Anisotropic thermal conductivity of polypropylene composites filled with carbon fibers and multiwall carbon nanotubes

2014 ◽  
Vol 36 (11) ◽  
pp. 1951-1957 ◽  
Author(s):  
Ilya Mazov ◽  
Igor Burmistrov ◽  
Igor Il'inykh ◽  
Andrey Stepashkin ◽  
Denis Kuznetsov ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Carbon Fibers ◽  
Multiwall Carbon Nanotubes ◽  
Polypropylene Composites ◽  
Anisotropic Thermal Conductivity ◽  
Multiwall Carbon

scholarly journals Growth of Carbon Nanotube Forests on Carbon Fibers with a SiO2 Interlayer

2012 ◽  
Vol 1451 ◽  
pp. 97-102 ◽  
Author(s):  
Erica F. Antunes ◽  
Viviane Q. da Silva ◽  
Vagner E. C. Marques ◽  
Lilian Siqueira ◽  
Evaldo J. Corat
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fibers ◽  
Multiwall Carbon Nanotubes ◽  
Protective Layer ◽  
Silica Layer ◽  
Vertical Alignment ◽  
Simple Method ◽  
Iron Diffusion ◽  
Carbon Nanotube Forests ◽  
Multiwall Carbon

ABSTRACTCeramic barriers avoid catalyst diffusion to produce better multiwall carbon nanotubes (CNT) on carbon fiber fabrics (CF). We developed a simple method to produce efficiently a silica layer from TEOS pyrolysis at similar conditions of CNT growth from camphor and ferrocene mixtures. This protective layer prevents iron diffusion and allows the vertical alignment of CNTs.

Nucleation ability of multiwall carbon nanotubes in polypropylene composites

2003 ◽  
Vol 41 (5) ◽  
pp. 520-527 ◽  
Author(s):  
E. Assouline ◽  
A. Lustiger ◽  
A. H. Barber ◽  
C. A. Cooper ◽  
E. Klein ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Polypropylene Composites ◽  
Multiwall Carbon

Thermal conductivity of polypropylene-based composites with multiwall carbon nanotubes with different diameter and morphology

2014 ◽  
Vol 586 ◽  
pp. S440-S442 ◽  
Author(s):  
I.N. Mazov ◽  
I.A. Ilinykh ◽  
V.L. Kuznetsov ◽  
A.A. Stepashkin ◽  
K.S. Ergin ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Multiwall Carbon

FORMATION OF CARBON NANOTUBES ON CARBON PAPER AND STAINLESS STEEL SCREEN BY OHMICALLY HEATING CATALYTIC SITES

2002 ◽  
Vol 01 (03n04) ◽  
pp. 223-234 ◽  
Author(s):  
X. SUN ◽  
R. LI ◽  
G. LEBRUN ◽  
B. STANSFIELD ◽  
J. P. DODELET ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Stainless Steel ◽  
Gas Phase ◽  
Carbon Fibers ◽  
Multiwall Carbon Nanotubes ◽  
Ni Catalyst ◽  
Carbon Paper ◽  
Catalytic Sites ◽  
Negative Effect ◽  
Multiwall Carbon

A newly designed gas phase thermal decomposition reactor, ohmically heating the catalytic sites, has been used to synthesize multiwall carbon nanotubes (MWCNTs) on carbon paper and stainless steel screen. Co-Ni catalyst particles were dispersed by a silane intermediate layer adsorbed onto the carbon fibers or the stainless steel threads of the supports. MWCNTs were obtained on both substrates by a tip grown mechanism. They are about 20 μm in length and 15–50 nm in diameter. A methanol pretreatment of the carbon fibers significantly increased the density of the tubes on the carbon paper, but the same treatment had a negative effect on stainless steel. The MWCNTs, which adhere firmly to the carbon paper and the stainless steel screen, may find applications as electrodes in fuel cells, sensors and in photonics.

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.

scholarly journals Not Without Engineering

2001 ◽  
Vol 123 (02) ◽  
pp. 46-49 ◽  
Author(s):  
Arun Majumdar
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Room Temperature ◽  
Microelectromechanical Systems ◽  
Multiwall Carbon Nanotubes ◽  
University Of California ◽  
High Mechanical Strength ◽  
Optical Signals ◽  
The University ◽  
Multiwall Carbon

Recent experiments have shown that thermal conductivity of carbon nanotubes can be more than twice that of diamond. It should be noted that high mechanical strength often comes with high thermal conductivities. Recent experiments have shown that the thermal conductivity of carbon nanotubes can be as high as 3000 to 6000 W/m K at room temperature, which is more than twice that of diamond. It was recently shown by Alex Zettl and his group at the University of California, Berkeley that the relative motion between different shells of multiwall carbon nanotubes has some unique properties and can serve as excellent mechanical bearings that do not undergo any wear. Recent work has led to multifunctional probes, which, besides topography, can detect thermal, electrical, magnetic, and optical signals at nanoscales. The engineering challenge now is to develop microelectromechanical systems (MEMS)-based probes that integrate multiple functions on a single tip.

scholarly journals Thermal Conductivity and Electrical Resistivity of Melt-Mixed Polypropylene Composites Containing Mixtures of Carbon-Based Fillers

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1073 ◽  
Author(s):  
Beate Krause ◽  
Piotr Rzeczkowski ◽  
Petra Pötschke
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Electrical Resistivity ◽  
Carbon Fibers ◽  
Filler Content ◽  
Synergistic Effects ◽  
Volume Resistivity ◽  
Graphite Nanoplatelets ◽  
Polypropylene Composites ◽  
Carbon Based

Melt-mixed composites based on polypropylene (PP) with various carbon-based fillers were investigated with regard to their thermal conductivity and electrical resistivity. The composites were filled with up to three fillers by selecting combinations of graphite nanoplatelets (GNP), carbon fibers (CF), carbon nanotubes (CNT), carbon black (CB), and graphite (G) at a constant filler content of 7.5 vol%. The thermal conductivity of PP (0.26 W/(m·K)) improved most using graphite nanoplatelets, whereas electrical resistivity was the lowest when using multiwalled CNT. Synergistic effects could be observed for different filler combinations. The PP composite, which contains a mixture of GNP, CNT, and highly structured CB, simultaneously had high thermal conductivity (0.5 W/(m·K)) and the lowest electrical volume resistivity (4 Ohm·cm).

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