Electrophoretic Deposition of Natural Hydroxyapatite

2009 ◽  
Vol 412 ◽  
pp. 183-188
Author(s):  
Mehdi Javidi ◽  
Sirus Javadpour ◽  
Mohammad Ebrahim Bahrololoom ◽  
Jan Ma
Keyword(s):  
Zeta Potential ◽  
Electrophoretic Deposition ◽  
Applied Voltage ◽  
Deposition Time ◽  
316L Stainless Steel ◽  
Deposition Process ◽  
Dispersing Agent ◽  
Coating Efficiency ◽  
The Stability ◽  
Natural Hydroxyapatite

Natural hydroxyapatite has been electrophoretically deposited on medical grade 316L stainless steel. Stable suspensions were prepared by mixing 40 g/L milled natural hydroxyapatite powder in isopropyl alcohol and stabilized by polyethylenimine as dispersing agent and binder. The stability of suspensions was investigated by measuring zeta potential. It was found here that the suspension which was stabilized with 4 g/L polyethylenimine revealed a high value of zeta potential and stability. Deposition was achieved on the cathode at constant voltages of 30, 60, and 90 V for 1 to 5 minutes. After deposition, the samples were dried at room temperature for 24 hours and deposition weight, roughness, and thickness of the coatings were measured. The surface morphology of the coated samples was studied by a scanning electron microscope. The results of the electrophoretic deposition process showed that the sample coated at 60 V and 3 minutes led to an adherent, continuous, and crack-free coating. The coating efficiency and thickness increased with increasing deposition time and yielded to saturation at the constant applied voltage. Also, the current density decreased and yielded to saturation at the constant applied voltage during electrophoretic deposition.

How Electrophoretic Deposition with Ligand-Free Platinum Nanoparticles Affects Contact Angle

2015 ◽  
Vol 654 ◽  
pp. 218-223 ◽  
Author(s):  
Alexander Heinemann ◽  
Sven Koenen ◽  
Kerstin Schwabe ◽  
Christoph Rehbock ◽  
Stephan Barcikowski
Keyword(s):  
Contact Angle ◽  
Electrophoretic Deposition ◽  
Platinum Nanoparticles ◽  
Deposition Time ◽  
Deposition Process ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Ligand Free ◽  
Vital Parameters ◽  
Scanning Electron

Electrophoretic deposition of ligand-free platinum nanoparticles has been studied to elucidate how wettability, indicated by contact angle measurements, is linked to vital parameters of the electrophoretic deposition process. These parameters, namely the colloid concentration, electric field strength and deposition time, have been systematically varied in order to determine their influence on the contact angle. Additionally, scanning electron microscopy has been used to confirm the homogeneity of the achieved coatings.

Thin Films of Europium (III) Doped-TiO2 Prepared by Electrophoretic Deposition from Nanoparticulate Sols

2012 ◽  
Vol 507 ◽  
pp. 73-77 ◽  
Author(s):  
Mario Borlaf ◽  
Maria Teresa Colomer ◽  
Howard Titzel ◽  
James H. Dickerson ◽  
Rodrigo Moreno
Keyword(s):  
Thin Films ◽  
Zeta Potential ◽  
Electrophoretic Deposition ◽  
Colloidal Stability ◽  
Sol Gel ◽  
Complete Characterization ◽  
Constant Current ◽  
Molar Ratio ◽  
Versatile Technique ◽  
The Stability

Colloidal sol-gel is a common method used for the preparation of stable and homogeneous sols and thin films. The nanoparticulate sols can be easily deposited by EPD, which is a versatile technique for producing denser and thicker coatings than those produced by other techniques like dipping. A complete characterization of the sols, such as colloidal stability and electrophoretic mobility, which can be determined through zeta potential measurements, as well as the influence of deflocculants in the surface properties, is needed before using electrophoretic deposition. In this work, we have prepared sols of TiO2with an alkoxide:water molar ratio of 50:1 and Eu (III) doped-TiO2(2 mole % Eu (III)) using as precursors titanium (IV) isopropoxide and europium (III) acetate hydrate, respectively. The stability of the particulate sols was studied in terms of conductivity, zeta potential and viscosity evolution. Anatase stable sols, after peptization and without the use of any additive, were deposited on stainless steel substrates by electrophoretic deposition under both constant current and constant voltage conditions. Using different intensities and deposition times we have obtained thin films with different features (thicknesses and morphology) and different optical properties. The presence of europium (III) increases particle size, viscosity and peptization time and decreases the band gap of TiO2.

