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  • Knudsen effusion method  (1)
  • asymmetry correction  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Determination of cell asymmetry in temperature-modulated DSC (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 1081-1088 
    Details
    ISSN: 1572-8943
    Schlagwort(e): asymmetry correction ; calibration ; heat flux calorimeter ; heat capacity ; power compensated calorimeter ; temperature modulated differential scanning calorimetry ; TMDSC
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The quality of measurement of heat capacity by differential scanning calorimetry (DSC) is based on the symmetry of the twin calorimeters. This symmetry is of particular importance for the temperature-modulated DSC (TMDSC) since positive and negative deviations from symmetry cannot be distinguished in the most popular analysis methods. Three different DSC instruments capable of modulation have been calibrated for asymmetry using standard non-modulated measurements and a simple method is described that avoids potentially large errors when using the reversing heat capacity as the measured quantity. It consists of overcompensating the temperature-dependent asymmetry by increasing the mass of the sample pan.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01996796
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Vapor Pressure Determination by Pressure DSC (1998)
    Springer
    Journal of thermal analysis and calorimetry 53 (1998), S. 431-439 
    Details
    ISSN: 1572-8943
    Schlagwort(e): Knudsen effusion method ; pressure DSC ; steel ball method ; vapor pressure determination
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A new pressure DSC module (Mettler DSC27HP) and its abilities for vapor pressure determination in the range of subambient pressure to 7 MPa are presented. To compare the new to an established method, vapor pressures of caffeine, naphthalene and o-phenacetin have been determined both by pressure DSC and the Knudsen effusion cell method. These results, including the derived heats of evaporation and heats of sublimation, are compared to literature values.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1010133106907
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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