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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 36 (1964), S. 1526-1533 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit Hilfe der Methode der kleinsten Quadrate wurden unter ausnutzung von Orthogonalfunktionen gas-chromatographische Meßwerte für n-Hexan und n-Heptan auf Aerosilogel im Temperaturintervall von 55 bis 150°C mathematisch ausgewertet. Für diese Auswertung wurde die thermodynamische Gleichung, welche in der ersten Annäherung die Abhängigkeit der Enthalpie von der Temperatur berücksichtigt, benutzt. Es wurden die differentiellen Adsorptionswärmen und die Unterschiede ΔaCp der differentiellen Wärmekapazitäten im Gaszustand und im adsorbierten Zustand für n-Hexan und n-Heptan berechnet. Es wurde gezeigt, daß der Wert von ΔaCp sich bei der gegebenen Genauigkeit der experimentellen Resultate signifikant von Null unterscheidet.
    Abstract: Sommaire Le traitement mathématique des résultats expérimentaux, obtenus en chromatographie en phase gazeuse pour le n.hexane ou le n.heptane sur aerosilogel dans l'intervalle de températures 55° à 150°C, a été effectuée en appliquant la méthode des moindres carrés avec utilisation de fonctions orthogonales. Pour ce traitement on a utilisé la relation thermodynamique suppose que l'enthalpie est fonction de la température et que la différence des capacités calorifiques est constante. Les chaleurs d'adsorption ainsi que la différence ΔaCp entre les capacités calorifiques pour n.hexane et n.heptane tà l'état gazeux et à l'état adsorbés ont été calculées. II a été montré qu'avec la précision des measures expérimentalles donnée, la valeur ΔaCp s'écarte, de façon significative (le seuil de significaton étant 5%), de zéro.
    Notes: Summary Gas chromatographic data for n-hexane and n-heplane on aerosilogel obtained in the temperature interval 55 to 150°C were treated using the method of least squares with orthogonal functions. For this treatment the thermodynamic equation, which assumes that the enthalpy depends on the temperature and that the difference in heat capacities is constant, was used. The differential heats of adsorption as well as the difference in heat capacities ΔaCp of n-hexane and n-heptane in the adsorbed and gaseous state were calculated. It was shown that at the given accuracy of experimental data ΔaCp (for the 5% significance level) differed significantly from zero.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Auf der Oberflächevon graphitiertem themischen Ruß werden im Grenzgebiet kleiner Belegungen die Retentionsvolumina und Adsorptionswärmen der Alkane, Alkene, Alkadiene, Alkine, Cyclane,Cyclene von C1−C6 und Benzol bestimmt. Es werden die Abhängigkeiten der Adsorptionswärmen dieser Moleküle von ihren Polarisierbarkeiten Zhal der Kohlenstoffatome, Grad der Verzweigung und Cyclisierung, Anwesenheit von Doppelbindungen und konjugierten Bindungen untersucht.
    Abstract: Résumé On a déterminé les volumes de retention et les enthalpies d'adsorption des molécules d'alcanes, alcènes, alcadiènes, alcynes, cyclanes, cyclènes en C` à C6 et du benzène sur la surface du noir de carbone graphitisé par voie thermique pour les taux de recouvrement faibles. On a aussi étudié la relation entre les enthalpies d'adsorption de ces molécules et leur polarisabilité, leur nombre d'atomes de carbone, la ramification de leur chaîne, la cyclisation, le nombre de doubles liaisons et de doubles liaisons conjuguées.
    Notes: Summary The retention volumes and heats of adsorption at low surface coverages of graphitized thermal carbon black for C1−C6 alkanes, alkenes, alkadienes, alkynes, cyclanes, cyclenes, and benzene have been determined. The dependence of heats of adsorption of these molecules on polarisability, carbon number, isomerisation and cyclisation, the presence of double bonds and conjugated bonds were investigated.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 14 (1981), S. 107-109 
    ISSN: 1612-1112
    Keywords: Gas-adsorption chromatography ; Structure of molecules ; Indane, methylindanes ; Chromatoscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A molecular statistical calculation of the retention volumes at zero surface coverage on graphitized thermal carbon black using the atom-atom approximation for the potential energy of intermolecular interaction between adsorbate and adsorbent has been carried out for different structure models of indane, 2-methylindane and 5-methylindane molecules. By comparing the results of the calculations with measured retention volumes, plausible models have been chosen for the structure of the molecules studied.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 12 (1979), S. 498-499 
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 15 (1982), S. 245-248 
    ISSN: 1612-1112
    Keywords: Chromatoscopy ; Gas chromatography ; Graphitized carbon black ; Molecular structure and retention ; Aromatic hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A molecular-statistical calculation of the retention volumes at zero sample size on graphitized thermal carbon black is carried out for quasi-rigid molecules of fluorene, indene, 1-methylindene, 2-methylindene and three dimethylindenes. A reasonable agreement is observed between the calculated and the available experimental gas chromatographic data. The potential barrier to internal rotation and the torsional angle in styrene molecules are estimated by comparing theoretically calculated and measured retention volumes.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1612-1112
    Keywords: Gas-solid chromatography ; Gas-adsorption chromatography ; Henry's constants measurements, calculations ; Aromatic, cyclic hydrocarbons ; Chromatoscopy of tetralin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Retention volumes at zero sample size (Henry's constants) on graphitized thermal carbon black have been measured at a number of temperatures for benzene, all its methyl-substituted and some of alkyl-substituted derivatives, naphthalene, diphenyl, phenanthrene, anthracene, tetralin, cis- and trans-decalin, cyclohexane, adamantane and diamantane. The earlier published thermodynamic characteristics of adsorption of the aromatic hydrocarbons have been revised. A molecular statistical calculation of thermodynamic characteristics of adsorption using the atom-atom approximation for the energy of intermolecular interaction between adsorbate and adsorbent has been carried out for polycyclic hydrocarbons: adamantane, diamantane, cis- and trans-decalin. The measured retention volumes of tetralin have been used for the calculation of some parameters of geometric structure of the molecule.
    Type of Medium: Electronic Resource
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