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Carbon Nanofiber - DOAJ

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Last Updated: 15 January 2023

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Development of Kovacs model for electrical conductivity of carbon nanofiber–polymer systems

Abstract This paper presents a schematic representation of the electrical conductivity of polymer carbon nanofiber nanocomposites, which includes two steps. In the first step, Kovacs model is designed to model the CNF, interphase, and tunneling zones as distinct zones within the framework. While several earlier models were developed to predict PCNF's electrical conductivity, the development of a Kovacs model aids in a better understanding of the effect of key factors on the nanocomposite conductivity. The lowest conductivity of PCNF has been 0. 019 S/m at the lowest ranges of polymer tunnel resistance and tunneling distance, whereas the lowest percentages of these factors could not cause a conductive sample. Additionally, a high CNF volume fraction, poor waviness, long and thin CNF, low u201d, thick interphase, high CNF conduction, a significant percentage of percolated CNFs, low percolation onset, and high interphase conductivity all contribute to an excellent conductivity in PCNF.

Source link: https://doi.org/10.1038/s41598-022-26139-5


Comparative study on the static and dynamic mechanical properties and micro-mechanism of carbon fiber and carbon nanofiber reinforced concrete

Concrete reinforced concrete and carbon nanofiber reinforced concrete were used to determine the effects of carbon fiber and carbon nanofiber on concrete's static and dynamic mechanical characteristics. Both carbon fiber and carbon nanofiber were shown to have improved concrete's mechanical properties and refine the pore size distribution of concrete. The energy consumption results of CFRC were higher, according to the dynamic compression mechanical properties, although the strength results of CNFRC was better. Carbon fiber provided a more apparent u201c crack resistance effect under load, while carbon nanofiber had a more noticeable u201d u201d'u201d's. Carbon nanofiber had a higher effect on concrete's pore structure than carbon fiber, according to a carbon nanofiber.

Source link: https://doi.org/10.1016/j.cscm.2023.e01827


Electroactive Hydroxyapatite/Carbon Nanofiber Scaffolds for Osteogenic Differentiation of Human Adipose-Derived Stem Cells

Traditional bone defect therapies are limited by an inadequate supply of autologous bone, the immune rejection of allogeneic bone grafts, and high medical expenses. The results of osteogenesis in human adipose-derived stem cells cultured on HAp/CNF scaffolds are shown to have promoted osteogenesis of h-ADSCs in the absence of an osteogenic factor. The results of this research reveal that electroactive carbon materials with a fibrous structure can aid in the osteogenic differentiation of h-ADSCs, revealing a new strategy for the preparation and application of carbon-based materials in bone tissue engineering.

Source link: https://doi.org/10.3390/ijms24010530


Enhanced superhydrophobicity of electrospun carbon nanofiber membranes by hydrothermal growth of ZnO nanorods for oil–water separation

An extremely advisable option is to develop electrospun nanofiber membranes with the specific wettability properties for effectively distinguishing oilu2013water mixtures. A superhydrophobic electrospinning carbon nanofiber membrane was successfully prepared by electrospinning and in-situ growth of ZnO, as well as subsequent fluorination reaction with 1H, 2H, 2H. When ZnO's growth period is 3 h, the improved F/ZnO/CNF-3 membrane has an excellent water contact angle and a high water separation efficiencies, which makes for a fruitful wateru2013water separation rate.

Source link: https://doi.org/10.1016/j.arabjc.2022.104523


Cobalt valence modulating in CoOx incorporated carbon nanofiber for enhanced glucose electrooxidation

The pyrolyzed fibers' cobalt valence modulating could be achieved by limiting the incorporation ratio of cobalt acetate in precursors or the oxidation temperature. The presence of CoO in CoOx@CNF will increase the number of active sites for glucose electrooxidation, thereby increasing the electrocatalytic efficiencies by a substantial margin, according to electrocatalytic results. As a result, the glucose fuel cell made with CoOx@CNF anode, which includes both CoO and Co3O4, produced a maximum power density of 270 bcW cmu22122122, which is higher than that of other reported Co3O4-based GFCs.

