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  • 1
    Electronic Resource
    Electronic Resource
    Structures and functions of reaction interfaces developed during solid-state dehydrations (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 1135-1145 
    Details
    ISSN: 1572-8943
    Keywords: dehydration ; hydrates ; interfaces ; mechanisms ; solid-state reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The literature reveals that the mechanisms of some solid-state dehydrations are more complicated than has been generally accepted. Reactions at a thin advancing reactant-product interface provide the geometric models on which the most widely employed rate equations are based. For some systems, this “thin interface” model is a simplification of observed behaviour. Elimination of water from crystallographic sites may occur to a significant extent within a much thicker zone of reactant towards which the active interface is progressing. Consequently the region of chemical change may not coincide with the region of structural transformation. Limited initial dehydration may occur across all crystal faces prior to the onset of a nucleation and growth process that is usually regarded as the dominant rate process in the dehydrations of many large crystals. Experimental observations for solid-state dehydrations are discussed and reaction mechanisms with different rate controlling processes are distinguished. Studies of dehydrations have contributed substantially to the theory of solid-state reactivity, and advances in understanding may have wider application to other solid-state reactants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01983668
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A monolayer model of the interfacial region of microemulsions (1988)
    Springer
    Colloid & polymer science 266 (1988), S. 823-831 
    Details
    ISSN: 1435-1536
    Keywords: Mixedmonolayers ; tetradecanol ; oleic acid ; water/airinterface ; interference between water/oil ; microemulsions ; adsorption isotherms
    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 Mixed monolayers of tetradecanol and oleic acid at the water-air interface were studied to provide a static “related structure” featuring the interface between water and oil of water-dodecane microemulsions. The films of pure components as a function of temperature show a strong area contraction between 25 ° and 30 °C, caused by a change in the head groups hydration. This agrees with similar discontinuities found for some properties of the microemulsion in the same temperature range. At the water-air interface, the composition range of tetradecanol/oleic acid mixtures with the highest thermodynamic stability corresponds to the same stability range of the water-in -dodecane-potassium oleate microemulsions. Adsorption isotherms of tetradecanol and hexanol at the dodecane-water interface were studied to compare the surface behaviour of the two alcohols; the results indicate that the two alcohols have very similar two-dimensional surface phases and adsorption energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01417866
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    Paper (German National Licenses)
    Fulltext
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