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  • DSC  (2)
  • 71.70J  (1)
  • Ankopplung von GC-Detektoren  (1)
  • Springer  (4)
  • 1
    ISSN: 1618-2650
    Keywords: Chromatographie, HPLC ; Ankopplung von GC-Detektoren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Wenn gas-chromatographische Detektoren (GC-Detektoren) am Ausgang eines Flüssigkeits-Chromatographen (HPLC) benutzt werden sollen, muß man die mobile, flüssige Phase zunächst in die Gasform überführen. Wenn man nun die ReversedPhase-Chromatographie einerseits und den Flammenbanden-Detektor (FBD) mit In-Oberflächen für den spezifischen Nachweis von Cl bzw. Br bzw. J andererseits einsetzen will, muß man zusätzlich den Eluenten — z.B. Methanol + Wasser — entfernen. Im folgenden wird eine Anordnung beschrieben, die diese Arbeitsgänge mit Hilfe eines erhitzten Endlos-Bandes erledigt.
    Notes: Summary If GC-detectors shall be used as HPLC-detectors, a transformation of the liquid phase into a gas. must be achieved. In applying reversed phase chromatography on the one side and flame band detectors (FBD) with In-surfaces for the specific detection of Cl or Br or I on the other side, the eluent — for example methanol + water — must be removed additionally. In this paper a device is described performing these steps by help of a heated rotating endless band.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-6079
    Keywords: 76.30F ; 76.30H ; 71.70J
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The possibilities to identify small diluted paramagnetic cluster defects in solids by Electron Paramagnetic Resonance are demonstrated in two examples: the Mn 4 0 cluster and a Cu-Au cluster in silicon crystals. A comprehensive picture of the clusters can be given containing the chemical nature of the constituents, the spatial arrangement, the charge states and the electronic structure.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1572-8943
    Keywords: cold crystallization ; DSC ; heat capacity ; modulated temperature DSC ; poly(ethylene terephtalate)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The modulated temperature differential scanning calorimetric method (MT-DSC) yields three temperature dependent signals, an underlying heat capacity curve from the underlying heat flow rate (corresponding to the conventional DSC signal), and a complex heat capacity curve with a real part (storage heat capacity) and an imaginary part (loss heat capacity). These curves have been measured in the cold crystallization region for poly(ethylene terephtalate) with a modified Perkin-Elmer DSC-7. The underlying curve shows the well known large exothermic crystallization peak. The storage heat capacity shows a step change which reproduces the change in heat capacity during crystallization. This curve may be used as baseline, to separate the crystallization heat flow rate from the underlying heat flow rate curve. The loss heat capacity curve exhibits a small exothermic peak at the temperature of the step change of the storage curve. It could be caused by changes of the molecular mobility during crystallization.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1572-8943
    Keywords: calibration material ; calibration procedure ; DSC ; heat calibration ; heat flow rate calibration ; standards ; temperature calibration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Metrologically based measuring procedures and evaluation methods are recommended as guidance for practical temperature, heat and heat flow rate calibration of DSC instruments which are largely independent of instrumental, test and sample parameters. The relevant terms are defined, the measuring procedures and evaluation methods described, calibration materials and their characteristic data stated and guidance for the sample handling provided. Reference is made to three extended papers on calibration. The recommendations were developed by the working group ‘Calibration of Scanning Calorimeters’ of the German Society of Thermal Analysis (GEFTA).
    Type of Medium: Electronic Resource
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