Special Issue "Hybrid and Composite Coatings and Thin Films"

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

Deadline for manuscript submissions: 30 June 2020.

Special Issue Editors

Assoc. Prof. Ubirajara Pereira Rodrigues Filho
Website
Guest Editor
Instituto de Química de São Carlos, Universidade de Sao Paulo - USP, Sao Paulo, Brazil
Interests: hybrid and composite materials; photoactive materials; nanomaterials; anti-bacterial materials; CO2 as a raw material for materials development
Prof. Sara Aldabe Bilmes
Website
Guest Editor
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Instituto de Química Física de los Materiales, Medio Ambiente y Energía (INQUIMAE), Buenos Aires, Argentina
Interests: sol–gel; photocatalysis; mesoporous particles and films; nanocomposite particles and films
Dr. Michel Wong Chi Man
Website
Guest Editor
Institut Charles Gerhardt Montpellier, Ecole Nationale Supérieure de Chimie de Montpellier - Montpellier, France
Interests: hybrid silicas; sol–gel; supported homogeneous catalysis; nanostructured hybrid materials; controlled drug delivery

Special Issue Information

Dear Colleagues,

Composite coatings are those coatings assembled together or dispersed as minor phases (organic or inorganic) in a major component phase (inorganic or organic) to improve their individual properties. If the minor phase has nanometric dimensions, the coatings are nanocomposites. In the particular case that one or more phases are produced from molecular precursors during the nanocomposite formation and one of them is organic while the other is inorganic, we obtain hybrid inorganic–organic materials.

Regarding inorganic–organic hybrid materials, their number has steadily grown during the past 20 years, as a result of the ever-growing number of molecular precursors, both organic and inorganic, leading to a myriad of multifunctional materials with applications spreading from civil engineering through energy storage/generation, (bio-, electro-, photo-) catalysis, sensors, photonics, memory devices, to dentistry and medicine.

Nanocomposite coatings, either organic–inorganic or inorganic–inorganic, have excellent properties for anticorrosion, antimicrobial, antifogging, and self-cleaning applications, as well as unique optical properties.

New achievements are rapidly expanding our knowledge in the area, thus leading to promising  applications of these materials in different domains of science and technology.

Therefore, its our pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are all welcome.

Assoc. Prof. Ubirajara Pereira Rodrigues Filho
Prof. Sara Aldabe Bilmes
Dr. Michel Wong Chi Man
Guest Editors

Manuscript Submission Information

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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 2000 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

  • hybrid coating and thin films
  • multifunctional coatings
  • inorganic–organic hybrid coatings and thin films
  • composite coatings and thin films
  • sol–gel coatings and thin films
  • mesoporous thin films
  • layered coatings

Published Papers (6 papers)

