scholarly journals Heat conduction in carbon nanotube materials: Strong effect of intrinsic thermal conductivity of carbon nanotubes

2012 ◽  
Vol 101 (4) ◽  
pp. 043113 ◽  
Author(s):  
Alexey N. Volkov ◽  
Leonid V. Zhigilei
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Heat Conduction ◽  
Carbon Nanotube ◽  
Intrinsic Thermal Conductivity

A closed-form model for estimating the effective thermal conductivities of carbon nanotube–polymer nanocomposites

2018 ◽  
Vol 233 (8) ◽  
pp. 2909-2919 ◽  
Author(s):  
Reza Moheimani ◽  
M Hasansade
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Closed Form ◽  
Polymer Nanocomposites ◽  
Micromechanical Model ◽  
Polymer Nanocomposite ◽  
Interfacial Thermal Resistance ◽  
Full Potential ◽  
Thermal Conductivities

This paper describes a closed-form unit cell micromechanical model for estimating the effective thermal conductivities of unidirectional carbon nanotube reinforced polymer nanocomposites. The model incorporates the typically observed misalignment and curvature of carbon nanotubes into the polymer nanocomposites. Also, the interfacial thermal resistance between the carbon nanotube and the polymer matrix is considered in the nanocomposite simulation. The micromechanics model is seen to produce reasonable agreement with available experimental data for the effective thermal conductivities of polymer nanocomposites reinforced with different carbon nanotube volume fractions. The results indicate that the thermal conductivities are strongly dependent on the waviness wherein, even a slight change in the carbon nanotube curvature can induce a prominent change in the polymer nanocomposite thermal conducting behavior. In general, the carbon nanotube curvature improves the nanocomposite thermal conductivity in the transverse direction. However, using the straight carbon nanotubes leads to maximum levels of axial thermal conductivities. With the increase in carbon nanotube diameter, an enhancement in nanocomposite transverse thermal conductivity is observed. Also, the results of micromechanical simulation show that it is necessary to form a perfectly bonded interface if the full potential of carbon nanotube reinforcement is to be realized.

Molecular Dynamic Study on Thermal Conductivity of Methyl-Chemisorption Carbon Nanotubes

2015 ◽  
Vol 1096 ◽  
pp. 520-523
Author(s):  
Yun Peng Song ◽  
Yan He ◽  
Yuan Zheng Tang
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Molecular Dynamics ◽  
Heat Conduction ◽  
Covalent Bonding ◽  
Methyl Groups ◽  
Leading Role ◽  
Adsorbed Carbon ◽  
Adsorption Density ◽  
Rapid Drop

The thermal conductivity at 300K of (6, 6) carbon nanotubes and chemi-adsorbed carbon nanotubes with methyl groups at random positions through covalent bonding (chemisorption) has been calculated as a function of adsorption density using molecular dynamics. The results exhibit a rapid drop in thermal conductivity with chemisorptions, even chemisorption as little as 1.0% of the nanotube carbon atoms reduces the thermal conductivity significantly. Investigate its reason, defects caused by chemisorption blocking the transmission of phonons which plays a leading role in the heat conduction of nanotubes, affecting the temperature distribution and energy transmission, leading to the thermal conductivity decline.

Effect of radial heat conduction on effective thermal conductivity of carbon nanotube bundles

2018 ◽  
Vol 61 (12) ◽  
pp. 1959-1966 ◽  
Author(s):  
JianLi Wang ◽  
YaMei Song ◽  
YuFeng Zhang ◽  
YuHan Hu ◽  
Hang Yin ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Conduction ◽  
Carbon Nanotube ◽  
Effective Thermal Conductivity ◽  
Nanotube Bundles ◽  
Radial Heat

Enhancement of heat conduction in carbon nanotubes filled with fullerene molecules

2015 ◽  
Vol 17 (41) ◽  
pp. 27520-27526 ◽  
Author(s):  
Liu Cui ◽  
Yanhui Feng ◽  
Xinxin Zhang
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Mass Transfer ◽  
Heat Conduction ◽  
High Thermal Conductivity ◽  
Low Frequencies

C60-encapsulation-induced high thermal conductivity of carbon nanopeapods owing to phonon couplings at low frequencies and enhancement in mass transfer.

