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  • 1
    Electronic Resource
    Electronic Resource
    Comparison of Sorptometric and Thermoporometric Measurements on Porous Glass and Some Others (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 323-330 
    Details
    ISSN: 1572-8943
    Keywords: adsorption ; balance ; gravimetry ; sorption ; thermoporometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The results of surface structure investigations involving the use of thermoporometry and gas-sorptometry on porous glass, silica and a zeolite were compared. The most frequent and the mean pore width were found to be in accordance, but major differences in specific surface were observed. These two measuring methods complement each other, because with gas adsorption a dry sample is investigated, while with thermoporometry a sample immersed in a liquid is investigated. The probe molecules (nitrogen or noble gas and water or benzene, respectively) differ in size. The features of the two methods are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010194432703
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Gravimetric, Volumetric And Calorimetric Studies of The Surface Structure of Portland Cement (2000)
    Springer
    Journal of thermal analysis and calorimetry 62 (2000), S. 435-441 
    Details
    ISSN: 1572-8943
    Keywords: calorimetry ; cement ; gravimetry ; sorption ; surface ; thermoporometry ; volumetry ; water adsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Dry cement powder and hardened cement paste were characterised by means of laser granulometry and volumetric measurement of the nitrogen adsorption isotherm at 77 K. Water sorption isotherms at ambient temperature were measured stepwise by means of a gravimetric apparatus. The isotherms show a very large hysteresis loop, reaching down to zero relative pressure, which reflects swelling of the cement gel. Thermoporometric measurements reveal that swelling of that gel consists in water take up within the continuously growing structure; no stable pore structure could be observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010194232213
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Anwendungsmöglichkeiten der HPLC bei der Trennung, Isolierung, Identifizierung und quantitativen Bestimmung von Substanzen aus komplexen Stoffgemischen—am Beispiel von Carbonsäuren in Natriumaluminatlaugen aus dem Bayerprozeß der Aluminiumoxidgewinnung (1982)
    Springer
    Chromatographia 15 (1982), S. 107-116 
    Details
    ISSN: 1612-1112
    Keywords: HPLC ; Carboxylic acids ; Bayer process ; Aluminate liquors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird die Anwendung der Hochdruckflüssigchromatographie (HPLC) in Bezug auf die Identifizierung und quantitative Bestimmung von Carbonsäuren in Aluminatlaugen aus dem Bayerprozeß beschrieben. Die Vorgehensweise besteht in folgenden Teilschritten: Optimierung von HPLC Phasensystemen zur Trennung von synthetischen Gemischen von Carbonsäuren, Aufarbeitung der Aluminatlauge, semi-präparative Isolierung von Substanzen, Identifizierung auf flüssigchromatographischem Wege und durch Massenspektrometrie, quantitative Bestimmung durch Peakhöhenauswertung mit Hilfe externer Standards.
    Notes: Summary The paper describes the application of high performance liquid chromatography (HPLC) to the identification and quantitation of carboxylic acids in aluminate liquors from the Bayer process. The procedure comprises the following consecutive steps: optimization of HPLC phase systems employing synthetic mixtures of carboxylic acids, clean-up of the liquor, semi-preparative isolation of substances, identification by means of HPLC and mass spectrometry and estimation based on peak height measurement using external standards.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02290443
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    Paper (German National Licenses)
    Fulltext
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