The Experts below are selected from a list of 99 Experts worldwide ranked by ideXlab platform
Seonghyeon Hong - One of the best experts on this subject based on the ideXlab platform.
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biomimetic apatite coatings on micro arc oxidized titania
Biomaterials, 2004Co-Authors: Wonhoon Song, Younki Jun, Yong Han, Seonghyeon HongAbstract:Abstract Biomimetic apatite coatings on micro-arc oxidized titania films were investigated and their apatite-inducing ability was evaluated in a simulated body fluid (1.0SBF) as well as in a 1.5 times concentrated SBF (1.5SBF). Titania-based films on titanium were prepared by micro-arc oxidation at various applied voltages (250–500 V) in an electrolytic solution containing β -glycerophosphate disodium salt pentahydrate ( β -GP) and Calcium Acetate Monohydrate (CA). Macro-porous, Ca- and P-containing titania-based films were formed on the titanium substrates. The phase, Ca and P content, morphology, and thickness of the films were strongly dependent on the applied voltage. In particular, Ca- and P-containing compounds such as CaTiO 3 , β -Ca 2 P 2 O 7 and α -Ca 3 (PO 4 ) 2 were produced at higher voltages (>450 V). When immersed in 1.0SBF, a carbonated hydroxyapatite was induced on the surfaces of the films oxidized at higher voltages (>450 V) after 28 days, which is closely related to the Ca- and P-containing phases. The use of 1.5SBF shortened the apatite induction time and apatite formation was confirmed even on the surface of the films oxidized at 350 V, which suggests that the incorporated Ca and P in the titania films play a similar role to the Ca- and P-containing compounds in the SBF.
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biomimetic apatite coatings on micro arc oxidized titania
Biomaterials, 2004Co-Authors: Wonhoon Song, Younki Jun, Yong Han, Seonghyeon HongAbstract:Biomimetic apatite coatings on micro-arc oxidized titania films were investigated and their apatite-inducing ability was evaluated in a simulated body fluid (1.0 SBF) as well as in a 1.5 times concentrated SBF (1.5 SBF). Titania-based films on titanium were prepared by micro-arc oxidation at various applied voltages (250-500 V) in an electrolytic solution containing beta-glycerophosphate disodium salt pentahydrate (beta-GP) and Calcium Acetate Monohydrate (CA). Macro-porous, Ca- and P-containing titania-based films were formed on the titanium substrates. The phase, Ca and P content, morphology, and thickness of the films were strongly dependent on the applied voltage. In particular, Ca- and P-containing compounds such as CaTiO3, beta-Ca2P2O7 and alpha-Ca3(PO4)2 were produced at higher voltages (>450 V). When immersed in 1.0 SBF, a carbonated hydroxyapatite was induced on the surfaces of the films oxidized at higher voltages (>450 V) after 28 days, which is closely related to the Ca- and P-containing phases. The use of 1.5 SBF shortened the apatite induction time and apatite formation was confirmed even on the surface of the films oxidized at 350 V, which suggests that the incorporated Ca and P in the titania films play a similar role to the Ca- and P-containing compounds in the SBF.
Yong Han - One of the best experts on this subject based on the ideXlab platform.
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biomimetic apatite coatings on micro arc oxidized titania
Biomaterials, 2004Co-Authors: Wonhoon Song, Younki Jun, Yong Han, Seonghyeon HongAbstract:Abstract Biomimetic apatite coatings on micro-arc oxidized titania films were investigated and their apatite-inducing ability was evaluated in a simulated body fluid (1.0SBF) as well as in a 1.5 times concentrated SBF (1.5SBF). Titania-based films on titanium were prepared by micro-arc oxidation at various applied voltages (250–500 V) in an electrolytic solution containing β -glycerophosphate disodium salt pentahydrate ( β -GP) and Calcium Acetate Monohydrate (CA). Macro-porous, Ca- and P-containing titania-based films were formed on the titanium substrates. The phase, Ca and P content, morphology, and thickness of the films were strongly dependent on the applied voltage. In particular, Ca- and P-containing compounds such as CaTiO 3 , β -Ca 2 P 2 O 7 and α -Ca 3 (PO 4 ) 2 were produced at higher voltages (>450 V). When immersed in 1.0SBF, a carbonated hydroxyapatite was induced on the surfaces of the films oxidized at higher voltages (>450 V) after 28 days, which is closely related to the Ca- and P-containing phases. The use of 1.5SBF shortened the apatite induction time and apatite formation was confirmed even on the surface of the films oxidized at 350 V, which suggests that the incorporated Ca and P in the titania films play a similar role to the Ca- and P-containing compounds in the SBF.
