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Carbon Nanotubes - Crossref

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Last Updated: 04 September 2022

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Numerical investigation of heat transfer in the nanofluids under the impact of length and radius of carbon nanotubes

Abstract: Thermal transport in the nanofluid over a curved Riga surface is both important and widely used in many industries as well as engineering. Because, the investigation is being carried out to determine the thermal transport rate in H 2 O made of nanomaterial, namely carbon nanotubes. A thermal conductivity correlation based on the length and radius of CNTs is introduced in the energy equation to improve the thermal conductance. Thermal conductivity of the nanofluids rises due to the high volume fraction factor, which plays a significant role in thermal transport.

Source link: https://doi.org/10.1515/phys-2022-0040


MODIFICATION OF CEMENT-CONCRETE MIXTURES WITH POLYMER ADDITIVES, STRUCTURED CARBON NANOTUBES

In modern materials science, the use of complex modifiers for cement-concrete mixtures and concretes is getting more popular. The paper discusses the effect of a polymer additive coated with carbon nanomaterial on the physical and mechanical characteristics of cement-concrete blends. The use of carbon nanomaterial significantly alters the structure of cement-concrete mixtures, according to IR spectroscopy and thermogravimetry. A denser reinforced microstructure is developed as a result of the fact that high-strength nanomaterial is the center of crystallization of cement stone formations, which greatly improves the strength characteristics of cement-concrete mixtures. It is found that in the presence of a complicated modifier, the crystal structure of calcium hydrosilicates is compacted, which results in improved cement-concrete mixtures' high physical and mechanical characteristics. In general, the additive has a water-reducing effect on all cement-concrete blends in this review. Water consumption has decreased by 5 wt.

Source link: https://doi.org/10.15407/polymerj.44.02.101


Dielectric properties of microcrystalline cellulose/multi-wall carbon nanotubes multi-scale reinforced EVA/VeoVa terpolymer

paracetate/vinyl ester of versatic acid terpolymer and its composites reinforced with microcrystalline cellulose and multi-wall carbon nanotubes were investigated by Dielectric analysis. The second one that appeared above the glass transition temperature was attributed to the u03b1 increase, which was due to the terpolymer's main glass transition. U03b1:u2019 relaxation, resulting from the movement of more repeat units compared to the u03b1 one, which resulted in higher temperatures and lower frequencies. The reinforcements' incorporation into the matrix gave rise to three additional dielectric phenomena originating either from microcrystalline cellulose or matrix/reinforcement interfaces. According to an appropriate equivalent circuit model, probing reinforcement/matrix interactions allowed verification of probe-matrix interactions at low temperatures by using the Havriliak-Negami model and those at high temperatures.

Source link: https://doi.org/10.1177/00219983221121866


A comparative experimental study on damping properties of epoxy nanocomposite beams reinforced with carbon nanotubes and graphene nanoplatelets

The first-order loss factor for composite beam specimens with 0. 025 wt% CNT content increases by 128. 9%, according to the study. The maximum value of nanocomposite beams with GNP reinforcement is 62% higher than that with CNTs, and it is 62% higher than those with CNTs.

Source link: https://doi.org/10.1515/ntrev-2022-0107


Core–shell heterostructured composites of carbon nanotubes and imine-linked hyperbranched polymers as metal-free Li-ion anodes

Both CNT@HBP-1 and CNT@HBP-2 exhibit greater specific capacity, enhanced rate stability, and increased cycling stability when used as Li-ion anodes. 1. 0 A g u22121 at 0. 05 A g 121 yeu22121 mA g u22121 mA h g u22121 r g ru22121 g u22121, a corresponding cNT@HBP-2 ye 22121 mA h g v u22121 mA g u22121, and 81 g h g a h t g t h g t g u22121 t g t g h g u22121 g t g u22121 t g u22121 g t g u22121 t u22121 mA g h t g t u22121, u22121 g 121 g 122121 g h f In addition, CNT@HBP-2 maintains 268 mA g o b g e u22121 over 100 cycles at 0. 1 A g 2. 2121, and 617 mA h g u22121 g u22121, outperforming CNT@HBP-1. The incorporation of additional redox-active triazine units into HBP-2 is attributable to CNT@HBP-2's improved electrochemical results relative to CNT@HBP-1.

