The Experts below are selected from a list of 147 Experts worldwide ranked by ideXlab platform
Fuping Wang - One of the best experts on this subject based on the ideXlab platform.
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Biomimetic Deposition of apatite coatings on biomedical NiTi alloy coated with amorphous titanium oxide by microarc oxidation
Materials Science and Technology, 2013Co-Authors: H R Wang, Y Song, Fuping WangAbstract:AbstractThe biomedical NiTi alloy was treated by microarc oxidation (MAO) in H3PO4 electrolyte using DC power supply. The amorphous titanium oxide coating with porous and rough structure was formed on NiTi alloy. The MAO treated NiTi was soaked in a simulated body fluid (1·0SBF) to investigate the Biomimetic Deposition of apatite on the surface of titanium oxide coated NiTi alloy. It was found that titanium oxide coated NiTi alloy shows an excellent apatite forming ability after soaking in a simulated body fluid (1·0SBF) for 28 days, while no apatite forming ability was observed on bared NiTi alloy, even though soaking time is up to 28 days. The Fourier transformed infrared and X-ray photoelectron spectroscopy results showed that apatite deposited on MAO treated NiTi is a kind of incorporated and Ca deficient apatite.
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Biomimetic Deposition of apatite coatings on micro arc oxidation treated biomedical niti alloy
Surface & Coatings Technology, 2010Co-Authors: J.l. Xu, Fuping Wang, Liancheng Zhao, Tadao ShimizuAbstract:Abstract The biomedical NiTi alloy was treated by micro-arc oxidation in an electrolytes containing sodium aluminate and sodium hypophosphite at 400 V constant voltages for 30 min. The MAO-treated NiTi has a porous microstructure on its surface and coatings consisting only of the γ-Al 2 O 3 phase. The ceramic coating prepared by micro-arc oxidation is composed of Al, Ti, Ni, O, and P with the atomic concentration of 26.98%, 3.67%, 3.33%, 65.30% and 0.72%, respectively. The MAO-treated NiTi was soaked in a simulated body fluid (1.0SBF) to investigate the Biomimetic Deposition of apatite on the surface of Al 2 O 3 coated NiTi alloy. It was found that Al 2 O 3 coated NiTi alloy shows an excellent apatite-forming ability after soaking in a simulated body fluid (1.0SBF) for 14 days, while no apatite-forming ability was observed on bared NiTi alloy even though soaking time is up to 28 days.
Tadao Shimizu - One of the best experts on this subject based on the ideXlab platform.
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Biomimetic Deposition of apatite coatings on micro arc oxidation treated biomedical niti alloy
Surface & Coatings Technology, 2010Co-Authors: J.l. Xu, Fuping Wang, Liancheng Zhao, Tadao ShimizuAbstract:Abstract The biomedical NiTi alloy was treated by micro-arc oxidation in an electrolytes containing sodium aluminate and sodium hypophosphite at 400 V constant voltages for 30 min. The MAO-treated NiTi has a porous microstructure on its surface and coatings consisting only of the γ-Al 2 O 3 phase. The ceramic coating prepared by micro-arc oxidation is composed of Al, Ti, Ni, O, and P with the atomic concentration of 26.98%, 3.67%, 3.33%, 65.30% and 0.72%, respectively. The MAO-treated NiTi was soaked in a simulated body fluid (1.0SBF) to investigate the Biomimetic Deposition of apatite on the surface of Al 2 O 3 coated NiTi alloy. It was found that Al 2 O 3 coated NiTi alloy shows an excellent apatite-forming ability after soaking in a simulated body fluid (1.0SBF) for 14 days, while no apatite-forming ability was observed on bared NiTi alloy even though soaking time is up to 28 days.
Rongfang Liu - One of the best experts on this subject based on the ideXlab platform.
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the Biomimetic Deposition of carbonate apatite induced by titanium base calcium enriched silica films
Materials Science and Technology, 2011Co-Authors: X F Xiao, Rongfang Liu, Y J GaoAbstract:In order to obtain a fast Biomimetic coating on titanium substrates, calcium enriched silica films were prepared on pure titanium substrates by sol–gel method under the following conditions: pH = 3 and the molar ratio of tetraethyl orthosilicate (TEOS)/H2O/EtOH/Ca2+ = 1∶4∶11∶0·08. The titanium base calcium enriched silica film is soaked in a slightly supersaturated Ca/P solution, with the concentration of calcium ion and phosphate group being 1·5 times of that of simulated body fluid, for seven days, a uniform apatite layer is precipitated onto the surfaces of calcium enriched silica films, which is quite rapidly. The investigation adopted SEM, EDX, Fourier transform infrared spectroscope and XRD to indicate that the coating was carbonate hydroxyapatite. The results show that it is a feasible way to obtain carbonate hydroxyapatite through functionalising the pure titanium substrates by preparing calcium enriched silica films on it from a sol–gel method.
