A5083189086- Titanium Alloys Microstructure and Properties
- Bone Tissue Engineering Materials
- Orthopaedic implants and arthroplasty
- Microstructure and mechanical properties
- Advanced Thermoelectric Materials and Devices
- Nuclear Materials and Properties
- Advanced materials and composites
- Dental materials and restorations
- Metal and Thin Film Mechanics
- Hydrogen embrittlement and corrosion behaviors in metals
- Nanoparticles: synthesis and applications
- Thermal properties of materials
- Corrosion Behavior and Inhibition
- Topological Materials and Phenomena
- Aluminum Alloys Composites Properties
- Graphene and Nanomaterials Applications
- Additive Manufacturing Materials and Processes
- Surface Treatment and Coatings
- Intermetallics and Advanced Alloy Properties
- High Entropy Alloys Studies
- Mechanical stress and fatigue analysis
- Dental Implant Techniques and Outcomes
- Electron and X-Ray Spectroscopy Techniques
- Advanced ceramic materials synthesis
- Metal Alloys Wear and Properties
Tokyo Medical and Dental University
2014-2024
The University of Tokyo
2018-2024
Kobe University
2024
Seikei University
2023-2024
Kyushu University
2011-2018
Case Western Reserve University
2018
Cornell University
2018
Japan Society for the Promotion of Science
2012
Materials Science & Engineering
2011
Shimane University
2008-2010
Ultrafine-grained and heterostructured materials are currently of high interest due to their superior mechanical functional properties. Severe plastic deformation (SPD) is one the most effective methods produce such with unique microstructure-property relationships. In this review paper, after summarizing recent progress in developing various SPD for processing bulk, surface powder materials, main structural microstructural features SPD-processed explained including lattice defects, grain...
Improvement of corrosion resistance austenitic 316L stainless steel via laser powder bed fusion (LPBF) is currently a prominent research topic; however, the effects crystallographic texture and related grain boundary density on LPBF-fabricated parts have not been elucidated.For biomedical applications, control from single crystalline-like to randomly oriented polycrystalline microstructure highly attractive for optimizing mechanical properties (particularly Young's modulus) implants.An...
Abstract To clarify the effects of grid topographies with different scales on cell morphology and functionalization, we investigated adhesion differentiation human mesenchymal stem cells (hMSCs) to titanium surfaces micron, nano, micron/nano (hybrid) created by femtosecond laser irradiation. The results showed that cellular strongly depended topography. hMSCs cultured micron hybrid regulation plaques following surface topography were vinculin‐positive, whereas filamentous vinculin was...
Recently, the problem of infection on implanted devices caused by formation biofilms has been recognized. Surface treatment to prevent initial stages bacterial adhesion and subsequent growth is only possible solution against such infection. In this study, simple electrochemical was used for introducing silver, an antibiotic agent, titanium surface. A porous oxide layer containing small amounts silver formed metal substrate. This done microarc oxidation using electrolyte with nitrate. The...
Aluminum nanocomposites containing 30 vol%Al2O3 were produced by severe plastic deformation using high-pressure torsion (HPT). HPT was conducted at room temperature under a pressure of 6.0 GPa for disk samples (Disk-HPT) and 3.0 ring (Ring-HPT). For comparison, an alternate rotation (Cyclic-HPT) also adopted to check any difference in the microstructural development. Ring-HPT showed more uniform dispersion Al2O3 particles Al matrix higher hardness values than those obtained Disk-HPT....
The effects of Ti, Nb, Ta, Zr, and Ag on cellular bacterial adhesion were investigated in this study. Moreover, the relationships between surface compositions, metal ion release behaviors, biological responses examined. As a result, MC3T3-E1 cells S. aureus able to better attach Ti Zr rather than Nb Ta specimens. For specimen, amount ions released into Hanks’ solution was largest among all Cellular onto specimen inhibited compared with other specimens, because release. Alternatively,...
This study investigated the efficacy of copper (Cu) as an antibacterial element incorporated on titanium (Ti) surface by electrochemical treatment. Cu was onto Ti micro-arc oxidation (MAO). A small amount into oxide layer and found to be in oxidized states. Cu-incorporated samples exhibited no-harmful effect proliferation osteoblastlike cells. Moreover, difference property between fresh incubated evaluated using gram-positive gram-negative facultative anaerobic bacteria. The specific were...
This study investigated the time transient effect of zinc (Zn) in porous titanium dioxide formed by micro-arc oxidation (MAO) treatment routinely performed for Zn-containing electrolytes. The aim our analysis was to understand changes both chemical and biological properties Zn physiological saline. morphology Zn-incorporated MAO surface did not change, a small amount ions were released at early stages incubation We observed decrease concentration oxide layer because its release state (Zn2+...
