Layer-by-layer (LBL) self-assembly method was used to fabricate siliceous ultrathin films by using polyhedral oligomeric silsesquioxanes as building blocks. Ammonium salt of octasilsesquioxane acid (OSi8) and poly(dia...Layer-by-layer (LBL) self-assembly method was used to fabricate siliceous ultrathin films by using polyhedral oligomeric silsesquioxanes as building blocks. Ammonium salt of octasilsesquioxane acid (OSi8) and poly(diallyldimethylammonium chloride) (PDDA) were alternately assembled onto CaF2 slide to form nanocomposite multilayers. Linear build-up of the LBL films was confirmed by UV-Vis spectroscopy. IR spectrum suggests existence of OSi8 and PDDA in the LBL films. Atomic force microscopic surface topography of the LBL films indicates the OSi8 covers the entire surface of the topmost layer and shows a granular morphology.展开更多
The synthesis and characterization of Zr-POSS and Hf-POSS coordination polymers were reported. The IR data and the solid-state 29Si MAS NMR indicated the existence of Si--O--M linkage. The polarized optical microscopy...The synthesis and characterization of Zr-POSS and Hf-POSS coordination polymers were reported. The IR data and the solid-state 29Si MAS NMR indicated the existence of Si--O--M linkage. The polarized optical microscopy images and the XRD data suggested their crystalline nature.展开更多
文摘Layer-by-layer (LBL) self-assembly method was used to fabricate siliceous ultrathin films by using polyhedral oligomeric silsesquioxanes as building blocks. Ammonium salt of octasilsesquioxane acid (OSi8) and poly(diallyldimethylammonium chloride) (PDDA) were alternately assembled onto CaF2 slide to form nanocomposite multilayers. Linear build-up of the LBL films was confirmed by UV-Vis spectroscopy. IR spectrum suggests existence of OSi8 and PDDA in the LBL films. Atomic force microscopic surface topography of the LBL films indicates the OSi8 covers the entire surface of the topmost layer and shows a granular morphology.
基金This work was supported by the National Natural Science Foundation of China-NSAF （No. 10976020）, and the Science and Technology Development Founda- tion of China Academy of Engineering Physics （No. 2009A0302021）.
文摘The synthesis and characterization of Zr-POSS and Hf-POSS coordination polymers were reported. The IR data and the solid-state 29Si MAS NMR indicated the existence of Si--O--M linkage. The polarized optical microscopy images and the XRD data suggested their crystalline nature.
