Special Issue "Functional Titanium-Based Materials: Complexes, Composites and Coatings"

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

Deadline for manuscript submissions: 15 May 2020.

Special Issue Editor

Assoc. Prof. Piotr Piszczek
Website
Guest Editor
Department of Chemistry; Nicolaus Copernicus University in Toruń, 87-100 Toruń, Poland
Interests: titanium and titania-based biomaterial; titanium(IV) oxo-complexes; structural studies and spectral characterization; physicochemical properties; bioactivity; medical applications

Special Issue Information

Dear Colleagues,

Titanium and titanium-based materials are widely applied in variety of fields, ranging from the aviation and automotive industries to biomedical technologies. This is due to the high mechanical strength of titanium in relation to its low weight, adequate linear elasticity, and good corrosion resistance in most aggressive environments. Simultaneously, the photocatalytic activity, semiconducting properties, and bioactivity of materials such as titania nanocoatings of different structure and surface architecture, as well as titania-based nanocomposites, contribute to the great interest in studies on the possibility of their application as biomedical and self-cleaning coatings. The works on new materials exhibiting appropriate biointegral properties and adequate antimicrobial activity, which may be applied in the design and the construction of modern medical devices (e.g., implants) are especially important. Moreover, the composites containing titanium(IV) oxo-complexes as inorganic blocks arouse interest lately due to the possibility of their use as systems for disinfection, sterilization, and deodorization.

In spite of many published publications, titanium complexes and titania-based materials are still attractive topics in many research studies on their production, structural, and spectral characterization, estimation of their physicochemical and mechanical properties, and of their photocatalytic activity and bioactivity. Knowledge of these properties and their synergistic effects is very important for optimal applications of these materials in various fields.

The purpose of this Special Issue is to present the results of the latest works about titanium-based materials, especially titania nanocoatings of different architectures, titanium complexes/oxo-complexes, and also titanium-based nanocomposites. This Special Issue should be a place for both exchanging experiences as well as for further cooperation.

Your contributions are welcome.

Prof. Piotr Piszczek
Guest Editor

Manuscript Submission Information

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Keywords

  • titanium-based materials
  • titanium complexes and oxo-complexes
  • titania nanocoatings
  • nanocomposites
  • physicochemical, mechanical properties
  • photocatalytic activity
  • bioactivity of titanium-based materials
  • titanium medical devices.

Published Papers (5 papers)

