Hydrophilic Titania Thin Films from a Molecular Precursor Film Formed via Electrospray Deposition on a Quartz Glass Substrate Precoated with Carbon Nanotubes

Shafudah, Natangue Heita; Nagai, Hiroki; Suwazono, Yutaka; Ozawa, Ryuhei; Kudoh, Yukihiro; Takahashi, Taiju; Onuma, Takeyoshi; Sato, Mitsunobu

doi:10.3390/coatings10111050

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…The wear and failure of mechanical equipment parts usually start from the surface; therefore, in order to improve the stability and durability of mechanical parts, it is very important to strengthen the surface quality of the parts [3,4]. Functional coating is one of the most effective methods to improve the surface quality of machine parts [5][6][7]. A functional coating for a friction unit (FU) is used on curvilinear and flat surfaces through various mechanisms, such as turbo-compressor units, electric motors, power engineering units, power transmission systems, etc.…”

Section: Introductionmentioning

confidence: 99%

The Characterization of Running-In Coatings on the Surface of Tin Bronze by Electro-Spark Deposition

Zhengchuan

Коноплянченко²,

Tarelnyk³

et al. 2022

Coatings

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Antifriction materials, such as silver, copper, Babbitt B83, and graphene oxide (GO), were used to prepare running-in coatings on the surface of bronze QSn10-1 by electro-spark deposition (ESD). The analyses of mass transfer, roughness, thickness, morphology, composition, nanoindentation, and tribological properties of the coatings were investigated. The results showed that the running-in coatings were dense with refined grains that were uniformly distributed and in a metallurgical bond state with the tin bronze substrate. At optimum process parameters, the mass transfer was 244.2 mg, the surface roughness was 15.9 μm, and the thickness of the layers was 160 μm. The diffraction peaks clearly indicated the phases corresponding to α-Sn, SbSn, Cu6Sn5, and Cu, and a phase of Ag3Sn appeared. The modulus and the hardness of the running-in coatings were 24.9% and 14.2% of the substrate, and the deformation ratio of the coatings was 10.2% higher than that of the substrate. The friction coefficient of the running-in coatings was about 0.210 after the running-in stage, which was 64.8% of that of the substrate (0.324). The main wear mechanism of the running-in coatings under optimal process parameters is plastic deformation, scratching, and slight polishing. The running-in coating deformation under the action of high specific loads provides the automatic adjustment of parts and compensation for manufacturing errors.

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Section: Introductionmentioning

confidence: 99%

The Characterization of Running-In Coatings on the Surface of Tin Bronze by Electro-Spark Deposition

Zhengchuan

Коноплянченко²,

Tarelnyk³

et al. 2022

Coatings

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Factors Influencing TiO2-based Composites for Water Decolorization: A Systematic Review

Daniel,

Uahengo,

Rahman

2024

Novel Materials and Water Purification

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The widespread use of synthetic dyes and their release into aquatic environments poses significant risks to human health and ecosystems. As a process for dye removal that is environmentally benign and green, photocatalysis has gained a lot of interest. Composites made of TiO2 have demonstrated potential as photocatalytic materials for water decolorization. In this study, we used key phrase analysis, keyword co-occurrence, and bibliographic couplings to examine 131 articles from the Scopus database (2017–2023). We investigated how TiO2-based composites—including doped TiO2, mixed metal oxides and supporting substrates—could be categorized based on composition. We studied various factors, such as pH, temperature, coexisting compounds, reaction time, light intensity, and initial dye concentration. These factors were found to influence the performance and stability of TiO2-based composites in water decolorization. It was discovered that doping is a method for improving light absorption of TiO2 by reducing its bandgap. The relationships between these variables also imply that the ideal photocatalytic conditions may differ based on the particular composite, dye, and environmental conditions used. Consequently, optimizing these parameters is crucial for obtaining the best photocatalytic activity.

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Selective formation of cubic or tetragonal zirconia thin films of transparent, with no use of metal ion stabilizer by heating molecular precursor films under mild conditions

Shafudah

Nagai

Sato

2021

Funct. Mater. Lett.

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Cubic or tetragonal zirconia thin films of transparent and 100 nm thickness were selectively formed on a quartz glass substrate by heat-treating the molecular precursor films involving Zr(IV) complexes of nitrilotriacetic acid, at 500[Formula: see text]C in air for 1 h. A precursor solution was prepared by a reaction of the ligand and zirconium tetrabutoxide in alcohol under the presence of butylamine. By the addition of H2O2 or H2O into the solution, the spin-coated precursor films were converted to cubic zirconia thin films by the abovementioned procedure. Further, the identical phase was produced also in the case of the electro-sprayed precursor film which was formed by an addition of H2O2 into the solution. On the other hand, the tetragonal zirconia thin film was obtained from a precursor film formed by using a solution dissolving the original Zr(IV) complex of the ligand, without H2O2 nor H2O. The crystal structure of all thin films was determined by using both the X-ray diffraction (XRD) patterns and Raman spectra. Thus, the zirconia thin films of both crystals could be facilely and selectively obtained with no use of hetero-metal ion stabilizers. The XPS spectra of the thin films show that the O/Zr ratio of the cubic phase is 1.37 and slightly larger than tetragonal one (1.29), and also demonstrate that the nitrogen atoms, which may contribute to stabilize these metastable phases at room temperature, of about 5−7 atomic% was remained in the resultant thin films. The adhesion strengths of cubic zirconia thin film onto the quartz glass substrate was 68 MPa and larger than that of tetragonal one, when the precursor films were formed via a spin coating process. The optical and surface properties of the thin films were also examined in relation to the crystal systems.

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Hydrophilic Titania Thin Films from a Molecular Precursor Film Formed via Electrospray Deposition on a Quartz Glass Substrate Precoated with Carbon Nanotubes

Cited by 3 publications

References 34 publications

The Characterization of Running-In Coatings on the Surface of Tin Bronze by Electro-Spark Deposition

The Characterization of Running-In Coatings on the Surface of Tin Bronze by Electro-Spark Deposition

Factors Influencing TiO2-based Composites for Water Decolorization: A Systematic Review

Selective formation of cubic or tetragonal zirconia thin films of transparent, with no use of metal ion stabilizer by heating molecular precursor films under mild conditions

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