Some approximate buckling solutions of triple-walled carbon nanotube

Senthilkumar, V.

doi:10.15625/0866-7136/17054

Cited by 2 publications

(3 citation statements)

References 29 publications

(38 reference statements)

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“…The SEM images of the synthesized MWCTS are shown in Figure 2a The distribution of the MWCNTs shown in Figure 2e,f has the character of a localized concentration with pronounced areas of unfilled polymer-with a level size of several micrometers, which is associated with the effect of the agglomeration of MWCNTs. In several reports [40,41], studies have been conducted related to the possibility of eliminating the agglomeration of MWCNTs in polymers. MWCNTs tend to form agglomerates and bundles in both liquid and solid media due to the high electron delocalization caused by the van der Waals interactions between the nanotubes [45,46].…”

Section: Structure Of Elastomers Modified With Carbon Nanotubes and M...mentioning

confidence: 99%

“…When the inner wall itself is destroyed, a significant drop in current is observed, which proves that each wall is conductive and therefore affects the overall electrical conductivity of the carbon nanotube. At the same time, the degradation of some CNTs occurs not only in the center but also on the marginal side of the CNT [ 40 ]. It should be taken into account that the degradation of CNTs is associated with oxidative processes during the flow of electric current, whereas vacuum CNTs withstand higher current densities and reach maximum current-carrying capacity [ 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

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Properties of Organosilicon Elastomers Modified with Multilayer Carbon Nanotubes and Metallic (Cu or Ni) Microparticles

Shchegolkov,

Zemtsova

et al. 2024

Polymers

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The structural and electro-thermophysical characteristics of organosilicon elastomers modified with multilayer carbon nanotubes (MWCNTs) synthesized on Co-Mo/Al2O3-MgO and metallic (Cu or Ni) microparticles have been studied. The structures were analyzed with scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and energy-dispersive X-ray spectroscopy (EDX). The main focus of this study was the influence of metallic dispersed fillers on the resistance of a modified elastomer with Cu and Ni to the degradation of electrophysical parameters under the action of applied electrical voltage. The distribution of the temperature field on the surface of a modified polymer composite with metallic micro-dimensional structures has been recorded. The collected data demonstrate the possibility of controlling the degradation caused by electrical voltage. It has been found that repeated on/off turns of the elastomer with an MWCNTs on 50 and 100 cycles leads to a deterioration in the properties of the conductive elastomer from the available power of 1.1 kW/m2 (−40 °C) and, as a consequence, a decrease in the power to 0.3 kW/m2 (−40 °C) after 100 on/off cycles. At the same time, the Ni additive allows increasing the power by 1.4 kW/m2 (−40 °C) and reducing the intensity of the degradation of the conductive structures (after 100 on/off cycles up to 1.2 kW/m2 (−40 °C). When Ni is replaced by Cu, the power of the modified composite in the heating mode increases to 1.6 kW/m2 (−40 °C) and, at the same time, the degradation of the conductive structures in the composite decreases in the mode of cyclic offensives (50 and 100 cycles) (1.5 kW/m2 (−40 °C)). It was found that the best result in terms of heat removal is typical for an elastomer sample with an MWCNTs and Cu (temperature reaches 93.9 °C), which indicates an intensification of the heat removal from the most overheated places of the composite structure. At the same time, the maximum temperature for the Ni additives reaches 86.7 °C. A sample without the addition of a micro-sized metal is characterized by the local unevenness of the temperature field distribution, which causes undesirable internal overheating and destruction of the current-conducting structures based on the MWCNTs. The maximum temperature at the same time reaches a value of 49.8 °C. The conducted studies of the distribution of the micro-sizes of Ni and Cu show that Cu, due to its larger particles, improves internal heat exchange and intensifies heat release to the surface of the heater sample, which improves the temperature regime of the MWCNTs and, accordingly, increases resistance to electrophysical degradation.

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Section: Structure Of Elastomers Modified With Carbon Nanotubes and M...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Properties of Organosilicon Elastomers Modified with Multilayer Carbon Nanotubes and Metallic (Cu or Ni) Microparticles

Shchegolkov,

Zemtsova

et al. 2024

Polymers

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show abstract

“…The flow of current through the CNT can cause obvious destruction in the structure of the CNT. The mechanism of CNT destruction under the action of an electric voltage (potential difference) (a high current load causes local thinning of the nanotube in the case of MWCNT structures) is presented in [ 30 ]. The mechanism of destruction of SWCNT can be explained as follows: oxidation due to Joule heating occurring at the center of the line.…”

Section: Introductionmentioning

confidence: 99%

Changes in the Electrophysical Parameters of Nanomodified Elastomers Caused by Electric Current’s Passage

Shchegolkov

Zemtsova

et al. 2023

Polymers

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The development of reliable and effective functional materials that can be used in various technological fields and environmental conditions is one of the goals of modern nanotechnology. Heating elements’ manufacturing requires understanding the laws of heat transfer under conditions of different supply voltages, as this expands the possibilities of such materials’ application. Elastomers based on silicon-organic compounds and polyurethane modified with multi-walled carbon nanotubes (MWCNTs) were studied at various concentrations of Ni/MgO or Co-Mo/MgO and voltages (220, 250, and 300 V). It was found that an increase in voltage from 220 to 300 V leads to an initial increase in specific power on one-third followed by a subsequent decrease in a specific power when switched on again to 220 V (for −40 °C) of up to ~44%. In turn, for a polyurethane matrix, an increase in voltage to 300 V leads to an initial peak power value of ~15% and a decrease in power when switched on again by 220 V (for −40 °C) to ~36% (Ni/MgO -MWCNT). The conducted studies have shown that the use of a polyurethane matrix reduces power degradation (associated with voltage surges above 220 V) by 2.59% for Ni/MgO–based MWCNT and by 10.42% for Co-Mo/MgO. This is due to the better heat resistance of polyurethane and the structural features of the polymer and the MWCNT. The current studies allow us to take the next step in the development of functional materials for electric heating and demonstrate the safety of using heaters at a higher voltage of up to 300 V, which does not lead to their ignition, but only causes changes in electrophysical parameters.

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Some approximate buckling solutions of triple-walled carbon nanotube

Cited by 2 publications

References 29 publications

Properties of Organosilicon Elastomers Modified with Multilayer Carbon Nanotubes and Metallic (Cu or Ni) Microparticles

Properties of Organosilicon Elastomers Modified with Multilayer Carbon Nanotubes and Metallic (Cu or Ni) Microparticles

Changes in the Electrophysical Parameters of Nanomodified Elastomers Caused by Electric Current’s Passage

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