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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 3 (1986), S. 163-167 
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Knowledge of the granulometric behaviour of dispersed systems is vital for a full and complete characterisation. Despite the variety of methods and devices which have been developed for this purpose, difficulties frequently arise in the practical determination of particle size distribution. In this paper it is shown, by means of examples, how measurements for surface modified and porous particles can be influenced by the behaviour of the material, and which approaches exist to obtain accurate values by taking this into account.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 369 (1969), S. 41-47 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Calcite is activated mechanically. Equilibrium pressure of thermal dissociation, enthalpy of solution, particle size, lattice distortion and free surface are determined. The increase of equilibrium pressure on mechanical activation is caused essentially by augmenting the disordered state of lattice. - ΔH, ΔG and ΔS are calculated from the equilibrium pressures. These values are decreasing with increasing time of activation. - Longtime grinding of calcite and aragonite too leads to an enantiotropic transformation until a mechanochemical equilibrium is reached.
    Notes: Calcit wird mechanisch aktiviert. Von den einzelnen Chargen werden Zersetzungs-gleichgewichtsdruck, Löseenthalpie, Primärteilchengröße, Gitterstörungen und freie Oberfläche bestimmt. Der Anstieg des Gleichgewichtsdruckes mit der mechanischen Aktivierung wird im wesentlichen durch die Erhöhung des Unordnungszustandes des Gitters verursacht. - Aus den Gleichgewichtsdrucken werden ΔH, ΔG und ΔS berechnet, die mit steigender Aktivierungszeit kleiner werden. - Langzeitmahlungen von Calcit und auch Aragonit führen zu einer enantiotropen Umwandlung bis zu einem mechanochemischen Gleichgewicht.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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