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Molecules 2019, 24(6), 1020; https://doi.org/10.3390/molecules24061020

Luminescent κ-Carrageenan-Based Electrolytes Containing Neodymium Triflate

1
Chemistry Department, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal
2
Chemistry Department, University of Beira Interior, 6201-001 Covilhã, Portugal
3
Chemistry Department, University of Minho, 4710-057 Braga, Portugal
4
Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal
5
CICS-UBI, University of Beira Interior, 6201-001 Covilhã, Portugal
6
CQ-VR, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal
*
Authors to whom correspondence should be addressed.
Received: 13 February 2019 / Revised: 6 March 2019 / Accepted: 8 March 2019 / Published: 14 March 2019
(This article belongs to the Special Issue Lanthanides: New Trends and Applications)
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Abstract

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 (NdTrif3) 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.% NdTrif3/κ-Cg (1.03 × 10−4, 3.03 × 10−4, and 1.69 × 10−4 S cm−1 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 Nd3+, 4F3/24I11/2-9/2. View Full-Text
Keywords: κ-carrageenan; structure; biopolymer electrolyte; thermal properties; ionic conductivity; luminescence features κ-carrageenan; structure; biopolymer electrolyte; thermal properties; ionic conductivity; luminescence features
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Nunes, S.C.; Saraiva, S.M.; Pereira, R.F.P.; Silva, M.M.; Carlos, L.D.; Almeida, P.; Gonçalves, M.C.; Ferreira, R.A.S.; Bermudez, V.Z. Luminescent κ-Carrageenan-Based Electrolytes Containing Neodymium Triflate. Molecules 2019, 24, 1020.

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