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Chitosan polymer electrolytes doped with a dysprosium ionic liquid
Leones, Rita Daniela Barros; Reis, P. M.; Sabadini, R. C.; Esperanca, J. M. S. S.; Pawlicka, A.; Silva, Maria ManuelaIn this work, we studied polymer electrolytes (PEs) that had the natural polymer chitosan as their matrix host. Different quantities of an ionic liquid that contains the lanthanide dysprosium as part of the anion, were incorporated in the chitosan matrix through the solvent casting method. The thermal, morphological and electrochemical properties of the membranes were accessed. The results, obtained by thermogr...
Playing with ionic liquids to uncover novel solid polymer electrolytes
Leones, Rita Daniela Barros; Sabadini, Rodrigo C.; Esperança, J. M. S. S.; Pawlicka, Agnieszka; Silva, Maria ManuelaSolid polymer electrolytes (SPEs) based on chitosan and fourteen ionic liquids (ILs) were synthesized by solvent casting method. All ILs had in common a 1-ethyl-3-methylimidazolium cation ([C2mim]+). Therefore, this study focuses on the influence of the anion on the thermal, morphological, and electrochemical properties of the SPEs. The samples were analyzed by thermogravimetric analysis (TGA), differential sca...
Polymer electrolytes for electrochromic devices through solvent casting and sol...
Leones, Rita Daniela Barros; Sabadini, R. C.; Sentanin, F.; Esperança, J. M. S. S.; Pawlicka, Agnieszka; Silva, Maria ManuelaIonically conductive membranes of gelatin and d-PCL(530)/siloxane doped with cyano-based ionic liquids (ILs) were prepared through solvent casting and sol-gel methods, respectively. The membranes were characterized in terms of ionic conductivity, thermal behavior, morphology, and structure. All samples, except the d-PCL(530)/siloxane matrix, exhibited a predominantly amorphous morphology. The samples prepared t...
Effect of storage time on the ionic conductivity of chitosan-solid polymer elec...
Leones, Rita Daniela Barros; Sabadini, R. C.; Esperança, J. M. S. S.; Pawlicka, A.; Silva, Maria ManuelaFour solid polymer electrolytes (SPEs) of chitosan-based host matrix were prepared by solvent casting method. The SPEs incorporated 1-ethyl-3-methylimidazolium thiocyanate ([C2mim][SCN]), 1-ethyl-3- methylimidazolium dicyanamide ([C2mim][N(CN)2]), 1-ethyl-3-methylimidazolium tricyanomethanide ([C2mim][C(CN)3]), and 1-butyl-3-methylimidazolium thiocyanate ([C4mim][SCN]). The structure, morphology, thermal behavi...
A luminescent europium ionic liquid to improve the performance of chitosan poly...
Leones, Rita Daniela Barros; Reis, P. M.; Sabadini, R. C.; Ravaro, Leandro P.; Silva, I. D. A.; Camargo, Andrea S. S. de; Donoso, J. P.; Magon, C. J.Ionically conductive and luminescent chitosan solid polymer electrolytes (SPEs) were prepared through the solvent casting method and characterized with respect to their thermal behavior, morphology, structure, ionic conductivity, optical, and photophysical properties. The characterization was performed by analysis of differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (X...
Eco-friendly sol-gel derived sodium-based ormolytes for electrochromic devices
Fernandes, M.; Leones, Rita Daniela Barros; Pereira, S.; Costa, A. M. S.; Mano, J. F.; Silva, Maria Manuela; Fortunato, E.; de Zea Bermudez, V.The sol-gel method was employed in the preparation of a novel range of organicinorganic biohybrid electrolytes composed of a di-urethane cross-linked poly(ε- caprolactone) (PCL(530) chains/siloxane doped with different amounts of sodium triflate (NaCF3SO3.xH2O). The samples are semi-crystalline and thermally stable up to ca. 250 ºC. The maximum ionic conductivity (4.1 × 10-7 , 1.5 × 10-4 and 8.8 × 10-4 S cm-1 a...
Prussian blue for electrochromic devices
Assis, L.M.N.; Leones, Rita Daniela Barros; Kanicki, J.; Pawlicka, A.; Silva, Maria ManuelaAll solid electrochromic devices (ECDs) were prepared using Prussian blue (PB) as electrochromic layer, CeO2 -TiO2 as counter electrode, and either DNA-Er(CF3SO3)3 or Agar-Eu(CF3SO3)3 as ionic conductive membrane. The ECDs were assembled by combining the natural macromolecule-based electrolyte membrane placed between the glass-ITO/PB and CeO2-TiO2/ITO-glass electrodes. The two kind of electrochromic devices wer...
Di-ureasil hybrid electrolytes incorporating a new proton ionic liquid
Cardoso, Marita A.; Leones, Rita Daniela Barros; Rodrigues, Luísa Cidália Guimarães; Fernandes, Mariana; Figueiredo, Filipe L.; Nunes, Sílvia C.The protic ionic liquid (PIL) N-butylimidazolium trifluoromethanesulfonate ([BIm][TfO]) was obtained for the first time and incorporated into a sol-gel derived di-ureasil matrix with a concentration of X = 5, 10 and 30 %, where X is the ratio of the mass of PIL per mass of poly(oxyethylene) (POE). Four years after their synthesis, the resulting quasi-anhydrous electrolytes remained amorphous, homogeneous, flexi...
Effect of the alkyl chain length of the ionic liquid anion on polymer electroly...
Leones, Rita Daniela Barros; Sentanin, Franciani; Nunes, Sílvia Cristina; Esperança, J. M. S. S.; Gonçalves, Maria Cristina; Pawlicka, AgnieskaNew polymer electrolytes (PEs) based on chitosan and three ionic liquid (IL) families ([C2mim][CnSO3], [C2mim][CnSO4] and [C2mim][diCnPO4]) were synthesized by the solvent casting method. The effect of the length of the alkyl chain of the IL anion on the thermal, morphological and electrochemical properties of the PEs was studied. The solid polymer electrolytes (SPE) membranes were analyzed by differential scan...
Electrochromic devices incorporating biohybrid electrolytes doped with a lithiu...
Fernandes, M.; Leones, Rita Daniela Barros; Costa, A. M. S.; Silva, Maria Manuela; Pereira, S.; Mano, J. F.; Fortunato, E.; Rego, R.The sol-gel method was employed in the synthesis of di-urethane cross-linked poly( caprolactone) (PCL(530)/siloxane biohybrid ormolytes incorporating either a mixture of lithium triflate (LiCF3SO3) and the ionic liquid (IL) 1-ethyl-3-methyl imidazolium tetrafluoroborate ([Emim]BF4), or solely with [Emim]BF4 or LiCF3SO3. The ormolyte doped with [Emim]BF4 is thermally more stable and exhibits higher ionic conduc...