Electrophoretic coating of Hydroxyapatite on pyrolytic carbon using glycol as dispersion medium

Gao, Lin; Lin, Jia-Rui

doi:10.1007/s11595-007-3293-5

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…Historically, pyrolytic carbon was widely used for implant coating/construction, as such coatings tended to resist blood clotting on their surface and to make a frictionless surface, which is very useful in cases where the implant needs to have some sort of relative motion with other implants/surfaces. This material was also used for coating orthopaedic implants, like those that are used for finger joint implants, but was limited in their use in orthopaedic implants due to poor bone bonding properties [ 73 , 74 ]. Hetherington et al [ 75 ] tried to investigate the bone response to HAp-coated pyrolytic carbon, as they plasma-sprayed HAp on pyrolytic carbon implants.…”

Section: Carbon and Its Structuresmentioning

confidence: 99%

“…This study showed that HAp favours a durable bond with the adjacent tissue. Similarly, Lin and Jiarui [ 73 ] have reported HAp coating on pyrolytic carbon via electrophoretic deposition (EPD) in glycol and ethanol separately (as the dispersion medium), as they were studying the effect of dispersing media on coating quality. However, this coating was characterised for its chemical and biological properties only, and not for its mechanical properties.…”

Section: Carbon and Its Structuresmentioning

confidence: 99%

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A Review on the Use of Hydroxyapatite-Carbonaceous Structure Composites in Bone Replacement Materials for Strengthening Purposes

2018

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Biomedical materials constitute a vast scientific research field, which is devoted to producing medical devices which aid in enhancing human life. In this field, there is an enormous demand for long-lasting implants and bone substitutes that avoid rejection issues whilst providing favourable bioactivity, osteoconductivity and robust mechanical properties. Hydroxyapatite (HAp)-based biomaterials possess a close chemical resemblance to the mineral phase of bone, which give rise to their excellent biocompatibility, so allowing for them to serve the purpose of a bone-substituting and osteoconductive scaffold. The biodegradability of HAp is low (Ksp ≈ 6.62 × 10−126) as compared to other calcium phosphates materials, however they are known for their ability to develop bone-like apatite coatings on their surface for enhanced bone bonding. Despite its favourable bone regeneration properties, restrictions on the use of pure HAp ceramics in high load-bearing applications exist due to its inherently low mechanical properties (including low strength and fracture toughness, and poor wear resistance). Recent innovations in the field of bio-composites and nanoscience have reignited the investigation of utilising different carbonaceous materials for enhancing the mechanical properties of composites, including HAp-based bio-composites. Researchers have preferred carbonaceous materials with hydroxyapatite due to their inherent biocompatibility and good structural properties. It has been demonstrated that different structures of carbonaceous material can be used to improve the fracture toughness of HAp, as they can easily serve the purpose of being a second phase reinforcement, with the resulting composite still being a biocompatible material. Nanostructured carbonaceous structures, especially those in the form of fibres and sheets, were found to be very effective in increasing the fracture toughness values of HAp. Minor addition of CNTs (3 wt.%) has resulted in a more than 200% increase in fracture toughness of hydroxyapatite-nanorods/CNTs made using spark plasma sintering. This paper presents a current review of the research field of using different carbonaceous materials composited with hydroxyapatite with the intent being to produce high performance biomedically targeted materials.

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Section: Carbon and Its Structuresmentioning

confidence: 99%

Section: Carbon and Its Structuresmentioning

confidence: 99%

A Review on the Use of Hydroxyapatite-Carbonaceous Structure Composites in Bone Replacement Materials for Strengthening Purposes

2018

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“…Therefore, coating HA onto matrix materials is a promising technique [3][4][5][6][7]. In our previous studies it was found that the dispersion medium affect the strength of green HA coatings obtained by electrophoretic deposition (EPD) [8,9]. This paper will focus on the influence of ripening time and the kind of dispersion medium on the strength of green HA coatings.…”

Section: Introductionmentioning

confidence: 99%

Research on the Strength of Green Hydroxyapatite Coating Obtained by Electrophoretic Deposition

Gao

2012

AMR

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Coating hydroxyapatite (HA) onto matrix materials is a promising technique. The firm level of green coating is very important to the further sintering treatment. In this paper the HA powders with different ripening time were synthesized by precipitation process using (NH4)3PO4and Ca(NO3)2at room temperature. The influence of ripening time and the kind of dispersion medium on the strength of green HA coatings was studied by means of coating HA onto pyrolytic carbon via electrophoretic deposition (EPD). The results show that the ripening time of HA particles and dispersion medium affect the strength of green HA coatings obtained by EPD obviously. The recommended ripening time of HA particles is about 22 hours if anhydrous ethanol or n-butanol is used as dispersion medium. The strength of green HA coatings obtained by EPD can be enhanced miraculously if glycol is used as dispersion medium.

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“…In the first stage, the reaction product occurring in the inner surface of the steel pipe is a gas phase mixture, followed by a phase separation, lining, and solidification of Al 2 O 3 and Fe products under the effect of centrifugal acceleration. 7,8,[20][21][22][23][24][25][26][27][28][29][30] According to literature, the density of the ceramic layer is about 2.9 g/cm 3 . 12 Generally, the ceramic layer is joined to the base steel by an intermetallic Fe-rich layer.…”

Section: Introductionmentioning

confidence: 99%

The Effects of an Unexpected Ceramic Coating Phase at the Head of a Pipe on Joining and Postprocessing of a Ceramic-Lined Composite Pipe

Mahmoodian

Rahbari

Hamdi

et al. 2012

JOM

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Produced ceramic-lined steel pipe using the self-propagating high-temperature synthesis (SHS) method has found uses in many applications. A SHScentrifugal machine was designed to produce a ceramic-lined steel pipe from ferric oxide and aluminum powder (thermite mixture) under high centrifugal acceleration. The obtained products are expected to be Al 2 O 3 ceramic in the innermost layer and a Fe layer in a region between the outer steel pipes. In the present work, specific regions of a pipe was particularly observed to investigate the stuck (dead) spaces at the pipe head because of its importance in further processes (joining, welding, etc.) which may affect the quality of the next operations. In this article, the product's composition, phase separation, microhardness, and surface finish were studied on three zones of the pipe.

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Electrophoretic coating of Hydroxyapatite on pyrolytic carbon using glycol as dispersion medium

Cited by 5 publications

References 22 publications

A Review on the Use of Hydroxyapatite-Carbonaceous Structure Composites in Bone Replacement Materials for Strengthening Purposes

A Review on the Use of Hydroxyapatite-Carbonaceous Structure Composites in Bone Replacement Materials for Strengthening Purposes

Research on the Strength of Green Hydroxyapatite Coating Obtained by Electrophoretic Deposition

The Effects of an Unexpected Ceramic Coating Phase at the Head of a Pipe on Joining and Postprocessing of a Ceramic-Lined Composite Pipe

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