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.

Electrical and Mechanical Properties of Ethylene Vinyl Acetate Based Composites

2012 ◽  
Vol 714 ◽  
pp. 193-199 ◽  
Author(s):  
Klaudia Czaniková ◽  
Zdenko Špitalský ◽  
Igor Krupa ◽  
Mária Omastová
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Multiwalled Carbon Nanotubes ◽  
Vinyl Acetate ◽  
Polymer Matrix ◽  
Ethylene Vinyl Acetate ◽  
Multiwalled Carbon ◽  
Scanning Electron ◽  
Properties Of Composites

In this study various composites based on the commercial ethylene vinyl acetate polymer matrix and multiwalled carbon nanotubes were prepared by casting from solution in the form of thick films. The degree of dispergation of carbon nanotubes in the polymer matrix was examined by scanning electron microscopy. Electrical conductivity and mechanical properties of those composites were investigated. It was observed that the electrical conductivity of composites increases with an increase of multiwalled carbon nanotubes content. The mechanical properties of composites were only slightly changed when compared with properties of neat ethylene vinyl acetate matrix.

scholarly journals CNT Reinforced Silver Nanocomposites: Mechanical and Electrical Studies

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Dinesh Kumar ◽  
Sonia Nain ◽  
Neena ◽  
Hemant Pal ◽  
Ravi Kumar
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Elastic Modulus ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Electrical Studies ◽  
Silver Nanocomposites ◽  
Silver Matrix ◽  
Nanoindentation Hardness

Nanoindentation hardness and elastic modulus of the silver/MWCNT (multiwalled carbon nanotubes) composites, fabricated by modified wet mixing technique, are studied in the present work. CNT reinforced silver nanocomposites, fabricated by introducing 4.5 volume percentages of CNT in the silver matrix, have increased elastic modulus and approximately 50% higher hardness than pure nanosilver. It is also observed from the results that the electrical conductivity of the fabricated materials was decreased by increasing the CNTs volume %.

Electrical conductivity of multiwalled carbon nanotubes/polyester polymer nanocomposites

2016 ◽  
Vol 50 (23) ◽  
pp. 3283-3290 ◽  
Author(s):  
K Abazine ◽  
H Anakiou ◽  
M El Hasnaoui ◽  
MPF Graça ◽  
MA Fonseca ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Polymer Nanocomposites ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon

scholarly journals Composite Yarns of Multiwalled Carbon Nanotubes with Metallic Electrical Conductivity

Small ◽  
2010 ◽  
Vol 6 (16) ◽  
pp. 1806-1811 ◽  
Author(s):  
Lakshman K. Randeniya ◽  
Avi Bendavid ◽  
Philip J. Martin ◽  
Canh-Dung Tran
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon

Conductivity percolation of carbon nanotubes (CNT) in polystyrene (PS) latex film

2010 ◽  
Vol 88 (3) ◽  
pp. 267-276 ◽  
Author(s):  
Ş. Uğur ◽  
Ö. Yargi ◽  
Ö. Pekcan
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Percolation Theory ◽  
Film Formation ◽  
Latex Film ◽  
Conductivity Measurements ◽  
Multiwalled Carbon ◽  
Transmission Technique ◽  
Annealing Step ◽  
Formation Behavior

In this study, the effect of multiwalled carbon nanotubes (MWNT) on film formation behaviour and electrical conductivity properties of polystrene (PS) latex film was investigated by using the photon transmission technique and electrical conductivity measurements. Films were prepared by mixing PS latex with different amounts of MWNTs, varying in the range between 0 and 20 wt%. After drying, MWNT content films were separately annealed above the glass transition temperature (Tg) of PS, ranging from 100 to 270 °C, for 10 min. To monitor film formation behavior of PS–MWNT composites, transmitted light intensity, Itr, was measured after each annealing step. The surface conductivity of annealed films at 170 °C was measured and found to increase dramatically above a certain fraction of MWNT (4 wt%) following the percolation theory. This fraction was defined as the percolation threshold of conductivity, Rc. The conductivity scales with the mass fraction of MWNT as a power law with exponent 2.27, which is extremely close to the value of 2.0 predicted by percolation theory. In addition, the increase in Itr during annealing was explained by void closure and interdiffusion processes. Film formation stages were modeled and the corresponding activation energies were measured.

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