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TitleStudy of sol-gel derived di-ureasils doped with zinc triflate
Author(s)Nunes, Sílvia
Zea Bermudez, V. de
Silva, Maria Manuela
Smith, Michael John
Morales, Enrique
Ferreira, R. A. Sá
Carlos, Luís
Rocha, João
KeywordsIonic conductivity
Zinc triflate
Issue date1-Sep-2006
PublisherElsevier Science BV
JournalSolid State Sciences
Abstract(s)Zinc triflate (Zn(CF3SO3)2)-doped sol-gel derived di-urea cross-linked POE/siloxane ormolytes (designated as di-ureasils) with ∞ > n ≥ 1 (where the salt content is expressed as n, the molar ratio of oxyethylene moieties to Zn2+ ions) were investigated. The hybrids with n ≥ 5 are entirely amorphous; those with n > 10 are thermally stable up to approximately 305 ºC. The siliceous network of representative samples (n = 200 and 10) is essentially composed of (SiO)3Si(CH2)- environments and is thus highly branched. The distance between the structural units in samples with 200 ≥ n ≥ 10 and n ≤ 7 is 4.2 and 4.3 Å, respectively. The estimated interdomain distance is 11 and 13 Å for xerogels with 200 ≥ n ≥ 20 and n ≤ 10, respectively. At n = 1 a crystalline POE/Zn(CF3SO3)2 complex of unknown stoichiometry is formed. The conductivity maxima are located at n = 60 (3x10-6 S cm-1) and n = 20 (7x10-5 S cm-1) at 30 and 100 ºC, respectively.
DescriptionProva tipográfica (In Press)
A publicar em "Solid States Sciences".
AccessOpen access
Appears in Collections:CDQuim - Artigos (Papers)

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