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http://hdl.handle.net/10773/20829
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DC Field | Value | Language |
---|---|---|
dc.contributor.author | Freitas, Vania T. | pt |
dc.contributor.author | Lima, P. P. | pt |
dc.contributor.author | Ferreira, R. A. S. | pt |
dc.contributor.author | Carlos, L. D. | pt |
dc.contributor.author | Pecoraro, E. | pt |
dc.contributor.author | Ribeiro, S. J. L. | pt |
dc.contributor.author | de Zea Bermudez, V. | pt |
dc.date.accessioned | 2017-12-07T20:00:54Z | - |
dc.date.issued | 2014 | pt |
dc.identifier.issn | 0928-0707 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/20829 | - |
dc.description.abstract | Transparent monoliths and films of urea cross-linked tripodal siloxane-based hybrids (named tri-ureasils) were prepared by the sol-gel process, under controlled atmosphere (inside a glove box) and ambient conditions and their structure and optical features were compared. X-ray diffraction data point out that all the materials are essentially amorphous and Si-29 NMR reveal an increase in the condensation degree (0.97) for the hybrids prepared under controlled atmosphere relatively to that found for those prepared under ambient conditions (0.84-0.91). The tri-ureasils are white light emitters under UV/Visible excitation (from 250 to 453 nm) being observed for the composites prepared inside the glove box a significant enhancement (60-80 %) of the absorption coefficient and higher emission quantum yield values (similar to 0.27 and similar to 0.20 for monoliths and films, respectively) relatively to those synthesized under ambient condition. | pt |
dc.language.iso | eng | pt |
dc.publisher | SPRINGER | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/101324/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/112774/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | ORGANIC-INORGANIC NANOCOMPOSITES | pt |
dc.subject | CARBOXYLIC-ACID SOLVOLYSIS | pt |
dc.subject | METAL ACTIVATOR IONS | pt |
dc.subject | BRIDGED SILSESQUIOXANES | pt |
dc.subject | ORGANIC/INORGANIC HYBRIDS | pt |
dc.subject | LIGHT-EMISSION | pt |
dc.subject | TUNABLE PHOTOLUMINESCENCE | pt |
dc.subject | LAMELLAR STRUCTURE | pt |
dc.subject | ENERGY-TRANSFER | pt |
dc.subject | SILICA SPHERES | pt |
dc.title | Role of the reactive atmosphere during the sol-gel synthesis on the enhancing of the emission quantum yield of urea cross-linked tripodal siloxane-based hybrids | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 227 | pt |
degois.publication.issue | 2 | pt |
degois.publication.lastPage | 235 | pt |
degois.publication.title | JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | pt |
degois.publication.volume | 70 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1007/s10971-013-3244-x | pt |
dc.identifier.doi | 10.1007/s10971-013-3244-x | pt |
Appears in Collections: | CICECO - Artigos |
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