Hydroxyapatite coating by electrophoretic deposition at dynamic voltage

Meng, Xianwei; Kwon, Tae‐Yub; Kim, Kyo-Han

doi:10.4012/dmj.27.666

Cited by 54 publications

(47 citation statements)

References 34 publications

(33 reference statements)

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“…To prevent cracking it is necessary to control the drying conditions carefully or use additives which will prevent crack formation without affecting the material properties. 18), 19) The purpose of this study was to obtain porous, crack-free HA materials by EPD. Multi-walled carbon nanotubes (MWCNTs) were used to avoid cracking of the deposits.…”

Section: Introductionmentioning

confidence: 99%

Production of tubular porous hydroxyapatite using electrophoretic deposition

Üstündağ

Kaya

Kamitakahara

et al. 2012

J. Ceram. Soc. Japan

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Hydroxyapatite (HA) ceramics have been recognized as bone substitute materials in orthopedic and dental applications because of their chemical and biological similarity to human bone. Porous HA ceramics can be used as scaffold materials, if their microstructure is controlled in terms of pore size and porosity. The objective of the present work was to produce tubular-shaped HA scaffolds for biomedical applications using the cost-effective technique of electrophoretic deposition (EPD) which enables various 3D shapes to be produced. Nano HA powders were produced and mixed with multi-walled carbon nanotubes (MWCNTs) by a hydrothermal process. Calcium acetate (Ca(CH 3 COO) 2 ), and phosphoric acid (H 3 PO 4 ) were used as starting materials for the synthesis of the nano HA powders. Porous HA coatings were deposited on carbon rods by EPD at 60 V using a butanol suspension mixture containing nano HA powders and MWCNTs. Nano composite coatings produced were sintered at 1200°C for 60 min to burn-out the carbon rod and MWCNTs. It was shown that MWCNTs provided crack-free coating layers after coating and a porous structure after sintering. The porous HA coatings obtained were coated using different EPD parameters in terms of applied voltage and deposition time. EPD provides a coating thickness of ³310¯m for a deposition time of 480 s. This method enabled the formation of coatings with variable thickness, depending on the duration of coating and applied DC voltage. Hydrothermal mixing of HA/MWCNTs and the mechanism of deposition are also discussed. The methods can produce 3D-shaped HA scaffolds for clinical applications. The results demonstrate that the HA tubes obtained are candidate materials as scaffolds for bone repairing and generation.

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Section: Introductionmentioning

confidence: 99%

Production of tubular porous hydroxyapatite using electrophoretic deposition

Üstündağ

Kaya

Kamitakahara

et al. 2012

J. Ceram. Soc. Japan

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“…Advantages also include ability to coat with uniform thickness, wide range of thicknesses, ability to coat complex shapes, and ease of chemical composition control [36][37][38][39][40][41][42]. These coatings have strong adhesion to the substrate and are mainly composed of pure phases without any metastable or mixed phases.…”

Section: Electrophoresismentioning

confidence: 99%

“…10). It was observed that the dense HA inner layer exhibited high bond strength, whereas the outer layer showed lower bond strength [42]. Further sintering was done for 2 hours at 800°C.…”

Section: Dynamic Voltage Electrophoresismentioning

confidence: 99%

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Electrochemical surface modification of titanium in dentistry

2009

Self Cite

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Titanium and its alloys have good biocompatibility with body cells and tissues and are widely used for implant applications. However, clinical procedures place more stringent and tough requirements on the titanium surface necessitating artificial surface treatments. Among the many methods of titanium surface modification, electrochemical techniques are simple and cheap. Anodic oxidation is the anodic electrochemical technique while electrophoretic and cathodic depositions are the cathodic electrochemical techniques. By anodic oxidation it is possible to obtain desired roughness, porosity and chemical composition of the oxide. Anodic oxidation at high voltages can improve the crystallinity of the oxide. The chief advantage of this technique is doping of the coating of the bath constituents and incorporation of these elements improves the properties of the oxide. Electrophoretic deposition uses hydroxyapatite (HA) powders dispersed in a suitable solvent at a particular pH. Under these operating conditions these particles acquire positive charge and coatings are obtained on the cathodic titanium by applying an external electric field. These coatings require a post-sintering treatment to improve the coating properties. Cathodic deposition is another type of electrochemical method where HA is formed in situ from an electrolyte containing calcium and phosphate ions. It is also possible to alter structure and/or chemistry of the obtained deposit. Nano-grained HA has higher surface energy and greater biological activity and therefore emphasis is being laid to produce these coatings by cathodic deposition.

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“…The most popular deposition methods involve: plasma spraying [3], electrodeposition [4], CVD and PVD, sol-gel method and ion beam sputtering [5][6][7]. As those ceramic coatings are brittle, very thin coatings or nanocoatings are developed by the pulsed laser deposition (PLD) or electrophoretic techniques (EPD) [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite deposition on the laser modified Ti13Nb13Zr alloy

Jażdżewska

Majkowska-Marzec

2017

Advances in Materials Science

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The Ti13Nb13Zr alloy was subjected to laser modification with the Nd:YAG laser provided that such treatment would increase the surface roughness followed improved adhesion of hydroxyapatite (HAp) coatings The hydroxyapatite was deposited by electrophoretic method in suspension of 0.5 g HA powder and 100 ml ethyl alcohol. The deposition was carried out for 10 min at 10 V voltage followed by drying at room temperature for 24 h and heating at 800°C for 1 h in vacuum. The thickness of the HAp coatings was found as of about 4.06 µm to 9.05 µm. The examinations of surfaces were carried out at each stage of the experiment with the ultra-high resolution scanning electron microscope. The measurements of surface roughness after laser treatment and after HAp deposition were performed with the Hommel Etamic Waveline profilograph.

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Hydroxyapatite coating by electrophoretic deposition at dynamic voltage

Cited by 54 publications

References 34 publications

Production of tubular porous hydroxyapatite using electrophoretic deposition

Production of tubular porous hydroxyapatite using electrophoretic deposition

Electrochemical surface modification of titanium in dentistry

Hydroxyapatite deposition on the laser modified Ti13Nb13Zr alloy

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