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Investigation on Sol–Gel Based Coatings Application
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Investigation on Sol–Gel Based Coatings Application

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Surface Characterization, Deposition and Modification".

Deadline for manuscript submissions: closed (15 October 2023) | Viewed by 9997

Special Issue Editors

Dr. Tatiana N. Myasoedova

E-Mail Website
Guest Editor
Institute of Nanotechnologies, Electronics and Equipment Engineering, Southern Federal University, Chekhov str. 2, 347928 Taganrog, Russia
Interests: chemical engineering; sol–gel processing; composite materials; polymers and metal oxides; silicon-carbon materials; supercapaсitors; gas sensors
Dr. Galina Yalovega

E-Mail Website1 Website2
Guest Editor
Department of Physics of Nanosystems and Spectroscopy, Southern Federal University, Rostov-on-Don, Russia
Interests: spectral methods of characterization; theoretical simulation; nanosystems; nanocomposites; thin films; carbon materials
Dr. Nina Plugotarenko

E-Mail Website
Guest Editor Assistant
Department of Technosphere Safety and Chemistry, Institute of Nanotechnologies, Electronics and Electronic Equipment Engineering, Southern Federal University, 347900 Taganrog, Russia
Interests: fundamentals of functional materials processing; modeling; computational tools; and theoretical studies of functional materials; materials for gas sensor application

Special Issue Information

Dear Colleagues,

A powerful impetus for the development of sol–gel technology was the realization that sol–gel processes belong to nanotechnology since they allow obtaining nanocomposite, nanoporous and nanoscale inorganic and organo-inorganic materials. At the same time, according to many leading experts of the world, further prospects of using the sol–gel method will be associated with obtaining products of a specific application: microelectronics and optics. In addition, more than half of the oxide and glassy materials production of the XXI century are new monolithic or powdery materials and coatings that can be synthesized only using sol–gel processes.

The new materials obtained by the sol–gel method, called "second generation materials" by J. Mackenzie, include hybrid organo-inorganic nanocomposites that have been synthesized and used only in the last two decades. Currently, this direction has become the main one; by improving; the physicochemical properties and technical characteristics of various silicate materials.

At the same time, the largest number of studies have been devoted to the synthesis of hybrid; organo-inorganic materials, in which the organic component predominates. The urgent requirements of electronic, optical, electrical, and a number of other industries are associated with the need for a directional synthesis of materials with a wide range of practical applications. This can be realized by doping silicate materials with various metals and metalloids, giving them the necessary physicochemical properties (electrical, optical, mechanical, catalytic, etc.).

The scope of this Special Issue will serve as a forum for papers in the following concepts:

  • Fundamentals of sol–gel and hybrid materials processing;
  • Nanostructured coatings (aerogels, xerogels, cryogels, etc.);
  • Functional coatings, thin films, and membranes (including deposition techniques;
  • Characterization methods of sol–gel coatings;
  • Modeling, computational tools, and theoretical studies of sol–gel and hybrid coatings;
  • Sol–gel and hybrid coatings for catalytic, photoelectrochemical, and sensor applications;
  • Sol–gel and hybrid coatings for energy, environment, and building applications;
  • Sol–gel and hybrid coatings for dielectric, electronic, magnetic, and ferroelectric applications;
  • Sol–gel and hybrid coatings for optical, photonic, and optoelectronic applications.

In this Special Issue, original research articles and reviews are welcome.

We look forward to receiving your contributions.

Dr. Tatiana N. Myasoedova
Dr. Galina Yalovega
Guest Editors

Dr. Nina Plugotarenko
Guest Editor Assistant

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. Coatings 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 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

  • sol–gel and hybrid coatings
  • processing of coatings
  • modeling
  • functional sol–gel and hybrid coatings

Published Papers (5 papers)

