affinity in the molecular chain, which offer deep energy traps to impede charge transport. This work provides a simple and generally applicable strategy for developing high‐performance polymer dielectrics.This article is protected by copyright. All rights reserved

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Synthesis and characterization of cobalt chloride/poly(ethylene oxide) electrospun hybrid nanofibers

Cited by 16 publications

References 16 publications

Stability assessment of a commercial polypropylene copolymer and Irgafos 168 under repeated injection molding and γ‐irradiation cycles

Stability assessment of a commercial polypropylene copolymer and Irgafos 168 under repeated injection molding and γ‐irradiation cycles

An origami-based technique for simple, effective and inexpensive fabrication of highly aligned far-field electrospun fibers

γ‐Ray Irradiation Significantly Enhances Capacitive Energy Storage Performance of Polymer Dielectric Films

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