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  • 1
    Electronic Resource
    Electronic Resource
    Studies of the surface composition of phenyl and cyanopropyl bonded phases under reversed-phase liquid chromatographic conditions using alkanoate and perfluoroalkanoate esters (1991)
    s.l. : American Chemical Society
    Analytical chemistry 63 (1991), S. 2849-2852 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00024a008
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermodynamics of gas adsorption on fractal surfaces of heterogeneous microporous solids (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 7589-7595 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Thermodynamic equations are derived for physical adsorption of gases and vapors on fractal surfaces of heterogeneous microporous solids. The influence of surface geometry on gas adsorption on a microporous solid is studied by analyzing the dependence of the differential molar enthalpy ΔH, the immersion enthalpy ΔHim, and the differential molar entropy ΔS on the fractal dimension D, which is used to characterize the surface irregularity. It is shown that −ΔH, −ΔHim, −ΔS, and the average adsorption potential A¯ increase as the fractal dimension of the surface accessible for adsorption increases. The dependence of these thermodynamic quantities on the fractal dimension D is attributed to the fact that the fraction of small micropores in microporous solids increases as the fractal dimension D increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458196
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  • 3
    Electronic Resource
    Electronic Resource
    An isotherm equation for adsorption on fractal surfaces of heterogeneous porous materials (1989)
    s.l. : American Chemical Society
    Langmuir 5 (1989), S. 1431-1433 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00090a032
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Investigations of water film on the surface of activated carbons by thermal analysis (1992)
    s.l. : American Chemical Society
    Langmuir 8 (1992), S. 229-232 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00037a042
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Multilayer adsorption from multicomponent liquid mixtures on solid surfaces (1981)
    Springer
    Monatshefte für Chemie 112 (1981), S. 175-185 
    Details
    ISSN: 1434-4475
    Keywords: Adsorption on heterogeneous surfaces ; Multicomponent liquid mixtures ; Multilayer liquid adsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird die Mehrschichtadsorption auf homogenen und heterogenen Oberflächen diskutiert. Bei der Berechnung der Molbrüche der Komponenten der ersten adsorbierten Schicht wurden Heterogenitäts-Effekte berücksichtigt. Die Modellrechnungen wurden an ternären flüssigen Mischungen vorgenommen.
    Notes: Abstract Multilayer adsorption of multicomponent liquid mixtures on homogeneous and heterogeneous solid surfaces is discussed. Heterogeneity effects of the adsorbent surface have been taken into account in calculation of mole fractions of the components in the first adsorbed layer. The model calculations, illustrating multilayer and heterogeneity effects, have been performed for adsorption of ternary liquid mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00911084
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  • 6
    Electronic Resource
    Electronic Resource
    A model of adsorption at liquid-solid interface involving association in the bulk phase (1982)
    Springer
    Monatshefte für Chemie 113 (1982), S. 669-680 
    Details
    ISSN: 1434-4475
    Keywords: Adsorption on heterogeneous surfaces ; Association ; Adsorption from solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird ein Adsorptionsmodell binärer, flüssiger Mischungen an homogenen und heterogenen Oberflächen von Feststoffen unter Beachtung der Assoziation eines der Bestandteile in der Flüssigkeitsphase diskutiert. Mit der aus dem Oberflächenüberschuß abgeleiteten Gleichung wurden entsprechende Modellberechnungen durchgeführt, die die mit Assoziation und Heterogenität verbundenen Effekte illustrieren. Die Gleichung wurde für die experimentellen Daten der Alkoholadsorption aus Benzol undn-Heptan an Kieselgel überprüft.
    Notes: Abstract A model of monolayer adsorption of binary liquid mixtures on homogeneous and heterogeneous solid surfaces involving association of one component in the bulk phase is discussed. Suitable model calculations, illustrating association and heterogeneity effects, have been performed according to an equation derived for adsorption excess. This equation has been examined by using the experimental data of adsorption of alcohols from benzene andn-heptane on silica gel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809005
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  • 7
    Electronic Resource
    Electronic Resource
    Application of a bilayer adsorption model for explaining the adsorption of esters fromn-heptane and benzene on silica gel (1982)
    Springer
    Monatshefte für Chemie 113 (1982), S. 925-932 
    Details
    ISSN: 1434-4475
    Keywords: Adsorption of esters of acetic acid on silica gel ; Bilayer liquid adsorption ; Heterogeneity effects in bilayer liquid adsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden die Adsorptionsisothermen der Methyl-, Ethyl-,n-Propyl undn-Butylacetate in Benzol undn-Heptanlösungen auf Kieselgel bei 298 K gemessen. Zur Interpretation der experimentellen Daten ist ein Zweischicht-Modell für die Oberflächenphase benutzt worden. Es wurde gezeigt, daß die Länge der Esterkohlenwasserstoffkette und die Aktivität des Lösungsmittels Einfluß auf die Struktur der Oberflächenform haben. Außerdem ist diese Struktur durch energetische Inhomogenität der Adsorbensoberfläche bestimmt.
