Correlation of electrical conductivity, dielectric properties, microwave absorption, and matrix properties of composites filled with graphene nanoplatelets and carbon nanotubes

2015 ◽  
Vol 118 (4) ◽  
pp. 044105 ◽  
Author(s):  
A. A. Khurram ◽  
Sobia A. Rakha ◽  
Peiheng Zhou ◽  
M. Shafi ◽  
Arshad Munir
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Dielectric Properties ◽  
Microwave Absorption ◽  
Graphene Nanoplatelets ◽  
Matrix Properties ◽  
Properties Of Composites

Dielectric properties of Shell oil transformer oil with impurities of carbon nanotubes and fullerene C60

2021 ◽  
Vol 24 (04) ◽  
pp. 413-418
Author(s):  
O.V. Kovalchuk ◽  
◽  
I.P. Studenyak ◽  
T.M. Kovalchuk ◽  
E.A. Ayryan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Dielectric Properties ◽  
Fullerene C60 ◽  
Transformer Oil ◽  
C60 Fullerene ◽  
Cooling Efficiency ◽  
Fullerene Concentration ◽  
Multiwall Nanotubes

At the temperature 293 K, the influence of two types of nanoimpurities (carbon multiwall nanotubes and C60 fullerene) both separately and together on the dielectric properties of Shell oil transformer oil has been studied. It has been shown that these impurities do not significantly effect on the value of the dielectric permittivity of Shell oil, but more significantly increase its conductivity. It has been found that in the presence of nanotubes inside Shell oil, the dependence of its electrical conductivity on the fullerene concentration is nonmonotonic. The samples with the fullerene concentration 100 ppm have the highest conductivity. At the fullerene concentration 300 ppm, the conductivity of Shell oil with the impurities of carbon nanotube and C60 fullerene becomes almost equal to the electrical conductivity of Shell oil only with the impurities of carbon nanotubes. It has been suggested that C60 fullerene can be used to reduce the electrical conductivity of Shell oil with magnetic nanoparticles required to increase the cooling efficiency of transformers under the action of their own magnetic field.

Role of hybrid reinforcement of carbon nanotubes and graphene nanoplatelets on the electrical conductivity of plasma sprayed alumina coating

2018 ◽  
Vol 44 (4) ◽  
pp. 4508-4511 ◽  
Author(s):  
Aminul Islam ◽  
Biswajyoti Mukherjee ◽  
M. Sribalaji ◽  
O.S. Asiq Rahman ◽  
P. Arunkumar ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Graphene Nanoplatelets ◽  
Alumina Coating ◽  
Hybrid Reinforcement ◽  
Plasma Sprayed

scholarly journals Electric/dielectric properties of composites filled with onion-like carbon and multiwalled carbon nanotubes

2015 ◽  
Vol 55 (2) ◽  
Author(s):  
Ieva Kranauskaitė ◽  
Jūras Banys ◽  
Ewa Talik ◽  
Vladimir Kuznetsov ◽  
Nicolas Nunn ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Dielectric Permittivity ◽  
Average Distance ◽  
Wide Frequency Range ◽  
Electric Properties ◽  
Multiwalled Carbon ◽  
Conductivity Increase ◽  
Polyurethane Composites ◽  
Properties Of Composites

The dielectric/electric properties of polyurethane composites filled with carbon nanotubes (CNTs), onion-like carbon (OLC) and mixed onion-like carbon/carbon nanotubes are compared across a wide frequency range from hertz to terahertz. The highest value of dielectric permittivity and electrical conductivity is observed in composites with carbon nanotubes. However, the dielectric/electric properties of composites filled with onion-like carbon are also very attractive and can be improved by addition of small amounts of carbon nanotubes due to the strong synergy effect. In composites with inclusions of mixed onion-like carbon/ carbon nanotubes, the dielectric permittivity and electrical conductivity increase due to the decreasing of both the potential barrier for carrier tunneling and the average distance between nanocarbon clusters.

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