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  • TG  (4)
  • 1
    Electronic Resource
    Electronic Resource
    The use of thermogravimetry to follow the rate of evaporation of an ingredient used in perfumes (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 595-599 
    Details
    ISSN: 1572-8943
    Keywords: methyl benzoate ; perfumes ; TG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ingredients used in the manufacture of perfumes can be investigated by thermogravimetry. In this study the evaporation of methyl benzoate was investigated using a simultaneous TG-DTA unit. A rising temperature method of thermal analysis was used for the study. The rate of evaporation of the ingredient was calculated from a simple plot of percentage mass lossvs. time. A derivative plot of the same was used to calculate the coefficient of evaporation in a controlled atmosphere and regulated air flow rate. In a series of programmed temperature runs on the TGDTA unit it was shown that the evaporation process is zero order, and that the evaporation coefficients at each temperature can be fitted into the Arrhenius equation. The energy of activation, Eact can be calculated from the slope of the line. It was found to be 47 kJ mol−1. This value was compared and shown to approach the enthalpy of vaporization as calculated using the Troutons or Clausius Clapeyron equation
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01996741
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  • 2
    Electronic Resource
    Electronic Resource
    The production of active carbon from corn cobs by chemical activation (1997)
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 525-531 
    Details
    ISSN: 1572-8943
    Keywords: activation ; carbon ; corn cobs ; SEM ; TG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Corn cobs obtained as waste from the corn industry, were analyzed by a TG-DTA unit in an atmosphere of flowing nitrogen. The carbonaceous products so formed were then produced on a preparative scale and activated chemically using potassium hydroxide. This resulted in the formation of a carbon with a very high surface area. The active carbon produced was then examined using thermal analysis in the temperature jump mode on a thermogravimetry unit. From this data the kinetics of degradation of the active carbon was determined using zero order rate kinetics. The pore structure of the active material was also examined using SEM. TheE a for activated corn cobs was found to be 106 kJ mol−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979025
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  • 3
    Electronic Resource
    Electronic Resource
    Comparative thermal analysis study of two biopolymers, starch and cellulose (1997)
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 7-17 
    Details
    ISSN: 1572-8943
    Keywords: cellulose ; starch ; TG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The degradation of cellulose and starch samples in air and nitrogen has been investigated by thermal analysis techniques. The techniques employed were differential thermal analysis, rising temperature and temperature jump thermogravimetry. Rate data were obtained from these experiments and Arrhenius parameters calculated from these values. This data was used to determine the mechanism by which the cellulose and starch samples degraded. The Arrhenius parameters were also calculated. The behavior of starch and cellulose upon thermal analysis were compared and are reported.E act for corn starch was found to be 474 kJ mol−1 and for a cellulose 242 kJ mol−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979545
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  • 4
    Electronic Resource
    Electronic Resource
    The use of the temperature signal and its derivative in a TG-DTA simultaneous unit (1997)
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 719-726 
    Details
    ISSN: 1572-8943
    Keywords: aluminum ; carbon black ; DTA ; indium ; TG ; zinc ; zinc oxalate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Simultaneous TG-DTA units have a work station which allows plots to be made of temperature against time, as well as the conventional TG and DTA plots. These time-temperature plots and their derivatives can be used to show details of both exothermic and endothermic events. The melting behavior of zinc is used as illustrative of endothermic phase changes. Solid-solid transitions are exemplified by noting the transitions in quartz. Examples of chemical reactions being treated to temperature-time plots are the decomposition's of zinc oxalate in nitrogen (an endothermic event) and the oxidation of carbon black in air (a sustained exothermic event). This wide selection of exothermic and endothermic events serves to illustrate the details which can be drawn from any thermogravimetric plot irrespective of the other associated equipment present, which serves to reinforce the data presented in the present study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979202
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