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Functional Materials: From Synthesis to Applications
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Functional Materials: From Synthesis to Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Electronic Materials".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 8797

Special Issue Editor

Dr. Antonio Juan Dos Santos-García

E-Mail Website
Guest Editor
Universidad Politécnica de Madrid, Madrid, Spain
Interests: transition metal oxides (TMO); perovskites and related structures; MOFs; magnetic and electric properties; multiferroics, high pressure synthesis; photocatalysis; photoreforming; advanced oxidation processes (AOPs)

Special Issue Information

Dear Colleagues,

We are delighted to announce that article submission to the Special Issue on “Functional materials: from synthesis to applications” is currently open until 15 March 2020. Please find below a brief summary of the scope of this publication:
The rapid development of industrialization and overpopulation is leading to a fast depletion of the natural resources, a growing energy demand, and shortage of fresh water. Therefore, the development of alternative energies, recycle of materials, and wastewater treatment is required to achieve sustainability in our modern society. In order to meet these demands, the search for new materials has become one of the main research topics of Chemistry. The studied materials are usually called functional, in the sense that they have some practical utility derived from their properties in solid state. Such materials have acquired a prominent position in several high-tech areas. For instance, perovskites are widely used for photocatalysis, photovoltaic energy conversion, non-volatile RAM memories, SOFC, superconducting coils, and magnetocaloric devices.
The scope of this Special Issue on “Functional Materials: from Synthesis to Applications” is the synthesis and characterization of transition metal oxides and related materials, which are important for various applications, such as catalysis, photoreforming, wastewater treatment, and production of clean energy. Magnetic, ferroelectric, multiferroic, and superconducting materials are of special interest for the development of more efficient and novel devices.

We look forward to receiving your contributions.

Dr. Antonio Juan Dos Santos-García
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Photocatalysis
  • Photoreforming
  • Advanced Oxidation Processes
  • Li-ion batteries
  • Solid-oxide fuel cells
  • Ferroelectrics
  • Magnetic materials
  • Multiferroics
  • Magnetocaloric effect

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Published Papers (3 papers)

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Research

12 pages, 1581 KiB  
Article
Degradation of Contaminants of Emerging Concern by Electrochemical Oxidation: Coupling of Ultraviolet and Ultrasound Radiations
by María J. Martín de Vidales, Jaime Rua, José Luis Montero de Juan, Francisco Fernández-Martínez and Antonio J. Dos santos-García
Materials 2020, 13(23), 5551; https://doi.org/10.3390/ma13235551 - 5 Dec 2020
Cited by 12 | Viewed by 2043
Abstract
In this work, we study the electrochemical oxidation of methyl red, a dye present in textile industrial effluents, which is selected as the model for the degradation of Contaminants of Emerging Concern. The influence of the initial pollutant concentration (1–5 mg dm−3 [...] Read more.
In this work, we study the electrochemical oxidation of methyl red, a dye present in textile industrial effluents, which is selected as the model for the degradation of Contaminants of Emerging Concern. The influence of the initial pollutant concentration (1–5 mg dm−3), applied current density (2–15 mA cm−2), and the coupling of ultraviolet or ultrasound radiation have been studied using a titanium plate as anode. The results show that electrochemical oxidation is able to efficiently remove methyl red, and the process efficiency decreases with the initial pollutant concentration. At high applied current densities, efficiency drastically decreases due to a less effective mass transfer of the pollutant on the anodic surface. On one hand, the coupling of ultrasound entails an antagonistic effect on the process efficiency, which is probably due to a massive formation of oxidant radicals followed by a fast recombination process. On the other hand, the coupling of ultraviolet radiation increases the process efficiency. Concomitantly to the oxidation processes, titanium electrode produces rising TiO2–anatase nanoparticles, boosting the mineralization process. This new finding sets up a significant improvement over conventional photocatalysis treatments using TiO2–anatase as a catalyst due to synergistic effects coming from the coupling of the electrochemical oxidation and photocatalysis process with Ti anode. Full article
(This article belongs to the Special Issue Functional Materials: From Synthesis to Applications)
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15 pages, 2260 KiB  
Article
Influence of Nanostructuration on PbTe Alloys Synthesized by Arc-Melting
by Javier Gainza, Federico Serrano-Sánchez, Neven Biskup, Norbert Marcel Nemes, José Luis Martínez, María Teresa Fernández-Díaz and José Antonio Alonso
Materials 2019, 12(22), 3783; https://doi.org/10.3390/ma12223783 - 18 Nov 2019
Cited by 9 | Viewed by 2788
Abstract
PbTe-based alloys have the best thermoelectric properties for intermediate temperature applications (500–900 K). We report on the preparation of pristine PbTe and two doped derivatives (Pb0.99Sb0.01Te and Ag0.05Sb0.05Pb0.9Te, so-called LAST18) by a fast [...] Read more.
PbTe-based alloys have the best thermoelectric properties for intermediate temperature applications (500–900 K). We report on the preparation of pristine PbTe and two doped derivatives (Pb0.99Sb0.01Te and Ag0.05Sb0.05Pb0.9Te, so-called LAST18) by a fast arc-melting technique, yielding nanostructured polycrystalline pellets. XRD and neutron powder diffraction (NPD) data assessed the a slight Te deficiency for PbTe, also yielding trends on the displacement factors of the 4a and 4b sites of the cubic Fm-3m space group. Interestingly, SEM analysis shows the conspicuous formation of layers assembled as stackings of nano-sheets, with 20–30 nm thickness. TEM analysis shows intra-sheet nanostructuration on the 50 nm scale in the form of polycrystalline grains. Large numbers of grain boundaries are created by this nanostructuration and this may contribute to reduce the thermal conductivity to a record-low value of 1.6 Wm−1K−1 at room temperature. In LAST18, a positive Seebeck coefficient up to 600 μV K−1 at 450 K was observed, contributing further towards improving potential thermoelectric efficiency. Full article
(This article belongs to the Special Issue Functional Materials: From Synthesis to Applications)
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12 pages, 1407 KiB  
Article
Structural Flexibility in Activated Carbon Materials Prepared under Harsh Activation Conditions
by Fabiano Gomes Ferreira de Paula, Ignacio Campello-Gómez, Paulo Fernando Ribeiro Ortega, Francisco Rodríguez-Reinoso, Manuel Martínez-Escandell and Joaquín Silvestre-Albero
Materials 2019, 12(12), 1988; https://doi.org/10.3390/ma12121988 - 20 Jun 2019
Cited by 21 | Viewed by 3236
Abstract
Although traditionally high-surface area carbon materials have been considered as rigid structures with a disordered three dimensional (3D) network of graphite microdomains associated with a limited electrical conductivity (highly depending on the porous structure and surface chemistry), here we show for the first [...] Read more.
Although traditionally high-surface area carbon materials have been considered as rigid structures with a disordered three dimensional (3D) network of graphite microdomains associated with a limited electrical conductivity (highly depending on the porous structure and surface chemistry), here we show for the first time that this is not the case for activated carbon materials prepared using harsh activation conditions (e.g., KOH activation). In these specific samples a clear structural re-orientation can be observed upon adsorption of different organic molecules, the structural changes giving rise to important changes in the electrical resistivity of the material. Whereas short chain hydrocarbons and their derivatives give rise to an increased resistivity, the contrary occurs for longer-chain hydrocarbons and/or alcohols. The high sensitivity of these high-surface area carbon materials towards these organic molecules opens the gate towards their application for sensing devices. Full article
(This article belongs to the Special Issue Functional Materials: From Synthesis to Applications)
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