    Notes: Abstract The adsorption isotherms of methyl, ethyl,n-propyl andn-butyl acetates from benzene andn-heptane on silica gel have been measured at 298 K. A bilayer model of surface phase has been used to interpret these experimental data. It has been shown that the chain length of the hydrocarbon part of the ester and the solvent affinity to the adsorbent influence the structure of the surface phase. Moreover, this structure is also determined by energetic heterogeneity of the adsorbent surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00799233
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Isotherm equations for adsorption on heterogeneous microporous solids (1986)
    Springer
    Monatshefte für Chemie 117 (1986), S. 7-19 
    Details
    ISSN: 1434-4475
    Keywords: Adsorption on heterogeneous microporous solids ; Gas adsorption on solids ; Liquid adsorption on solids ; Structural heterogeneity of solids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden Isothermengleichungen für die Adsorption aus Gas- oder Flüssigphasen an heterogenen mikroporösen Feststoffen mittels der Lösung vonStoeckli's Integralgleichung abgeleitet. In diesem Integral wurde dieDubinin-Radushkevich-Gleichung für die Beschreibung der lokalen Adsorption an Mikroporen mit identem Umriß und identer Größe benutzt. Das oben erwähnte Integral wurde für verschiedene Typen von Verteilungsfunktionen, die die Heterogenität der mikroporösen Strukturen von Festkörpern charakterisieren, gelöst.
    Notes: Abstract The overall isotherm equations have been derived for adsorption from gaseous and liquid phases on heterogeneous microporous solids by solvingStoeckli's integral equation. In this integral theDublin-Radushkevich equation is used to describe the local adsorption on micropores having identical shape and dimensions. The above integral has been solved for different types of distribution functions characterizing heterogeneity of microporous structure of the solids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809167
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  • 9
    Electronic Resource
    Electronic Resource
    Physical adsorption of gases on energetically heterogeneous solids II. Theoretical extension of a generalizedLangmuir equation and its application for analysing adsorption data (1984)
    Springer
    Monatshefte für Chemie 115 (1984), S. 1013-1038 
    Details
    ISSN: 1434-4475
    Keywords: Gas adsorption ; Multilayer adsorption ; Adsorption data analysis ; Heterogeneous solids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die generalisierteLangmuir-Gleichung, die in der 1. Mitt. beschrieben wurde, wird für die einlagige Adsorption mit lateralen Wechselwirkungen und für die viellagige Adsorption auf heterogenen Oberflächen mit einer Zufallsverteilung von Adsorptionsplätzen erweitert. Es werden neue Differentialfunktionen zur Untersuchung der mathematischen und physikalischen Eigenschaften dieser Gleichung eingeführt, die sich als fruchtbringend zur Interpretation von Adsorptionsdaten erweisen. Diese Funktionen werden zur Untersuchung von drei Gasadsorptionssystemen aus der Literatur herangezogen.
    Notes: Abstract The generalizedLangmuir equation proposed in part I is extended to monolayer adsorption with lateral interactions and to multilayer adsorption on heterogeneous surfaces with random distribution of adsorption sites. New differential functions, useful for interpreting the adsorption data, are introduced to study the mathematical and physical properties of this equation. These functions are applied to study three gas adsorption systems available from the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798769
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  • 10
    Electronic Resource
    Electronic Resource
    A simple method for determining the multilayer effects in adsorption of alcohols on silica gel (1986)
    Springer
    Monatshefte für Chemie 117 (1986), S. 579-588 
    Details
    ISSN: 1434-4475
    Keywords: Multilayer liquid adsorption ; Adsorption of alcohols ; Ternary liquid mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Adsorptionsisothermen binärer und ternärer flüssiger Mischungen vonn-Pentanol, 2-Pentanol oder 2-Methyl-2-butanol in Benzol und/odern-Heptan wurden bezüglich Kieselgel gemessen. Die experimentellen Daten der Adsorption wurden mittels des Mehrschichts-Modells der Oberflächenphase diskutiert. Die Hauptvoraussetzung dieses Modells ist die Annahme, daß die Oberflächenschichten, die sich in der Nähe des Kieselgels befinden, nur Moleküle der bevorzugt adsorbierten Komponente enthalten. Es wurde auch die Phasen-Austauschreaktion von Molekülen zwischen Phaseninnerem und der letzten Oberflächenschicht in Betracht gezogen. Auf der Basis dieser Theorie wurde für die untersuchten Systeme festgestellt, daß die Oberflächenphase aus drei Molekülschichten besteht. Außerdem wurden die ermittelten Volumina der Oberflächenphase berechnet.
    Notes: Abstract The excess adsorption isotherms ofn-pentanol, pentan-2-ol and 2-methylbutan-2-ol from binary and ternary solutions in benzene andn-heptane were measured. Experimental adsorption data are discussed in terms of a multilayer model of the surface phase. The main assumption of this model is that the surface layers being near the solid surface contain the molecules of the preferentially adsorbed component only. The phase-exchange reaction of molecules between bulk phase and last surface layer has been taken into account. On the basis of this theory it has been established for the investigated systems that the surface phase contains three molecular layers. Simultaneously appropriate surface phase capacities were determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00817894
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