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Title: | Bifunctionalized hybrid silica spheres by hydrolytic cocondensation of 3-aminopropyltriethoxysilane and vinyltriethoxysilane |
Authors: | Bindu, P N Pavithran, C |
Keywords: | Polysilsesquioxanes Aqueous-solution Nanocomposites Mesoporous silicas Controlled-release Methyl silsesquioxane Polyhedral oligomeric silsesquioxane Sol-gel reaction |
Issue Date: | 2010 |
Publisher: | American Chemical Society |
Citation: | Langmuir 26(2):730-735;19 Jan 2010 |
Abstract: | Facile, surfactant free synthetic strategy for bifunctionalized hybrid silica spheres (HS) with structural ordering is presented. HS was prepared by casting and drying of stable siloxane solution from hydrolytic co-condensation of 3-aminopropyltriethoxysilane (AS) and vinyltriethoxysilane (VS) with AS:VS mole ratio of 1:3 in ethanol/water mixture. Spheres of size in the range of 250 nm to 2.5 mu m were produced by adjusting the concentration of reacted siloxane solution using ethanol. Characterization by FTIR, XRD, TGA, and DSC revealed that the HS was formed from coprecipitation of fully condensed polyhedral oligomeric silsesquioxane (POSS) bilayer and incompletely condensed siloxanes (SIL) produced during drying. Formation of POSS bilayer was confirmed by intercalating and stabilizing POSS within a smectite clay and characterizing the modified clay. XRD, FTIR, SEM, and HRTEM of HS heated to 170 degrees C revealed transformation from disordered into ordered lamellar structure of POSS bilayer assembly and siloxane network due to rearrangement and densification of low melting SIL. |
URI: | http://ir.niist.res.in:8080/jspui/handle/123456789/1011 |
ISSN: | 0743-7463 |
Appears in Collections: | 2010 |
Files in This Item:
File | Description | Size | Format | |
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2010_ 0025.pdf Restricted Access | 4.9 MB | Adobe PDF | View/Open Request a copy |
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