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  • 1
    ISSN: 1573-4854
    Keywords: intercalation ; solid-state ion exchange reactions ; montmorillonite ; organoammonium salts
    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 Organoammonium-montmorillonite intercalation compounds were prepared by solid-state ion exchange reactions which we have developed recently in order to understand the nature of the solid-state intercalation reactions. The reactions were carried out by grinding the mixtures of homoionic-montmorillonites and organoammonium (dodecyltrimethylammonium, tetramethylammonium, and tetrabutylammonium) halides (chloride, bromide, and iodide) at room temperature. Both of the counter anions of the organoammonium salts and the interlayer exchangeable cations of montmorillonite are concerned with the solid-state ion exchange reactions, indicating that the solid-solid reactions are thermodynamically governed. The solid-state ion exchange reactions lead to novel and different reactivities and intercalation compounds from those of conventional solution methods.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of porous materials 5 (1998), S. 127-132 
    ISSN: 1573-4854
    Keywords: mesoporous silica ; esterification ; pore size ; hydrophobicity ; silanol 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 Silanol groups in the mesoporous silica derived from a layered silicate, kanemite (NaHSi12O5 ċ3H2O), were esterified with alcohols (CnH2n+1OH n=2 , 4, and 8). Most of the silanol groups in the mesopores were modified with ethanol though some silanol groups remained after the reactions with 1-butanol and 1-octanol. With the increase in the alkyl chain lengths of the alcohols, the pore sizes of the esterified products decreased and the hydrophobicity increased.
    Type of Medium: Electronic Resource
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