Recently, silver (Ag) and copper (Cu) have been incorporated into a titanium (Ti) surface to realize their antibacterial property. This study investigated both the durability of effect change Ag- Cu-incorporated porous dioxide (TiO
Abstract Ti-6Al-7Nb was deformed by high-pressure torsion to improve the mechanical properties of alloy. conducted at room temperature under pressures 2 and 6 GPa for disk-shaped specimens. Microstructure characterized transmission electron microscopy (TEM) X-ray diffraction analysis (XRD). Mechanical were evaluated tensile test Vickers microhardness measurement. The grain size refined about 100 nm after processing through 5 revolutions. Hardness increased with straining values higher than...
Air-formed surface oxide films on four types of Co-Cr- alloys were characterized using X-ray photoelectron spectroscopy (XPS) and five Co-Cr anodically polarized, to identify the effects addition N, Mo, W containing high Cr composition corrosion resistance. Co-20Cr-15W-10Ni (ASTM F90), Co-30Cr-6Mo, Co-33Cr-5Mo-0.3N, Co-33Cr-9W-0.3N employed for XPS above another Co-30Cr-6Mo F75) anodic polarization. The film consisted species Co, Cr, and/or Ni contains a large amount OH− with thickness...
To clarify the effects of micron/submicron hybrid topography on cell morphology and functionalization, we investigated adhesion differentiation human mesenchymal stem cells (hMSCs) to titanium (Ti) surfaces with three different topographies: micron, submicron, grooves created using a femtosecond laser. hMSCs cultured Ti specimens showed high alignment micron after 6 h incubation, whereas attached submicron were elongated. An examination vinculin-positive plaques indicated that affected...
In this study, micro-arc oxidation (MAO) was performed on a β-type titanium alloy, namely, Ti-29Nb-13Ta-4.6Zr alloy (TNTZ), to improve not only its antibacterial property but also bioactivity in body fluids. The surface oxide layer formed TNTZ by MAO treatment mixture of calcium glycerophosphate, acetate, and silver nitrate characterized using analyses. resulting porous mainly composed oxide, it contained calcium, phosphorus, small amount silver, all which were incorporated from the...
Titanium (Ti) is always covered by thin passive films. Thus, valence band (VB) spectra, obtained using X‐ray photoelectron spectroscopy (XPS), are superpositions of the VB spectra films and that metallic Ti substrate. In this study, to obtain only films, angular resolution (for eliminating substrate contribution) argon ion sputtering removing films) were used along with XPS. The film on was determined consist a very TiO 2 layer small amounts O 3 , TiO, hydroxyl groups, water thickness 5.9...
One cause of the excellent hard‐tissue compatibility Ti and alloys compared with other metals is their ability to form calcium phosphate in biological environments. This confirmed by many studies, although formation mechanism has not been completely elucidated. In this study, elucidate initial kinetics on human body, was immersed a simulated body fluid, Hanks' solution, for 10 0 –10 6 s, followed precise characterization using XPS. specimens diluted solutions were also characterized. The...
A customized micro arc oxidation (MAO) treatment technique was developed to obtain desirable antibacterial properties on titanium surfaces. The two-step MAO applied fabricate a specimen containing both Ag and Zn in its surface oxide layer. Surface analyses metal-ion release tests were performed evaluate the presence of ion behavior for simulating practical usage, respectively. Additionally, specimens also evaluated using gram-negative facultative anaerobic bacteria. MAO-treated showed...
For the elucidation of mechanism calcium phosphate formation on commercially pure titanium (CP Ti) in human body, rutile TiO2 single crystal plates with (001), (110), and (111) facets, namely, TiO2(001), TiO2(110), TiO2(111), polycrystalline (TiO2(poly)) were immersed a simulated body fluid, Hanks' solution (Hanks), for 100–105 s, adsorption ions was precisely characterized employing X-ray photoelectron spectroscopy (XPS). Previously published CP Ti data used comparison. Prior to immersion...
Recently, biofilm formation caused by bacterial adhesion and colonization has been recognized as the major cause of failure in orthopedic dental implant surgeries. In this study, a customized micro-arc oxidation (MAO) treatment technique was developed to obtain desirable antibacterial properties on Ti surfaces. The two-step MAO applied fabrication specimens with Ag with/without Zn their surface oxide layer. order simulate practical usage, analyses immersion tests were performed evaluate...