Tetrafluoroborate salts as site-selective promoters for sol-gel synthesis of mesoporous silica

被引：65

作者：

Okabe, A ^{[1
]}

Fukushima, T ^{[1
]}

Ariga, K ^{[1
]}

Niki, M ^{[1
]}

Aida, T ^{[1
]}

机构：

[1] JST, ERATO, Aida Nanosp Project, Koto Ku, Tokyo 1350064, Japan

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2004年 / 126卷 / 29期

关键词：

D O I：

10.1021/ja0478532

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Tetrafluoroborate ion (BF4-) serves as a powerful and better-behaved promoter than fluoride ion (F-) for hydrolytic condensation of alkoxysilanes, such as tetraethoxy orthosilicate, in aqueous media containing amphiphiles with onium ion headgroups as templates, affording thermally and hydrothermally stable mesoporous silica. According to F-19 NMR spectral profiles, BF4- is localized on a positive-charged micellar surface, thereby allowing a site-selective growth of the silica framework. The resulting porous silica has an ordered hexagonal structure with a well-developed and thick silicate wall. Even without calcination, the condensation with BF4- as the promoter progresses to a large extent to furnish a [Si(OSi-)(4)]/([HOSi(OSi-)(3)] + [(HO)(2)Si(OSi-)(2)]) ratio of 6.2, which is greater than that of mesoporous silica formed without BF4- before (1.5) and even after calcination (3.5) to promote thermal condensation in the solid state.

引用

页码：9013 / 9016

页数：4

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