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Research

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17 pages, 2141 KiB  
Article
Sol-Gel-Derived Functional Coatings for Pre-Sowing Seed Treatment
by Olga A. Shilova, Tamara V. Khamova, Gayane G. Panova, Olga R. Udalova, Anna M. Artemyeva, Dmitry L. Kornyukhin, Anton M. Nikolaev, Anastasiya S. Kovalenko, Alexandr A. Sinel’nikov and Gennady P. Kopitsa
Coatings 2023, 13(12), 1978; https://doi.org/10.3390/coatings13121978 - 21 Nov 2023
Viewed by 930
Abstract
The superatomic structure of film-forming sols obtained by the acid hydrolysis of tetraethoxysilane (TEOS) in an aqueous medium (free of organic solvents) was studied using the SAXS method. The formation of nanoparticles (NPs) was confirmed in alcohol-free silica sols with both a low [...] Read more.
The superatomic structure of film-forming sols obtained by the acid hydrolysis of tetraethoxysilane (TEOS) in an aqueous medium (free of organic solvents) was studied using the SAXS method. The formation of nanoparticles (NPs) was confirmed in alcohol-free silica sols with both a low (1 vol. %) content of TEOS and a high (10 vol. %) content of TEOS, hydrolyzed in an aqueous-alcoholic medium. A trimodal size distribution was revealed for the resulting NPs, with radii ranging from less than 1 nm to ~11 nm. The volume fraction of NPs tends to grow with increases in TEOS concentration, as well as with the introduction of magnetic NPs of iron oxides into silica sols. The synthesized silica sols and suspensions based on silica sols with FexOy NPs were used for the pre-sowing treatment of white and cauliflower cabbage seeds in order to provide a functional coating on their surfaces, thereby improving seed germination, stimulating their growth in the early stages of development, and suppressing the effect of phytopathogens. The effect of the pre-sowing seed treatment in sol-gel compositions on seed germination and the growth characteristics of plant seedlings is analyzed, including the influence of iron-oxide magnetic NPs’ compositions and concentrations in silica sols. Full article
(This article belongs to the Special Issue Investigation on Sol–Gel Based Coatings Application)
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13 pages, 4266 KiB  
Article
Effect of Glymo on the Morphological and Optical Properties of Eu3+-Doped Lu2SiO5 Films
by Andrea Danielle Cancino-Moreno, Arturo López-Marure, Jorge Humberto Luna-Domínguez, Ángel de Jesús Morales-Ramírez, Mayahuel Ortega-Avilés, José Alfredo Álvarez-Chávez and Margarita García-Hernández
Coatings 2023, 13(5), 915; https://doi.org/10.3390/coatings13050915 - 12 May 2023
Viewed by 1503
Abstract
Eu3+-(5% mol)-doped Lu2SiO5 optical quality films were prepared using the sol–gel method and dip-coating technique from lutetium and europium salts as the lanthanide precursors and tetraethyl orthosilicate (TEOS) as the silicon source. To increase the thickness of the [...] Read more.
Eu3+-(5% mol)-doped Lu2SiO5 optical quality films were prepared using the sol–gel method and dip-coating technique from lutetium and europium salts as the lanthanide precursors and tetraethyl orthosilicate (TEOS) as the silicon source. To increase the thickness of the films, 3-Glycidyloxypropyl trimethoxysilane (Glymo) was added as the rheological agent during sol formation. Structural, morphological, and luminescent properties were investigated for Lu2SiO5, Eu3+:Lu2SiO5, and Eu3+:Lu2SiO5/Glymo in order to obtain high quality in luminescent films. X-ray diffraction (XRD) results show that the incorporation of the Eu3+ ions do not affect the A-Type and B-Type monoclinic crystalline phase typical of Lu2SiO5, even after five dipping cycles on quartz substrates and a final annealing process at 1100 °C. The morphology and topography of the films were studied by SEM and AFM. These techniques revealed films without surfactant that were uniform with low rugosity while the film with surfactant presented porous hills and valleys with uneven high values of roughness. The photoluminescence spectrum of Eu3+:Lu2SiO5 films showed 2 broad emission peaks centered at 589 nm and 612 nm. The presence of Glymo in the system promoted the formation of residual Lu2Si2O7 compounds with the highest lifetime values compared with films without surfactant. The results of the films are promising for luminescent applications. Full article
(This article belongs to the Special Issue Investigation on Sol–Gel Based Coatings Application)
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14 pages, 2751 KiB  
Article
Prickly Pear Fruit Extract: Capping Agent for the Sol–Gel Synthesis of Discrete Titanium Dioxide Nanoparticles and Sensitizer for Dye-Sensitized Solar Cell
by Radhika Rajendhiran, Raji Atchudan, Jayabal Palanisamy, Athinarayanan Balasankar, Tae Hwan Oh, Venugopal Deivasigamani and Subramaniyan Ramasundaram
Coatings 2023, 13(3), 579; https://doi.org/10.3390/coatings13030579 - 7 Mar 2023
Cited by 5 | Viewed by 1785
Abstract
Plant extracts have been utilized as an ecofriendly natural reducing agent for the synthesis of nanomaterials, including metal oxides. Prickly pear (opuntia) fruit extract (PPE) was used as a reducing agent for the sol–gel synthesis of titanium dioxide nanoparticles (TiO2 NPs) and [...] Read more.
Plant extracts have been utilized as an ecofriendly natural reducing agent for the synthesis of nanomaterials, including metal oxides. Prickly pear (opuntia) fruit extract (PPE) was used as a reducing agent for the sol–gel synthesis of titanium dioxide nanoparticles (TiO2 NPs) and as a sensitizer for the TiO2 NPs photoanode used in dye-sensitized solar cells (DSSCs). Ultraviolet-visible and infrared spectra, X-ray diffraction patterns, and scanning electron microscopic images were confirmed in the formation of semiconducting TiO2 NPs with the predominate size of ~300 nm. The use of PPE rendered discrete TiO2 NPs, whereas the typical synthesis without PPE resulted TiO2 aggregates. TiO2 NPs had a tetragonal crystalline structure, and their grain size was varied with respect to the concentration of PPE. The size of TiO2 crystallites was found to be 20, 19, 15, and 10 nm when the volume percentage of PPE was 0.2, 0.4, 0.6, and 0.8%, respectively. TiO2 NPs obtained using PPE were coated on indium-doped tin oxide substrates and sensitized with natural dye made up of PPE and synthetic dyes, namely rose Bengal (RB) and eosin yellow (EY). The photoanode fabricated with dye-sensitized TiO2 NPs was subjected to current–voltage response studies. The maximum power-conversion efficiency, 1.4%, was recorded for photoanodes sensitized with PPE dye, which is considerably higher than that for RB (1.16%) or EY (0.8%). Overall, the above findings proved that PPE can be used as a potential reducing/capping agent and TiO2 sensitizer for DSSC applications. Full article
(This article belongs to the Special Issue Investigation on Sol–Gel Based Coatings Application)
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17 pages, 22639 KiB  
Article
Step-by-Step Modeling and Experimental Study on the Sol–Gel Porous Structure of Percolation Nanoclusters
by Irina Kononova, Pavel Kononov and Vyacheslav Moshnikov
Coatings 2023, 13(2), 449; https://doi.org/10.3390/coatings13020449 - 16 Feb 2023
Cited by 2 | Viewed by 1637
Abstract
Non-conventional crystallization techniques have been developed in recent years. Non-conventional crystallization techniques use primary structural elements (for example, clusters) rather than atoms and molecules. Modern nanomaterial science is going through great changes as an entirely new approach of non-conventional growth mechanisms is emerging [...] Read more.
Non-conventional crystallization techniques have been developed in recent years. Non-conventional crystallization techniques use primary structural elements (for example, clusters) rather than atoms and molecules. Modern nanomaterial science is going through great changes as an entirely new approach of non-conventional growth mechanisms is emerging due to cluster coupling, catalyzing interest in cluster physics. The formation of fractal and percolation clusters has increased. We carried out step-by-step modeling and an experimental study of the formation of fractal and percolation clusters based on tin dioxide and silicon dioxide and formed by sol–gel technology. In this paper, the growth of fractal aggregates (clusters) from sol particles SnO2 and SiO2 based on the modified models of diffusion-limited and cluster–cluster aggregation is discussed. A percolation model using simulated fractal clusters of SnO2 and SiO2 particles is proposed. Experimental data on the sol–gel percolation structure of porous nanocomposites are presented. The modeling of SnO2 and SiO2 particles, which also consist of clusters (the next step in the hierarchy), is shown. We propose a generalized hierarchical three-dimensional percolation cluster model that allows calculating the surface area, knowing the experimental sizes of macropores and taking into account the micro- and mesopores (sizes less than a few nanometers). Full article
(This article belongs to the Special Issue Investigation on Sol–Gel Based Coatings Application)
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Review

