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  • Electronic Resource  (2)
  • 1995-1999
  • 1965-1969  (2)
  • 1969  (2)
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  • Electronic Resource  (2)
Years
  • 1995-1999
  • 1965-1969  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 234 (1969), S. 1124-1127 
    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
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 229 (1969), S. 159-166 
    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
    Library Location Call Number Volume/Issue/Year Availability
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