Triethanolamine as an Additive in the Electrophoretic Deposition of TiTe3O8 Thick Films

2012 ◽  
Vol 507 ◽  
pp. 27-34
Author(s):  
Xin Ming Su ◽  
Ai Ying Wu ◽  
Paula M. Vilarinho
Keyword(s):  
Zeta Potential ◽  
Electrophoretic Deposition ◽  
Uv Light ◽  
Thick Films ◽  
Solid State Reaction Method ◽  
Conventional Solid State Reaction ◽  
Si Substrates ◽  
Improved Stability ◽  
The Stability

A successful electrophoretic deposition (EPD) markedly depends on the stability of the suspension. In this study the role of Triethanolamine (TEA) as a stabilizer in EPD of thick films of TiTe3O8 is presented. TiTe3O8 powders were synthesized via a conventional solid-state-reaction method and dispersed in acetone with and without TEA. The stability of the suspensions was addressed by zeta-potential, UV light and FTIR measurements. The specific adsorption of TEA to TiTe3O8 particles results in a high zeta potential and improved stability of the suspensions, allowing the preparation of high quality TiTe3O8 thick films on Pt coated Si substrates. TiTe3O8 films sintered at 700 °C are dense and homogeneous.

Anodic Electrophoretic Deposition of TiO2 Nanoparticles Synthesized Using Sol Gel Method

2013 ◽  
Vol 832 ◽  
pp. 633-638
Author(s):  
Khatijah Aisha Yaacob ◽  
David Jason Riley
Keyword(s):  
Electrophoretic Deposition ◽  
Deposition Time ◽  
Anatase Phase ◽  
Sol Gel ◽  
Particle Diameter ◽  
Deposition Process ◽  
Titanium Isopropoxide ◽  
Solid Loading ◽  
Charged Nanoparticles ◽  
Positively Charged

Many researches on electrophoretic deposition of TiO2 nanoparticles (NPs) use commercial TiO2 nanoparticles from Degussa. TiO2 from Degussa is not use in this research because in order to make the TiO2 nanoparticle electronically charged and move under an applied constant voltage, a small amount of iodine and acetylacetone needs to be added to the suspension. It is suggested that the H+ ions generated by the reaction is absorbed on the suspended particles making them positively charged. For anodic EPD, negatively charged nanoparticles are required. In this research TiO2 nanoparticles were prepared by adding 1 ml of titanium isopropoxide dilute with 1 ml ethanol to 10 ml DI water and stirrer under 0°C for 4 hr. As prepared TiO2 nanoparticle were centrifuged at 5500 rpm for 10 min to isolate the particles from the solution. Then the TiO2 nanoparticles were resuspended in ethanol or water. TiO2 nanoparticle with particle diameter of 4.66 nm and anatase phase were produced. Important electrophoretic deposition process parameters, such as apparent pH of the TiO2 NPs, applied voltage, deposition time and solid loading, were studied during electrophoretic deposition of TiO2 nanoparticles.

Electrophoretic Deposition of Nanocrystalline SiC Ceramics

2006 ◽  
Vol 314 ◽  
pp. 33-38 ◽  
Author(s):  
S. Wildhack ◽  
Fritz Aldinger
Keyword(s):  
Particle Size ◽  
Zeta Potential ◽  
Electrophoretic Deposition ◽  
Deposition Time ◽  
Auxiliary Information ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Present Contribution ◽  
Surface Conditions ◽  
Sic Ceramics

In the present contribution, the electrophoretic deposition (EPD) of nanocrystalline SiC powders will be discussed. In order to avoid the electrolysis of water during deposition as well as oxygen uptake of the nanocrystalline SiC by hydrolysis reactions, nonaqueous solvents were tested including ethanol and diethyl formamide. The solvents were compared regarding their effect on particle size distributions and sedimentation tests. Auxiliary information on the surface conditions as a function of the acidity of the suspension was drawn from aqueous zeta-potential measurements. The influence of dispersants, binders and the type of powder on the suspension properties was studied, and EPD was performed. For promising solvent-dispersant systems, the film thickness, current and deposition time at a given voltage were monitored during EPD.