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biomimetic apatite coatings on micro arc oxidized titania
Biomaterials, 2004Co-Authors: Wonhoon Song, Younki Jun, Yong Han, Seonghyeon HongAbstract:Biomimetic apatite coatings on micro-arc oxidized titania films were investigated and their apatite-inducing ability was evaluated in a simulated body fluid (1.0 SBF) as well as in a 1.5 times concentrated SBF (1.5 SBF). Titania-based films on titanium were prepared by micro-arc oxidation at various applied voltages (250-500 V) in an electrolytic solution containing beta-glycerophosphate disodium salt pentahydrate (beta-GP) and Calcium Acetate Monohydrate (CA). Macro-porous, Ca- and P-containing titania-based films were formed on the titanium substrates. The phase, Ca and P content, morphology, and thickness of the films were strongly dependent on the applied voltage. In particular, Ca- and P-containing compounds such as CaTiO3, beta-Ca2P2O7 and alpha-Ca3(PO4)2 were produced at higher voltages (>450 V). When immersed in 1.0 SBF, a carbonated hydroxyapatite was induced on the surfaces of the films oxidized at higher voltages (>450 V) after 28 days, which is closely related to the Ca- and P-containing phases. The use of 1.5 SBF shortened the apatite induction time and apatite formation was confirmed even on the surface of the films oxidized at 350 V, which suggests that the incorporated Ca and P in the titania films play a similar role to the Ca- and P-containing compounds in the SBF.
Wonhoon Song - One of the best experts on this subject based on the ideXlab platform.
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biomimetic apatite coatings on micro arc oxidized titania
Biomaterials, 2004Co-Authors: Wonhoon Song, Younki Jun, Yong Han, Seonghyeon HongAbstract:Abstract Biomimetic apatite coatings on micro-arc oxidized titania films were investigated and their apatite-inducing ability was evaluated in a simulated body fluid (1.0SBF) as well as in a 1.5 times concentrated SBF (1.5SBF). Titania-based films on titanium were prepared by micro-arc oxidation at various applied voltages (250–500 V) in an electrolytic solution containing β -glycerophosphate disodium salt pentahydrate ( β -GP) and Calcium Acetate Monohydrate (CA). Macro-porous, Ca- and P-containing titania-based films were formed on the titanium substrates. The phase, Ca and P content, morphology, and thickness of the films were strongly dependent on the applied voltage. In particular, Ca- and P-containing compounds such as CaTiO 3 , β -Ca 2 P 2 O 7 and α -Ca 3 (PO 4 ) 2 were produced at higher voltages (>450 V). When immersed in 1.0SBF, a carbonated hydroxyapatite was induced on the surfaces of the films oxidized at higher voltages (>450 V) after 28 days, which is closely related to the Ca- and P-containing phases. The use of 1.5SBF shortened the apatite induction time and apatite formation was confirmed even on the surface of the films oxidized at 350 V, which suggests that the incorporated Ca and P in the titania films play a similar role to the Ca- and P-containing compounds in the SBF.
