You are here: Home :: Area NEM :: Chemistry :: Inorganic chemistry

Yoshiro Kaneko, Nobuo Iyi

Sol-gel synthesis of rodlike polysilsesquioxanes forming regular higher-ordered nanostructure

Keywords: Sol-gel synthesis, Polysilsesquioxane, Polysiloxane, Silica, Higher-ordered nanostructure

Rodlike polysilsesquioxanes forming regular higher-ordered nanostructure such as hexagonal phase were prepared by sol-gel reaction of organotrimethoxysilanes having amino groups in aqueous solutions of inorganic strong acids. The XRD profiles of the resulting polysilsesquioxanes showed three peaks with the d-value ratio of 1 : 1/√3 : 1/ 2, indicating that these polysilsesquioxanes have hexagonal phase. The diffraction peaks shifted by changing the humidity. In addition, the d-values of diffraction peaks increased by ion-exchange reaction with organic compounds such as fatty acid salt and anionic polymer. Therefore, this hexagonal phase originated from the stacking of rodlike polysilsesquioxanes with Si–O–Si framework at the core and ammonium groups extruding outside. This Si–O–Si framework probably formed a ladder or ladder-related structure, which was characterized by solid-state ²⁹Si NMR and IR spectrometries.

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 222, 11/2007
Pages: 656 - 662

Show full article (external site)

Show all available items of this journal

 

Area NEM