Hierarchical porous silica via solid-phase hydrolysis/polycondensation of cubic siloxane-based molecular units

Kenta Iyoki, Ayae Sugawara-Narutaki, Atsushi Shimojima, Tatsuya Okubo*

*この研究の対応する著者

研究成果査読

8 被引用数 (Scopus)

抄録

Hierarchical micro-mesoporous silica has been synthesized by solid-phase conversion of molecular crystals of an alkoxy derivative of a cubic siloxane unit (Si8O12) as a molecular building unit. Seven methoxy groups and one adamantoxy group are introduced in a cage by the reaction of octa(hydridosilsesquioxane) (H8Si8O12) with the corresponding alcohols, which are then eliminated in a step-by-step manner. First, the methoxy groups are hydrolyzed by simply dispersing the precursor powder in an acidic aqueous solution. The formation of Si-O-Si linkages between the cages while retaining the bulky adamantoxy groups is confirmed by solid-state NMR. At this stage, broad mesopores (ca. 2 to 7 nm) are formed, as confirmed by nitrogen adsorption-desorption. The adamantoxy groups are then removed by calcination to generate relatively narrow micropores (∼1 nm in diameter). Various control experiments performed suggest that the stepwise solid-phase reaction of bifunctional building blocks is crucial to the formation of such micro-mesoporous silica, providing a new pathway to nanoporous materials with controlled architectures.

本文言語English
ページ(範囲)671-676
ページ数6
ジャーナルJournal of Materials Chemistry A
1
3
DOI
出版ステータスPublished - 2013 1 21
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 再生可能エネルギー、持続可能性、環境
  • 材料科学(全般)

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