Organogels are useful as a template for the preparation of novel helical silica fibers

Yoshiyuki Ono, Kazuaki Nakashima, Masahito Sano, Junichi Hojo, Seiji Shinkai, Seiji Shinkai, Seiji Shinkai

研究成果: Contribution to journalArticle査読

89 被引用数 (Scopus)

抄録

Sol-gel polymerization of tetraethoxysilane (TEOS) was carried out in the organogel phase consisting of cholesterol-based gelators (neutral 1 and cationic 2). TEOS polymerization in neutral 1 + MeCO2H gel resulted in the conventional granular silica whereas that in cationic 2 + MeCO2H gel yielded the novel mesoporous silica with a tubular structure. SEM and TEM observations and additive effects established that the organogel fibers act as a template in the TEOS polymerization process to yield the hollow silica fibers and that the electrostatic interaction plays a crucial role in adsorption of anionic oligomeric silica particles onto the cationic organogel fiber surface. Thus, the tubular structure is created after combustion of the gelators by calcination. Very interestingly, when TEOS polymerization was carried out in the 1 + 2 mixed organogel, fibrous silica with a right-handed "helical" structure was created. This phenomenon appeared only in the range of 2/(1 + 2) = 5-15 mol%. Since the higher-order helical structure is characteristic of supramolecular assemblies of "chiral" organic compounds, it is suggested that the chirality in the organogel fibers is successfully transcribed into the inorganic silica fibers. Thus, the concept presented in this paper describes a novel template effect and should be broadly applicable to the design of "supramolecular" silica materials useful for catalysts, memory storage, replication, etc.

本文言語英語
ページ(範囲)2412-2419
ページ数8
ジャーナルJournal of Materials Chemistry
11
10
DOI
出版ステータス出版済み - 1 1 2001
外部発表はい

All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 材料化学

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