Special Issue "Sol-Gel Method Applied to Crystalline Materials"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Hybrid and Composite Crystalline Materials".

Deadline for manuscript submissions: 30 October 2020.

Special Issue Editors

Prof. Dr. Alessandro Dell'Era
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Guest Editor
Department SBAI, Sapienza University of Rome, 00161 Rome, Italy
Interests: energy; batteries and fuel cell; powder electrode materials; nanomaterials; synthesis and caracterization
Special Issues and Collections in MDPI journals
Prof. Dr. Michelina Catauro
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Guest Editor
Department of Engineering, University of Campania “Luigi Vanvitelli”, Via Roma 29, I-81031 Aversa, Italy
Interests: sol–gel technology, biomaterials, bioglass, organic-inorganic hybrid materials, drug delivery,thin films
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

Sol–gel chemistry is a versatile synthesis used to produce modern materials at near-room temperature. Glasses, ceramics, composites, and new hybrid materials that are not easy to obtain using other methods have been, instead, obtained in the last three decades and are widely used today. This technique is used principally for the production of materials by means of a colloidal solution (sol) that operates as a precursor leading to the formation of a 3D inorganic network (gel) of either discrete particles or network polymers. Changing the chemical composition, many parameters of the sol–gel process can be adapted to control the properties and the microstructure of the obtained materials. Sol-gel technology is a multidisciplinary science which allows the expansion of materials for many applications: catalysts, optics, electronics, energy, space, biosensors, bioglass, medicine. and so on. In fact, the sol–gel technique is one of the oldest methods of crystal growth and makes use of cheap and available materials.

In particular, the purpose of this Special Issue is to publish high-quality research papers as well as review articles addressing recent advances on the Sol–Gel Method Applied to Crystalline Materials, describing the fundamental principles of crystallization of sol–gel systems in solution.

A study and comprehension of methods and mechanisms of the crystallization process for colloidal systems at temperatures less than 100 °C would allow a significant development of new materials using low-temperature sol–gel synthesis.

Potential topics include preparation methods, material characteristics, and applications of powder electrode materials.

Prof. Dr. Alessandro Dell'Era
Prof. Dr. Michelina Catauro
Guest Editors

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 papers will be 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. Crystals is an international peer-reviewed open access monthly 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 1600 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

  • Biomaterials
  • Nanoparticles
  • Thin films and coatings
  • Organic–inorganic hybrid materials
  • Catalysts
  • Sensors and biosensors
  • Energy
  • Optics

Published Papers (2 papers)

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Research

Open AccessArticle
Effect of the Zr-Substitution on the Structural and Electrical Properties of LaFeO3: XRD, Raman Scattering, SEM, and Impedance Spectroscopy Study
Crystals 2020, 10(5), 399; https://doi.org/10.3390/cryst10050399 - 15 May 2020
Abstract
The LaFe1−xZrxO3 (x = 0.01, 0.05) ceramics were prepared by sol-gel and annealing method and studied by XRD, Raman scattering analysis, SEM, and impedance spectroscopy method. The crystal structure and phonon characteristics analysis revealed that the crystal structure [...] Read more.
The LaFe1−xZrxO3 (x = 0.01, 0.05) ceramics were prepared by sol-gel and annealing method and studied by XRD, Raman scattering analysis, SEM, and impedance spectroscopy method. The crystal structure and phonon characteristics analysis revealed that the crystal structure tends to preserve its ideal orthorhombic structure, following the increase in driving force of the Fe/ZrO6 octahedral tilting. The frequency-dependent dielectric parameters at each temperature decreased with increasing Zr content. The temperature dependence dielectric relaxation and dc conduction mechanism satisfied the Arrhenius law and increased with increasing Zr content. The activation energy ranged from 0.30 to 0.50 eV and was similar in the relaxation and conduction mechanisms, indicating that both transport mechanisms were based on a similar mechanism. Full article
(This article belongs to the Special Issue Sol-Gel Method Applied to Crystalline Materials)
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Open AccessArticle
Sol-Gel Coatings for Subaquatic Self-Cleaning Windows
Crystals 2020, 10(5), 375; https://doi.org/10.3390/cryst10050375 - 07 May 2020
Abstract
Self-cleaning windows are well known for their ability to function with airborne pollutants, but there is a growing industry for semi-permanent subaquatic optical devices, where the performance of such windows should be considered. Here sol-gel technology is explored as a means of producing [...] Read more.
Self-cleaning windows are well known for their ability to function with airborne pollutants, but there is a growing industry for semi-permanent subaquatic optical devices, where the performance of such windows should be considered. Here sol-gel technology is explored as a means of producing self-cleaning, subaquatic, sapphire windows. We demonstrate removal of marine bacteria and, in the worst-case contamination scenario, dead North Sea crude oil (API 35). This greasy contaminant was smeared across the windows to effectively reduce optical transmission strength to just 54%. The titania-based sol-gel-coated windows can restore transmission to within 10% of the clean value in less than one day, unlike standard sapphire windows, which lose 68% transmission following contamination and aquatic submergence over the same duration. A range of theories to enhance the self-cleaning performance of the sol-gel coating were explored, but none of the tested variables were able to provide any enhancement for subaquatic performance. Full article
(This article belongs to the Special Issue Sol-Gel Method Applied to Crystalline Materials)
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Graphical abstract

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

1. Tentative Title: Effect of the Zr-substitution on the structural and electrical properties of LaFeO3: XRD, Raman scattering, SEM, and impedance spectroscopy study
Tentative Authors: D. Triyono and  I. Purnamasari
Affiliation: Department of Physics, Faculty of Mathematics and Natural Science (FMIPA), Universitas Indonesia Depok 16424, Indonesia
Tentative Abstract: The LaFe1-xZrxO3 (x = 0.01, 0.05) ceramics were prepared by sol-gel and annealing method and studied by XRD, Raman scattering analysis, SEM, and impedance spectroscopy method. The crystal structure and phonon characteristics analysis revealed that the crystal structure tends to preserve to ideal orthorhombic structure following by the increasing driving force of the Fe/ZrO6 octahedral tilting. The frequency-dependent dielectric parameters at each temperature decreased with increasing Zr content. The temperature dependence dielectric relaxation and dc conduction mechanism satisfied the Arrhenius law and increased with increasing Zr content. The activation energy ranged from 0.30 to 0.50 eV and was similar in the relaxation and conduction mechanisms, indicating that both transport mechanisms were based on a similar mechanism.
Tentative Keywords: LaFe1-xZrxO3, crystal structure, phonon characteristics, relaxation, conduction

2. Tentative Title: Sol-gel coatings for sub-aquatic self-cleaning sapphire windows
Tentative Author: Andrew Greer
Tentative Abstract: Self-cleaning windows are well known for their ability to function with airborne pollutants but there is a growing industry for semi-permanent sub-sea optical devices where the performance of such windows should be considered. Here self-cleaning sapphire windows are demonstrated to function in a purely sub-aquatic environment. We demonstrate removal of marine bacteria and, worst case scenario contamination, crude oil from Troll B in the North Sea. Crude oil was smeared across the windows to effectively reduce optical transmission strength to just 54%. The self-cleaning window are able to restore transmission to within 10% of the clean value in less than one day, unlike a standard sapphire window; which lost 68% transmission after contamination and submergence over the same duration. A range of theories to enhance the self-cleaning performance of the sol-gel coating were explored but none of the tested variables were able to provide any enhancement for sub aquatic performance.

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