Open Access10.22059/JUFGNSM.2019.01.06
effect of pulsed current densities on co-electrodeposition of graphene oxide/ calcium-phosphate coatings and their biocompatibility
Leila Fathyunes,Jafar Khalil-Allafi,Fatemeh Marashi-Najafi +2 more
- 01 Jun 2019
- Vol. 52, Iss: 1, pp 57-68
TL;DR: In this article, the co-electrodeposition rate in the presence of GO, especially at low current densities of 2 and 5 mA/cm2, significantly decreased, due to the large size of GO sheets as compared to the size of calcium and phosphate ions.
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Abstract: In this study, calcium-phosphate (Ca-P) and graphene oxide (GO)/ calcium-phosphate (Ca-P) coatings were electrodeposited with different pulsed current densities on TiO2 nanotubes. Results showed that the co-electrodeposition rate in the presence of GO, especially at low current densities of 2 and 5 mA/cm2, significantly decreased. This might be due to the large size of GO sheets as compared to the size of calcium and phosphate ions. The SEM micrographs revealed that the surface of the anodized titanium could not be completely covered with the GO/Ca-P coatings applied at such low current densities. However, producing a considerable amount of H2 gases at higher current densities of 10 and 15 mA/cm2 caused the formation of a coating with poor quality. Regarding this, increasing the off part of the pulsed current by changing duty cycle from 0.3 to 0.1 led to the co-electrodeposition of GO/Ca-P coating with an acceptable quality. The FTIR and micro-Raman analyses also demonstrated that the current density of 15 mA/cm2 was more favorable to apply the coating predominantly consisting of hydroxyapatite (HA) phase. At last, studying the ability of apatite mineralization in simulated body fluid (SBF) displayed that both Ca-P and GO/Ca-P coatings electrodeposited at the current density of 15 mA/cm2 and duty cycle of 0.1 are acceptable for biomedical applications.
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Citations
Effect of Processing Conditions on the Crystallinity and Structure of Carbonated Calcium Hydroxyapatite (CHAp)
Edita Garskaite,Kārlis-Agris Gross,Sung Wei Yang,Thomas C.-K. Yang,Jen Chang Yang,Aivaras Kareiva +5 more
- 01 Jan 2014
TL;DR: In this paper, carbonated hydroxyapatite was prepared by precipitating an amorphous phase followed by crystallization at 650 °C at slow (5 °C min−1) and fast heating rates (60 °Cmin−1).
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A review of the electrodeposition of metal matrix composite coatings by inclusion of particles in a metal layer: an established and diversifying technology
Frank C. Walsh,C. Ponce de León +1 more
TL;DR: A brief overview of the history of composite plated coatings can be found in this article, where the principles and role of electroplating compared to other techniques for realising such coatings are considered.
Graphene oxide/hydroxyapatite composite coatings fabricated by electrophoretic nanotechnology for biological applications
TL;DR: Graphene oxide (GO) was firstly employed as nanoscale reinforcement fillers in hydroxyapatite (HA) coatings by a cathodic electrophoretic deposition process, and GO/HA coatings were fabricated on pure Ti substrate as mentioned in this paper.
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Electrodeposition of hydroxyapatite onto nanotubular TiO2 for implant applications
TL;DR: In this paper, an innovative method of preparation of a nanotubular titania surface and subsequent electrodeposition of hydroxyapatite nanocrystalline coating was reported.
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