Development of Hydroxyapatite Thin Film on Titanium Substrate by Electrophoretic Deposition

2005 ◽  
Vol 284-286 ◽  
pp. 901-904 ◽  
Author(s):  
Chang Kuk You ◽  
Xian Wei Meng ◽  
Tae Yub Kwon ◽  
Yu Zhong Yang ◽  
J.L. Ong ◽  
...  
Keyword(s):  
Electrophoretic Deposition ◽  
Coating Thickness ◽  
Applied Voltage ◽  
Counter Electrode ◽  
Coating Layer ◽  
Sol Gel ◽  
Titanium Substrate ◽  
Powder Concentration ◽  
Ha Coating ◽  
Nano Size

Electrophoretic deposition was used for HA coating on dental implants with different coating thickness. The HA coating thickness was examined in terms of applied voltage and time, and powder concentration in suspension. Nano-size HA and SiO2-CaO-P2O5-B2O3 bioglass powders were synthesized by sol-gel method. Polyvinyl alcohol (3 wt%) as a binder was resolved in ethyl alcohol, then, nano HA powder was dispersed ultrasonically in the mixture for 15 min and pH was adjusted with HNO3 for positive charging on particle. Titanium substrate was held on cathode and counter electrode was platinum. HA with 0.5 % and 0.03 % of powder concentration was deposited electrophoretically at 10~20 V for 1~20 minutes. The thickness of as-deposited HA layer decreased from nearly 80 µm (0.5 %, 20 V, 10 min) to 4~5 µm (0.03%, 10V, 1 min) as powder concentration, applied voltage and time decreased, respectively. The surface of HA coating layer deposited in lower powder concentration showed much more homogeneous and relatively dense morphology, in contrast, the surface in thick suspension became rough or porous and was easily spalled. In a co-deposition of HA and bioglass, co-deposited glass played an important role in increasing bonding strength between coating layer and substrate. It is believed that electrophoretic deposition method can be one of alternatives for relatively thin and easy HA coating.

Preparation and Characterization of BaTiO3 Powders by Sol-Gel and BaTiO3 Ferroelectric Films by Electrophoretic Deposition Technique

2007 ◽  
Vol 280-283 ◽  
pp. 617-622
Author(s):  
Ya Lu Ma ◽  
Hong Long Zhu ◽  
Jian Lin Li
Keyword(s):  
Electrophoretic Deposition ◽  
Ph Value ◽  
Sol Gel ◽  
Transition Process ◽  
Deposition Technique ◽  
Ferroelectric Films ◽  
Electrical Field Strength ◽  
Powder Concentration ◽  
Sol Gel Transition ◽  
Gel Transition

The clear and transparent sols of BaTi acetate were prepared from tetrabutyltitanate, barium acetate aqueous solution, ethanol and acetic acid. The BaTi acetate sols were transferred into gels by sol-gel process, and the gels were dried and calcined to nanostructured BaTiO3 powders. Pure barium titanate powders added in mixtures of acetone and iodine and water or acetylacetone (Acac) and ethanol (EtOH) as suspension systems, the aim of this study was to use the electrophoretic deposition technique (EPD) to fabrication the BaTiO3 ferroelectric films with high dielectric constant. During sol-gel transition process, it is found that the initial PH value of sol affected not only the sol-gel transition, but also the particles size of the final calcined BaTiO3 powders. The effects of the EPD process parameters such as the suspension, powder concentration, electrical field strength on the specific EPD deposited weight were investigated. The films sintered at 1050°C for 2h were crystallized into the tetragonal phase at room temperature, which were sufficiently dense and had uniform microstructure and excellent dielectric properties.

