Thermal conductivity of an ultrathin carbon nanotube with an X-shaped junction

Thermally conductive polymer composites offer new possibilities for replacing metal parts in several applications, including power electronics, electric motors and generators, heat exchangers etc., thanks to the polymer advantages such as light weight, corrosion resistance and ease of processing. Current interest to improve the thermal conductivity of polymers is focused on the selective addition of nanofillers with high thermal conductivity. Unusually high thermal conductivity makes carbon nanotube (CNT) the best promising candidate material for thermally conductive composites. However, the thermal conductivities of polymer/CNT nanocomposites are relatively low compared with expectations from the intrinsic thermal conductivity of CNTs. The 2 challenge primarily comes from the large interfacial thermal resistance between the CNT and the surrounding polymer matrix, which hinders the transfer of phonon dominating heat conduction in polymer and CNT. This article reviews the status of worldwide research in the thermal conductivity of CNTs and their polymer nanocomposites. The dependence of thermal conductivity of nanotubes on the atomic structure, the tube size, the morphology, the defect and the purification is reviewed. The roles of particle/polymer and particle/particle interfaces on the thermal conductivity of polymer/CNT nanocomposites are discussed in detail, as well as the relationship between the thermal conductivity and the micro-and nano-structure of the composites.

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“…For example, the thermal conductivity of X-shaped junctions decreased by ~20-80% compared with straight nanotubes [ 172 ]..…”

Section: Atomic Structurementioning

confidence: 99%

Thermal conductivity of carbon nanotubes and their polymer nanocomposites: A review

Han

Fina

2011

Progress in Polymer Science

2,278

1,323

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“…As we know, the thermal conductivity of the tube is greatly dependent on the length of the tube, and we have discussed this in our previous work [28]. In our present simulations, the length for the calculation of temperature gradient / is about 17 nm for armchair tubes and zigzag tubes to save the simulation time.…”

Section: The Effects Of Radius and Chirality On The Thermal Conductivmentioning

confidence: 80%

“…Therefore, the phonon-mean-free-path of the isolate tube is much longer than that of middle tube. The thermal conductivity of the middle (6,6) tube is more than 2000 W/m/K when it is ∼3 nm long (with is 12) and is increased with the increasing of the length of the tubes within a certain range, which is identical with [1,28,40,41]. Therefore, the IMJs play a major role in the thermal conductivity of the ( , 0)/( , )/( , 0) tube with two IMJs.…”

Section: Effects Of the Length Of The Middle Tube On The Thermal Condmentioning

confidence: 97%

“…The atomic configuration and the thermal conductivity of the defective tubes are shown in Figure 3. Discontinuities in the temperature profile across the defects have been observed in [28]. Conformational defects can reduce the thermal conductivity significantly.…”

Section: The Effects Of Stone-wales and Vacancy On The Thermal Conducmentioning

confidence: 99%

“…Meanwhile, Kondo et al [20] found that the thermal resistance of the 5-6 defects is smaller than that of the vacancy defects. In our previous work, we studied that the thermal conductivity of the nanotube with junctions was 20-80% less than that of a straight nanotube depending on temperature [28]. Other defects such as isotropic impurities [27], 3 -hybridized defect [29], chemisorptions [30], and oxidation on the thermal conductivity of SWCNTs were studied.…”

Section: Introductionmentioning

confidence: 99%

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The Thermal Conductivity of Carbon Nanotubes with Defects and Intramolecular Junctions

Zhou

Meng

Liu

et al. 2013

Journal of Nanomaterials

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The thermal conductivity of various carbon nanotubes with defects or intramolecular junctions was studied using nonequilibrium molecular dynamics approach. The results show that the thermal conductivity of both armchair and zigzag carbon nanotubes increased with the decrease of the radius of the tube. The thermal conductivity of armchair tube is higher than that of zigzag tube when the radii of the two tubes are kept almost same. Discontinuities appear on the temperature profile along the tube axial at the region of IMJ, resulting in the large temperature gradient and thus lower thermal conductivity of(n,n)/(m,0)tube with one IMJ and(m,0)/(n,n)/(m,0)tube with two IMJs. For the(m,0)/(n,n)/(m,0)tube with two IMJs, phonon mean free path of the middle(n,n)tube is much smaller than that of the isolate(n,n)tube.

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A comparative study on the influences of whisker and conventional carbon nanotubes on the electrical and thermal conductivity of polyether ether ketone composites

Wen

Wang

et al. 2021

J of Applied Polymer Sci

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In this study, the electrical and thermal conductivity of polyether ether ketone (PEEK)/carbon nanotubes (CNTs) with different types, namely whisker CNTs (Wh‐CNTs) and conventional CNTs were compared. PEEK/CNTs composites were melt mixed in PEEK via two screw extrusion technology. Moreover, the effects of different methods for mixing of PEEK/Wh‐CNTs, namely, dry mixing, wet mixing and melt mixing, were compared. The electrical and thermal properties were analyzed. A high thermal conductivity value of about 0.741 W/(m K) could be obtained upon loading with 10 wt% Wh‐CNTs and the PEEK/Wh‐CNTs composites had low volume resistivity value of 10.96 Ω cm at 10 wt% loading via melt mixing. Thermal conductivity values of 1.066 W/(m K) (out‐of‐plane) and 1.50 W/(m K) (in‐plane) were achieved with 10 wt% loading by wet mixing. Experimental results of out‐of‐plane thermal conductivity were more consistent with the Nan model. PEEK/Wh‐CNTs composites prepared by wet mixing exhibited higher thermal conductivity than the composites mixed using the two other methods. As the content of Wh‐CNTs in wet mixed PEEK/Wh‐CNTs nanocomposites increased, electromagnetic interference (EMI) shielding effectiveness (SE) was improved. The PEEK/Wh‐CNTs composites were 0.6 mm thick and showed an EMI SE of 21.5 dB.

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Thermal conductivity of an ultrathin carbon nanotube with an X-shaped junction

Cited by 30 publications

References 45 publications

Thermal conductivity of carbon nanotubes and their polymer nanocomposites: A review

Thermal conductivity of carbon nanotubes and their polymer nanocomposites: A review

The Thermal Conductivity of Carbon Nanotubes with Defects and Intramolecular Junctions

A comparative study on the influences of whisker and conventional carbon nanotubes on the electrical and thermal conductivity of polyether ether ketone composites

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