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Research

Open AccessArticle
Hybrid TiO2–Polyaniline Photocatalysts and their Application in Building Gypsum Plasters
Materials 2020, 13(7), 1516; https://doi.org/10.3390/ma13071516 - 26 Mar 2020
Abstract
Hybrid materials of conjugated polymer and titanium(IV) oxide have attracted considerable attention concerning their potential benefits, including (i) efficient exploitation of visible light, (ii) a high adsorption capacity for organic contaminants, (iii) and effective charge carriers separation. The new class of the photocatalysts [...] Read more.
Hybrid materials of conjugated polymer and titanium(IV) oxide have attracted considerable attention concerning their potential benefits, including (i) efficient exploitation of visible light, (ii) a high adsorption capacity for organic contaminants, (iii) and effective charge carriers separation. The new class of the photocatalysts is promising for the removal of environmental pollutants in both aqueous and gaseous phases. For the first time, in this study, the polyaniline (PANI)–TiO2 hybrid composite was used for the degradation of phenol in water and toluene in the gas phase. Polyaniline–TiO2 was prepared by the in situ polymerization of aniline on the TiO2 surface. The obtained hybrid material was characterized by diffuse reflectance spectroscopy (DR/UV-Vis), X-ray diffraction (XRD), fast-Fourier transformation spectroscopy (FTIR), photoluminescence (PL) spectroscopy, microscopy analysis (SEM/TEM), and thermogravimetric analysis (TGA). An insight into the mechanism was shown based on the photodegradation analysis of charge carrier scavengers. Polyaniline is an efficient TiO2 photosensitizer for photodegradation in visible light (λ > 420 nm). The trapping experiments revealed that mainly h+ and ˙OH were the reactive oxygen species that were responsible for phenol degradation. Furthermore, the PANI–TiO2 hybrid nanocomposite was used in gypsum plaster to study the self-cleaning properties of the obtained building material. The effect of PANI–TiO2 content on the hydrophilic/hydrophobic properties and crystallographic structure of gypsum was studied. The obtained PANI–TiO2-modified gypsum plaster had improved photocatalytic activity in the reaction of toluene degradation under Vis light. Full article
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Open AccessArticle
Processing and Mechanical Properties of Ti2AlC MAX Phase Reinforced AE44 Magnesium Composite
Materials 2020, 13(4), 995; https://doi.org/10.3390/ma13040995 - 23 Feb 2020
Abstract
AE44 alloys and nanolaminated Ti2AlC particle-reinforced AE44 magnesium composites were synthesized by stir casting techniques and textured by hot extrusion methods. It was found that lamellar Al11RE3 precipitates spheroidized with the introduction of Ti2AlC into the [...] Read more.
AE44 alloys and nanolaminated Ti2AlC particle-reinforced AE44 magnesium composites were synthesized by stir casting techniques and textured by hot extrusion methods. It was found that lamellar Al11RE3 precipitates spheroidized with the introduction of Ti2AlC into the AE44 matrix. Both transmission electron microscope and planar disregistries calculations reveal a good match for interfacial lattice transition between Mg (0001) and the basal plane (0001) of Ti2AlC. This suggests that Ti2AlC is an efficient potent nucleating substrate for Mg, thus fertilizing the formation of strong interfacial bonds. After hot extrusion treatment, Ti2AlC particles were reoriented in the textured magnesium matrix, as confirmed by X-ray diffraction. This texture effect on the composite’s mechanical properties was carefully studied by tensile and compressive tests. Full article
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Open AccessArticle
Optical Properties of Titanium in the Regime of the Limited Light Penetration
Materials 2020, 13(4), 952; https://doi.org/10.3390/ma13040952 - 20 Feb 2020
Abstract
In this study, the titanium layers from 12 to 1470 nm thick were fabricated by using the method involving dynamically changed working gas pressure (gas injection magnetron sputtering). The influence of the deposition time on the optical and electrical properties of Ti films, [...] Read more.
In this study, the titanium layers from 12 to 1470 nm thick were fabricated by using the method involving dynamically changed working gas pressure (gas injection magnetron sputtering). The influence of the deposition time on the optical and electrical properties of Ti films, as well as on their microstructure, are considered. The samples are investigated by means of spectroscopic ellipsometry, atomic force microscopy, X-ray diffraction, and confocal optical microscopy. Additionally, for the Ti layers, the sheet resistance was determined. The produced coatings exhibit privileged direction of growth (002). The obtained results show a gradual increase in the mean relaxation time of free-carriers with the increase in the thickness of titanium film. However, the plasma energy exhibits maximum for the coating with the thickness of 93 nm. For such thickness, the lowest value of optical resistivity (about 200 μ Ω cm) was observed. It was found that the dc- and optical resistivity exhibit similar values for titanium films with thickness up to 93 nm. For thicker Ti layers, significant differences in resistivities (dc- and optical) were noticed. The behavior of the Drude parameter (the plasma energy), calculated optical resistivity, and discrepancies between values of optical and dc-resistivities for thicker Ti coatings can be explained as a result of the limited light penetration. Full article
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Open AccessArticle
Ni/Si-Codoped TiO2 Nanostructure Photoanode for Enhanced Photoelectrochemical Water Splitting
Materials 2019, 12(24), 4102; https://doi.org/10.3390/ma12244102 - 08 Dec 2019
Abstract
We synthesized Ni/Si-codoped TiO2 nanostructures for photoelectrochemical (PEC) water splitting, by electrochemical anodization of Ti-1Ni-5Si alloy foils in ethylene glycol/glycerol solutions containing a small amount of water. The effects of annealing temperature on PEC properties of Ni/Si-codoped TiO2 photoanode were investigated. [...] Read more.
We synthesized Ni/Si-codoped TiO2 nanostructures for photoelectrochemical (PEC) water splitting, by electrochemical anodization of Ti-1Ni-5Si alloy foils in ethylene glycol/glycerol solutions containing a small amount of water. The effects of annealing temperature on PEC properties of Ni/Si-codoped TiO2 photoanode were investigated. We found that the Ni/Si-codoped TiO2 photoanode annealed at 700 °C had an anatase-rutile mixed phase and exhibited the highest photocurrent density of 1.15 mA/cm2 at 0 V (vs. Ag/AgCl), corresponding to a photoconversion efficiency of 0.70%, which was superior to Ni-doped and Si-doped TiO2. This improvement in PEC water splitting could be attributed to the extended light absorption, faster charge transfer, possibly lower charge recombination, and longer lifetime. Full article
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Open AccessArticle
Trinuclear Oxo-Titanium Clusters: Synthesis, Structure, and Photocatalytic Activity
Materials 2019, 12(19), 3195; https://doi.org/10.3390/ma12193195 - 29 Sep 2019
Abstract
The interest in titanium (IV) oxo-complexes is due to their potential application in photodegradation processes and environmental pollutants reduction. Titanium (IV) oxo-complexes (TOCs) of the general formula [Ti3O(OiPr)8(OOCR’)2] (R’ = -C13H9 ( [...] Read more.
The interest in titanium (IV) oxo-complexes is due to their potential application in photodegradation processes and environmental pollutants reduction. Titanium (IV) oxo-complexes (TOCs) of the general formula [Ti3O(OiPr)8(OOCR’)2] (R’ = -C13H9 (1), -p-PhCl (2), -m-PhNO2 (3), -C4H7 (4)) were synthesized and structurally characterized. The use of the different carboxylate ligands allowed modulating the optical band gaps of the produced microcrystals, which were measured via diffuse reflectance ultraviolet and visible spectroscopy (UV-Vis-DRS) and calculated using the density functional theory (DFT) method. The dispersion of TOCs (13) in the poly (methyl methacrylate) matrix (PMMA) led to the formation of polymer/TOCs composites, which in the next stage of our works have been applied in the photocatalytic activity estimation of synthesized trinuclear Ti(IV) oxo-complexes. Studies of the photocatalytic degradation of methylene blue (MB) induced by UV irradiation exhibit that the PMMA-TOCs composite containing (1) oxo-clusters is the most active, followed by the system containing the complex (3). Full article
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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. Maciej Janek, Tadeusz M. Muzioł, and Piotr Piszczek*

Trinuclear Oxo-titanium(IV) Clusters: Synthesis, Structure, and Photocatalytic Activity

2. Yi Wang, et al. Preparation and Effects of amorphous aluminum-titanium metallic composition on thermal decomposition of high explosives.

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