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  • Analytical Chemistry and Spectroscopy  (2)
  • DSC  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Thermal analysis of hydrated calcium aluminates (1996)
    Springer
    Journal of thermal analysis and calorimetry 47 (1996), S. 765-774 
    Details
    ISSN: 1572-8943
    Schlagwort(e): calcium aluminates ; cement ; DSC
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Differential scanning calorimeter (DSC) has been used to study the dehydration characteristics of hydrated calcium aluminates such as CA, CA2 and C12A7 where C and A stand for CaO and Al2O3 respectively. Dehydration of CAH10 and C2AH8 (whereH=H2O) occur ∼ at 160–180°C and 200–280°C respectively. These two phases are unstable and ultimately get transformed to AH3 and C3AH6. Dehydration of AH3 and C3AH6 occur between 290 and 350°C and overlap at lower scanning rate. The activation energy for dehydration of the stable AH3 and C2AH6 phases has been found to be 107.16 and 35.58 kJ mol−1 respectively. The compressive strength of the hydrated calcium aluminates has been determined. The result shows that in the case of CA, almost 90% of ultimate strength has been attained in 1 day whereas in CA2, ultimate strength has been attained in 14 days and in C12A7 in 1 day. DSC results have been correlated with the rate of strength developments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01981812
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Carbon-13 NMR spectra of kauranoid diterpenesSymposium on Recent Developments in Organic Chemistry, Calcutta (1979). Abstracts, p. 38. (1980)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 14 (1980), S. 58-60 
    Details
    ISSN: 0030-4921
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Carbon-13 NMR spectra of a number of (-)-ent-kauranoids have been studied. An unambiguous selfconsistent assignment of resonances has been made by considering the changes in chemical shifts produced by the change of substituent(s).
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1270140114
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  • 3
    Digitale Medien
    Digitale Medien
    Carbon-13 NMR spectra of 1,6-bis derivatives of hexa-2,4-diynes (1988)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 26 (1988), S. 626-628 
    Details
    ISSN: 0749-1581
    Schlagwort(e): 13C NMR ; Hexa-2,4-diynes ; Sulphones Sulphoxides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 13C NMR data for 1,6-bis derivatives of hexa-2,4-diynes are reported. Introduction of a sulphone or sulphoxide moiety at C-1, C-6 in place of sulphide, ether or amino groups caused a 6-7 ppm upfield shift (β effect) for the C-2, C-5 carbons and a 3-4 ppm downfield shift (y effect) for the C-3, C-4 carbons.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260260720
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