Obiettivo The near equiatomic intermetallic nickel titanium (NiTi) has remarkable properties. It is a shape memory alloy that exhibits considerable super-elasticity. Super-elastic NiTi is of special interest as it has elastic properties which are far closer to bone than conventional metallic materials. Although concerns have been expressed regarding the high quantity of potentially toxic nickel in the metal; a wide range of studies have shown that nickel release from these alloys is low and poses little risk to patients.The biocompatibility of NiTi is attributed to the formation of a highly corrosion resistant titania surface film. In recent years considerable research has been carried out into mechanisms for increasing the biocompatibility of titanium by modifying the surface chemistry of the metal to enhance the growth of hydroxyapatite phases on the surface. It has been shown that a wide variety of surface modification techniques may be employed to this end.This proposal aims to extend the work carried out on Ti to NiTi surfaces. The modification procedures proposed are combined alkali and heat treatments and calcium ion implantation. It is vital that any surface modification does not compromise the passive titanium oxide film resulting in increased ion release. Therefore, it is proposed to monitor the properties and form of the oxide film using X-ray photoelectron spectroscopy (conventional and depth profiling), secondary ion mass spectrometry (static and dynamic), white light interferometry, goniometry and ion-chromatography. Bioactivity of the resulting surfaces will be assessed by measuring the ability to precipitate calcium phosphates from simulated body fluid and the performance of osteoblast cells on the surfaces. Campo scientifico scienze naturaliscienze chimicheelettrochimicaelettrolisiscienze naturaliscienze chimichechimica inorganicametalli di transizionescienze naturaliscienze fisicheastronomiaplanetologiageologia planetariascienze naturaliscienze chimichechimica inorganicametalli alcalino terrosiscienze naturaliscienze chimichechimica analiticaspettrometria di massa Programma(i) FP6-MOBILITY - Human resources and Mobility in the specific programme for research, technological development and demonstration "Structuring the European Research Area" under the Sixth Framework Programme 2002-2006 Argomento(i) MOBILITY-2.1 - Marie Curie Intra-European Fellowships (EIF) Invito a presentare proposte FP6-2004-MOBILITY-5 Vedi altri progetti per questo bando Meccanismo di finanziamento EIF - Marie Curie actions-Intra-European Fellowships Coordinatore UNIVERSITY COLLEGE LONDON Indirizzo Gower street London Regno Unito Mostra sulla mappa Collegamenti Sito web Opens in new window Contributo UE Nessun dato