Electrophoretic Deposition Mechanism of Mesoporous Silica Powder in Acetone

2009 ◽  
Vol 412 ◽  
pp. 131-136 ◽  
Author(s):  
Ai Miyamoto ◽  
Hideyuki Negishi ◽  
Akira Endo ◽  
Bao Wang Lu ◽  
Keiji Sakaki ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Electrophoretic Deposition ◽  
Current Density ◽  
Counter Electrode ◽  
Cooling System ◽  
Deposition Mechanism ◽  
Dc Voltage ◽  
Powder Concentration ◽  
Deposition Electrode ◽  
Deposition Substrate

The preparation of a thick coating of mesoporous silica (MPS) on metal substrates by electrophoretic deposition (EPD) has been studied for application to an advanced desiccant cooling system. In this study, we investigated the EPD mechanism of MPS in acetone under a constant applied voltage for the fabrication of a thick MPS coating. We consider that the main contributors to the resistance between the deposition electrode and the counter electrode are the deposited MPS layer and the EPD bath. The current density was measured during EPD under a constant applied DC voltage. The current density decreased as the EPD progressed, and the resistance increased between the electrodes. The AC impedance between the deposition substrate and the counter electrode was measured in the range of 10 Hz-80 kHz. We observed a single semicircle in the impedance plots.　 We investigated the influence of the MPS powder concentration of the EPD bath and the amount of deposition layer on the total resistance. We found that the resistance caused by forming the MPS layer increased as EPD progressed whereas the resistance of EPD bath was almost constant through the EPD process. Moreover, we determined the EPD mechanism of MPS powder in acetone.

Electrophoretic Deposition of Biocomposite Lignin/Hydroxyapatite Coatings on Titanium

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Sanja Erakovic ◽  
Djordje Veljovic ◽  
Papa Niokhor Diouf ◽  
Tatjana Stevanovic ◽  
Miodrag Mitric ◽  
...  
Keyword(s):  
Electrophoretic Deposition ◽  
Applied Voltage ◽  
Photoelectron Spectroscopy ◽  
Composite Coatings ◽  
Substrate Surface ◽  
Titanium Substrate ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
X Ray ◽  
Hydroxyapatite Coatings

In this work, electrophoretic deposition (EPD) was applied to obtain novel hydroxyapatite (HAP)/lignin (Lig) biocomposite coatings on titanium substrate. Nanosized hydroxyapatite powder, prepared by using the modified chemical precipitation method, was used for the fabrication of HAP/Lig composite coatings. EPD was performed at different values of constant voltage and constant deposition time. It was confirmed that control over deposited mass can be achieved by applied voltage and time. The uniform and compact coatings were successfully deposited at applied voltage of 60 V in various deposition times lower than 1 minute. The effect of lignin as natural non-toxic polymer on microstructure, morphology and thermal behavior of biocomposite HAP/Lig coatings was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The electrophoretically deposited HAP/Lig coating has been successfully sintered at lower sintering temperature of 900°C, producing non-fractured coating and indicating that lignin may exhibit adhesive role, strengthening the bonding between HAP particles and substrate surface.

Electrophoretic Deposition Performance of Hydroxyapatite Coating on Titanium Alloys for Orthopedic Implant Application

2020 ◽  
Vol 1000 ◽  
pp. 69-81
Author(s):  
Nuzul Ficky Nuswantoro ◽  
Dian Juliadmi ◽  
Hidayatul Fajri ◽  
Menkher Manjas ◽  
Netti Suharti ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Titanium Alloys ◽  
Electrophoretic Deposition ◽  
Coating Layer ◽  
Low Cost ◽  
Titanium Implant ◽  
Orthopedic Implants ◽  
Metal Implants ◽  
Ha Coating ◽  
Coating Time

Hydroxyapatite (HA) is potentially used as a coating material for titanium alloys to improve their bioactivity and then enhancing the osseointegration characteristic of metal implants for orthopedic application. Electrophoretic Deposition (EPD), one of the coating methods that is widely applied for coating metal because of its simplicity and relatively low cost, is chosen for coating metal implants. HA coating layer quality can be controlled by adjusting applied voltages and coating time of the EPD process. However, the optimum voltage and exposing time has not yet been known for new type titanium implant such as Ti-12Cr and TNTZ. This work is, therefore, focusing on the effect of applied voltage and coating time on the mass growth, HA coating thickness, and surface coverage that can be produced on the surfaces of both alloys, and also on the conventional titanium alloy, Ti6Al4V, for comparison. The result of this work showed that there is a significant influence of the titanium alloy type on the HA layer performances. However, it is necessary to choose a suitable voltage and to expose time for producing a sufficient coating layer that meets the standard of orthopedic implants.

