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  • Raman spectroscopy  (2)
  • crystallization  (2)
  • 13C NMR  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Crystallization of Silica Xerogels: A Study by Raman and Fluorescence Spectroscopy (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 391-395 
    Details
    ISSN: 1573-4846
    Schlagwort(e): silica xerogels ; crystallization ; Raman spectroscopy ; Eu3+ luminescence
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Pure and europium doped silica xerogels were annealed at 1050°C to obtain full densification, and at 1300°C to induce crystallization. Raman spectroscopy, time resolved selective luminescence and lifetime measurements were performed on glassy and crystallized samples. We discuss the differences between the Raman spectra of the xerogel annealed at 1050°C and those of a commercial silica. The typical Raman structures of α -crystobalite are evident for the 1300°C annealed samples, but a glassy phase coexists, indicating an incomplete crystallization. Fluorescence measurements give information on the environment of the Eu3+ ions in the glassy and crystallized sample.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1026480212567
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Crystallization of silica xerogels: A study by raman and fluorescence spectroscopy (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 391-395 
    Details
    ISSN: 1573-4846
    Schlagwort(e): silica xerogels ; crystallization ; Raman spectroscopy ; Eu3+ luminescence
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Pure and europium doped silica xerogels were annealed at 1050°C to obtain full densification, and at 1300°C to induce crystallization. Raman spectroscopy, time resolved selective luminescence and lifetime measurements were performed on glassy and crystallized samples. We discuss the differences between the Raman spectra of the xerogel annealed at 1050°C and those of a commerical silica. The typical Raman structures of α-crystobalite are evident for the 1300°C annealed samples, but a glassy phase coexists, indicating an incomplete crystallization. Fluorescence measurements give information on the environment of the Eu3+ ions in the glassy and crystallized sample.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02436871
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
    Digitale Medien
    Digitale Medien
    Complete assignment of the aliphatic chains in dimers, trimers and polymer of 3-hexylthiophene through 2D-NMR spectroscopy (1995)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 33 (1995), S. 657-663 
    Details
    ISSN: 0749-1581
    Schlagwort(e): NMR ; 1H NMR ; 13C NMR ; dimers and timers of 3-hexylthiophene ; poly(3-hexylthiophene) ; 1H, 13C inverse detection ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The 1H and 13C signals of the hexyl chains of the title compounds were fully assigned. The regiochemical features of the aliphatic region of proton and carbon spectra were analysed in dimers and trimers. Dimers and trimers proved to be reliable model compounds in the regiochemical assignment of poly(3-hexylthiophene) even when the aliphatic region of proton and carbon spectra was involved. The chemical shifts of the protons of CH2(α)s and of the hexyl chain as a whole and those of the first three aliphatic carbons appear to be the most significant.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260330807
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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