Structure Control of Bioactive Titanate Nanomesh Layers Fabricated on Laser Irradiated Ti-based Bulk Metallic Glass using Hydrothermal-Electrochemical Method

2011 ◽  
Vol 1316 ◽  
Author(s):  
Sayaka Maruyama ◽  
Naota Sugiyama ◽  
Masahiro Yoshimura ◽  
Togo Shinonaga ◽  
Masahiro Tsukamoto ◽  
...  
Keyword(s):  
Simulated Body Fluid ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Electrolyte Solution ◽  
Current Density ◽  
Electrochemical Method ◽  
Body Fluid ◽  
Structure Control ◽  
Hydrothermal Electrochemical Method

ABSTRACTThe surface of Ti-based bulk metallic glass (BMG) was irradiated by the femto-second laser and microgrooves were formed on the surface. The titanate nanomesh layers were fabricated on the micro-grooved BMG surface by hydrothermal-electrochemical (H-E) treatment changing the conditions of the concentration of electrolyte solution (0 and 5 M) and applying current density (0-200 mA/cm2). The bone-inducing capacity of the samples with different H-E treatment was confirmed by soaking them in a simulated body fluid for 12 days. The H-E treatment in higher concentration 5 M NaOH aq. and applying higher current density above 0.5 mA/cm2 exhibited excellent bioactivity inducing large hydroxyapatite crystallites.

Apatite Forming Ability of Bulk Metallic Glass Surface via Hydrothermal Treatment

2007 ◽  
Vol 361-363 ◽  
pp. 249-252
Author(s):  
Takamasa Onoki ◽  
Xin Min Wang ◽  
Sheng Li Zhu ◽  
Yasuto Hoshikawa ◽  
Naota Sugiyama ◽  
...  
Keyword(s):  
Simulated Body Fluid ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Hydrothermal Treatment ◽  
Powder Mixture ◽  
Hot Pressing ◽  
Glass Surface ◽  
Body Fluid ◽  
New Type

Apatite forming and bonding ability of Ti based bulk metallic glass ((Ti0.40Zr0.10Cu0.36Pd0.14)99Ca1: BMG) were investigated as a new type of biomaterials. Powder mixture of CaHPO4･2H2O and Ca(OH)2 and the BMG disks were treated with autoclave for hydrothermal hot-pressing simultaneously (150°C, 40MPa). And then the BMG disks were soaked in simulated body fluid (SBF, Kokubo solution). Apatite were deposited and covered on the surface of the BMG. It was firstly demonstrated that surface of Ti based bulk metallic glass could be revealed apatite forming ability.

scholarly journals Flexible diamond-like carbon film prepared by hydrothermal electrochemical method

2017 ◽  
Vol 35 (3) ◽  
pp. 447-453
Author(s):  
Ying Tao ◽  
Danqin Yi ◽  
Baojun Zhu ◽  
Wenpeng Cao
Keyword(s):  
Current Density ◽  
Electrochemical Method ◽  
Carbon Film ◽  
Reflectance Spectroscopy ◽  
Internal Stresses ◽  
Diamond Like Carbon ◽  
One Step ◽  
Hydrothermal Electrochemical Method ◽  
A Current

AbstractDiamond-like carbon (DLC) thin films were prepared by hydrothermal electrochemical method in one-step process. The structural characterization of these films was carried out by scanning electron microscopy (SEM), Raman spectroscopy, and infrared reflectance spectroscopy (IR). It was found that there was an increased sp2 carbon content but decreased sp3 carbon and hydrogen contents with an increase in current density. The flexibility and internal stresses of the DLC films were affected by hydrogen, sp3 amorphous carbon and ordered crystalline sp2 carbon contents. The highly flexible DLC films with high sp3 carbon and hydrogen contents were prepared at a current density of 0.001 mA/cm2.

Corrosion Resistance of Mg-4Zn Alloy with Amorphous Micro-Arc Oxidation Coating in Simulated Body Fluid

2016 ◽  
Vol 852 ◽  
pp. 1325-1333
Author(s):  
Li Chen Zhao ◽  
Shuang Jin Liu ◽  
Yu Min Qi ◽  
Chun Xiang Cui
Keyword(s):  
Corrosion Resistance ◽  
Simulated Body Fluid ◽  
Current Density ◽  
Polarization Resistance ◽  
Body Fluid ◽  
Corrosion Current Density ◽  
Corrosion Current ◽  
Metal Substrate ◽  
Electrochemical Measurements ◽  
Micro Arc Oxidation

A binary Mg-4Zn alloy was fabricated as a potential degradable biomaterial. To improve the corrosion resistance of Mg-4Zn alloy, an amorphous micro-arc oxidation (MAO) coating was prepared on the Mg-4Zn substrate. Electrochemical measurements and immersion tests were employed to evaluate the corrosion resistance of the specimen in simulated body fluid (SBF). Electrochemical measurements show that the Mg-4Zn alloy covered with a MAO coating has a much lower corrosion current density and a much greater polarization resistance. Immersion tests suggest that the degradation of Mg-4Zn substrate is relatively serious during the initial 8 h of immersion although it has been protected by a MAO coating. When most micro-pores within the MAO coating have been filled with precipitates resulted from the corrosion of the metal substrate, the degradation of the Mg-4Zn substrate is significantly delayed.

