Nickel/carbon nanocomposite

STRUCTURE AND TRIBOLOGICAL PROPERTIES OF NICKEL/CARBON NANOCOMPOSITE FILMS FORMED BY MICROWAVE PLASMA-ASSISTED... 

The result of these arrangements will be homogeneous metal particles/ nanocomposites distribution in acetylacetone ligand shell. In the capacity of conductive filler silver nanoclusters/nanocrystals and copper-nickel/ carbon nanocomposites can be used. It should be lead to decrease volume resistance from 10" to 10" Q-cm and increase of adhesive/paste adhesion. 

Silver filler is more preferable due to excellent corrosion resistance and conductivity, but its high cost is serious disadvantage. Hence alternative conductive filler, notably nickel-carbon nanocomposite was chosen to further computational simulation. In developed adhesive/paste formulations metal containing phase distribution is determined by competitive coordination and cross-linking reactions. 

FIGURE 8.19 Distribution of nickel/carbon nanocomposites in water. 

FIGURE 8.23 IR spectrum of nickel/carbon nanocomposite line suspension (FS) in polyethylene polyamine. 

In IR spectrum of nickel/carbon nanocomposite the band mostly appears at 1406 cm (relative area - 14.47). 

According to the investigations with transmission electron microscopy the formation of carbon nanofilm structures consisting of carbon threads is characteristic for copper/carbon nanocomposite. In contrast, carbon fiber structures, including nanotubes, are formed in nickel/carbon nanocomposite. There are several absorption bands in the range 2800-3050 cm which are attributed to valence oscillations of C-H bonds in aromatic and aliphatic compounds. These absorption bonds are connected with the presence of vaselene oil in the sample. It is difficult to find the presence of metal in the composite as the metal is stabilized in carbon nanostmcture. At the same time, it should be pointed out that apparently nanocomposites influence the structure of vaselene oil in different ways. The intensities and number of bands for Cu/C and Ni/C nanocomposites are different for ... 

The introduction of nickel/carbon nanocomposite (0.01% of the mass of pol mier filled on 65% of silver microparticles) into the epoxy polymer hardened with polyethylene polyamine leads to the decrease in electric resistance to 10 Ohmxcm (10 Ohmxcm without nanocomposite). 

According to the investigations with transmission electron microscopy the formation of carbon nanofilm structures consisting of carbon threads is characteristic for copper/carbon nanocomposite. In contrast, carbon fiber structures, including nanotubes, are formed in nickel/carbon nanocomposite. 

FIG U RE 9.11 IR spectrum of nickel/carbon nanocomposite fine suspension in polyethylene... 

FIGURE 1.5 IR spectra of copper/carbon (a) and nickel/carbon (b) nanocomposite powder. 

Hot vulcanization glue was modified with copper/carbon and nickel/carbon nanostmctures using toluol-based fine suspensions. On the test results of samples of four different schemes the tear strength increased up to 50% and shear strength - up to 80%, concentration of metal/carbon nanocomposite introduced was 0.0001-0.0003%. 

Roro, K.T., Tile, N., and Forbes, A. (2012) Preparation and characterization of carbon/nickel oxide nanocomposite coatings for solar absorber applications. Appl Surf Sci, 258,7174-7180. 

Key words Carbon-nickel, CNx-nickel, nanocomposites, mechanical properties, structure... 

In this paper, the structure, morphology and the mechanical properties of d.c. magnetron sputtered nanocomposites of carbon or CNX and nickel are investigated. The addition of a metallic component to the amorphous or fiillerene-like material aimed to create new structural and physical properties in this kind of materials. 

The method of microwave plasma-assisted deposition allows to form nickel/hydrogenated amorphous carbon (Ni/a-C H) nanocomposite films. As the C2H2 concentration in Ar-C2H2 gas mixtures increased from 0 to 100 % the phase composition and precipitates size of Ni/a-C H films varies in the consequence Ni (15 nm)—>Ni + Ni3C (5-17 nm) Ni3C (17 nm)—> Ni + a-C H (1 nm) nc-G H (4 nm). The lowest friction coefficient and wear rate were obtained for Ni/a-C H amorphous nanocomposite films containing 20 % of sp3 bonds and deposited from the gas mixture with a C2H2 concentration of 60 %. 

There are indeed some other methods for producing silicon-based nanocomposites that appeared in the literature. Considerable work has been performed by J. Dahn s group and the decomposition of silane or polysilane pitch within carbonaceous matrices has been widely explored. Other methods based on HEMM of electrochemically inactive phases such as iron, nickel, titanium-nickel, titanium-carbon, silicon-carbon, and so on also have been examined using silicon powder with an initial particle grain size within either micrometric or nanometric ranges. The common problem in all these cases is that it is difficult to predict theoretically the appropriate matrix/silicon particles combination, i.e., there is no simple guidance rule in order to make reasonable predictions. An overview of all the above-described methods is summarized in Table 11.3. 

Tang, T. Chen, X.C. Chen, H. Meng, X.Y. Jiang, Z.W. Bi, W.G. Catalyzing carbonization of polypropylene itself by supported nickel catalyst during combustion of polypropylene/clay nanocomposite for improving fire retardancy. Chem. Mater. 2005, 17(11), 2799. 

Sattarahmady N, Heli H, Moosavi-Movahedi AA (2010) An electrochemical acetylcholine biosensor based on nanoshells of hollow nickel microspheres-carbon microparticles-Nalion nanocomposite. Biosens Bioelectron 25 2329-2335... 

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