ADVANCEMENT IN PREPARATION OF HYDROXYAPATITE/BIOGLASS GRADED COATINGS BY ELECTROPHORETIC DEPOSITION

2005 ◽  
Vol 12 (05n06) ◽  
pp. 773-779 ◽  
Author(s):  
LIANG YAO ◽  
CHUANZHONG CHEN ◽  
DIANGANG WANG ◽  
QUANHE BAO ◽  
JIE MA
Keyword(s):  
Influencing Factors ◽  
Electrophoretic Deposition ◽  
Deposition Time ◽  
Complex Shape ◽  
Good Method ◽  
Processing Parameters ◽  
Porous Surface ◽  
Graded Coatings ◽  
Dispersion Media ◽  
Bioceramic Coatings

Electrophoretic deposition is a good method in the preparation of hydroxyapatite/bioglass graded coatings. Its processing parameters are easy to be operated. As it is nonbeeline process, it can be used in the deposition of complex shape and porous surface. This paper reviewed the advancement of the graded coatings in recent years, concluded the principles, characters, steps of electrophoretic deposition of bioceramic coatings and analyzed influencing factors in detail, such as granularity of suspension, aging of suspension, dispersion media, PH of suspension, electricity, voltage, deposition time, pretreatment of substrate and sintering. The foreground of hydroxyapatite/bioglass graded coatings is expected.

APPLICATIONS OF ELECTROPHORETIC DEPOSITION IN THE COATING AND POROUS MATERIALS FABRICATIONS

2006 ◽  
Vol 13 (01) ◽  
pp. 103-109 ◽  
Author(s):  
LIANG YAO ◽  
CHUANZHONG CHEN ◽  
DIANGANG WANG ◽  
QUANHE BAO ◽  
JIE MA ◽  
...  
Keyword(s):  
Porous Structure ◽  
Porous Materials ◽  
Electrophoretic Deposition ◽  
Solid Surface ◽  
Complex Shape ◽  
Good Method ◽  
Processing Parameters ◽  
Surface Coatings ◽  
Coating Materials ◽  
Gradient Materials

Electrophoretic deposition (EPD) is a good method in the fabrication of the coating materials. Its processing parameters are easy to be operate. It is a nonbeeline process and can be used in the deposition on complex shape and porous surface. It has been widely used in many ways. This paper reviews the principles and fabrication steps of EPD and points out the influencing factors. The developments of EPD in the fabrication of materials, such as solid surface coatings, porous structure materials and gradient materials, are introduced in detail. The future of the application of EPD is also discussed.

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.

Ultra-Low-Power Electrophoretic Deposition of Silica Powder with Nonflammable Organic Solvent

2015 ◽  
Vol 654 ◽  
pp. 88-93
Author(s):  
Hideyuki Negishi
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Electrophoretic Deposition ◽  
Particle Concentration ◽  
Deposition Time ◽  
Ultra Low Power ◽  
Silica Powder ◽  
Inorganic Particles ◽  
Uniform Coating ◽  
Electrical Insulation Properties

Although conventional organic solvents are used in electrophoretic deposition (EPD) owing to several advantages, they are hazardous because of their inflammability or ignition properties. In contrast, hydrofluoro ether (HFE) is nonflammable, polar and possesses excellent electrical insulation properties. In this study, methoxy-nonafluorobutane (MNFB), which is one of HFE was used as the solvent for the EPD of silica powder. Because the density of MNFB is larger than water, sedimentation of inorganic particles is slow. The deposition behavior in MNFB was similar to the EPD in conventional solvents, and was controlled by tuning the applied voltage, deposition time, and particle concentration. A uniform coating was obtained. Notably, the power consumed in this process was significantly lower than that in the EPD using conventional solvents. The current density was of the order of 10 nA/cm2; therefore, the electric power consumption for EPD using MNFB was less than 0.1% of those using conventional solvents. Therefore, MNFB can be used as an effective solvent for EPD because it is nonflammable, allows the application of high voltage, and enables the deposition of particles with low power consumption.

