Synthesis and Characterization of Complex Nanostructured Thin Films Based on Titanium for Industrial Applications

Vladoiu, R.; Mandes, Aurelia; Dinca, Virginia; Bǎlǎșoiu, M.; Soloviov, Dmytro; Турченко, В. А.

doi:10.3390/ma13020399

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…The principle of the TVA is based on the combination of the anodic arc with a powerful electron gun system. It is a versatile method for performing multimaterial processing, such as in the case of alloy/composite thin films at a nanometric scale [ 27 , 28 , 29 , 30 , 31 ].…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Cobalt–Nickel Aluminate Spinels Using the Laser-Induced Thermionic Vacuum Arc Method and Thermal Annealing Processes

et al. 2022

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To obtain highly homogeneous cobalt–nickel aluminate spinels with small crystallite sizes, CoNiAl alloy thin films were primarily deposited using Laser-induced Thermionic Vacuum Arc (LTVA) as a versatile method for performing processing of multiple materials, such as alloy/composite thin films, at a nanometric scale. Following thermal annealing in air, the CoNiAl metallic thin films were transformed into ceramic oxidic (Co,Ni)Al2O4 with controlled composition and crystallinity suitable for thermal stability and chemical resistance devices. Structural analysis revealed the formation of (Co,Ni)Al2O4 from the amorphous CoNiAl alloys. The mean crystallite size of the spinels was around 15 nm. Thermal annealing induces a densification process, increasing the film thickness together with the migration process of the aluminum toward the surface of the samples. The sheet resistance changed drastically from 200–240 Ω/sq to more than 106 Ω/sq, revealing a step-by-step conversion of the metallic character of the thin film to a dielectric oxidic structure. These cermet materials can be used as inert anodes for the solid oxide fuel cells (SOFCs), which require not only high stability with respect to oxidizing gases such as oxygen, but also good electrical conductivity. These combination metal–ceramics are known as bi-layer anodes. By controlling the crystallite size and the interplay between the oxide/metal composite, a balance between stability and electrical conductivity can be achieved.

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Section: Methodsmentioning

confidence: 99%

Synthesis of Cobalt–Nickel Aluminate Spinels Using the Laser-Induced Thermionic Vacuum Arc Method and Thermal Annealing Processes

et al. 2022

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“…From the pictures reported, the variations of the topography of the surface CTRL respect to TEST are noticeable. From the height panel, the Nanoscope analysis 1.8 software (Bruker, Milan, Italy) is able to evaluate the roughness [37]. The AFM observations have shown that the TEST group was characterized by an average roughness (Ra) of 109.6 ± 35.7 nm and 367 ± 116.9 nm (Ra) for the CTRL (Figure 1).…”

Section: Atomic Force Microscopy Measurementsmentioning

confidence: 99%

VEGF/VEGF-R/RUNX2 Upregulation in Human Periodontal Ligament Stem Cells Seeded on Dual Acid Etched Titanium Disk

et al. 2020

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In restorative dentistry, the main implants characteristic is the ability to promote the osseointegration process as the result of interaction between angiogenesis and osteogenesis events. On the other hand, implants cytocompatibility remains a necessary feature for the success of surgery. The purpose of the current study was to investigate the interaction between human periodontal stem cells and two different types of titanium surfaces, to verify their cytocompatibility and cell adhesion ability, and to detect osteogenic and angiogenic markers, trough cell viability assay (MTT), Confocal Laser Scanning Microscopy (CLSM), scanning electron microscopy (SEM), and gene expression (RT-PCR). The titanium surfaces, machined (CTRL) and dual acid etched (TEST), tested in culture with human periodontal ligament stem cells (hPDLSCs), were previously treated in two different ways, in order to evaluate the effects of CTRL and TEST and define the best implant surface. Furthermore, the average surface roughness (Ra) of both titanium surfaces, CTRL and TEST, has been assessed through atomic force microscopy (AFM). The vascular endothelial growth factor (VEGF) and Runt-related transcription factor 2 (RUNX2) expressions have been analyzed by RT-PCR, WB analysis, and confocal laser scanning microscopy. Data evidenced that the different morphology and topography of the TEST disk increased cell growth, cell adhesion, improved osteogenic and angiogenic events, as well osseointegration process. For this reason, the TEST surface was more biocompatible than the CTRL disk surface.

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“…[18] They include by Thermionic Vacuum Arc (TVA) Technology layers for fusion application, hard coatings, low-friction coatings, biomedicalapplicable films, materials for optoelectronics and for solid-state batteries. [19][20][21][22][23][24] The purpose of our work is to fabricate C-Ti multilayer nanostructures with certain mechanical and electrical properties determined by the content of TixCy and Ti phases Such nanostructures are relatively easy to obtain being essentially aletrnative layers of C and Ti deposited on the Si substrate at different temperature and bias voltages. The aim was highlight the TixCy and Ti phases by Raman measurements and electron microscopy as well as by coefficient of friction and electrical conductivity measurements.…”

Section: Introductionmentioning

confidence: 99%

NANOSTRUCTURED Ti-C THIN FILMS DEPOSITED BY THERMIONIC VACUUM ARC (TVA) TECHNOLOGY

CIUPINA¹,

Vladoiu²,

Lungu³

et al. 2022

AnnalsARSciPhysChem

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Nanostructured titanium-carbon nanostructured thin films were prepared using the Thermionic Vacuum Arc (TVA) technology in different configurations under a varied number of Ti/C combinations at high base pressure of 1 x 10-6Torr with and without graded compositions. The layers consisting of about lOOnm Carbon base layer and seven 40nm alternatively Ti and C layers were deposited on Silicon substrates. On the other hand, in order to obtain C-Ti multilayer structures with variable thickness and different percentages in C and Ti oflayers, a 20nm thick C layer was first deposed on Si substrate and then seven Ti-C layers, each ofthese having thickness of up to 40nm were deposed. To perform the successively layers with various thickness were changed the discharge parameters for C and Ti plasma sources to obtain the desirable thickness. By changing ofsubstrate temperature between room temperature and 300°C and on the other hand the bias voltage up to -700V, different batches of samples were obtained for this study. The films were characterized by surface morphology, and microstructure, through Rutherford Backscattering Spectrometry (RBS), Raman Spectroscopy, Transmission Electron Microscopy (TEM), Grazing Incidence X-ray diffraction (GIXRD). Tribological and electrical measurements are also presented.

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Synthesis and Characterization of Complex Nanostructured Thin Films Based on Titanium for Industrial Applications

Cited by 7 publications

References 23 publications

Synthesis of Cobalt–Nickel Aluminate Spinels Using the Laser-Induced Thermionic Vacuum Arc Method and Thermal Annealing Processes

Synthesis of Cobalt–Nickel Aluminate Spinels Using the Laser-Induced Thermionic Vacuum Arc Method and Thermal Annealing Processes

VEGF/VEGF-R/RUNX2 Upregulation in Human Periodontal Ligament Stem Cells Seeded on Dual Acid Etched Titanium Disk

NANOSTRUCTURED Ti-C THIN FILMS DEPOSITED BY THERMIONIC VACUUM ARC (TVA) TECHNOLOGY

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