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  • Alkaline degradation  (1)
  • orthorhombic subcell  (1)
  • Springer  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Infrared dichroism measurements on the alkyl chain packing of an ionic detergent intercalated between silicate layers (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 1098-1109 
    Details
    ISSN: 1435-1536
    Keywords: Key words Metal silicate hydrate layers ; infrared linear dichroism ; order parameter ; orthorhombic subcell ; tilt angle ; trimethylammonium group
    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: Abstract  Microcrystals of the metal silicate hydrate ilerite orient macroscopically on the surface of a ATR-crystals and thus, are accessible for infrared linear dichroism measurements. We present first results which indicate that the alkyl chain packing and the orientation of the polar group of dodecyltrimethylammoniumbromide (DTAB) intercalated between silicate layers can be determined in terms of infrared order parameters. The properties of DTAB can be modulated by the relative humidity of the surrounding atmosphere and by temperature. Upon heating DTAB undergoes a phase transition from a paraffin-like solid to a fluid phase. The former is characterized by the orthorhombic perpendicular packing of the frozen alkyl chains with tilted long axes. The interactions between the ionic groups of the surfactant and that of the host matrix stabilize the lamellar arrangement of DTAB in the crystalline and in the fluid phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050351
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  • 2
    Electronic Resource
    Electronic Resource
    The alkaline degradation of cellobiose to glucose and fructose (1985)
    Springer
    Monatshefte für Chemie 116 (1985), S. 961-971 
    Details
    ISSN: 1434-4475
    Keywords: Alkaline degradation ; Carbohydrates ; Kinetic studies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der alkalische Abbau von Cellobiose wurde mit 0.01N bis 0.1N NaOH im Temperaturbereich von 60 bis 85°C untersucht. Gleichzeitig wurden die gebildete Glucose und Fructose analysiert. Bei niedrigen Alkalikonzentrationen wird derpH Wert stark herabgesetzt, sodaß es innerhalb kurzer Reaktionszeiten zu einer Beendigung der Reaktion kommt. Bei höheren Alkalikonzentrationen ist diepH-Abnahme wesentlich geringer und der alkalische Abbau von Cellobiose gehorcht einer Reaktion 1. Ordnung. Durch die Anwendung eines vereinfachten Reaktionsschemas konnten auch die Folgereaktionen der Glucose- und Fructosebildung mathematisch erfaßt werden.
    Notes: Abstract The alkaline degradation of cellobiose by 0.01 to 0.1N NaOH at temperatures between 60 and 85°C was studied. At the same time the formation of glucose and fructose was analyzed. At lower alkali concentrations, the production of acidic compounds lowered thepH to such an extent that the hydrolyzing reaction ceased within a relatively short time. At higher alkali concentrations thepH change is much smaller and first order reaction rates of the cellobiose degradation were obtained. Through the application of a simplified reaction mechanism the consecutive reactions of the glucose and fructose formation were evaluated mathematically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809189
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