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  • 1
    Digitale Medien
    Digitale Medien
    Thermodynamic parameters of adsorption of adamantane and its derivatives on graphitized thermal carbon black (2000)
    Springer
    Russian chemical bulletin 49 (2000), S. 1988-1992 
    Details
    ISSN: 1573-9171
    Schlagwort(e): adamantane derivatives ; adsorption ; graphitized thermal carbon black ; molecular statistical calculations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The adsorption equilibrium constants for adamantane, 1-fluoro-, 1-chloro-, 1,3-difluoro-, 1,3-dichloro-, 1,3-dibromo-, and 1-hydroxyadamantane, and methyl 1-adamantyl ketone were determined by gas chromatography. The results were compared with molecular statistical calculations based on the known atomic-atomic potentials of the interaction of atoms of the sorbate molecule with the C atom of graphitized thermal carbon black (GTCB). The experimental adsorption heats exceed the calculated values by 3-10 kJ mol-1. The reasons for this divergence are discussed. The changes in the adsorption entropy show that the molecules of the studied compounds form a layer of the ideal dimeric gas on the GTCB surface upon adsorption.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009511622918
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  • 2
    Digitale Medien
    Digitale Medien
    Averaging the pressure and flow rate of the carrier gas in a gas chromatographic column (1999)
    Springer
    Chromatographia 49 (1999), S. 449-453 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Average column pressure ; Average column flow ; Specific retention volume ; Distribution coefficient
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A systematic derivation of corresponding equations shows that averaging the pressure and the flow rate of the mobile phase in a gas chromatographic column over the column length and over the time that an unretained component resides in the column, requires the use of three different compressibility correction factors,j 2 1 ,j 3 2 , andj 4 3 . When multiplied by the adjusted retention volume,V R-VM, the Martin and James mobile phase compressibility correction factorj 3 2 , only, produces the value of specific retention volume,V g T , which is connected unambiguously with the thermodynamic phase distribution coefficient,K, of the sorbate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02467622
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