Fabrication of Hydroxyapatite Coating on Commercially Pure Ti by Electrophoretic Deposition Technique

2020 ◽  
Vol 860 ◽  
pp. 239-243
Author(s):  
Sri Rahmadani ◽  
Anawati Anawati ◽  
I. Nyoman Jujur ◽  
Razie Hanafi
Keyword(s):  
Electrophoretic Deposition ◽  
Applied Voltage ◽  
Processing Parameters ◽  
Optical Microscope ◽  
Average Thickness ◽  
Current Output ◽  
Biomedical Implant ◽  
Ha Coating ◽  
Commercially Pure ◽  
Crack Layer

Hydroxyapatite (HA) coating was deposited on commercially pure Ti to improve its biocompatibility as a biomedical implant material. The HA layer was deposited by the electrophoretic deposition (EPD) method. The processing parameters controlled the HA structure. In this research, the applied voltage was varied 20, 30, and 40 V to optimize a free-crack layer. The current output during EPD at 20 V was in the order of 10-5 A/cm2. A higher current density in the order of 10-4 A/cm2 was obtained at 30 and 40 V. The coating formed at 20 V was relatively free of crack. A high number of cracks began to observe in the layer formed at 30 V, while only a few cracks were revealed on the layer formed at 40 V. The average thickness of the HA layer increased slightly with applied voltage. The thickness was approximately 40±5 µm, as observed by an optical microscope. The optimum voltage to produce a thick HA layer with a small number of cracks was at 40 V.

Effect of Deposition Voltage on Microstructure and Optical Properties of TiO2 Thin Film via Electrophoretic Deposition

2012 ◽  
Vol 576 ◽  
pp. 586-589 ◽  
Author(s):  
Saber Ghannadi ◽  
H. Abdizadeh ◽  
M. Golobostanfard
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Electrophoretic Deposition ◽  
Applied Voltage ◽  
Sol Gel ◽  
Visible Region ◽  
Diffraction Field ◽  
Tio2 Thin Films ◽  
Vis Spectroscopy ◽  
Titania Sol

In this study nanocrystalline anatase TiO2 thin films were prepared by electrophoretic deposition of titania sol at various applied voltages. The well-known sol-gel method was used to prepare the titania sol. The influence of applied voltage on the structure, morphology and optical properties of thin films has been characterized by X-ray diffraction, field emission scanning electron microscopy and UV-Vis spectroscopy. The results show that the thickness of the films formed on the substrate increases with increasing the applied voltage. However, with increasing the thickness of the films, the cracks increased and the transparency reduced in the visible region.

Different Morphology of Hydroxyapatite Coatings on Titanium by Electrophoretic Deposition

2007 ◽  
Vol 330-332 ◽  
pp. 609-612 ◽  
Author(s):  
Xian Wei Meng ◽  
Tae Yub Kwon ◽  
Kyo Han Kim
Keyword(s):  
Electrophoretic Deposition ◽  
Applied Voltage ◽  
Deposition Time ◽  
Concentration Level ◽  
Processing Parameters ◽  
Optimal Conditions ◽  
Polycrystalline Structure ◽  
Ha Coating ◽  
Hydroxyapatite Coatings

The objective of the present study was to define the optimal conditions and characterizations of hydroxyapatite (HA) coatings on titanium by electrophoretic deposition (EPD). The EPD processing parameters, such as deposition time, HA concentration level in the suspension, and applied voltage are experimentally determined. A good packing, crack-free and uniform HA coating on titanium was prepared. Then the coatings were sintered at 800 °C for 2 h. The sintered coatings presented a very homogeneous polycrystalline structure free of cracks. The results show that the application of EPD is an effective method in obtaining HA coatings with good properties.

