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View article: Corrosion behavior of Zr-14Nb-5Ta-1Mo alloy in simulated body fluid
Corrosion behavior of Zr-14Nb-5Ta-1Mo alloy in simulated body fluid Open
Metals that are used to reconstruct skeletal structures often interfere with magnetic resonance imaging (MRI) owing to differences in magnetic susceptibility; consequently, metals with lower magnetic susceptibilities need to be developed f…
View article: Galvanic Corrosion among Ti-6Al-4V ELI Alloy, Co-Cr-Mo Alloy, 316L-Type Stainless Steel, and Zr-1Mo Alloy for Orthopedic Implants
Galvanic Corrosion among Ti-6Al-4V ELI Alloy, Co-Cr-Mo Alloy, 316L-Type Stainless Steel, and Zr-1Mo Alloy for Orthopedic Implants Open
In orthopedics, occasionally, different types of metals are used in applications in which they are in contact with each other. However, few studies have electrochemically investigated the galvanic corrosion of orthopedic implants formed of…
View article: Effect of Partial Substitution of Zr for Ti Solvent on Young’s Modulus, Strength, and Biocompatibility in Beta Ti Alloy
Effect of Partial Substitution of Zr for Ti Solvent on Young’s Modulus, Strength, and Biocompatibility in Beta Ti Alloy Open
In orthopedics and dentistry, there is an urgent need to obtain low-stiffness implants that suppress the stress shielding caused by the use of metallic implants. In this study, we aimed to fabricate alloys that can reduce the stiffness by …
View article: Electronic Structures of Passive Film Formed on Ti and Cr in a Phosphate Buffer Solution of pH 7
Electronic Structures of Passive Film Formed on Ti and Cr in a Phosphate Buffer Solution of pH 7 Open
The electronic structures, including the semiconductive properties, of the passive films formed on Cr and Ti in a phosphate buffer solution of pH 7 were evaluated using photoelectrochemical response, electrochemical impedance spectroscopy …
View article: Development of a Surface Treatment to Achieve Long-Lasting Antimicrobial Properties and Non-Cytotoxicity through Simultaneous Incorporation of Ag and Zn via Two-Step Micro-Arc Oxidation
Development of a Surface Treatment to Achieve Long-Lasting Antimicrobial Properties and Non-Cytotoxicity through Simultaneous Incorporation of Ag and Zn via Two-Step Micro-Arc Oxidation Open
A customized micro-arc oxidation (MAO) treatment technique was developed to obtain antibacterial properties with no toxicity on Ti surfaces. A two-step MAO treatment was used to fabricate a specimen containing both Ag and Zn in its surface…
View article: Galvanic Corrosion among Ti–6Al–4V ELI Alloy, Co–Cr–Mo Alloy, 316L-Type Stainless Steel, and Zr–1Mo Alloy for Orthopedic Implants
Galvanic Corrosion among Ti–6Al–4V ELI Alloy, Co–Cr–Mo Alloy, 316L-Type Stainless Steel, and Zr–1Mo Alloy for Orthopedic Implants Open
In orthopedics, occasionally, different types of metals are used in applications in which they are in contact with each other. However, few studies have electrochemically investigated the galvanic corrosion of orthopedic implants formed of…
View article: Band structures of passive films on titanium in simulated bioliquids determined by photoelectrochemical response: principle governing the biocompatibility
Band structures of passive films on titanium in simulated bioliquids determined by photoelectrochemical response: principle governing the biocompatibility Open
The band structures and band gap energies, Eg, of passive films formed on titanium (Ti) in simulated bioliquids, Hanks’ solution (Hanks) and saline, were evaluated. Ti was polarized at 0, −0.1, and −0.2 VAg/AgCl, Ef, for 1 h. After polariz…
View article: X‐ray photoelectron spectroscopy‐based valence band spectra of passive films on titanium
X‐ray photoelectron spectroscopy‐based valence band spectra of passive films on titanium Open
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 of passive films and that of the metallic Ti substrate. In …
View article: Band structures of passive films on titanium in simulated bioliquids determined by photoelectrochemical response: Principle governing the biocompatibility
Band structures of passive films on titanium in simulated bioliquids determined by photoelectrochemical response: Principle governing the biocompatibility Open
The band structures and band gap energies, Eg, of passive films formed on titanium (Ti) in simulated bioliquids, Hanks’ solution (Hanks) and saline, were evaluated. Ti was polarized at 0, −0.1, and −0.2 VAg/AgCl, Ef, for 1 h. After polariz…
View article: Band structures of passive films on titanium in simulated bioliquids determined by photoelectrochemical response: principle governing the biocompatibility
Band structures of passive films on titanium in simulated bioliquids determined by photoelectrochemical response: principle governing the biocompatibility Open
The band structures and band gap energies, Eg, of passive films formed on titanium (Ti) in simulated bioliquids, Hanks’ solution (Hanks) and saline, were evaluated. Ti was polarized at 0, −0.1, and −0.2 VAg/AgCl, Ef, for 1 h. After polariz…
View article: Development of Electrochemical Surface Treatment to Visualize Critical Corrosion-Inducing Inclusions of Zr in Chloride Environments
Development of Electrochemical Surface Treatment to Visualize Critical Corrosion-Inducing Inclusions of Zr in Chloride Environments Open
An electrochemical surface treatment was developed to visualize the corrosion-inducing inclusions of Zr in chloride environments. Pure Zr and Zr alloy (Zr–0.5O–0.5C) were evaluated in this study. The electrochemical surface treatment consi…
View article: Corrosion Behavior and Bacterial Viability on Different Surface States of Copper
Corrosion Behavior and Bacterial Viability on Different Surface States of Copper Open
本研究では大腸菌と表面化学状態の異なる銅(Cu)との相互作用を検討した.その結果,表面化学状態が主としてCu+の試料では,大腸菌によってCuイオン溶出が促進し,対照的に表面化学状態がCu2+の試料は,大腸菌による影響を受けなった.無菌溶液または細菌含有溶液浸漬前後の試料のXPS解析結果より,表面化学状態が主としてCu+の試料では,腐食生成物生成が大腸菌によって阻害されることが明らかとなった.
