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987 results on '"Lanceros-Méndez, Senentxu"'

20. Fano Resonance in a Defective Network Formed by Helmholtz Resonators with Extended Necks

Author

Malki, Mohamed El, Pereira, Nelson, Lanceros-Mendez, Senentxu, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Motahhir, Saad, editor, and Bossoufi, Badre, editor

Published
2023
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39. Natural and recyclable alginate hydrogels as extracting media for recovering valuable metals of spent lithium-ion batteries from a deep eutectic solvent

Author

Química inorgánica, Kimika ez-organikoa, Wang, Yifeng, Goikolea Núñez, Eider, Ruiz de Larramendi Villanueva, Idoia, Reyes Martín, Efraim, Lanceros Méndez, Senentxu, Zhang, Qi, Química inorgánica, Kimika ez-organikoa, Wang, Yifeng, Goikolea Núñez, Eider, Ruiz de Larramendi Villanueva, Idoia, Reyes Martín, Efraim, Lanceros Méndez, Senentxu, and Zhang, Qi

Abstract

With the aim of achieving carbon neutrality, new policies to promote electric vehicle (EV) deployment have been announced in various countries. As EV sales gain market-share, the demand for batteries is growing very rapidly, and this has raised concerns about the raw-material supply. Therefore, efficient and environmentally friendly recycling methods for lithium-ion batteries (LIBs) are mandatory to properly implement circular economy paradigms in this field. Hydrometallurgical recycling methods are characterized by their selectivity, high product purity as well as low energy consumption. In order to accomplish a close-loop recycling method, in this work we propose the use of a deep eutectic solvent (DES) and alginate hydrogels as leaching reagent and adsorbent, respectively, for their reusability, availability and biodegradability. The solubility and thermal stability of a choline chloride-ethylene glycol based DES (choline chloride: ethylene glycol = 1:2) were investigated, 180 °C being regarded as the temperature threshold for this DES, and reaching up to 1.12 gCo L−1 solubility after 8 h leaching. Moreover, the DES can be reused after the eutectic state recreation with a performance over 80 % with respect to the pristine DES. Calcium cross-linked sodium alginate hydrogels, which were immersed in ethylene glycol and dehydrated afterwards, were able to extract cobalt from the leachate with an efficiency of 92 %. The aforementioned hydrogels can be reused after desorption and reach 91 % of the performance of the pristine ones. The DES together with alginate hydrogel brings therefore a highly efficient and reusable close-loop recycling method.

Published
2025

50. Finite-Size Effects in the Absorption Spectra of a Single-Wall Carbon Nanotube

Author

Silva, Jaime, Oliveira, Micael J T, Lanceros-Mendez, Senentxu, and Nogueira, Fernando

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The determination of the optical spectrum of single-wall carbon nanotubes (SWCNTs) is essential for the development of opto-electronic components and sensors with application in many fields. Real SWCNTs are finite, but almost all the studies performed so far use infinite SWCNTs. However, the spectra of finite and infinite systems are different. In this work the optical spectrum of finite (3,3) and (5,5) SWCNTs is calculated as a function of nanotube length. For the (3,3) SWCNTs, the calculated absorption spectra for light polarised both parallel and perpendicularly to the nanotube axis are in good agreement with experimental results. However, our results indicate that the lowest energy peak present in the experimental results for light polarised parallel to the nanotube axis can be attributed to a surface-plasmon resonance that is a consequence of the finite nature of the SWCNTs and not to the presence of SWCNTs with other chiralities, as claimed by the previous theoretical works. The surface-plasmon resonance is also studied using the Aharonov-Bohm effect. Finally, this work demonstrates that the surface-plasmon resonance in finite SWCNT can be described using a 1D infinite well.

Published
2017
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