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Research

Open AccessArticle
Preparation of UV-Curable Low Surface Energy Polyurethane Acrylate/Fluorinated Siloxane Resin Hybrid Coating with Enhanced Surface and Abrasion Resistance Properties
Materials 2020, 13(6), 1388; https://doi.org/10.3390/ma13061388 - 19 Mar 2020
Abstract
Low surface energy coatings have gained considerable attention due to their superior surface hydrophobic properties. However, their abrasion resistance and sustainability of surface hydrophobicity are still not very satisfactory and need to be improved. In this work, a series of utraviolet (UV)-curable fluorosiloxane [...] Read more.
Low surface energy coatings have gained considerable attention due to their superior surface hydrophobic properties. However, their abrasion resistance and sustainability of surface hydrophobicity are still not very satisfactory and need to be improved. In this work, a series of utraviolet (UV)-curable fluorosiloxane copolymers were synthesized and used as reactive additives to prepare polyurethane acrylate coatings with low surface energy. The effect of the addition of the fluorinated graft copolymers on the mechanical durability and surface hydrophobicity of the UV-cured hybrid films during the friction-annealing treatment cycles was investigated. The results show that introducing fluorosiloxane additives can greatly enhance surface hydrophobicity of the hybrid film. With addition of 2 wt.% fluorosiloxane copolymers, the water contact angle (WCA) value of the hybrid film was almost tripled compared to that of the pristine PU film, increasing from 58° to 144°. The hybrid film also showed enhanced abrasion resistance and could withstand up to about 60 times of friction under a pressure of 20 kPa. The microstructure formed in the annealed film was found to contribute much to achieve better surface hydrophobicity. The polyurethane acrylate/fluorinated siloxane resin hybrid film prepared in this study exhibits excellent potential for applications in the low surface energy field. Full article
(This article belongs to the Special Issue Hybrid and Composite Coatings and Thin Films)
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Open AccessArticle
Insertion of Iron Decorated Organic–Inorganic Cage-Like Polyhedral Oligomeric Silsesquioxanes between Clay Platelets by Langmuir Schaefer Deposition
Materials 2020, 13(1), 216; https://doi.org/10.3390/ma13010216 - 04 Jan 2020
Abstract
Tuning the architecture of multilayer nanostructures by exploiting the properties of their constituents is a versatile way to develop multifunctional films. Herein, we report a bottom-up approach for the fabrication of highly ordered hybrid films consisting of dimethyldioctadecylammonium (DODA), iron decorated polyhedral oligomeric [...] Read more.
Tuning the architecture of multilayer nanostructures by exploiting the properties of their constituents is a versatile way to develop multifunctional films. Herein, we report a bottom-up approach for the fabrication of highly ordered hybrid films consisting of dimethyldioctadecylammonium (DODA), iron decorated polyhedral oligomeric silsesquioxanes (POSS), and montmorillonite clay platelets. Clay platelets provided the template where Fe/POSS moieties were grafted by the use of the surfactant. Driven by the iron ions present, DODA adopted a staggered arrangement, which is essential to realize the controllable layer-by-layer growth of the film. The elemental composition of the film was studied by X-ray photoelectron spectroscopy and X-ray reflectivity confirmed the existence of smooth interfaces between the different layers. Full article
(This article belongs to the Special Issue Hybrid and Composite Coatings and Thin Films)
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Open AccessArticle
Perfect Combination of LBL with Sol–Gel Film to Enhance the Anticorrosion Performance on Al Alloy under Simulated and Accelerated Corrosive Environment
Materials 2020, 13(1), 111; https://doi.org/10.3390/ma13010111 - 25 Dec 2019
Abstract
Given their outstanding versatile properties, multilayered anticorrosion coatings have drawn great interest from researchers in the academic and engineering fields. However, the application of multilayered coatings is restricted by some limitations such as low interlayer compatibilities, the harsh preparation process, etc. This work [...] Read more.
Given their outstanding versatile properties, multilayered anticorrosion coatings have drawn great interest from researchers in the academic and engineering fields. However, the application of multilayered coatings is restricted by some limitations such as low interlayer compatibilities, the harsh preparation process, etc. This work introduced a composite film fabricated on a 2A12 aluminum alloy surface, including an anodic oxide film, a sol–gel film, and a layer-by-layer (LBL) self-assembling film from bottom to top. The microstructure and elemental characterization indicated that the finish of the coating with the LBL film resulted in a closely connected multilayered coating with a smoother surface. The anticorrosion performance was systematically evaluated in the simulated corrosive medium and neutral salt spray environment. The integrated coating with the LBL film presented an excellent anticorrosion ability with system impedance over 108 Ω·cm2 and a self-corrosion current density two orders of magnitude lower than that of the other coatings. After the acceleration test in a salt spray environment, the multilayered coatings could still show a good protective performance with almost no cracks and no penetration of chloride ions. It is believed that the as-constructed multilayered coating with high corrosive properties and a fine surface state will have promising applications in the field of anticorrosion engineering. Full article
