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  • Analytical Chemistry and Spectroscopy  (2)
  • silica xerogel  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Effect of Pr3+ Doping on the OH Content of Silica Xerogels (1998)
    Springer
    Journal of sol gel science and technology 13 (1998), S. 599-603 
    Details
    ISSN: 1573-4846
    Schlagwort(e): silica xerogel ; Pr3+ ; OH contents ; luminescence
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Pr2O3-SiO2 xerogels doped with different Pr/Si concentrations were annealed at 900°C for 120 h and then investigated by FTIR, NIR absorption, Raman and luminescence spectroscopies. It is observed that the content of surface silanol groups is lower for higher Pr3+ concentrations. Luminescence measurements indicate that the amount of the residual OH plays an important role in the spectroscopic properties of the Pr3+ ion and in particular the quantum yield of the emission from the 3P0,1 and 1D2 states.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008699412259
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  • 2
    Digitale Medien
    Digitale Medien
    Site selection spectroscopy of SiO2:Eu3+ gels (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 783-786 
    Details
    ISSN: 1573-4846
    Schlagwort(e): optical spectroscopy ; fluorescence line narrowing ; Eu3+ ; silica xerogel
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Silica gels doped with Eu3+ ions were studied at temperatures between 10 K and 300 K by site selection spectroscopy in samples heated up to 200°C. The 5D0 → 7F0 transition shows internal structures due to the different environments of the europium ions. Lifetimes, energy levels and homogeneous linewidths are site dependent. In the wet gel the Eu3+ ions prefer a liquid-like environment and only when the liquid is removed by heat treatment, the ion is linked more strongly to the silica network.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00486350
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  • 3
    Digitale Medien
    Digitale Medien
    Characterization of virus infected cell cultures by pyrolysis/direct chemical ionization mass spectrometry (1989)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 18 (1989), S. 757-760 
    Details
    ISSN: 0887-6134
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The supernatants of Vero cell cultures after infection with a herpes simplex virus or a poliomyelitis virus as well as a blank were analysed by pyrolysis/direct chemical ionization mass spectrometry (Py/DCI MS). Informative pyrogrammes were obtained and used for characterization of viral proteins by applying pattern recognition methods. Differentiation of viral proteins was evaluated by analysing ‘blind’ samples. Herpes viruses could be classified correctly but the observed differences between the blank and the polio virus supernatants were too small for reliable classification of the polio viruses. Purification of the samples seems to be a prerequisite for further studies. The potential value of Py/DCI MS as a rapid non-invasive diagnostic method for viral meningoencephalitis is stressed.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200180919
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  • 4
    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
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