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https://hdl.handle.net/1822/50363
Título: | Ion conducting and paramagnetic d-PCL(530)/siloxane-based biohybrids doped with Mn 2+ ions |
Autor(es): | Pereira, Rui Francisco Gonçalves Pinto Fernandes Donoso, J. P. Magon, C. J. Silva, I. D. A. Cardoso, M. A. Gonçalves, M. C. Sabadini, R. C. Pawlicka, A. Zea Bermudez, V. de Silva, Maria Manuela |
Palavras-chave: | Poly(e-caprolactone)/siloxane biohybrids Manganese perchlorate Sol-gel Ionic conductivity Paramagnetism |
Data: | 18-Jun-2016 |
Editora: | Elsevier |
Revista: | Electrochimica Acta |
Resumo(s): | Amorphous α,ω-hidroxylpoly(ε-caprolactone) (PCL(530))/siloxane ormolytes doped with manganese perchlorate (Mn(ClO4)2) (d-PCL(530)/siloxanenMn(ClO4)2) with n = 20, 50, and 100), thermally stable up to at least 200 ºC, were synthesized by the sol-gel method. Ionic conductivity values up to 4.8×10−8 and 2.0×10−6 S cm−1 at about 25 and 100 ºC, respectively, where obtained for n = 20. FT-IR data demonstrated that the hydrogen bonding interactions present in the non-doped d-PCL(530)/siloxane host hybrid matrix were significantly influenced by the inclusion of Mn(ClO4)2 which promoted the formation of more oxyethylene/urethane and urethane/urethane aggregates. In addition, the Mn2+ ions bonded to all the “free” C=O groups of the urethane cross-links and to some of the “free” ester groups of the amorphous PCL(530) chains. In the electrolytes, the ClO4 − ions were found “free” and bonded to the Mn2+ ions along a bidentate configuration. The magnitude of the electron paramagnetic resonance (EPR) hyperfine constant of the analyzed samples (A ≈ 90×10-4 cm−1 ) suggested that the bonding between Mn2+ ions and the surrounding ligands is moderately ionic. The synthetized d-PCL(530)/siloxanenMn(ClO4)2 biohybrids have potential application in paramagnetic, photoelectrochemical and electrochromic devices. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/50363 |
DOI: | 10.1016/j.electacta.2016.06.088 |
ISSN: | 0013-4686 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDQuim - Artigos (Papers) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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EA R. Pereira et al.pdf | 1,2 MB | Adobe PDF | Ver/Abrir |