Source link: https://doi.org/10.1016/j.matre.2022.100091


Centrifugally Spun PVA/PVP Based B, N, F Doped Carbon Nanofiber Electrodes for Sodium Ion Batteries

Carbon nanofibers have been used in many fields, including energy storage, electromagnetic shielding, composites, sensors, and tissue engineering, due to their high electrical conductivity, large surface area, low density, high thermal stability, and chemical stability. Given the environmental implications of petroleum-based polymers, it is imperative to produce carbon nanofibers from environmentally friendly materials using fast and safe methods. PVA/PVP nanofibers were produced by centrifugal spinning, and the effects of PVP-blend nanofibers' morphology and thermal characteristics of PVA/PVP nanofibers were investigated using SEM and DSC analyses.

Source link: https://doi.org/10.3390/polym14245541


Dielectric Spectroscopy of Melt-Mixed Polypropylene and Pyrolytically Stripped Carbon Nanofiber Composites

PP/CNF composite composites improved only marginally as the incorporation of CNFs was increased, with a maximum of 10 m/u22121 for PP/CNF 5 wt. In addition, the Coleu2013Cole model was used to investigate the effects of CNF concentrations on the dielectric relaxation of PP/CNF composites, from which it was found that the incorporation of CNFs increases their dielectric strength and relaxation times. The research, which has been published here, aims to provide more insight into the improved dielectric properties found in low-conducting polymer composites containing CNFs.

Source link: https://doi.org/10.3390/jcs6120368


Room-Temperature NO 2 Gas Sensors Based on Granulated Carbon Nanofiber Material

The granulated material consisting of intertwined carbon nanofibers was synthesized by CH 4's decomposition of Ni/Al 2 O 3 catalyst in a vibro-fluidized bed reactor. In a dynamic flow-through setup from 1 to 500 ppm, an investigation of the gas sensors against NO 2 at room temperature was carried out. The sensor gas sensor was also used to compare NH 3 and CH 4. When increasing the relative humidity, it was discovered that sensor response to NO2 decreased.

Source link: https://doi.org/10.3390/chemosensors10120525


Thermoelectric Properties of N-Type Poly (Ether Ether Ketone)/Carbon Nanofiber Melt-Processed Composites

In this study, the thermoelectric properties of melt-processed poly composites made with ten percent carbon nanofibers are investigated, from 30 °C to 100 °C. The PEEK/CNF composites have an electrical conductivity of 27 S m / u22121 and a Seebeck coefficient of u22126. 1 u22121, which means that their majority charge carriers are electrons, at 30 u00b0C. In comparison to the u03c3 of as-received CNFs, the affective temperature effect of a thermally activated hopping mechanism through a random network of potential wells is negative, according to the 3D variable-range hopping model. In addition, their nonlinear S exhibits the same pattern observed before for polypropylene composites melt-processed with similar CNFs at the same time of temperatures.

Source link: https://doi.org/10.3390/polym14224803


The Acute and Short-Term Inhalation of Carbon Nanofiber in Sprague-Dawley Rats

Since there are so few related studies, the inhalation toxicity of carbon nanofibers is not well understood. Using Sprague-Dawley rats, an acute inhalation study and short-term inhalation experiment were also conducted. The rats were grouped and exposed to a fresh air filter, moderate, or high CNF concentrations for 6 h or more, with sacrificed at 14 days. The rats were grouped and exposed to a fresh air control, moderate, or high CNF levels for 6 h/day for 5 days, and sacrificed at 1, 3, and 21 days post-exposure for the short-term inhalation study. The CNF LC 50 was also higher than 25 mg/m 3. In addition, the bronchoalveolar cell difference and BAL inflammatory markers indicated no CNF-relevant changes, despite showing no CNF-exposure-related changes.

Source link: https://doi.org/10.3390/biom12101351

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions