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http://hdl.handle.net/10773/19191
Title: | Nanostructuring of Bridged Organosilane Precursors with Pendant Alkyl Chains |
Author: | Nunes, Silvia C. Buerglova, Kristyna Hodacova, Jana Ferreira, Rute A. S. Carlos, Luis D. Almeida, Paulo Cattoen, Xavier Man, Michel Wong Chi Bermudez, Veronica de Zea |
Keywords: | H STRETCHING MODES SOLID-STATE NMR HYBRIDS CONFORMATION MONOLAYERS SILSESQUIOXANES SPECTROSCOPY HYDROLYSIS SILICATES MOBILITY |
Issue Date: | 2015 |
Publisher: | WILEY-V C H VERLAG GMBH |
Abstract: | The copper-catalyzed alkyne azide cycloaddition (CuAAC) reaction was combined with sol-gel reactions for the production of bridged silsesquioxanes (BSs) in which hexyl and icosanyl chains are pendant and anchored on a single position to a triazole ring. The influence of the alkyl chain length on the structure of the BSs, represented by the notation Cn/siloxane (where n = 6 and 20), was examined. The C20/siloxane hybrid is a hydrophobic material that exhibits a hierarchically structured lamellar bilayer organization, a texture composed of microplates of nanometer thickness, and a reversible time-independent order/disorder phase transition (onset at 60 degrees C). The driving forces for self-assembly are van der Waals interactions between the icosanyl chains and - interactions between the triazole rings. In the essentially amorphous C6/siloxane hybrid, the latter contribution promotes the genesis of a pre-lamellar phase similar to that found in C20/siloxane. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19191 |
DOI: | 10.1002/ejic.201402673 |
ISSN: | 1434-1948 |
Publisher Version: | 10.1002/ejic.201402673 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Nanostructuring of Bridged Organosilane Precursors with Pendant Alkyl Chains_10.1002ejic.201402673.pdf | 4.84 MB | Adobe PDF |
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