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30 pages, 10080 KiB  
Review
Sol-Gel Materials for Electrochemical Applications: Recent Advances
by Tatiana N. Myasoedova, Rajathsing Kalusulingam and Tatiana S. Mikhailova
Coatings 2022, 12(11), 1625; https://doi.org/10.3390/coatings12111625 - 26 Oct 2022
Cited by 7 | Viewed by 3509
Abstract
This review article emphases on the modern approaches to the types of sol-gel materials that are beneficial for electrochemistry, monitored by a report of recent advances in the numerous fields of sol-gel electrochemistry. Modified electrodes for sensors and supercapacitors as well as anti-corrosion [...] Read more.
This review article emphases on the modern approaches to the types of sol-gel materials that are beneficial for electrochemistry, monitored by a report of recent advances in the numerous fields of sol-gel electrochemistry. Modified electrodes for sensors and supercapacitors as well as anti-corrosion are described. Sol-gel synthesis expands the capabilities of technologists to obtain highly porous, homogeneous, and hybrid thin-film materials for supercapacitor electrode application. The widespread materials are transition metal oxides, but due to their low conductivity, they greatly impede the rate capability of electrochemical supercapacitors. The way to optimize their properties is the production of complex oxides or different composites. Among the new materials, a special place is occupied by perovskites and materials with an olivine-type structure, which can be easily obtained by the sol-gel method. The sol-gel coating process has demonstrated excellent chemical stability to advance the corrosion resistance of the various metal alloy substrates. Furthermore, the sol-gel process is a user-friendly technique for applying a hybrid sol-gel coating to provide corrosion resistance. The hybrid sol-gel coating technique is the most attractive, easy to prepare at a lower temperature, and has shown the potential to swap Cr-based coatings. The hybrid sol-gel coating has exhibited promising properties of adherent and uses chemically inert to enhance the corrosion resistance of the metal and alloys. Hence, this review article emphases on the recent advances and approaches in the sol-gel coating processes that influence the belongings of its hybrid sol-gel coating for protecting metal substrates and their alloys from corrosion. In addition, the author discusses the current problem and challenges of hybrid anti-corrosion sol-gel coatings. Metal oxides and composites based on them are actively used to create electrochemical sensors. They synthesized, including the anhydrous and citrate sol-gel methods. Such materials are widely used as glucose biosensors and harmful gas sensors. Full article
(This article belongs to the Special Issue Investigation on Sol–Gel Based Coatings Application)
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