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  • 1965-1969  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Simulation of BET type adsorption (1967)
    Springer
    Colloid & polymer science 221 (1967), S. 40-46 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Die Adsorption und Desorption an BET-Oberflächen mit begrenzter Anzahl von Schichten wird nach der Monte-Carlo-Methode behandelt. Die Zahl der adsorbierten Moleküle in Abhängigkeit von der Zeit wird bei konstanter Konzentration für eine einfache und für eine BET-Oberfläche mit Poren berechnet. Im letzteren Falle findet an keiner Stelle der Pore eine Adsorption oder Desorption statt, solange die Adsorptionsstelle am Eingang der Pore durch ein oder mehr adsorbierte Moleküle besetzt ist. Die Berechnungen zeigen, daß sowohl Adsorption als auch Desorption im letzten Fall verzögert worden und daß die Verzögerung bei höherer Konzentration des Adsorbates größer ist.
    Notes: Summary Adsorption and desorption on BET surfaces with finite allowable layers can be simulated by using the Monte Carlo method. For the following two cases, the numbers of adsorbed molecules have been calculated as a function of time. 1. A simple BET surface is placed under a constant concentration of adsorbate. 2. A BET surface including blind holes is placed under a constant concentration of adsorbate. Neither adsorption nor desorption takes place on any site in a hole so long as the site situated at the entrance of the hole is occupied by one or more adsorbate molecules. The calculation results show that both the adsorption and the desorption are delayed on the latter surface, and that the delay is more prominent at higher adsorbate concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02091922
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Colloid-chemical properties of ω-phenylalkyltrimethylammonium bromides in aqueous solutions (1969)
    Springer
    Colloid & polymer science 229 (1969), S. 159-166 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Surface tension, electrical conductivity, light scattering and nuclear magnetic resonance measurements were carried out in aqueous solutions of a series ofω-phenylalkyltrimethylammonium bromides. The conclusion is summarized as follows. 1) The pentyl and higher homologs form micelles in aqueous solutions, provided the concentration is larger than a definite value (CMC). As expected, CMC decreases and association number of a micelle increases with an increase in the alkyl-chain length. 2) The butyl derivative does not form large aggregates that are qualified to be called “micelles”. No distinct CMC is observed. 3) In a micellar solution, surfactant molecules are rapidly exchanged between micelles and bulk water phase. 4) Critical micelle concentration is affected by the introduction of a phenyl group at the end of an alkyl chain in such a manner as if 2.7 methylene groups were introduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01552711
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Simulation applied to the gel filtration of surfactants (1969)
    Springer
    Colloid & polymer science 234 (1969), S. 1124-1127 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung In dieser Mitteilung wird eine Simulation-Technik beschrieben, die zur Gel-Filtration eines Gemisches von zwei nichtionischen oberflächenaktiven Substanzen verwendbar ist. Die Verwendbarkeit wurde mit einem Gemisch von Decyl- und Dodecyl-dimethylamin-N-oxiden geprüft. Die theoretischen Elutionskurven zeigten gute Übereinstimmung mit der experimentellen Kurve. Es wird nicht nur experimentell, sondern auch theoretisch gezeigt, daß die Gel-Flitration eine zweckmäßige und bequeme Methode zur Isolierung der Komponente mit einer niedrigeren KMK von dem Gemisch liefert.
    Notes: Summary In this paper is described a simulation technique applicable to the gel filtration of a mixture of two nonionic surfactants. The applicability was tested by using a mixture of decyl- and dodecyl-dimethylamine-N-oxides. The theoretical elution curves showed a good agreement with the experimental ones. It can be shown not only experimentally but also theoretically that the gel filtration is a powerful and convenient method to isolate the component which has a lower CMC from the mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01501093
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Simulation of Langmuir type adsorption (1966)
    Springer
    Colloid & polymer science 209 (1966), S. 60-67 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Adsorptions- und Desorptionsphänomene können mit Hilfe einer Monte-Carlo-Methode simuliert werden. Die folgenden 4 Fälle wurden geprüft. 1. EineLangmuir-Fläche wird unter konstanter Konzentration von Adsorbat gesetzt. 2. EineLangmuir-Fläche wird in ein System gebracht, das eine konstante Zahl von Adsorbat-Molekülen enthält. 3. ZweiLangmuir-Flächen koexistieren in einem System, das eine definierte Zahl von Adsorbat-Molekülen enthält. 4. EineLangmuir-Fäche, die blinde Hohlräume enthält, ist in einer konstanten Konzentration von Adsorbat gesetzt. Weder Adsorption noch Desorption findet an irgend einer Stelle in einer Höhle statt, solange der Eingang zu dieser durch ein Adsorbatmolekül, das dort an einer Stelle sitzt, besetzt ist.
    Notes: Summary Adsorption and desorption phenomena can be simulated by using the Monte Carlo method. The following four cases were examined. 1. ALangmuir surface is placed under a constant concentration of adsorbate. 2. ALangmuir surface is placed in a system which contains a definite number of adsorbate molecules. 3. TwoLangmuir surfaces coexist in a system which contains a definite number of adsorbate molecules. 4. ALangmuir surface comprising blind holes is placed under a constant concentration of adsorbate. Neither adsorption nor desorption takes place on any site in a hole so long as the site situated at the entrance of the hole is occupied by an adsorbate molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01500049
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Synthese cyclischer 1,2,3-Triamine durch Umsetzung von Dialdehyden mit Nitromethan und Benzylamin (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 79 (1967), S. 530-531 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19670791109
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of Cyclic 1,2,3-Triamines by the Reaction of Dialdehydes with Nitromethane and BenzylaminePart 9 of Condensation of Nitromethane with Dialdehydes.- Part8: F. W. Lichtenthaler and H. K. Yahya, chem. Ber. 100, in press. (1967)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 6 (1967), S. 568-569 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No abstract.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196705681
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    Paper (German National Licenses)
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