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*

*この研究の対応する著者

研究成果: Article査読

18 被引用数 (Scopus)

抄録

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 (TH); the latter was different from the apparent TH 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.

本文言語English
ページ(範囲)97-103
ページ数7
ジャーナルJournal of Non-Crystalline Solids
351
2
DOI
出版ステータスPublished - 2005

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • 凝縮系物理学
  • 材料化学

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