scholarly journals Development of Adhesive, Bioactive and Antibacterial Titania Sol-Gel Coating on Titanium Substrate by Dip-Coating Technique

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 243
Author(s):  
Diana Horkavcová ◽  
Quentin Doubet ◽  
Gisèle Laure Lecomte-Nana ◽  
Eva Jablonská ◽  
Aleš Helebrant
Keyword(s):  
Simulated Body Fluid ◽  
Body Fluid ◽  
Sol Gel ◽  
Titanium Substrate ◽  
Dip Coating ◽  
Coating Technique ◽  
Metal Implants ◽  
Excellent Adhesion ◽  
Titania Sol ◽  
Dip Coating Technique

The sol-gel method provides a wide variety of applications in the medical field. One of these applications is the formation of coatings on the metal implants. The coatings containing specific additive can enhance or improve the existing surface properties of the substrate. In this work, titania sol-gel coatings were doped with two forms of silver (AgNO3, Ag3PO4) and synthetic hydroxyapatite and applied on the titanium samples by dip-coating technique. After drying and slow firing, all coatings were characterized with scanning electron microscopy. Thin coatings were successfully prepared with excellent adhesion to the substrate (measured by ASTM D 3359-2), despite cracks. Coatings containing silver and hydroxyapatite demonstrated a 100% antibacterial effect against Escherichia coli after 24 h. The bioactivity of the coatings containing hydroxyapatite tested in modified simulated body fluid under static-dynamic conditions was confirmed by bone-like hydroxyapatite precipitation. To better understand the interaction of the coatings with simulated body fluid (SBF), changes of Ca2+ and (PO4)3− ions concentrations and pH values were studied.

Effect of Calcinations on Characterizations of Fabricated Nano Manganese Ferrite

2013 ◽  
Vol 634-638 ◽  
pp. 2150-2154 ◽  
Author(s):  
Rita Sundari ◽  
Tang Ing Hua ◽  
M. Rusli Yosfiah
Keyword(s):  
Sol Gel ◽  
Volatile Components ◽  
Manganese Ferrite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Reflectance Analysis ◽  
Transmission Electron Microscope Analysis ◽  
Electron Microscope Analysis ◽  
Nano Size

A citric acid anionic surfactant has been applied for nano manganese ferrite (MnFeO3) fabrication using sol gel method. The calcinations have been varied for 300, 600 and 800oC. The UVDR (UV-Vis Diffused Reflectance) analysis shows a high absorptive band gap after 400 nm for the 600oC calcinated MnFeO3. The DTA (Differential Thermal Analysis) profiles exhibit remarkably trapped volatile matters (H2O, CO2, and NO2) in the fabricated MnFeO3 under sol gel heat treatment at 100oC and the peaks disappeared as the calcination increased to 600oC. As the temperature elevated from 100 to 300oC, the absorption peaks of volatile components are disappeared as demonstrated clearly by the FTIR (Fourier Transform Infrared) spectra of the fabricated material, which 3393 cm-1 corresponded to OH group, 1624 cm-1 to CO group, and 1384 cm-1 to NO group. The XRD (X-Ray Diffraction) spectra show clearly the alteration process from amorphous to crystalline structure as the calcinations increased from 300 to 600oC. In addition, the TEM (Transmission Electron Microscope) analysis exhibits parts of the fabricated MnFeO3 found in cubic nano size of 15-40 nm under interested calcinations and the result is in agreement with that obtained by XRD investigation.

Sol–gel synthesis and sintering of nano-size Li2TiO3 powder

2008 ◽  
Vol 62 (6-7) ◽  
pp. 837-839 ◽  
Author(s):  
Xiangwei Wu ◽  
Zhaoyin Wen ◽  
Bin Lin ◽  
Xiaogang Xu
Keyword(s):  
Sol Gel ◽  
Sol Gel Synthesis ◽  
Nano Size
Sign in / Sign up

Export Citation Format

Share Document