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  • 1
    Electronic Resource
    Electronic Resource
    Structural studies of nanoporous carbon produced from silicon carbide (1999)
    Springer
    Physics of the solid state 41 (1999), S. 808-810 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract X-ray diffraction and small-angle scattering study of nanoporous carbon samples prepared from polycrystalline α SiC and single-crystal 6H SiC is reported. The distribution function of carbon nanoclusters in size was found. In α SiC samples, the small size (10–12 Å) of nanoclusters is combined with their high size uniformity. Graphite-like nanoclusters 30–60 Å in size were found in samples of both types. In 6H SiC samples, such clusters make up a notable fraction of the volume. The experimentally observed structural anisotropy of the samples is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130879
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Structural study of nanoporous carbon produced from polycrystalline carbide materials: Small-angle x-ray scattering (1999)
    Springer
    Physics of the solid state 41 (1999), S. 1359-1363 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An x-ray small-angle scattering study is reported of the structure of nanoporous carbon prepared by chlorinating carbide compounds having different crystal structures (SiC, TiC, Mo2C). The measurements were carried out both in reflection and transmission. The angular dependences of the scattering intensity obtained are treated as a result of scattering from nanoparticles of different size. By unfolding the experimental curves into components corresponding to particles with different gyration radii R g, scatterer distribution functions in gyration radius m(R g) were found. It is shown that, irrespective of the type of the starting carbide, particles with R g∼5 Å make up the largest fraction in porous carbon. Samples prepared from different carbides differ in the degree of nanoparticle uniformity in size. The most uniform in size are nanoparticles in the samples prepared from SiC, in which the average value R g av 〈6 Å. Nanoparticles in the porous carbon produced from Mo2C are about twice larger.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130998
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  • 4
    Electronic Resource
    Electronic Resource
    Photoluminescence spectra of ultradisperse diamond (1997)
    Springer
    Physics of the solid state 39 (1997), S. 1928-1929 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The first study of materials based on ultradisperse diamond produced by detonation is reported. A luminescence band in the visible has been observed, and some of its structural features have been interpreted by analogy with the known luminescence bands of centers in synthetic and natural diamonds. A comparison of the spectra obtained from ultradisperse diamond samples with the surface modified by different chemical treatments suggests that their pattern is governed to a considerable extent by the presence of a graphitic layer on the grain surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130202
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    Paper (German National Licenses)
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  • 5
    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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  • 6
    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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