Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/60931
Título: | Luminescent κ-Carrageenan-Based Electrolytes Containing Neodymium Triflate |
Autor(es): | Nunes, S. C. Saraiva, S. M. Pereira, Rui Francisco Gonçalves Pinto Fernandes Silva, Maria Manuela Carlos, L. D. Almeida, P. Gonçalves, M. C. Ferreira, R. A. S. Bermudez, V. de Zea |
Palavras-chave: | kappa-carrageenan structure biopolymer electrolyte thermal properties ionic conductivity luminescence features κ-carrageenan |
Data: | 14-Mar-2019 |
Editora: | Multidisciplinary Digital Publishing Institute |
Revista: | Molecules |
Resumo(s): | In recent years, the synthesis of polymer electrolyte systems derived from biopolymers for the development of sustainable green electrochemical devices has attracted great attention. Here electrolytes based on the red seaweeds-derived polysaccharide κ-carrageenan (κ-Cg) doped with neodymium triflate (NdTrif<sub>3</sub>) and glycerol (Gly) were obtained by means of a simple, clean, fast, and low-cost procedure. The aim was to produce near-infrared (NIR)-emitting materials with improved thermal and mechanical properties, and enhanced ionic conductivity. Cg has a particular interest, due to the fact that it is a renewable, cost-effective natural polymer and has the ability of gelling in the presence of certain alkali- and alkaline-earth metal cations, being good candidates as host matrices for accommodating guest cations. The as-synthesised κ-Cg-based membranes are semi-crystalline, reveal essentially a homogeneous texture, and exhibit ionic conductivity values 1–2 orders of magnitude higher than those of the κ-Cg matrix. A maximum ionic conductivity was achieved for 50 wt.% Gly/κ-Cg and 20 wt.% NdTrif<sub>3</sub>/κ-Cg (1.03 × 10<sup>−4</sup>, 3.03 × 10<sup>−4</sup>, and 1.69 × 10<sup>−4</sup> S cm<sup>−1</sup> at 30, 60, and 97 °C, respectively). The NdTrif-based κ-Cg membranes are multi-wavelength emitters from the ultraviolet (UV)/visible to the NIR regions, due to the κ-Cg intrinsic emission and to Nd<sup>3+</sup>, <sup>4</sup>F<sub>3/2</sub>→<sup>4</sup>I<sub>11/2-9/2</sub>. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/60931 |
DOI: | 10.3390/molecules24061020 |
ISSN: | 1420-3049 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDQuim - Artigos (Papers) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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molecules-24-01020.pdf | 3,77 MB | Adobe PDF | Ver/Abrir |
Este trabalho está licenciado sob uma Licença Creative Commons