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http://hdl.handle.net/10773/20255
Title: | Fractality and metastability of a complex amide cross-linked dipodal alkyl/siloxane hybrid |
Author: | Nunes, S. C. Ferreira, C. B. Ferreira, R. A. S. Carlos, L. D. Ferro, M. C. Mano, J. F. Almeida, P. Bermudez, V. de Zea |
Keywords: | ORGANIC-INORGANIC HYBRIDS BRIDGED SILSESQUIOXANES ALKYL CHAINS LAMELLAR STRUCTURE QUANTUM YIELDS LIGHT EMISSION MONOLAYERS SILICA PHOTOLUMINESCENCE CONFORMATION |
Issue Date: | 2014 |
Publisher: | ROYAL SOC CHEMISTRY |
Abstract: | A novel room-temperature white light emitter amide-cross linked alkyl/siloxane hybrid material (amidosil A) was produced by self-organization through the rational design of the precursor. This hybrid displays a highly complex hierarchical architecture composed of two lamellar bilayer structures, the relative spatial arrangement of which yields a multiplicity of ordered nanodomains with variable shapes and sizes, some of them persisting at the microscale. Macroscopically A was obtained as clusters of hydrophobic hemispherical and spherical micro-objects exhibiting a lettuce coral-like pattern, which represent unprecedented pieces of evidence illustrating the principles of self-similarity and demonstrating that the time scale of biomimetic morphogenesis in this non-bridged silsesquioxane is similar to that in biological systems. Heating metastable A above the order/disorder phase transition acted as an external quake driving the material to another metastable state, which has persisted for more than 12 months, and was manifested as a marked change of all the macroscopic properties. The occurrence of the self-organization process operating on A, instead of a self-directed assembly, is primarily associated with the formation/rupture of hydrogen bonds, therefore supporting that these interactions are critical factors dictating on what side of the self-assembly/self-organization boundary a non-bridged silsesquioxane system will evolve. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20255 |
DOI: | 10.1039/c4ra11300d |
ISSN: | 2046-2069 |
Publisher Version: | 10.1039/c4ra11300d |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Fractality and metastability of a complex amide cross-linked dipodal alkylsiloxane hybrid_10.1039c4ra11300d.pdf | 6.01 MB | Adobe PDF | View/Open |
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