PWA-diureasils organic-inorganic hybrids: photochromism and effect of the organic chain length

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorObara, P. A.
dc.creatorSarmento, V. H. V.
dc.creatorRibeiro, S. J. L.
dc.creatorNalin, M.
dc.creatorMolina, C.
dc.date2015-10-21T20:23:46Z
dc.date2016-10-25T21:08:24Z
dc.date2015-10-21T20:23:46Z
dc.date2016-10-25T21:08:24Z
dc.date2015-08-01
dc.date.accessioned2017-04-06T09:07:05Z
dc.date.available2017-04-06T09:07:05Z
dc.identifierOptical Materials, v. 46, p. 64-69, 2015.
dc.identifier0925-3467
dc.identifierhttp://hdl.handle.net/11449/129116
dc.identifierhttp://acervodigital.unesp.br/handle/11449/129116
dc.identifierhttp://dx.doi.org/10.1016/j.optmat.2015.03.054
dc.identifierWOS:000357350700012
dc.identifierhttp://www.sciencedirect.com/science/article/pii/S0925346715002128
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/939671
dc.descriptionDi-ureasil organic-inorganic hybrids have been used together with Phosphotungstic acid (PWA- H3PW12O40) in the preparation of new photochromic materials. PWA was incorporated in different relative concentrations in di-ureasils displaying different organic chain lengths. The structure and photochromic behaviour of these novel material were investigated by means of infrared (FTIR), photoluminescence (PL) and Ultraviolet-Visible (UV-Vis) spectroscopies and Small Angle X-ray Scattering (SAXS) technique as a function of PWA content and also of the polymer chain length. Eu3+ has been incorporated as probe ion. For the short polymer chains, europium and PWA keggin structures are located close to oxygen in the ether type of the polyoxides segments and for the long polymer chain carbonyl groups of the urea units were observed to contribute in the coordination. Moreover, the photochromic effect was followed by UV-Vis measurements which showed that in both hybrid families changing from colorless to blue after UV exposure, and the bleaching process, depend directly on the polymer chain length and the nature of the sites where PWA are coordinated in the matrix. (C) 2015 Elsevier B.V. All rights reserved.
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.languageeng
dc.publisherElsevier B.V.
dc.relationOptical Materials
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectPhotochromic
dc.subjectSol-gel
dc.subjectHybrids
dc.subjectDi-ureasils
dc.titlePWA-diureasils organic-inorganic hybrids: photochromism and effect of the organic chain length
dc.typeOtro


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