View article: Investigation of the Long-Term Antibacterial Properties of Titanium by Two-Step Micro-Arc Oxidation Treatment
Investigation of the Long-Term Antibacterial Properties of Titanium by Two-Step Micro-Arc Oxidation Treatment Open
Recently, biofilm formation caused by bacterial adhesion and colonization has been recognized as the major cause of failure in orthopedic and dental implant surgeries. In this study, a customized micro-arc oxidation (MAO) treatment techniq…
View article: Crystallographic texture- and grain boundary density-independent improvement of corrosion resistance in austenitic 316L stainless steel fabricated via laser powder bed fusion
Crystallographic texture- and grain boundary density-independent improvement of corrosion resistance in austenitic 316L stainless steel fabricated via laser powder bed fusion Open
Improvement of corrosion resistance of austenitic 316L stainless steel via laser powder bed fusion (LPBF) is currently a prominent research topic; however, the effects of crystallographic texture and the related grain boundary density on t…
View article: Development of Electrochemical Surface Treatment for Improvement of Localized Corrosion Resistance of Zirconium in Chloride Environment
Development of Electrochemical Surface Treatment for Improvement of Localized Corrosion Resistance of Zirconium in Chloride Environment Open
An electrochemical surface treatment technique was developed in this study to improve the localized corrosion resistance of zirconium in a chloride ion environment. A combination of anodic and cathodic polarization cycles was applied to in…
View article: Enhancement of antibacterial property of titanium by two-step micro arc oxidation treatment
Enhancement of antibacterial property of titanium by two-step micro arc oxidation treatment Open
A customized micro arc oxidation (MAO) treatment technique was developed to obtain desirable antibacterial properties on titanium surfaces. The two-step MAO treatment was applied to fabricate a specimen containing both Ag and Zn in its sur…
View article: Development of Electrochemical Surface Treatment for Improvement of Localized Corrosion Resistance of Zirconium in Chloride Environment
Development of Electrochemical Surface Treatment for Improvement of Localized Corrosion Resistance of Zirconium in Chloride Environment Open
塩化物イオン環境におけるZrの局部腐食発生を抑制する電気化学的表面処理方法を開発した．アノード／カソードサイクルによりZrの局部腐食を誘発する介在物の選択的除去を試みた．処理後の試料表面には介在物の溶解を示す浅いくぼみが観察された．高濃度のリン酸緩衝生理食塩水中で定電流アノードと定電位カソードの分極サイクルを行うことで，生理食塩水中の孔食電位は2 V以上まで上昇し，耐局部腐食性の大幅な向上が認められた．
View article: Effect of Impurity Elements on Localized Corrosion of Zirconium in Chloride Containing Environment
Effect of Impurity Elements on Localized Corrosion of Zirconium in Chloride Containing Environment Open
To clarify the mechanism of localized corrosion on zirconium in chloride environments, corrosion tests of zirconium and its alloys were performed using conventional and micron-scale measurement systems with surface areas of 0.35 cm 2 and l…
View article: Time-Transient Effects of Silver and Copper in the Porous Titanium Dioxide Layer on Antibacterial Properties
Time-Transient Effects of Silver and Copper in the Porous Titanium Dioxide Layer on Antibacterial Properties Open
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 the antibacterial effect and the surface change of the Ag- an…
View article: Corrosion Behavior and Bacterial Viability on Different Surface States of Copper
Corrosion Behavior and Bacterial Viability on Different Surface States of Copper Open
This study investigates the interaction between E. coli bacteria and various surface states of Cu. Pure Cu was oxidized at 298 K, 673 K, and 1273 K, and its surface chemical state was characterized using X-ray photoelectron spectroscopy. T…