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influence of titania nanotube arrays on Biomimetic Deposition apatite on titanium by alkali treatment
Materials Chemistry and Physics, 2007Co-Authors: Xiufeng Xiao, Tian Tian, Rongfang Liu, Houde SheAbstract:Abstract Titania nanotube arrays were fabricated by anodic oxidation of titanium foils in HF solution, which were then treated in NaOH solution or Ca(OH) 2 solution to make them bioactive. The ability to form apatite on the as-treated samples was examined by immersion tests in simulated body fluid combined with Enviromental Scanning Electron Microscopy (ESEM), Energy Dispersive X-ray Analyzer (EDAX) and X-ray diffractometer (XRD) investigations. The results show that the presence of titania nanotube arrays on titanium surface could shorten the activation time of NaOH-treated from 24 h to 30 min, and induces the growth of nano-grain calcium titanate on the top edge of the nanotube wall in Ca(OH) 2 solution. During the subsequent in vitro immersion in a simulated body fluid, the nano-grain calcium titanate, in turn, induced the formation of apatite phase. It is expected that titanium with such titania nanotube can be used in clinical orthopaedics.
Lijia Liu - One of the best experts on this subject based on the ideXlab platform.
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the effect of crystal structure of tio2 nanotubes on the formation of calcium phosphate coatings during Biomimetic Deposition
Applied Surface Science, 2017Co-Authors: Yi Liu, Sun Kim, John A Mcleod, Xiaoxuan Guo, Tsunkong Sham, Lijia LiuAbstract:Abstract The crystallization process of bioactive calcium phosphate (CaP) species via Biomimetic Deposition onto anodic TiO 2 nanotubes is investigated. The porous surface of nanostructured TiO 2 provides an ideal substrate for CaP crystallization. The compositions of CaP coatings are studied using X-ray absorption near-edge structures (XANES) at the Ca K-edge. Using detection modes with different probing depths, both the surface of the CaP coating and the CaP-TiO 2 interface are simultaneously analyzed. Calcium phosphate (CaP) species, such as hydroxyapatite (HAp), octacalcium phosphate (Ca 8 (HPO 4 ) 2 (PO 4 ) 4 ·5H 2 O, OCP), brushite (CaHPO 4 ·2H 2 O, DCPD), and amorphous calcium phosphate (ACP), are found in the CaP coatings. TiO 2 nanotubes of amorphous and anatase phases are comparatively studied to determine their effect on the efficiency of CaP formation and the phase transformation among CaP species in prolonged Deposition time. It is found the composition of CaP coating has a strong dependency on the crystal structure of TiO 2 substrate and the kinetics (Deposition time).
Tsunkong Sham - One of the best experts on this subject based on the ideXlab platform.
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the effect of crystal structure of tio2 nanotubes on the formation of calcium phosphate coatings during Biomimetic Deposition
Applied Surface Science, 2017Co-Authors: Yi Liu, Sun Kim, John A Mcleod, Xiaoxuan Guo, Tsunkong Sham, Lijia LiuAbstract:Abstract The crystallization process of bioactive calcium phosphate (CaP) species via Biomimetic Deposition onto anodic TiO 2 nanotubes is investigated. The porous surface of nanostructured TiO 2 provides an ideal substrate for CaP crystallization. The compositions of CaP coatings are studied using X-ray absorption near-edge structures (XANES) at the Ca K-edge. Using detection modes with different probing depths, both the surface of the CaP coating and the CaP-TiO 2 interface are simultaneously analyzed. Calcium phosphate (CaP) species, such as hydroxyapatite (HAp), octacalcium phosphate (Ca 8 (HPO 4 ) 2 (PO 4 ) 4 ·5H 2 O, OCP), brushite (CaHPO 4 ·2H 2 O, DCPD), and amorphous calcium phosphate (ACP), are found in the CaP coatings. TiO 2 nanotubes of amorphous and anatase phases are comparatively studied to determine their effect on the efficiency of CaP formation and the phase transformation among CaP species in prolonged Deposition time. It is found the composition of CaP coating has a strong dependency on the crystal structure of TiO 2 substrate and the kinetics (Deposition time).