| Texto completo | |
| Autor(es): |
Caliman, Willian Robert
;
Sentanin, Franciani Cassia
;
Sabadini, Rodrigo Cesar
;
Donoso, Jose Pedro
;
Magon, Claudio Jose
;
Pawlicka, Agnieszka
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Molecules; v. 27, n. 24, p. 19-pg., 2022-12-01. |
| Resumo | |
Nanocomposite polymer electrolytes (NPEs) were obtained using gellan gum (GG) and 1 to 40 wt.% of montmorillonite (Na+SYN-1) clay. The NPEs were crosslinked with formaldehyde, plasticized with glycerol, and contained LiClO4. The samples were characterized by impedance spectroscopy, thermal analyses (TGA and DSC), UV-vis transmittance and reflectance, X-ray diffraction (XRD), and continuous-wave electron paramagnetic resonance (CW-EPR). The NPEs of GG and 40 wt.% LiClO4 showed the highest conductivity of 2.14 x 10(-6) and 3.10 x 10(-4) S/cm at 30 and 80 degrees C, respectively. The samples with 10 wt.% Na+SYN-1 had a conductivity of 1.86 x 10(-5) and 3.74 x 10(-4) S/cm at 30 and 80 degrees C, respectively. TGA analyses revealed that the samples are thermally stable up to 190 degrees C and this did not change with clay addition. The transparency of the samples decreased with the increase in the clay content and at the same time their reflectance increased. Finally, CW-EPR was performed to identify the coordination environment of Cu2+ ions in the GG NPEs. The samples doped with the lowest copper concentration exhibit the typical EPR spectra due to isolated Cu2+ ions in axially distorted sites. At high concentrations, the spectra become isotropic because of dipolar and exchange magnetic effects. In summary, GG/clay NPEs presented good ionic conductivity results, which qualifies them for electrochemical device applications. (AU) | |
| Processo FAPESP: | 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros |
| Beneficiário: | Edgar Dutra Zanotto |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |