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  • 1
    Electronic Resource
    Electronic Resource
    Characterization and Dissolution Behavior in a Physiological Solution of Heat-Treated CaTiO〈sub〉3〈/sub〉 Thin Films with Different Thicknesses (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 127 (Sept. 2007), p. 209-214 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Characterization of heat-treated CaTiO3 thin films of 10, 20, 30 and 50 nm in thicknessand their change after immersion in a simulated body fluid were investigated by grazing incidentangle X-ray diffractometry and Auger electron spectroscopy (AES). The CaTiO3 films wereprepared on titanium substrate by sputter-deposition of CaTiO3 target followed by heating in anelectric furnace at 873 K in air for 7.2 ks. The CaTiO3 films were immersed in 0.8% NaCl solutionfor 14 d. All the films before heat treatment were non-crystallized films and after heat treatment,only the 50-nm film was crystallized to perovskite-type CaTiO3. In AES in-depth profiles afterheating, Ca diffusion was not observed in the 50-nm film, whereas Ca diffusion toward the Tisubstrate was observed in the 10-, 20- and 30-nm films. After immersion for 14 d, the vicinity ofsurface of the 10, 20 and 30 nm thick CaTiO3 films were dissolved into the NaCl solution, while the50-nm thick CaTiO3 film was scarcely dissolved. Since dissolution from biomaterials in a humanbody has possibility to harm, the CaTiO3 film should be deposited more than 50 nm in thicknessand heat-treated at 873 K
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.127.209.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    A New Technique of Titanium and Segmented Polyurethane Complex through 3-(Trimethoxysilyl) Propylmethacrylate for Artificial Implants (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 125-128 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.125.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Immobilization of Poly(Ethylene Glycol) Terminated with Amine to Titanium Surface by Electrodeposition (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 205-208 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In many applications such as catheters, artificial blood vessels and diagnostic sensors,blood compatibility or prevention of adhesion of platelet is required. The preferred way to controlthese purposes is to eliminate or drastically reduce the adsorption of proteins. Surface modificationwith Poly(ethylene glycol), PEG has long been known to reduce undesirable protein adsorption. Notechnique for the immobilization of PEG to base metal has been developed. In this study, PEGterminated at both terminals or one terminal with amine bases was immobilized onto titaniumsurface by immersion or electrodeposition. The bonding manners of PEG onto titanium, whichinvolve directionality of terminated amines and chemical bonding states of interface between thedeposited PEG layer and TiO2, were characterized using X-ray photoelectron spectroscopy, XPS.As a result, terminated amines locate inside of the PEG layer and combine mainly with TiO2 asstable NHO by electrodeposition, while amines randomly exist and show mainly unstable bondingwith TiO2 by immersion. Moreover, the difference of amine termination leads to different bondingmanners, U-shape in PEG terminated both terminals and brush in PEG terminated one terminal.This immobilization process is one-stage convenient technique and useful for all electroconductiveand morphological materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.205.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Biofunctionalization of Metal Surface by Immobilization of Poly(Ethylene Glycol) Terminated Amine (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 765-768 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In many biomedical devices such as catheters and diagnostic sensors, blood compatibilityis required. The best way to control this property is to prevent or drastically reduce the adsorption ofproteins. Poly(ethylene glycol) terminated amine at both terminals, NH2-PEG-NH2, is immobilizedon a commercially pure titanium, a 316L austenitic stainless steel, and acobalt-chromium-molybdenum alloy with immersion or electrodeposition. Chemical bonding statesat the interface and orientation of PEG molecules were characterized using X-ray photoelectronspectroscopy, glow discharge optical emission spectroscopy, and Fourie-transformed infraredspectrometer with a reflection absorption spectrometer. As a result, NH2-PEG-NH2 was immobilizedonto metal surface as a U-shape mainly with stable NHO bonding in electrodeposition. In the case ofelectrodepostion, the concentration of active surface hydroxyl groups on surface oxide film played animportant role in the immobilization
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.765.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Biofunctional Hybrid of Titanium with Polymers (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 563-566 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Application of metals will be expanded to new medical devices, scaffold for tissueengineering, artificial organs, etc. with the addition of biofunction. Therefore, immobilization orcombination of functional polymers to metals is significant subject for the application of metals tobiofunctional materials and sensors. Metal-polymer hybrid materials are promising biomaterialsfuture, especially for artificial organs. To form metal-polymer hybrid for biomedical devices, twotechniques are predominant according to the purpose: Immobilization of biofunctional polymers tometals and bonding of biopolymers with metals. In the first case, poly(ethylene glycol: PEG) is abiofuctional molecule on which adsorption of proteins is inhibited. Control of immobilization modeof PEG modified with NH2 to titanium surface by electrodeposition is feasible and the adsorption ofproteins is inhibited by the deposited PEG. This technique could be applied to all metallic materials.In the other case, we attempted to form a composite of titanium with segmentated polyurethane (SPU)thorough silane-coupling agent (γ-MPS). This composite material is applied to texture of titaniumcovered by SPU as artificial organs
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.563.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of Cross-Linkage and Hydroxyl Groups on Bonding Strength between Titanium and Segmented Polyurethane through 3-(Trimethoxysilyl) Propyl Methacrylate (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 1477-1480 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: To create a new material with good biocompatibility and high mechanical strength forartificial organs, titanium (Ti) and segmented polyurethane (SPU) were bonded through3-(trimethoxysilyl) propyl methacrylate (γ-MPS), and specify causes governing the bonding strengthof Ti/γ-MPS/SPU interface. The number of cross-links of SPU and the concentration of activehydroxyl groups on the surface oxide film of Ti were controlled by UV-irradaiton and hydrogenperoxide immersion. The number of cross-links of SPU was measured by differential scanningcalorimetry (DSC) and the concentration of the active hydroxyl groups was also determined using azinc-complex substitution technique. Consequently, Ti/γ-MPS/SPU shear bonding stress wasincreased with the increase of the number of cross-links of SPU. In addition, the increase ofcross-links in SPU also improved the Ti/γ-MPS/SPU shear bonding stress
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1477.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Recent Development of New Alloys for Biomedical Use (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 512 (Apr. 2006), p. 243-248 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Metallic materials are widely used in medicine not only for orthopedic implants but also for cardiovascular devices and other purposes. New alloys for biomedical use are developed all over the world continuously to decrease corrosion, toxicity and fracture during implantation and increase interfacial and dynamical tissue compatibility. Most of efforts are made to develop titanium alloys,especially in β-type alloys whose Young’s modulus is as low as cortical bone. Nickel-free alloy is also necessary to prevent nickel allergy: nickel-free austenitic stainless steels and shape memory alloys are developed. To increase iocompatibility, the controls of surface morphology and surface treatment or modification are necessary
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.512.243.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Calcium Phosphate Precipitation by Galvanic Current between Titanium and Gold in Pseudo-Body Fluid (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 653-656 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: For commercialized dental implants, to enhance the bone bonding of the artificial toothroots, several kinds of surface modification techniques, such as hydroxy-apatite coating, anodicoxidation and sand-blasting, have been developed. Apart from the surface modification, it is knownthat the bone growth is accelerated by electric stimulations in the living body. In the present study, thegalvanic current between titanium substrate and gold coating partially on the titanium implants wasapplied to enhance calcium phosphate precipitation in a pseudo-body fluid namely Hanks’ solution.The galvanic current between titanium specimens and gold electrode jumped up approximately 0.2 safter put into Hanks’ solution and the current has decreased asymptotically. With such consideration,the desirable conditions of surface modification by gold coating were presented to provide suitablegalvanic current density enhancing calcium phosphate precipitation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.653.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Corrosion Behavior of Zirconium Based Alloys in Simulated Body Fluids (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 1489-1492 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The corrosion behavior of Zr-Ti and Zr-Hf alloys with various concentrations in properlydeaerated Hanks’ solution were investigated by electrochemical techniques. The effects of thethermal treatment with the purpose of homogenization of chemical composition on the pittingpotentials of the Zr-Ti alloys were also examined. The results indicated that sufficient addition of Tito Zr improved its corrosion resistance, especially in terms of the pitting potential and the passivecurrent density. On the other hand, addition of Hf totally lowered the corrosion resistance of the alloy.The thermal treatment improved the pitting corrosion property of Zr-Ti alloys, and Zr alloys withover 5mol% Ti showed much higher pitting potentials than that of pure Zr. The treatment alsoimproved the reproducibility of the measurement and narrowed the data scattering. This phenomenonwas discussed with the model of rapidly-cooled metallographic structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1489.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    New Manufacturing Process of Nickel-Free Austenitic Stainless Steel with Nitrogen Absorption Treatment (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 1085-1088 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Ingots of ferritic stainless steels, Fe-24Cr and Fe-24Cr-2Mo in mass%, were worked tovarious dimensions for test specimens. Nitrogen was absorbed by the specimens in a furnace filledwith nitrogen gas with a pressure of 101.3 kPa at 1473 K to develop a simple and convenientmanufacturing process of nickel-free austenitic stainless steels. Ferritic Fe-24Cr and Fe-24Cr-2Mowere austenitized with nitrogen absorption to a 2-mm depth from the surface. The hardness, tensilestrength, 0.2% proof stress, and elongation to fracture increased, and the reduction of area decreasedin the alloys by austenitization due to nitrogen absorption. The tensile strength and 0.2% proof stressof these alloys with nitrogen absorption for 129.6 ks were much larger than those of 316L steel, whilethe elongation to fracture was much smaller than that of 316L steel. Therefore, small devices and partswith a maximum thickness or diameter of 4 mm were manufactured with this process in this study
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.1085.pdf
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