Study on Electrophoretic Deposition Characteristics of Ultra-Fine Diamond Powder

2012 ◽  
Vol 472-475 ◽  
pp. 2702-2706 ◽  
Author(s):  
Xian Yan Mao ◽  
Jing Lu ◽  
Hua Guo
Keyword(s):  
Electrophoretic Deposition ◽  
Applied Voltage ◽  
Deposition Time ◽  
Diamond Powder ◽  
Simple Method ◽  
Wear Resistant ◽  
Suspension Concentration ◽  
Fine Diamond ◽  
Tools Wear ◽  
The Impact

Diamond is a promising material especially applied in advanced machining tools, wear-resistant coatings, and the EPD technique should provide a simple method to develop hard coatings for precision machining tools or wear-resistant parts. Therefore, it is useful to research electrophoretic deposition characteristics of diamond powder itself, including the impact of adding ions on direction of EPD especially. In this paper, the effects of suspension concentration and applied voltage, deposition time, and added Ca2+ or Al3+ ions on electrophoretic characteristics of ultra-fine diamond powder were discussed, and electrophoretic deposition (EPD) parameters were optimized by a trial-and-error approach. The results show that smooth, uniform and dense coatings of diamond were obtained under suspension concentration of 1%-1.5% and applied voltage of 30-70 V. The thickness of diamond coating can be controlled by adjusting deposition time under constant voltage and suspension concentration. If deposition direction changed, the appropriate concentration of added Ca2 + and Al3 +, respectively, is in the range of 0.005% to 0.01% and 0.05% to 0.10%.

scholarly journals The influence of the deposition parameters on the porosity of thin alumina films on steel

2004 ◽  
Vol 69 (3) ◽  
pp. 239-249 ◽  
Author(s):  
Marija Lazic ◽  
Kornelija Simovic ◽  
Vesna Miskovic-Stankovic ◽  
Predrag Jovanic ◽  
Dusan Kicevic
Keyword(s):  
Image Analysis ◽  
Applied Voltage ◽  
Deposition Time ◽  
Aqueous Suspension ◽  
Deposition Process ◽  
Solid Content ◽  
Alumina Powder ◽  
Alumina Films ◽  
Deposition Parameters ◽  
Film Porosity

The influence of the deposition parameters on the porosity of thin alumina films electrophoretically deposited on steel from aqueous suspensions was investigated. The effects of the applied voltage, deposition time, suspension temperature and the solid content of the aqueous suspension on the porosity of the obtained alumina films have been determined using optical microscopy coupled with image analysis. It was shown that the lowest film porosity was obtained from a suspension containing 20 wt.% alumina powder at the lowest applied voltage (30 V), for a longer deposition time (10 min) using a suspension temperature of 30 ?C. This behavior can be explained by the smaller amount of hydrogen evolved on the cathode during the electrophoretic deposition process.

scholarly journals Electrophoretic Deposition of WS2 Flakes on Nanoholes Arrays—Role of Used Suspension Medium

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3286 ◽  
Author(s):  
Dario Mosconi ◽  
Giorgia Giovannini ◽  
Nicolò Maccaferri ◽  
Michele Serri ◽  
Stefano Agnoli ◽  
...  
Keyword(s):  
Electrophoretic Deposition ◽  
Deposition Process ◽  
Plasmonic Nanostructures ◽  
Selective Deposition ◽  
Ordered Arrays ◽  
Plasmonic Structures ◽  
The Stability ◽  
Site Selective ◽  
Integrated Structures

Here we optimized the electrophoretic deposition process for the fabrication of WS2 plasmonic nanohole integrated structures. We showed how the conditions used for site-selective deposition influenced the properties of the deposited flakes. In particular, we investigated the effect of different suspension buffers used during the deposition both in the efficiency of the process and in the stability of WS2 flakes, which were deposited on an ordered arrays of plasmonic nanostructures. We observed that a proper buffer can significantly facilitate the deposition process, keeping the material stable with respect to oxidation and contamination. Moreover, the integrated plasmonic structures that can be prepared with this process can be applied to enhanced spectroscopies and for the preparation of 2D nanopores.

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