Stress-assisted-electrochemical corrosion of Cu-based bulk metallic glass

2010 ◽  
Vol 25 (3) ◽  
pp. 592-597 ◽  
Author(s):  
Ding Li ◽  
Mimi Yang ◽  
Fuqian Yang ◽  
Peter K. Liaw
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Current Density ◽  
Deformation Zone ◽  
Shear Banding ◽  
Shear Bands ◽  
Electrochemical Corrosion ◽  
Indentation Load ◽  
Localized Deformation ◽  
Load Range

Using the microindentation test, the stress-assisted-electrochemical corrosion of Cu46.25Zr45.25Al7.5Er1 bulk metallic glass (BMG) was studied in a 10 wt% NaCl electrolyte. The microindentation was performed in an indentation load range of 500 to 4000 mN to create shear bands over the deformation zone. Electric current of various densities was passed through the indented BMGs to evaluate the effect of shear bands and localized deformation on the electrochemical corrosion of the BMGs. Surface pits always initiated from the shear-banding zone and the contact edges between the indenter and the BMGs, and the size of the corroded zone grew with the increase in the polarization time, the indentation load, and the current density. Wormlike amorphous whiskers were formed over the corroded zone, and the density of the wormlike whiskers increased with the current density and polarization time.

Electrovector Effect of Polarized and Chemically Treated Na2O-CaO-P2O5-SiO2-Al2O3 Bioglasses

2006 ◽  
Vol 309-311 ◽  
pp. 337-340
Author(s):  
Taketo Sasaki ◽  
Masahiro Kobayashi ◽  
Satoshi Nakamura ◽  
Kimihiro Yamashita
Keyword(s):  
Simulated Body Fluid ◽  
Current Density ◽  
Chemical Treatment ◽  
Body Fluid ◽  
Complex Impedance ◽  
Immersion Test ◽  
Depolarization Current ◽  
Impedance Measurements ◽  
Electrical Conductivities ◽  
Thermally Stimulated Depolarization

Na2O-CaO-P2O5-SiO2-Al2O3 (NCPSA) glass was investigated in its electrical polarizability by complex impedance and thermally stimulated depolarization current (TSDC) measurements. Moreover, the NCPSA glass was also subjected to a chemical treatment for bioactivity improvement. The effects of the electrical polarization and the chemical treatment on apatite formability of NCPSA glass were investigated by immersion test using simulated body fluid. From the result of complex impedance measurements, the activation energies for electrical conductivities NCPSA glass was 1.1eV. From the TSDC measurements, the polarized NCPSA glass showed monotonically increasing curves in depolarization current density spectra. The stored electrical charge calculated from TSDC measurements of the NCPSA glass polarized with electrical dc field of 2kV･cm-1 at 600°C for 1h was 4.91 mC･cm-2. The NCPSA glass treated with 1M NaOH indicated apatite formability in SBF and exhibited bioactivity. We disclosed that the combination of electropolarization and chemical treatment changed the apatite formability of the NCPSA glass in SBF, consequently, improved the bioactivity of the glass.

Electrovector Effect of Polarized Porous Hydroxyapatite Ceramics

2006 ◽  
Vol 309-311 ◽  
pp. 1043-1046
Author(s):  
Chikako Ikeda ◽  
Mikihiro Ueki ◽  
Satoshi Nakamura ◽  
Takayuki Kobayashi ◽  
Kimihiro Yamashita
Keyword(s):  
Simulated Body Fluid ◽  
Porous Structure ◽  
Electric Current ◽  
Current Density ◽  
Body Fluid ◽  
Electric Current Density ◽  
Porous Hydroxyapatite ◽  
Hydroxyapatite Ceramics ◽  
Scaffold Materials ◽  
Current Densities

Porous HA ceramics has been developed for the scaffold materials because the porous structure has been recognized to be necessary to invasion of body fluid and ingrowth of bone. The synthesized porous HA ceramics with several porosities were electrically polarized, and then the TSDC spectra were measured. The maximum electric current density and the stored polarization charges decreased with increasing the porosity. Therefore it was thought that the decreasing the amount of proton of porous HA ceramics was one of the reasons of decreasing of the maximum electric current densities and the stored charges. The simulated body fluid (SBF) test implied that electrovector effects enhanced the apatite formabilities.

Sign in / Sign up

Export Citation Format

Share Document