Transformation of layered docosyltrimethyl- and docosyltriethylammonium silicates derived from kanemite into precursors for ordered mesoporous silicas

Tatsuo Kimura, Daigo Itoh, Tetsuro Shigeno, Kazuyuki Kuroda*

*この研究の対応する著者

研究成果: Article査読

21 被引用数 (Scopus)

抄録

The transformation of layered silicate-surfactant materials derived from a layered polysilicate kanemite into precursors for ordered mesoporous silicas was investigated. When kanemite was allowed to react with docosyltrimethylammonium (C22TMA) and docosyltriethylammonium (C22TEA) surfactants, layered C22-TMA- and C22TEA-silicate materials were formed. The 29Si MAS NMR spectra of the layered intermediates clearly indicated that fragmented silicate sheets were present in the silicate-surfactant materials. These layered materials can be transformed by acid treatment into mesostructured precursors with three-dimensional (3-d) silicate networks that afford uniform mesopores after the removal of the surfactants. Ordered mesoporous silica with a 2-d hexagonal structure (FSM-16) can be obtained by using C22TEA with a larger headgroup. The results here successfully support the proposed formation mechanism of FSM-16, which consists of assembling of fragmented layered silicate sheets with surfactants and the subsequent structural transformation to the 2-d hexagonal mesophase.

本文言語English
ページ(範囲)9574-9577
ページ数4
ジャーナルLangmuir
18
24
DOI
出版ステータスPublished - 2002 11 26

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 表面および界面
  • 分光学
  • 電気化学

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