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biomimetic apatite coatings on micro arc oxidized titania
Biomaterials, 2004Co-Authors: Wonhoon Song, Younki Jun, Yong Han, Seonghyeon HongAbstract:Biomimetic apatite coatings on micro-arc oxidized titania films were investigated and their apatite-inducing ability was evaluated in a simulated body fluid (1.0 SBF) as well as in a 1.5 times concentrated SBF (1.5 SBF). Titania-based films on titanium were prepared by micro-arc oxidation at various applied voltages (250-500 V) in an electrolytic solution containing beta-glycerophosphate disodium salt pentahydrate (beta-GP) and Calcium Acetate Monohydrate (CA). Macro-porous, Ca- and P-containing titania-based films were formed on the titanium substrates. The phase, Ca and P content, morphology, and thickness of the films were strongly dependent on the applied voltage. In particular, Ca- and P-containing compounds such as CaTiO3, beta-Ca2P2O7 and alpha-Ca3(PO4)2 were produced at higher voltages (>450 V). When immersed in 1.0 SBF, a carbonated hydroxyapatite was induced on the surfaces of the films oxidized at higher voltages (>450 V) after 28 days, which is closely related to the Ca- and P-containing phases. The use of 1.5 SBF shortened the apatite induction time and apatite formation was confirmed even on the surface of the films oxidized at 350 V, which suggests that the incorporated Ca and P in the titania films play a similar role to the Ca- and P-containing compounds in the SBF.
Aivaras Kareiva - One of the best experts on this subject based on the ideXlab platform.
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sol gel synthesis phase composition morphological and structural characterization of ca10 po4 6 oh 2 xrd ftir sem 3d sem and solid state nmr studies
Journal of Molecular Structure, 2016Co-Authors: Simonas Kareiva, Vytautas Klimavicius, Aleksandr Momot, Jonas Kausteklis, Aleksandra Prichodko, Laurynas Dagys, Feliksas Ivanauskas, Simas Sakirzanovas, Vytautas Balevicius, Aivaras KareivaAbstract:Abstract Aqueous sol–gel chemistry route based on ammonium–hydrogen phosphate as the phosphorus precursor, Calcium Acetate Monohydrate as source of Calcium ions, and 1,2-ethylendiaminetetraacetic acid (EDTA), or 1,2-diaminocyclohexanetetracetic acid (DCTA), or tartaric acid (TA), or ethylene glycol (EG), or glycerol (GL) as complexing agents have been used to prepare Calcium hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 , CHAp). The phase transformations, composition, and structural changes in the polycrystalline samples were studied by infrared spectroscopy (FTIR), X-ray powder diffraction analysis (XRD), and scanning electron microscopy (SEM). The local short-range (nano- and mezo-) scale effects in CHAp were studied using solid-state NMR spectroscopy. The spatial 3D data from the SEM images of CHAp samples obtained by TA, EG and GL sol–gel routes were recovered for the first time to our knowledge.
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ph impact on the sol gel preparation of Calcium hydroxyapatite ca10 po4 6 oh 2 using a novel complexing agent dcta
Central European Journal of Chemistry, 2010Co-Authors: Irma Bogdanoviciene, Aldona Beganskiene, Kaia Tőnsuaadu, Valdek Mikli, Inga Grigoraviciutepuroniene, Aivaras KareivaAbstract:Aqueous sol-gel chemistry routes — based on ammonium hydrogen phosphate as the phosphorus precursor, Calcium Acetate Monohydrate as the source of Calcium ions, and 1,2-diaminocyclohexanetetraacetic acid Monohydrate (DCTA) as the complexing agent — have been used to prepare Calcium hydroxyapatite (HA). The sol-gel process was performed in aqueous solution at different pH values followed by calcination of the dry precursor gels for 5 h at 1000°C. Phase transformations, composition, and structural changes in the polycrystalline samples were studied by thermoanalytical methods (TG/DTA), infrared spectroscopy (IR), X-ray powder diffraction analysis (XRD), and scanning electron microscopy (SEM). It was shown that pH adjustment has significant impact on the apatite formation process and on the morphology and phase purity of the ceramic samples.