(This article belongs to the Special Issue Hybrid and Composite Coatings and Thin Films)
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Open AccessArticle
Development of Marine Antifouling Epoxy Coating Enhanced with Clay Nanotubes
Materials 2019, 12(24), 4195; https://doi.org/10.3390/ma12244195 - 13 Dec 2019
Abstract
An antifouling epoxy resin doped with natural clay nanotubes that are loaded with biocide or silver allowed extended protection against the proliferation of marine microorganisms. Compared to the 2–3 months of protection with antifoulant dichlorooctylisothiazolone (DCOIT) directly admixed into epoxy resin, the DCOIT [...] Read more.
An antifouling epoxy resin doped with natural clay nanotubes that are loaded with biocide or silver allowed extended protection against the proliferation of marine microorganisms. Compared to the 2–3 months of protection with antifoulant dichlorooctylisothiazolone (DCOIT) directly admixed into epoxy resin, the DCOIT release time of the halloysite formulations was extended to 12 months by incorporating biocide-loaded nanoclay in the polymer matrix. The protective properties of the epoxy-halloysite nanocomposites showed much less adhesion and proliferation of marine bacteria Vibrio natriegens on the resin surface after a two-month exposure to seawater than the coating formulations directly doped with non-encapsulated DCOIT. The coating formulation protection efficiency was further confirmed by twelve-month shallow field tests in the South China Sea. Replacing 2 wt.% biocide in the traditional formula with DCOIT-loaded natural environmentally friendly halloysite clay drastically improved the antifouling properties of the epoxy coating, promising scalable applications in protective marine coating. The antifouling property of epoxy resin was enhanced with silver particles synthesized on halloysite nanotubes. A natural mixture of MnO particles and halloysite could also be used as a nonbiocide additive to marine coating. The short-term White Sea water test of epoxy coating with 5% of Ag-halloysite composite of MnO-halloysite natural mixture showed no visible fouling. Full article
(This article belongs to the Special Issue Hybrid and Composite Coatings and Thin Films)
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Open AccessFeature PaperArticle
Deposition Kinetics of Thin Silica-Like Coatings in a Large Plasma Reactor
Materials 2019, 12(19), 3238; https://doi.org/10.3390/ma12193238 - 03 Oct 2019
Abstract
An industrial size plasma reactor of 5 m3 volume was used to study the deposition of silica-like coatings by the plasma-enhanced chemical vapor deposition (PECVD) method. The plasma was sustained by an asymmetrical capacitively coupled radio-frequency discharge at a frequency of 40 [...] Read more.
An industrial size plasma reactor of 5 m3 volume was used to study the deposition of silica-like coatings by the plasma-enhanced chemical vapor deposition (PECVD) method. The plasma was sustained by an asymmetrical capacitively coupled radio-frequency discharge at a frequency of 40 kHz and power up to 7 kW. Hexamethyldisilioxane (HMDSO) was introduced continuously at different flows of up to 200 sccm upon pumping with a combination of roots and rotary pumps at an effective pumping speed between 25 and 70 L/s to enable suitable gas residence time in the plasma reactor. The deposition rate and ion density were measured continuously during the plasma process. Both parameters were almost perfectly constant with time, and the deposition rate increased linearly in the range of HMDSO flows from 25 to 160 sccm. The plasma density was of the order of 1014 m−3, indicating an extremely low ionization fraction which decreased with increasing flow from approximately 2 × 10−7 to 6 × 10−8. The correlations between the processing parameters and the properties of deposited films are drawn and discussed. Full article
(This article belongs to the Special Issue Hybrid and Composite Coatings and Thin Films)
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Open AccessCommunication
Enhanced Wear Performance of Cu-Carbon Nanotubes Composite Coatings Prepared by Jet Electrodeposition
Materials 2019, 12(3), 392; https://doi.org/10.3390/ma12030392 - 27 Jan 2019
Abstract
Cu-carbon nanotubes (CNTs) composite coatings with high CNT content and uniformly distributed CNTs were successfully prepared via jet electrodeposition. Pristine CNTs, without any treatment like acid functionalization, were used. Anionic surfactant sodium dodecyl sulfate (SDS) was used to increase the wettability of the [...] Read more.
Cu-carbon nanotubes (CNTs) composite coatings with high CNT content and uniformly distributed CNTs were successfully prepared via jet electrodeposition. Pristine CNTs, without any treatment like acid functionalization, were used. Anionic surfactant sodium dodecyl sulfate (SDS) was used to increase the wettability of the CNTs and improve the content of incorporated CNTs. With an appropriate SDS concentration (300 mg/L) in the electrolyte, the incorporated CNT content is as high as 2.84 wt %, much higher than the values reported using conventional electrodeposition (0.42–1.05 wt %). The high-content CNTs were uniformly distributed in the composite coating. The surface morphology of this composite coating (2.84 wt % CNTs) was flat due to the uniform electric field in jet electrodeposition. In the wear test a with load of 1 N and sliding speed of 0.02 m/s, the wear rate of this composite coating was 1.3 × 10−2 mg/Nm, 85.4% lower than that of pure Cu. The enhanced wear performance of Cu-CNTs composite coatings can be attributed to high CNT content and flat surface morphology. Full article
(This article belongs to the Special Issue Hybrid and Composite Coatings and Thin Films)
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