Experimental Study on the Thermal Boundary Resistance Between an Individual Carbon Nanotube End and a Au Surface

2011 ◽  
Author(s):  
Jun Hirotani ◽  
Tatsuya Ikuta ◽  
Takashi Nishiyama ◽  
Koji Takahashi
Keyword(s):  
Thermal Conductivity ◽  
Experimental Study ◽  
Carbon Nanotube ◽  
Experimental Studies ◽  
Boundary Resistance ◽  
Thermal Boundary Resistance ◽  
The Past ◽  
Experiment Method ◽  
Very High ◽  
Intrinsic Thermal Conductivity

In the past decade, the very high intrinsic thermal conductivity of a carbon nanotube (CNT) has been successfully unveiled through experimental studies, but the thermal boundary resistance (TBR) between a CNT and ambient material still remains unclear. Some analytical and molecular dynamics studies have been reported on the TBR between a CNT and a surrounding material but there is no reliable experiment method to quantitatively investigate TBR between a CNT and a solid surface because of technical difficulties.

Carbon nanotube-copper exhibiting metal-like thermal conductivity and silicon-like thermal expansion for efficient cooling of electronics

Nanoscale ◽  
2014 ◽  
Vol 6 (5) ◽  
pp. 2669-2674 ◽  
Author(s):  
Chandramouli Subramaniam ◽  
Yuzuri Yasuda ◽  
Satoshi Takeya ◽  
Seisuke Ata ◽  
Ayumi Nishizawa ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Carbon Nanotube ◽  
Cooling Of Electronics

A composite that synergistically combines the best thermal properties of carbon nanotubes and copper is developed for efficient cooling of microelectronics.

scholarly journals Intrinsic Thermal Conductivity of Gelatin Estimated Independently of Heat Conduction Models

1991 ◽  
Vol 55 (2) ◽  
pp. 487-492
Author(s):  
Takaharu Sakiyama ◽  
Sockchong Han ◽  
Akihito Torii ◽  
Osato Miyawaki ◽  
Toshimasa Yano
Keyword(s):  
Thermal Conductivity ◽  
Heat Conduction ◽  
Intrinsic Thermal Conductivity

Thermal conductivity and flammability of multiwall carbon nanotube/polyurethane foam composites

2016 ◽  
Vol 53 (2) ◽  
pp. 215-230 ◽  
Author(s):  
JJ Espadas-Escalante ◽  
F Avilés ◽  
PI Gonzalez-Chi ◽  
AI Oliva
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Polyurethane Foam ◽  
Fire Behavior ◽  
Multiwall Carbon Nanotubes ◽  
Propagation Speed ◽  
Interfacial Thermal Resistance ◽  
Multiwall Carbon Nanotube ◽  
Multiwall Carbon

The thermal conductivity and fire response of multiwall carbon nanotube/polyurethane foam composites are investigated for ∼45 kg/m3 foams with multiwall carbon nanotube concentrations of 0.1, 1, and 2 wt.%. The thermal conductivity of such nanocomposites shows a modest increase with increased multiwall carbon nanotube content, which is explained by a high value of interfacial thermal resistance, as predicted by existent thermal models. A strong correlation between multiwall carbon nanotube content, foam’s cellular morphology, and fire behavior was observed. The flame propagation speed increases with the addition of 0.1 wt.% multiwall carbon nanotubes and then reduces as the multiwall carbon nanotube content increases. The mass lost after flame extinction reduces with the addition of multiwall carbon nanotubes, suggesting an increased resistance to flame attack due the multiwall carbon nanotube presence.

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