Electrophoretic Deposition of Titania Thin Films: Influence of Deposition Time on Microstructural and Optical Properties of the Coatings

2013 ◽  
Vol 829 ◽  
pp. 917-921
Author(s):  
Saber Ghannadi ◽  
Hossein Abdizadeh ◽  
Mohammad Reza Golobostanfard
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Electrophoretic Deposition ◽  
Deposition Time ◽  
Colloidal Suspension ◽  
Vis Spectroscopy ◽  
Titania Films ◽  
Titania Sol ◽  
Deposited Film ◽  
Deposited Films

Titania thin films were prepared by electrophoretic deposition at various deposition times (1, 5 and 10 min) in constant applied potential (5 V). For this purpose, modified titania sol was prepared as a colloidal suspension. The influence of deposition time on the thickness and optical properties of titania films was investigated. Scanning electron microscope images illustrate compact and homogeneous titania films deposited on FTO substrates. The results show that the film thickness increases with increasing the deposition time. It could be inferred from UV-Vis spectroscopy that increasing the thickness of deposited film causes higher absorbance at UV region. Also, increasing the deposition time from 1 to 5 min leads to increase in optical band gap of the deposited films.

Image Threshold Segmentation Algorithm Based on Histogram Statistical Property

2014 ◽  
Vol 644-650 ◽  
pp. 4027-4030
Author(s):  
Hong Li ◽  
Zhong An Lai ◽  
Jun Wei Lei
Keyword(s):  
Normal Distribution ◽  
Complex Shape ◽  
Good Method ◽  
Segmentation Algorithm ◽  
Gray Level ◽  
Background Region ◽  
Threshold Segmentation ◽  
Target Region ◽  
Statistical Property ◽  
Otsu’S Method

The traditional Otsu threshold algorithm is not a good method for processing the real images because of complex shape and unbalanced distribution. To solve this problem, the paper uses the thinking of Otsu’s method for reference, introduces a threshold segmentation algorithm based on histogram statistical property. In addition, the paper draws a comparison between the new algorithm and Otsu’s algorithm. Experimental results show that the new algorithm can get better segmentation effect than that of Otsu’s method when the gray-level distribution of the background follows normal distribution approximatively, and the target region is less than the background region.

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.

Electrophoretic deposition of chitosan/gelatin coatings with controlled porous surface topography to enhance initial osteoblast adhesive responses

2016 ◽  
Vol 4 (47) ◽  
pp. 7584-7595 ◽  
Author(s):  
Zhen Zhang ◽  
Xian Cheng ◽  
Yao Yao ◽  
Jiaxin Luo ◽  
Qingming Tang ◽  
...  
Keyword(s):  
Surface Topography ◽  
Electrophoretic Deposition ◽  
Porous Surface ◽  
Bubble Generation

This study developed a method to fabricated electrophoretic deposited coatings with controllable porous surface topography via controlling bubble generation to enhance initial osteoblast adhesive responses.

Electrophoretic Deposition of Magnesium Oxide Nanoparticles on Magnesium: Processing Parameters, Microstructures, Degradation, and Cytocompatibility

2019 ◽  
Vol 2 (12) ◽  
pp. 5634-5652
Author(s):  
Mayra Celene Cortez Alcaraz ◽  
Aaron F. Cipriano ◽  
Jiajia Lin ◽  
Pedro Soria ◽  
Qiaomu Tian ◽  
...  
Keyword(s):  
Magnesium Oxide ◽  
Electrophoretic Deposition ◽  
Processing Parameters ◽  
Oxide Nanoparticles ◽  
Magnesium Oxide Nanoparticles

Preparation and Properties of Hot Pressed 2D C/SiC Composites

2008 ◽  
Vol 368-372 ◽  
pp. 1047-1049
Author(s):  
Hai Feng Hu ◽  
Feng Zhang ◽  
Qi Kun Wang ◽  
Yu Di Zhang ◽  
Zhao Hui Chen
Keyword(s):  
Carbon Fibers ◽  
Complex Shape ◽  
Sintering Temperature ◽  
Processing Parameters ◽  
Holding Time ◽  
Maximum Strength ◽  
Carbon Powder ◽  
Optimum Processing ◽  
Sic Composites ◽  
Transfer Pressure

In this paper a pseudo-HP process, which uses solid powder to transfer pressure to prepare complex shape articles, was adopted to prepare 2D C/SiC composites. Nano-SiC powder was used to lower the sintering temperature, thus decreasing the damage to carbon fibers. The optimum processing parameters are as follows: sintering temperature 1850°C, holding time 60min, sintering pressure 10MPa. The maximum strength is over 300MPa, and toughness is around 8MPa·m1/2. BN powder is more lubricous than carbon powder, and thus is more convenient for demoulding and pressure transferring. Precursor Infiltration and Pyrolysis (PIP) was used to further densify the composites after HP process, and strength and toughness of the samples were slightly enhanced.

Sign in / Sign up

Export Citation Format

Share Document