scholarly journals Synergy Effects in Electromagnetic Properties of Phosphate Ceramics with Silicon Carbide Whiskers and Carbon Nanotubes

2019 ◽  
Vol 9 (20) ◽  
pp. 4388 ◽  
Author(s):  
Artyom Plyushch ◽  
Jan Macutkevič ◽  
Polina Kuzhir ◽  
Aliaksei Sokal ◽  
Konstantin Lapko ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Silicon Carbide ◽  
Wide Frequency Range ◽  
Electromagnetic Properties ◽  
Aluminium Phosphate ◽  
Silicon Carbide Whiskers ◽  
Synergy Effects ◽  
Multi Walled Carbon Nanotubes ◽  
The Difference ◽  
Walled Carbon Nanotubes

Hybrid composite materials based on an aluminium phosphate matrix with silicon carbide whiskers and multi-walled carbon nanotubes were studied in a wide frequency range (20 Hz to 36 GHz). It was demonstrated, that the addition of the silicon carbide whiskers enhances the dielectric permittivity and conductivity. This was explained by the difference in tunnelling parameters. Hybrid ceramics with nanotubes and whiskers also exhibits substantially improved electromagnetic shielding properties. The hybrid ceramics with 10 wt. % silicon carbide whiskers and a 1 mm thick 1.5 wt. % carbon nanotube layer, show higher than 50% absorption of electromagnetic radiation.

scholarly journals Electromagnetic Properties of Cold-Cure Silicone Mixtures Containing Multi-Walled Carbon Nanotubes

2020 ◽  
pp. 043-046
Author(s):  
A.G. Tkachev ◽  
◽  
N.R. Memetov ◽  
R.A. Stolyarov ◽  
N.A. Chapaksov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Physical Properties ◽  
Electromagnetic Radiation ◽  
Nanocomposite Materials ◽  
Electromagnetic Properties ◽  
Frequency Range ◽  
Concentration Dependences ◽  
Multi Walled Carbon Nanotubes ◽  
Properties Of Materials ◽  
Walled Carbon Nanotubes

Nanocomposite materials based on a cold-cure silicone mixture containing multi-walled carbon nanotubes were obtained. The concentration dependences of the radio-physical properties of materials were investigated. An increase in the efficiency of shielding electromagnetic radiation in the radio frequency range of wavelengths with increasing concentrations of multi-walled carbon nanotubes up to 10 wt. % was verified.

Electrical Transport Behavior in Phenolic Resin-based Composites Doped with Multi-walled Carbon Nanotubes

2007 ◽  
Vol 1006 ◽  
Author(s):  
Renato Amaral Minamisawa ◽  
Bopha Chhay ◽  
Daryush ILA
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Electrical Transport ◽  
Chemical Structure ◽  
Phenolic Resin ◽  
Structure Characterization ◽  
Electromagnetic Properties ◽  
Transport Behavior ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

AbstractThe reported electromagnetic properties of carbon nanotubes (CNT) make them a promising material for nanoelectronic applications [1,2]. Addition of CNT has recently been shown to enhance mechanical properties of phenolic-resin polymers [3]. We are attempting to control the electrical transport behavior of phenolic-based polymers doped with CNT as a function of the different nanopowder concentration added to the polymer. In that regard, we developed a technique to obtain a material with homogenous dispersion of nanopowders, an important factor that influences the transport behavior. The chemical structure characterization was also evaluated using optical techniques.

Study on Effect of Acid and Heat Treatments of Multi-Walled Carbon Nanotubes on Benzene Detection

2015 ◽  
Vol 1103 ◽  
pp. 105-111 ◽  
Author(s):  
Thanattha Chobsilp ◽  
Winadda Wongwiriyapan ◽  
Chaisak Issro ◽  
Worawut Muangrat ◽  
Weerawut Chaiwat ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Spin Coating ◽  
Room Temperature ◽  
Heat Treatments ◽  
Benzene Vapor ◽  
Pristine Mwcnts ◽  
Heat Treated ◽  
Multi Walled Carbon Nanotubes ◽  
The Difference ◽  
Walled Carbon Nanotubes

Effect of acid and heat treatments of multi-walled carbon nanotubes (MWCNTs) on benzene detection was investigated. For acid treatment, MWCNTs were treated by hydrochloric acid (HCl) for 1 h meanwhile other batches of MWCNTs were treated by heating under air ambient at 500°C for 1 h. Pristine, HCl-treated and heat-treated MWCNTs were separately coated with ethyl cellulose (EC) by spin-coating prior to fabrication of three different sensors named as EC/pristine MWCNTs, EC/HCl-MWCNTs and EC/heat-MWCNTs sensors, respectively. Each fabricated sensor was exposed to benzene vapor at room temperature for testing its sensing performance based on an increase in its electrical resistance which was sensitive to benzene vapor. Response of the sensors fabricated from EC/HCl-MWCNTs and EC/heat-MWCNTs were 3.66 and 1.92 times higher than that of EC/pristine MWCNTs, respectively. Sensitivity of all sensors would be attributed to swelling of EC, resulting in loosening of MWCNT network after benzene vapor exposure. In addition, the difference of sensing response of the EC/pristine MWCNTs when compared with those of EC/HCl-MWCNTs and EC/heat-MWCNTs would be ascribed to different crystallinity and functionalization of MWCNTs sidewalls, suggesting that acid and heat treatments of MWCNTs would be promising techniques for improvement of benzene detection.

Multi-Walled Carbon Nanotubes Synthesized by Methane Pyrolysis: Structure and Magnetic Properties

2014 ◽  
Vol 213 ◽  
pp. 60-64 ◽  
Author(s):  
Nikita S. Saenko ◽  
Albert M. Ziatdinov
Keyword(s):  
Carbon Nanotubes ◽  
Magnetic Properties ◽  
Fermi Level ◽  
Structural Defects ◽  
Multi Walled Carbon Nanotubes ◽  
The Difference ◽  
Level Degeneracy ◽  
Walled Carbon Nanotubes ◽  
Methane Pyrolysis ◽  
Zigzag Type

The structure and magnetic properties of multi-walled carbon nanotubes produced by catalytic pyrolysis of methane have been investigated by means of mutually complementary physical methods. The average sizes and number of carbon layers forming nanotubes, smearing of the density of states near the Fermi level, degeneracy temperature of gas of extrinsic current carriers, concentrations of localized spins and extrinsic two-dimensional current carriers have been determined. The conclusion has been drawn that ferromagnetic nanoparticles are present in the inner regions of nanotubes, including their tubular cavities. The difference in electronic structure near the Fermi level for carbon nanotubes and ordered graphite has been revealed. The possible reason is that the electronic states near zigzag-type sites of ends as well as edges of linear structural defects in nanotubes make greater contribution to the spectrum than that from similar sites of graphite.

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