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  • 1980-1984  (1)
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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigation on the Silicate Constitution in Trimethyl- and Triethyl-2-hydroxyethyl-ammoniumsilicate SolutionsIn trimethyl-2-hydroxyethyl-ammoniumsilicate solutions with molar N:Si ratios of 1:1 to 2:1 only double four-ring silicate anions are observed. In triethyl-2-hydroxyethyl-ammoniumsilicate solutions with the same molar N:Si changing quantities of double three-ring and double four-ring silicate anions are detectable. There is a range of SiO2 concentrations, where these two silicate anion constitutions dominate among all the SiO2 existing in the solutions. Increased quantities of alkali hydroxides effect the decomposition of double ring silicates, the decomposing effect of sodium and potassium hydroxide differing in their strength.
    Notes: In Trimethyl-2-hydroxyethylammoniumsilicatlösungen liegen bei molaren Verhältnissen Organoammoniumbase zu Siliciumdioxid von 1 bis 2 vorwiegend Doppelvierringsilicationen vor, während in Triethyl-2-hydroxyethylammoniumsilicatlösungen für gleiche Molverhältnisse in wechselnder Menge Doppeldreiring- und Doppelvierringspezies gefunden werden. Es existiert ein Konzentrationsbereich, in welchem diese beiden Silicatkonstitutionen, bezogen auf das gesamte in der Lösung vorliegende SiO2, dominieren. Steigender Gehalt beider Alkylalkanolammoniumsilicatlösungen an Alkalihydroxid führt zum Abbau der Doppelringsilicationen, wobei die destrukturierende Wirkung von Natrium- und Kaliumhydroxid unterschiedlich stark ist.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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