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  • 2000-2004  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    On fractal nature of the structure of nanoporous carbon obtained from carbides (2000)
    Springer
    Physics of the solid state 42 (2000), S. 1176-1181 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The curves describing small-angle x-ray scattering at npor-C nanoporous carbon samples obtained from polycrystalline α-SiC, TiC, and Mo2C and a 6H-SiC single crystal have been analyzed. An algorithm is developed for taking into account the corrections to experimental curves for the intensity of the primary beam transmitted through the sample and the height of the inlet slit in these measurements. Two systems of nanoclusters observed in the npor-C structure differ in the type of stacking of structural elements: small-scale mass fractals of a dimension 1〈D 2〈3 and a size L 2=50–90 Å, which depend on the type of the initial carbide, and large-scale nanoclusters having a size L 1〉550 Å. In most samples, large-scale nanoclusters can be regarded as objects with a fractal surface and a dimension 2〈D 1〈13, which also depends on the type of the initial carbide. Large-scale nanoclusters in npor-C obtained from Mo2C prove to be mass fractals with a dimension D 1〉2. Peculiarities of the structure formation of nanoporous carbon obtained from various carbides are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131336
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Self-organization in the formation of a nanoporous carbon material (2000)
    Springer
    Physics of the solid state 42 (2000), S. 2314-2317 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new mechanism of nanopore formation in carbon materials produced by the interaction of car-bides with chlorine is proposed. In essence, this method is the following. A series of nonlinear chemical reactions proceed in the course of a chemical interaction between chlorine and a carbide. If the external parameters, the component fluxes, and the diffusion rates satisfy certain relations, the self-organization process can occur. This process results in the creation of a periodic nanoporous structure in the carbon material formed. A mathematical model is proposed, the main characteristics of the process are calculated, and the restrictions on the parameters at which the formation of the porous structure becomes possible are found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1332156
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetics of Sorption and Release of Hydrogen by Nanoporous Carbon (2000)
    Springer
    Materials science 36 (2000), S. 499-505 
    Details
    ISSN: 1573-885X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We investigate the process of hydrogen sorption by nanoporous carbon at temperatures of 570–970 K by using the method of thermodesorption spectrometry. Thermodesorption spectra consist of several phases caused by chemisorption in several independent states on the surface of nanoporous carbon. Each of the states is characterized by the activation energy and pre-exponential factors of desorption rate constants. We obtain estimates for the efficient activation energy and heat of sorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1011397618417
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    Paper (German National Licenses)
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