The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
D. B. Haddow - One of the best experts on this subject based on the ideXlab platform.
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Characterization of sol-gel surfaces for biomedical applications
Journal of Materials Science: Materials in Medicine, 1996Co-Authors: D. B. Haddow, P. F. James, R. NoortAbstract:The aim of the present study was to characterize sol-gel derived titania coatings prepared by dipping. The surface characterization was carried out using X-ray photoelectron spectroscopy (XPS) and time of flight secondary ion mass spectrometry (ToF SIMS), combined with X-ray diffraction (XRD) and thermal analysis. Sol-gel derived titania surfaces mimicked the surface chemistry of the Natural Oxide Layer found on commercial titanium implants. These surfaces could be used to develop an in vitro model of the osseointegration process. Similar analytical techniques were applied to apatite-like coatings and preliminary results suggest that hydroxyapatite coatings can be produced from a sol-gel route.
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Synthetic implant surfaces: 1. The formation and characterization of sol-gel titania films
Biomaterials, 1996Co-Authors: D. B. Haddow, S. Kothari, Peter F. James, Robert D. Short, Paul V. Hatton, R. Van NoortAbstract:Sol-gel has been used to prepare thin titania films. We have investigated the effects of dip rate, sintering temperature and time on the chemical composition of the films, their physical structure and thickness, and adherence to a silica substrate. Our aim has been to produce films that mimic as closely as possible the Natural Oxide Layer that is found on titanium. These films are to be used as substrates in an in vitro model of osseointegration.
J Breme - One of the best experts on this subject based on the ideXlab platform.
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Corrosion behaviour, metal release and biocompatibility of implant materials coated by TiO2-sol gel chemistry
Biomedizinische Technik. Biomedical engineering, 2005Co-Authors: Bettina Hoffmann, Andreas Kokott, O Shafranska, R Detsch, S Winter, E Eisenbarth, K Peters, J Breme, C. J Kirkpatrick, G ZieglerAbstract:Alloys based on titanium or cobalt have been used as implant materials for decades with good success. Because of their Natural Oxide Layer these alloys reveal good corrosion behaviour. In contact with physiological solution metal release takes place, which can cause inflammation. Coatings can improve the corrosion behaviour. In this study Ti6Al4V and Co28Cr6Mo alloys, which are frequently used as implant materials, were tested. Polished discs of these alloys and polished discs, which were coated with TiO2-Layers by sol-gel chemistry, were compared regarding their corrosion behaviour and metal ion releasing. The releasing of Al, V, Ti, Co, Cr and Mo was quantified by ICP-MS analysis. The TiO2-coating reduced the release of all ions except of the Al-ion. Both alloys showed a deviating kinetic of ion releasing. In addition, cell response (cell vitality, cell proliferation, endothelial marker CD31 and actin allocation) of osteoblasts and endothelial cells were investigated.
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preparation of tio2 Layers on cp ti and ti6al4v by thermal and anodic oxidation and by sol gel coating techniques and their characterization
Journal of Biomedical Materials Research, 2002Co-Authors: D Velten, V Biehl, F Aubertin, B Valeske, W Possart, J BremeAbstract:The excellent biocompatibility of titanium and its alloys used, for example, for medical devices, is associated with the properties of their surface Oxide. For a better understanding of the tissue reaction in contact with the Oxide Layer, knowledge of the chemical and physical properties of this Layer is of increasing interest. In this study, titania films were produced on cp-Ti and Ti6Al4V substrates by thermal oxidation, anodic oxidation, and by the sol-gel process. The thickness and structure of the films produced under different conditions were determined by ellipsometry, infrared spectroscopy, and X-ray diffraction measurements. The corrosion properties of these Layers were investigated by current density–potential curves under physiological conditions. The Oxide Layers produced on cp-Ti and Ti6Al4V by thermal oxidation consist of TiO2 in the rutile structure. For the anodized samples the structure of TiO2 is a mixture of amorphous phase and anatase. The structure of the coatings produced by the sol-gel process for a constant annealing time depends on the annealing temperature, and with increasing temperature successively amorphous, anatase, and rutile structure is observed. Compared to the uncoated, polished substrate with a Natural Oxide Layer, the corrosion resistance of cp-Ti and Ti6Al4V is increased for the samples with an Oxide Layer thickness of about 100 nm, independent of the oxidation procedure. © 2001 Wiley Periodicals, Inc. J Biomed Mater Res 59: 18–28, 2002
R. Van Noort - One of the best experts on this subject based on the ideXlab platform.
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Synthetic implant surfaces: 1. The formation and characterization of sol-gel titania films
Biomaterials, 1996Co-Authors: D. B. Haddow, S. Kothari, Peter F. James, Robert D. Short, Paul V. Hatton, R. Van NoortAbstract:Sol-gel has been used to prepare thin titania films. We have investigated the effects of dip rate, sintering temperature and time on the chemical composition of the films, their physical structure and thickness, and adherence to a silica substrate. Our aim has been to produce films that mimic as closely as possible the Natural Oxide Layer that is found on titanium. These films are to be used as substrates in an in vitro model of osseointegration.
R. Noort - One of the best experts on this subject based on the ideXlab platform.
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Characterization of sol-gel surfaces for biomedical applications
Journal of Materials Science: Materials in Medicine, 1996Co-Authors: D. B. Haddow, P. F. James, R. NoortAbstract:The aim of the present study was to characterize sol-gel derived titania coatings prepared by dipping. The surface characterization was carried out using X-ray photoelectron spectroscopy (XPS) and time of flight secondary ion mass spectrometry (ToF SIMS), combined with X-ray diffraction (XRD) and thermal analysis. Sol-gel derived titania surfaces mimicked the surface chemistry of the Natural Oxide Layer found on commercial titanium implants. These surfaces could be used to develop an in vitro model of the osseointegration process. Similar analytical techniques were applied to apatite-like coatings and preliminary results suggest that hydroxyapatite coatings can be produced from a sol-gel route.
D Velten - One of the best experts on this subject based on the ideXlab platform.
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preparation of tio2 Layers on cp ti and ti6al4v by thermal and anodic oxidation and by sol gel coating techniques and their characterization
Journal of Biomedical Materials Research, 2002Co-Authors: D Velten, V Biehl, F Aubertin, B Valeske, W Possart, J BremeAbstract:The excellent biocompatibility of titanium and its alloys used, for example, for medical devices, is associated with the properties of their surface Oxide. For a better understanding of the tissue reaction in contact with the Oxide Layer, knowledge of the chemical and physical properties of this Layer is of increasing interest. In this study, titania films were produced on cp-Ti and Ti6Al4V substrates by thermal oxidation, anodic oxidation, and by the sol-gel process. The thickness and structure of the films produced under different conditions were determined by ellipsometry, infrared spectroscopy, and X-ray diffraction measurements. The corrosion properties of these Layers were investigated by current density–potential curves under physiological conditions. The Oxide Layers produced on cp-Ti and Ti6Al4V by thermal oxidation consist of TiO2 in the rutile structure. For the anodized samples the structure of TiO2 is a mixture of amorphous phase and anatase. The structure of the coatings produced by the sol-gel process for a constant annealing time depends on the annealing temperature, and with increasing temperature successively amorphous, anatase, and rutile structure is observed. Compared to the uncoated, polished substrate with a Natural Oxide Layer, the corrosion resistance of cp-Ti and Ti6Al4V is increased for the samples with an Oxide Layer thickness of about 100 nm, independent of the oxidation procedure. © 2001 Wiley Periodicals, Inc. J Biomed Mater Res 59: 18–28, 2002
