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https://hdl.handle.net/1822/15077
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Campo DC | Valor | Idioma |
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dc.contributor.author | Fernandes, Mariana | - |
dc.contributor.author | Barbosa, P. C. | - |
dc.contributor.author | Silva, Maria Manuela | - |
dc.contributor.author | Smith, Michael John | - |
dc.contributor.author | Zea Bermudez, V. de | - |
dc.date.accessioned | 2011-12-12T18:55:14Z | - |
dc.date.available | 2011-12-12T18:55:14Z | - |
dc.date.issued | 2011-06 | - |
dc.identifier.issn | 0254-0584 | por |
dc.identifier.uri | https://hdl.handle.net/1822/15077 | - |
dc.description.abstract | In the present work Fourier Transform infrared and Raman spectroscopy were used to characterize the cation/polymer, cation/cross-link, cation/anion and hydrogen bonding interactions in hybrid electrolytes composed of lithium tetrafluoroborate (LiBF4) and di-urea cross-linked poly(oxyethylene) (POE)/siloxane hybrid networks (di-ureasils) designated as d-(2000) and d-U(600) and incorporating polyether chains with ca. 40.5 and 8.5 oxyethylene repeat units, respectively. Samples with ∞ > n ≥ 2.5 (where n, composition, is the molar ratio of CH2CH2O units per Li+ ion) were analyzed. In both di-ureasil systems over the whole range of salt content examined the Li+ ions bond to the ether oxygen atoms of amorphous POE chains and to BF4- ions forming ion contact pairs. Spectroscopic evidences and SEM images confirm the presence of a crystalline POE/LiBF4 complex of unknown stoichiometry at n < 20 and 25, respectively. Ionic association is particularly important in the case of the d-U(600)-based materials, as a result of the presence of strong hydrogen-bonded aggregates that prevent the establishment of Li+/urea carbonyl oxygen atom interactions. | por |
dc.description.sponsorship | Fundação para a Ciência e a Tecnologia (FCT) | por |
dc.language.iso | eng | por |
dc.publisher | Elsevier 1 | por |
dc.relation | info:eu-repo/grantAgreement/FCT/POCI/59856/PT | - |
dc.rights | openAccess | por |
dc.subject | Di-ureasils | por |
dc.subject | Lithium tetrafluoroborate | por |
dc.subject | FTIR | por |
dc.subject | FT-Raman | por |
dc.title | Di-ureasil hybrids doped with LiBF4 : spectroscopic study of the ionic interactions and hydrogen bonding | por |
dc.type | article | por |
dc.peerreviewed | yes | por |
dc.relation.publisherversion | The original publication is available at www.elsevier.com | por |
sdum.publicationstatus | published | por |
oaire.citationStartPage | 385 | por |
oaire.citationEndPage | 393 | por |
oaire.citationIssue | 1-2 | por |
oaire.citationTitle | Materials Chemistry and Physics | por |
oaire.citationVolume | 129 | por |
dc.identifier.doi | 10.1016/j.matchemphys.2011.04.030 | por |
dc.subject.wos | Science & Technology | por |
sdum.journal | Materials Chemistry and Physics | por |
Aparece nas coleções: | CDQuim - Artigos (Papers) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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MatChemPhys2011.pdf | documento principal | 210,95 kB | Adobe PDF | Ver/Abrir |