Silicon-29 cross-polarization/magic-angle-spinning NMR study of inorganic-organic hybrids

Homogeneity of sol-gel derived hybrid gels

Yoshihiko Komori, Hiroshi Nakashima, Shigenobu Hayashi, Yoshiyuki Sugahara

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    The structures of sol-gel derived hybrid gels prepared by co-hydrolysis of tetraethoxysilane (TEOS)-organotrialkoxysilane (RTES, RSi(OC2H 5)3, R = CH3, C5H11, C8H17 and C6H5) mixtures (TEOS:RTES:CH3CH2OH:H2O:HNO3 = 0.5:0.5:10:x:0.3; x = 2, 5, 10 and 20) were characterized based on signal intensities of 29Si CP/MAS NMR as a function of the contact time. The contact time dependencies of the signals for Q4 (Si(OSi) 4) units were successfully simulated by assuming distributed cross relaxation times (TSiH) and an intrinsic 1H spin-lattice relaxation time in the rotating frame (T H); the latter was different from the apparent T H value estimated by assuming single TSiH. The distribution ranges of T SiH for the TEOS-RTES gels broadened as the water content increased, suggesting that the Q4 units tended to be separated from the T units and that the local concentration of 1H spins around the Q4 unit tended to decrease.

    Original languageEnglish
    Pages (from-to)97-103
    Number of pages7
    JournalJournal of Non-Crystalline Solids
    Volume351
    Issue number2
    DOIs
    Publication statusPublished - 2005

    Fingerprint

    Magic angle spinning
    cross polarization
    Silicon
    metal spinning
    homogeneity
    Sol-gels
    Gels
    Nuclear magnetic resonance
    gels
    Polarization
    Relaxation time
    nuclear magnetic resonance
    silicon
    Polymers
    relaxation time
    cross relaxation
    Spin-lattice relaxation
    spin-lattice relaxation
    Water content
    moisture content

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Electronic, Optical and Magnetic Materials

    Cite this

    Silicon-29 cross-polarization/magic-angle-spinning NMR study of inorganic-organic hybrids : Homogeneity of sol-gel derived hybrid gels. / Komori, Yoshihiko; Nakashima, Hiroshi; Hayashi, Shigenobu; Sugahara, Yoshiyuki.

    In: Journal of Non-Crystalline Solids, Vol. 351, No. 2, 2005, p. 97-103.

    Research output: Contribution to journalArticle

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