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Carbon Nanotubes - DOAJ

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Last Updated: 04 October 2022

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

Thermal transport in the nanofluid over a curved Riga surface is important and widely used in many industries as well as engineering. The study is therefore conducted to determine the thermal transport rate in H2O made of nanomaterials, namely, carbon nanotubes. A thermal conductivity correlation based on the length and radius of CNTs is added to the energy equation in order to raise the thermal conductance. The nanofluids' thermal conductivity rises thanks to the high volume fraction factor, which is a key factor in thermal transport. In addition, the local thermal quality improves linearly against M.

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


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

The effects of CNTs on the nonlinear transient responses of doubly curved shells with different cutout sizes and curvatures are investigated in the first application. The new findings published in this article highlight the differences between CNT weight ratios and crack sizes in CNTFPC-reinforced concrete buildings' CNT weight ratios and crack sizes.

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

The damage self-sensing and strain testing of glass-reinforced epoxy composites impregnated with graphene nanoplatelets and multiwalled carbon nanotubes was investigated. With nanofiller content, 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. Improve mechanical and electrical results are obtained with 3 wt% nanofiller loadings for GNP and MWCNT. u2013electrical results are obtained by the 3 wt% nanofiller loading for GNP and MWCNT. The dispersion of GNP and MWCNT nanofillers in the composites was discovered by field emission scanning electron microscopy.

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


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

The first-order loss factor of composite beam specimens with 0. 025 wt% CNT content increases by 128. 9% over a period of pure epoxy content, according to the report. The maximum value of nanocomposite beams with GNP reinforcement is 62% higher than that of 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 higher specific capacity, improved rate stability, and improved cycling stability when used as Li-ion anodes. Besides, CNT@HBP-2 maintains 268 mA h g'u22121 in the 500th cycles at 0. 1 A gu22121, 617 mA g/u22121, and 617 mA h gu22121, respectively, outperforming CNT@HBP-1. The incorporation of additional redox-active triazine units into HBP-2 is responsible for CNT@HBP-2's improved electrochemical results relative to CNT@HBP-1.

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


Graphene oxide/carbon nanotubes nanocoating for improved scale inhibitor adsorption ability onto rock formation

Scale deposition in the formation and production tubing can restrict the flow of hydrocarbon and obstructions in the testing and operation of downhole equipment. Scale inhibition squeeze therapy is one of the most common methods of scale prevention. Experimental experiments were conducted to see if graphene oxide and carbon nanotubes would enhance the adsorption of conventional scale inhibitor, ethylenediaminetetraacetic acid, on rock formation in a process known as nano-carbon enhanced squeeze therapy. This process involves treating the rock surface in the near-wellbore area with nanomaterials that increase the scale inhibitor's adsorption capacity. On rock sample treated with nanomaterials treated with a maximum adsorption of 180 mg/g compared to 51 mg/g on rock sample treated without nanomaterials treatment, the NCEST technique was found to dramatically raise the adsorption of EDTA on rock sample treated with nanomaterials with a maximum adsorption of 180 mg/g relative to a rock sample treated with nanomaterials treatment.

Source link: https://doi.org/10.1007/s13202-019-0689-7


Utilization of carbon nanotubes and steel fibers to improve the mechanical properties of concrete pavement

Abstract Background: Rigid pavements have risen in popularity in recent years, as these pavements require less maintenance and repair than other types. In the last few years, a lot of attention has been paid to nanomaterial applications to improve the mechanical quality of building materials, which can also be used for rigid pavement constructions. This review investigates the effects of adding carbon nanotubes and steel fibers to concrete mixtures. A series of experiments on concrete mixes with various weight percentages of CNTs were added to the mixtures to determine the best cost and amount of CNTs to add to a concrete mixture. Concrete's most common carbon nanotube content is 0. 05 percent, according to the authors. Conclusion This research has shown that mixing SFs with CNTs improves the concrete mortar's mechanical properties, resulting in a more robust mortar that can withstand more loads than the conventional one.

Source link: https://doi.org/10.1186/s43088-022-00300-5


Determining the optimum concentration of multiwalled carbon nanotubes as filtrate loss additive in field-applicable mud systems

Abstract Abstract: Several materials have over time been tested in order to combat fluid loss in muds, where the effects of high downhole temperatures have pronounced effects on conventional fluid loss additives. However, the success of high amounts of multiwall carbon nanotubes as fluid loss control additives in field-applicable mud systems was put to the test in this study. The results show that low MWCNT mud filter loss volumes resulted in high filter loss volumes, but an increase to 2. 5 ppb reduced the margin of the filter loss volume by 52% from the baseline value and a 50% decrease in the first case.

Source link: https://doi.org/10.1007/s13202-019-0740-8


MgO-incorporated carbon nanotubes-reinforced Mg-based composites to improve mechanical, corrosion, and biological properties targeting biomedical applications

Magne oxide nanoparticles are embedded on carbon nanotubes to strengthen Mgu20131Mn alloy by semi-powder metallurgy, followed by hot extrusion with the intention of improving the mechanical and biological properties of Mg-based alloys. Mg alloy grain size reduced by 51% with the incorporation of CNTs, resulting in a minimum decrease in grain size of 61%, with even more grain size reduction observed when MgO integrated CNTs composites added. In addition, MgO bounded CNTs fillers decelerated the degradation rate of Mg-based alloys, although MgO's introduction of CNTs to Mg alloy had less effect.

Source link: https://doi.org/10.1016/j.jmrt.2022.06.154


Electromagnetic waves-induced hydrophobic multiwalled carbon nanotubes for enhanced oil recovery

In this paper, multiwalled carbon nanotubes were used to investigate the effect of the nanofluidu2019s flow rate on the oil recovery phase in an elevated oil recovery stage. To find out the effect of EM waves on recovery rates, a comparative research was conducted under the ideal conditions. By 24. 5% ROIP, the recovered oil in the EOR stage could be boosted by EM waves, which could lead to a 24. 5% ROIP increase.

Source link: https://doi.org/10.1007/s13202-019-0653-6

* 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