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Calcium hydroxyapatite ca10 po4 6 oh 2 ceramics prepared by aqueous sol gel processing
Materials Research Bulletin, 2006Co-Authors: Irma Bogdanoviciene, Aldona Beganskiene, Kaia Tonsuaadu, Jochen Glaser, Jurgen H Meyer, Aivaras KareivaAbstract:Abstract Aqueous sol–gel chemistry routes based on ammonium–hydrogen phosphate as the phosphorus precursor and Calcium Acetate Monohydrate as source of Calcium ions have been developed to prepare Calcium hydroxyapatite samples with different morphological properties. In the sol–gel processes, an aqueous solutions of ethylene diamine tetra-acetic acid (EDTA) or tartaric acid (TA) as complexing agents were added to the reaction mixture. The monophasic Ca 10 (PO 4 ) 6 (OH) 2 samples were obtained by calcination of precursor gels for 5 h at 1000 °C. The phase transformations, composition and micro-structural features in the polycrystalline samples were studied by thermoanalytical methods (TGA/DTA), infrared spectroscopy (IR), X-ray powder diffraction analysis (XRD) and scanning electron microscopy (SEM). It was shown that adjusting the nature of complexing agent in the aqueous sol–gel processing can be used to control the morphology of the ceramic samples.
Younki Jun - One of the best experts on this subject based on the ideXlab platform.
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biomimetic apatite coatings on micro arc oxidized titania
Biomaterials, 2004Co-Authors: Wonhoon Song, Younki Jun, Yong Han, Seonghyeon HongAbstract:Abstract Biomimetic apatite coatings on micro-arc oxidized titania films were investigated and their apatite-inducing ability was evaluated in a simulated body fluid (1.0SBF) as well as in a 1.5 times concentrated SBF (1.5SBF). Titania-based films on titanium were prepared by micro-arc oxidation at various applied voltages (250–500 V) in an electrolytic solution containing β -glycerophosphate disodium salt pentahydrate ( β -GP) and Calcium Acetate Monohydrate (CA). Macro-porous, Ca- and P-containing titania-based films were formed on the titanium substrates. The phase, Ca and P content, morphology, and thickness of the films were strongly dependent on the applied voltage. In particular, Ca- and P-containing compounds such as CaTiO 3 , β -Ca 2 P 2 O 7 and α -Ca 3 (PO 4 ) 2 were produced at higher voltages (>450 V). When immersed in 1.0SBF, a carbonated hydroxyapatite was induced on the surfaces of the films oxidized at higher voltages (>450 V) after 28 days, which is closely related to the Ca- and P-containing phases. The use of 1.5SBF shortened the apatite induction time and apatite formation was confirmed even on the surface of the films oxidized at 350 V, which suggests that the incorporated Ca and P in the titania films play a similar role to the Ca- and P-containing compounds in the SBF.
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biomimetic apatite coatings on micro arc oxidized titania
Biomaterials, 2004Co-Authors: Wonhoon Song, Younki Jun, Yong Han, Seonghyeon HongAbstract:Biomimetic apatite coatings on micro-arc oxidized titania films were investigated and their apatite-inducing ability was evaluated in a simulated body fluid (1.0 SBF) as well as in a 1.5 times concentrated SBF (1.5 SBF). Titania-based films on titanium were prepared by micro-arc oxidation at various applied voltages (250-500 V) in an electrolytic solution containing beta-glycerophosphate disodium salt pentahydrate (beta-GP) and Calcium Acetate Monohydrate (CA). Macro-porous, Ca- and P-containing titania-based films were formed on the titanium substrates. The phase, Ca and P content, morphology, and thickness of the films were strongly dependent on the applied voltage. In particular, Ca- and P-containing compounds such as CaTiO3, beta-Ca2P2O7 and alpha-Ca3(PO4)2 were produced at higher voltages (>450 V). When immersed in 1.0 SBF, a carbonated hydroxyapatite was induced on the surfaces of the films oxidized at higher voltages (>450 V) after 28 days, which is closely related to the Ca- and P-containing phases. The use of 1.5 SBF shortened the apatite induction time and apatite formation was confirmed even on the surface of the films oxidized at 350 V, which suggests that the incorporated Ca and P in the titania films play a similar role to the Ca- and P-containing compounds in the SBF.