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  • Knudsen effusion method  (1)
  • calibration  (1)
  • 1
    Electronic Resource
    Electronic Resource
    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
    Keywords: asymmetry correction ; calibration ; heat flux calorimeter ; heat capacity ; power compensated calorimeter ; temperature modulated differential scanning calorimetry ; TMDSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01996796
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Vapor Pressure Determination by Pressure DSC (1998)
    Springer
    Journal of thermal analysis and calorimetry 53 (1998), S. 431-439 
    Details
    ISSN: 1572-8943
    Keywords: Knudsen effusion method ; pressure DSC ; steel ball method ; vapor pressure determination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010133106907
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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