Source link: https://doi.org/10.1515/ntrev-2022-0046


Nonlinear dynamic and crack behaviors of carbon nanotubes-reinforced composites with various geometries

Abstract This paper presented finite element dynamic simulations of carbon nanotubes/fiber/polymer composites of various geometries. The effects of CNTs on nonlinear transient responses of doubly curved shells of various cutout sizes and curvatures are investigated in the first application. The new results in this article demonstrate the correlations between CNT weight ratios and crack sizes in CNTFPC-reinforced concrete buildings.

Source link: https://doi.org/10.1515/ntrev-2022-0079


Damage self-sensing and strain monitoring of glass-reinforced epoxy composite impregnated with graphene nanoplatelet and multiwalled carbon nanotubes

Abstract: The damage that glass-reinforced epoxy composites impregnated with graphene nanoplatelets and multiwalled carbon nanotubes were investigated, as well as strain monitoring. With nanofiller material, the electrical conductivity of the GNP-glass and MWCNT-glass composites increased. From 0. 5 to 3 wt%, the composite's tensile and flexural strengths were enhanced with the addition of GNP and MWCNT nanofillers. The 3 wt% nanofiller loading for GNP and MWCNT results in improved mechanical and electrical results, according to the u2013 electrical engineer. The dispersion of GNP and MWCNT nanofillers in the composites was shown by field emission scanning electron microscopy.

Source link: https://doi.org/10.1515/ntrev-2022-0117


Promoted charge separation and specific surface area via interlacing of N-doped titanium dioxide nanotubes on carbon nitride nanosheets for photocatalytic degradation of Rhodamine B

Abstract: Titanium dioxide has been regarded as a promising catalyst due to its superior charge transport capabilities in photocatalytic degradation of organic pollutants and photocatalytic hydrogen generation. However, a major bottleneck in the introduction of TiO 2 photocatalysts is inefficient utilization of visible light and low adsorption properties. The Rhodamine B photocatalytic degradation rate in the N-TNT/g-CNN composites was the highest, u223c85%, under solar-light irradiation, which is two times higher than that of the N-TNT.

Source link: https://doi.org/10.1515/ntrev-2022-0085


Laccase-Catalyzed Reduction of Oxygen at Electrodes Modified by Carbon Nanotubes with Adsorbed Promazine or Acetosyringone

It's one of the issues with the use of enzymes as catalysts in biofuel cells is that good contact between the enzyme and the electrode surface is one of the enzyme's key issues. As biocathodes, Acetosyringone and promazine adsorbed on glassy carbon electrodes coated with multiwall carbon nanotubes and laccase were used as biocathodes. Compared to electrodes without mediators, excellent electrical interaction between the electrode surface and the laccase enzymatic active sites made it possible to increase the oxygen-reduction's catalytic current density by about 82%. Application of acetosyringone and promazine in the manufacture of biocathode also improved the current and effectiveness of the biochemistry ca. The devices, which were designed to measure lower oxygen levels in solution relative to the GCE modified with MWCNTs and laccase alone, exceeded the power that equaled approximately 2 mW/cm2 at 0. 8 V and open circuit potential of 1. 6 V.

Source link: https://doi.org/10.3390/catal8100414


Nanotubes: Carbon-Based Fibers and Bacterial Nano-Conduits Both Arousing a Global Interest and Conflicting Opinions

BNTs are characterized by the majority of experts as transparent intercellular bridges that link neighboring bacterial cell population living in close proximity. Despite recent conflicting results, most evidence suggests that bacteria exploit NTs to establish both antagonistic and cooperative intercellular exchanges of cytoplasmic molecules and nutrients. Among other things, it has been suggested that such molecular trade, as well as plasmids, help the emergence of new non-heritable phenotypes and characteristics in multicellular bacterial populations, including antibiotic resistance, which is also of utmost importance to global health. Here's an enthralling comparison between CNTs, which are chemically produced and widely used for improving human life, and BNTs biosynthetically manufactured by prokaryotes, whose functions are not yet fully established, but whose greater knowledge may help to better understand pathogenesis and combat resistance.

Source link: https://doi.org/10.3390/fib10090075

* 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