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  • Articles: DFG German National Licenses  (2)
  • Chemistry  (2)
  • 1
    Electronic Resource
    Electronic Resource
    A 13C NMR study of four lignins in the solid and solution states (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2297-2304 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A series of four solvent-extracted lignins were subjected to solid-state 13C NMR analysis using the cross polarization-magic angle (CP/MAS) technique. Comparisons are made between the solid-sample spectra and high-field spectra obtained on solutions of these lignins. Specific signals in both the solid-state and solution spectra can be assigned to structural features present in the lignins. Most of the spectral information present in the solution-state spectra are seen by CP/MAS, a technique that shows great promise for the study of lignin in solid samples.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820819
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Surface characterization of chemically modified (trimethylsily) silicas by 29Si solid state NMR, XPS, and IR photoacoustic spectroscopy (1985)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 7 (1985), S. 196-203 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The surface reactivity of hydroxyl groups on silica with trimethylchlorosilane (TMCS) is examined using XPS, FTIR-PAS, and solid state NMR. All techniques give responses give responses which can be correlated with increasing TMS surface coverages on Lichrosorb Si 60 silica and provide detection limits of ≤10% of a TMS monolayer. Solid state NMR is particularly suited to examining reactivity differences between geminal and single silanols. Geminal hydroxyl groups are found to be much more reactive. At higher TMS coverages approaching steric limitations (0.5 TMS monolayer), nearly 100% of the geminal sites are reacted as opposed to only 20% of the single sites. The reactive subset of single silanols appears to include hydrogen-bonded (vicinal) groups. A mechanism is postulated to explain the apparent enhanced reactivity of geminal and vicinal silanols.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740070407
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    Paper (German National Licenses)
    Fulltext
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