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  • Articles: DFG German National Licenses  (4)
  • N2 adsorption  (2)
  • nitrogen adsorption  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Density of He adsorbed in micropores at 4.2K (1995)
    Springer
    Adsorption 1 (1995), S. 165-173 
    Details
    ISSN: 1572-8757
    Keywords: He adsorption ; micropore ; ultramicroporosity ; N2 adsorption ; zeolite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The density of He adsorbed in the cylindrical micropores of zeolites NaY and KL has been determined by He adsorption at 4.2K. He adsorption isotherms were then compared with N2 adsorption isotherms at 77K. Crystallographic considerations of the micropore volumes gave the density of the He adsorbed layer, which is necessary for assessment of ultramicroporosity of less-crystalline microporous solids, such as activated carbons. The determined density of He adsorbed in the cylindrical micropores of the zeolite was in the range 0.22 to 0.26 gml−1, greater than that of He adsorbed on a flat surface (0.202 gml−1). A value for the density of He between 0.20 to 0.22 gml−1 is recommended for evaluation of ultramicroporosity of a slit-shaped microporous system such as activated carbon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00705003
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Recrystallization-induced defect porous nature of C60 crystals (1996)
    Springer
    Adsorption 2 (1996), S. 153-156 
    Details
    ISSN: 1572-8757
    Keywords: fullerene ; micropore filling ; N2 adsorption ; point defect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Defective state of C60 crystals was controlled by the recrystallization and annealing. The defective structure was examined by the X-ray diffraction and N2 adsorption at 77 K. Recrystallized C60 crystals without annealing showed broad diffraction peaks and the N2 adsorption isotherm had marked low pressure uptake and a hysteresis in the high pressure region, indicating presence of both micropores and mesopores. The average micropore width was 8 Å which is closed to the C60 molecular size, while the average mesopore one was 50 Å. The mesopores disappeared by annealing up to 393 K. On the other hand micropores of 8 Å remained even by heating up to 673 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00127045
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrogen adsorption on fluorinated activated carbon fiber (1996)
    Springer
    Adsorption 2 (1996), S. 293-297 
    Details
    ISSN: 1572-8757
    Keywords: micropore analysis ; nitrogen adsorption ; activated carbon fiber surface fluorination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Nitrogen adsorption isotherms for fluorinated activated carbon fiber (F-ACF) and fluorinated carbon black (F-CB) were measured at 77 K. Surface structures of F-ACF and F-CB were examined by α s -plot analysis using the adsorption data on the nonporous carbon black (CB) and F-CB. The surface energy of F-ACF was lower than that of ACF. The micropore structure of ACF was preserved even after fluorination, although the limiting adsorption amount and the micropore width decreased with fluorination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879544
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The Pore Structure Determination of Carbon Aerogels (1998)
    Springer
    Adsorption 4 (1998), S. 187-195 
    Details
    ISSN: 1572-8757
    Keywords: mesopore structure ; Saam-Cole theory ; adsorption hysteresis ; carbon aerogel ; nitrogen adsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The detailed adsorption isotherms of nitrogen on carbon aerogels at 77 K were measured. The N2 adsorption isotherm had a marked hysteresis. The adsorption isotherms were analyzed by high resolution αs-plots to evaluate their porosity. The αs-plots showed an explicit upward deviation from the linearity below αs = 0.5, suggesting the presence of micropores. The mesoporosity and microporosity were separately determined from the αs-plot. The predominant pores in carbon aerogels were mesopores and the percentage of micropores was in the range of 5 to 10% of the total pore volume. The N2 adsorption hysteresis was analyzed with the Saam-Cole theory under the assumption of the cylindrical pore shape. The parameters determined from the Saam-Cole method were associated with the carbon aerogel structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008839913594
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    Paper (German National Licenses)
    Fulltext
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