Low frequency electromagnetic shielding efficiency of composites based on ethylene propylene diene monomer and multi‐walled carbon nanotubes

2020 ◽  
Vol 31 (12) ◽  
pp. 3272-3280
Author(s):  
Ján Kruželák ◽  
Andrea Kvasničáková ◽  
Roderik Plavec ◽  
Elemír Ušák ◽  
Mariana Ušáková ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Low Frequency ◽  
Electromagnetic Shielding ◽  
Ethylene Propylene Diene Monomer ◽  
Ethylene Propylene ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Studies on Thermal Conductivity of MWNTs/EPDM Composites by the Heat Probe Method

2012 ◽  
Vol 184-185 ◽  
pp. 1221-1225
Author(s):  
Xiao Guang Zhang ◽  
Ying Jie Ji ◽  
Shi Gang Wang ◽  
Qing Lin Hou
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Probe Method ◽  
Ethylene Propylene Diene Monomer ◽  
Maximum Difference ◽  
Anisotropic Behavior ◽  
Ethylene Propylene ◽  
Multi Walled Carbon Nanotubes ◽  
General Average ◽  
Walled Carbon Nanotubes

Multi-walled carbon nanotubes (MWNTs) were used as filler to enhance thermal conductivity of Ethylene propylene diene monomer (EPDM) polymers. In order to study the thermal conductivity of the MWNTs/EPDM composites in three different directions, an experiment was conducted by the heat probe method. The results show the general average thermal conductivity of MWNTs/EPDM composites is 0.323 W/m•K，which is significantly higher than EPDM polymers. The maximum difference of thermal conductivity between two directions is 8.7% relative to the general average, indicating obvious anisotropic behavior.

Surrounding effects in single-walled and multi-walled carbon nanotubes

2000 ◽  
Vol 633 ◽  
Author(s):  
Jean-Pierre Buisson ◽  
Olivier Chauvet ◽  
Serge Lefrant ◽  
Christophe Stephan ◽  
Jean-Michel Benoit
Keyword(s):  
Carbon Nanotubes ◽  
Low Frequency ◽  
Diameter Distribution ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

AbstractThe low frequency RBM observed in SWNTs has been proved to probe efficiently their diameter distribution. We have built a model to estimate the interactions between individual nanotubes when arranged in bundles which leads to a RBM upshift of 10 to 20 cm−1. In a PMMA-SWNTs composite, our model shows that an upshift can be also predicted as due to the stress applied by the polymer on the bundles upon breathing. Finally, the interaction between concentric layers in MWNTs can lead to low frequency modes originating from the RBM of individual tubes as observed experimentally.

Low Frequency Noise and Resistivity Characteristics of Hybrid Composites with Onion-Like Carbon and Multi-Walled Carbon Nanotubes

2019 ◽  
Vol 18 (02) ◽  
pp. 1940009 ◽  
Author(s):  
Marina Tretjak ◽  
Sandra Pralgauskaitė ◽  
Jonas Matukas ◽  
Jan Macutkevič ◽  
Jūras Banys ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Charge Carrier ◽  
Hybrid Composites ◽  
Low Frequency ◽  
Frequency Noise ◽  
Noise Spectral Density ◽  
Noise Characteristics ◽  
Conduction Mechanisms ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The comprehensive study of resistivity and low frequency (10[Formula: see text]Hz–20[Formula: see text]kHz) noise characteristics of hybrid polymer composites with multi-walled carbon nanotubes (MWCNTs) and onion-like carbon (OLC) particles in one material have been carried out in the wide temperature range ((75–380) K). The characteristic dependences on the fillers density and the dominant conduction mechanisms were investigated. At low temperature ((75–170) K), the resistivity dependences on temperature are well-fitted by the Mott’s formula for the quasi-one-dimensional charge carrier variable range hopping and Arrhenius law. At temperatures above 300[Formula: see text]K, the resistance increases with temperature due to matrix expansion and decreases due to the onset of the conductivity in the matrix. Low frequency voltage noise spectra comprise of 1/[Formula: see text] and Lorentzian-type components with characteristic times in the range from 0.1[Formula: see text][Formula: see text]s to 10[Formula: see text][Formula: see text]s; the noise spectral density in the region of Ohmic resistance is proportional to the voltage square. Therefore, thermally activated charge carrier capture centers randomly modulate the sample’s resistance and control the carrier hopping. Impulse noise and more sudden changes of the noise characteristics were observed at the temperatures, where the conduction mechanisms change.

Origin of the low-frequency band in Raman spectra of multi-walled carbon nanotubes synthesized by the CVD method

2013 ◽  
Vol 55 (7) ◽  
pp. 1459-1462 ◽  
Author(s):  
V. V. Bolotov ◽  
V. E. Kan ◽  
M. Yu. Biryukov ◽  
E. V. Knyazev ◽  
R. V. Shelyagin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectra ◽  
Frequency Band ◽  
Low Frequency ◽  
Cvd Method ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes
Sign in / Sign up

Export Citation Format

Share Document