scholarly journals Temperature dependence of thermal conductivity enhancement in single-walled carbon nanotube/polystyrene composites

2010 ◽  
Vol 96 (8) ◽  
pp. 083105 ◽  
Author(s):  
Michael B. Jakubinek ◽  
Mary Anne White ◽  
Minfang Mu ◽  
Karen I. Winey
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Temperature Dependence ◽  
Thermal Conductivity Enhancement ◽  
Single Walled Carbon Nanotube ◽  
Conductivity Enhancement ◽  
Single Walled Carbon

scholarly journals Enhanced Thermal Conductivity of Water With Surfactant Encapsulated and Individualized Single-Walled Carbon Nanotube Dispersions

2012 ◽  
Author(s):  
S. Harish ◽  
Kei Ishikawa ◽  
Erik Einarsson ◽  
Taiki Inoue ◽  
Shohei Chiashi ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Effective Thermal Conductivity ◽  
Volume Fraction ◽  
Thermal Conductivity Enhancement ◽  
Optical Absorption Spectroscopy ◽  
Single Walled Carbon Nanotube ◽  
Conductivity Enhancement ◽  
Single Walled Carbon ◽  
Higher Temperature

In the present work, the effective thermal conductivity of single walled carbon nanotube dispersions in water was investigated experimentally. Single-walled carbon nanotubes (SWNTs) were synthesized using the alcohol catalytic chemical vapour deposition method. The diameter distribution of the SWNTs was determined using resonance Raman spectroscopy. Sodium deoxycholate (SDC) was used as the surfactant to prepare the nanofluid dispersions. Photoluminescence excitation spectroscopy (PLE) reveals that majority of the nanotubes were highly individualized when SDC was employed as the surfactant. The nanofluid dispersions were further characterized using transmission electron microscopy, atomic force microscopy (AFM) and optical absorption spectroscopy (OAS). Thermal conductivity measurements were carried out using a transient hot wire technique. Nanotube loading of up to 0.3 vol% was used. Thermal conductivity enhancement was found to be dependent on nanotube volume fraction and temperature. At room temperature the thermal conductivity enhancement was found to be non-linear and a maximum enhancement of 13.8% was measured at 0.3 vol% loading. Effective thermal conductivity was increased to 51% at 333 K when the nanotube loading is 0.3 vol%. Classical macroscopic models fail to predict the measured thermal conductivity enhancement precisely. The possible mechanism for the enhancement observed is attributed to the percolation of nanotubes to form a three-dimensional structure. Indirect effects of Brownian motion may assist the formation of percolating networks at higher temperature thereby leading to further enhancements at higher temperature.

Thermal and Electrical Transport Measurements of Single-Walled Carbon Nanotube Strands

2003 ◽  
Vol 788 ◽  
Author(s):  
Diana-Andra Borca-Tasciuc ◽  
Yann LeBon ◽  
Claire Nanot ◽  
Gang Chen ◽  
Theodorian Borca-Tasciuc ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Electrical Properties ◽  
Specific Heat ◽  
Electrical Transport ◽  
Published Data ◽  
Temperature Dependent ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Temperature Dependent Properties

ABSTRACTThis work reports temperature dependent thermal and electrical properties characterization of long (mm size) single-walled carbon nanotube strands. Electrical properties are measured using a 4-probe method. Thermal conductivity and specific heat capacity are determined using an AC driven, self-heating method. Normalized values of resistivity, thermal conductivity, specific heat, thermal diffusivity, and the temperature coefficient of resistance are reported. The trends observed in the temperature dependent properties are comparable with previously published data on multi-walled carbon nanotube strands measured with a similar technique.

The effect of imposed temperature difference on thermal conductivity in armchair single-walled carbon nanotube

2015 ◽  
Vol 26 (09) ◽  
pp. 1550105 ◽  
Author(s):  
Ali Mehri ◽  
Maryam Jamaati ◽  
Moslem Moradi
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Heat Transport ◽  
Temperature Difference ◽  
Nonequilibrium Molecular Dynamics ◽  
Tube Length ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Brenner Potential ◽  
Umklapp Scattering

Thermal conductivity of carbon nanotubes depends on various factors. The simulation of heat transport in armchair single-walled carbon nanotube by direct nonequilibrium molecular dynamics (NEMD) method employing Tersoff–Brenner potential indicates that, thermal conductivity decreases with increase in temperature difference between two ends of the tube. Increasing the imposed temperature differential along the tube axis, leads to domination of Umklapp scattering and impacts the heat transport. The applied temperature difference does not influence the behavior of thermal conductivity vs. tube length, diameter and temperature, but changes its value.

scholarly journals Conductivity enhancement in single-walled carbon nanotube bundles doped with K and Br

Nature ◽  
10.1038/40822 ◽  
1997 ◽  
Vol 388 (6639) ◽  
pp. 255-257 ◽  
Author(s):  
R. S. Lee ◽  
H. J. Kim ◽  
J. E. Fischer ◽  
A. Thess ◽  
R. E. Smalley
Keyword(s):  
Carbon Nanotube ◽  
Single Walled Carbon Nanotube ◽  
Conductivity Enhancement ◽  
Single Walled Carbon ◽  
Nanotube Bundles
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