FAB-HETERO-COATS · Fabrication of novel Heterophase ta-C:Me Nanocomposite Coatings for biomedical applications
6РП — Действия „Мария Кюри“
- Период
- 2006-02-01 → 2008-11-30
- Финансиране от ЕС
- 266 238 €
- Участници
- 2
- Схема
- OIF
Линиите свързват координатора с партньорите.
Накратко на български
Биосъвместими покрития от въглерод, смесени с метали като сребро, злато или мед, се тестват чрез различни методи за нанасяне. Тези материали помагат за подобряване на антибактериалните свойства и проводимостта на имплантите за медицински приложения.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Final Activity Report Summary - FAB-HETERO-COATS (Fabrication of Novel Heterophase ta-C: Me Nanocomposite Coatings for Biomedical Applications)
We studied biocompatible diamond-like carbon (DLC) coatings that were manufactured using a novel plasma ion immersion implantation and deposition (PIIID) technique. We manufactured novel biocompatible coatings based on DLC and alloyed it with silver, which was known to have a strong antibacterial efficacy. Samples with different concentrations of the alloying element were prepared. In this study, we also compared the biocompatibility and mechanical properties of nanocomposite of the prepared hydrogenated and hydrogen-free DLC-Ag coatings using two different deposition techniques: 1. dual cathode pulsed cathodic-arc (PCA) from silver and graphite cathodes; and 2. Ag cathodic-arc in reactive methane (CH4) atmosphere. Moreover, we examined the formation of nanocomposite films which were formed when different metals such as Mo, Au, Ag, or Cu were inserted into a carbon host matrix. A novel 'selective bias' filter-cathodic-arc deposition method that allowed the co-deposition of C and various metal ions without creating heavy-ion damage and re-sputtering was used for this purpose. The addition of metal increased the conductivity of the films. Copper, however, showed some anomalous behaviour due to the formation of Cu2O nanocrystals. The effective optical bandgap of the films depended on the metal element, with Mo having the least effect and Au the greatest. Mo tended to form carbides in the film at higher doses, limiting its incorporation as nanoclusters. Structural analysis by the X-ray absorption near edge structure (XANES) techniques using synchrotron radiation showed that the C host matrix was not affected by the nanocomposite formation; however some stress might appear for high doses of Au and Cu. Annealing at 300 degrees Celsius caused graphitisation, increased the conductivity and lowered the stress.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
As the average age of us "European nationals" increases, the demand for major joint replacements is expected to rise in accordance. Although implants are considered an excellent solution to many health problems, any time a medical device is implanted in to one's body there is a high risk for infection not only in the short but in the medium term as well. Additionally, the long-term wear behaviour of the surfaces in contact significantly affects the life of implants. In this manner, there is a need for new multifunctional coatings. In comparison with other implant materials, tetrahedral amorphous carbon (ta-C) has excellent blood and tissue biocompatibilities and therefore many artificial joints and cardiovascular implants are being coated today with ta-C materials. Recent studies have shown the possibility of incorporating certain toxic elements (e.g. Cu, Ag, or V) into hard carbon coatings with the idea of providing the implants with necessary infection resistance.However, until now, these coatings could only be deposited either by hybrid pulsed laser deposition (PLD) techniques or by multi-step processes, making their manufacturing expensive and unrealistic. We propose to investigate the development, the mechanical properties and wear behaviour of heterophase ta-C: Me nanocomposite coatings deposited from two pulsed cathodic arc (PCA) plasma sources.One of the advantages of this novel deposition method over hybrid PLD techniques is its potential application to large surface areas and a comparatively less expensive technology while producing an intense highly ionised plasma plume which is necessary for the deposition of the hard ta-C phase. After the deposition, glow discharge optical emission spectroscopy (GDOES) will be used to obtain a quick analysis of t he homogeneity of the metallic phase vs. depth allowing us to adjust the process parameters and improve the manufacture and design of novel ta-C: Me coatings.
Оригинален текст от CORDIS (на английски).
Участници
- CONSEJO SUPERIOR DE INVESTIGACIONES CIENTÃFICAS · MADRIDКоординаторИспания
- LAWRENCE BERKELEY NATIONAL LABORATORY · BERKELEY, CAСъединени щати
Връзки
Данни: CORDIS, © Европейски съюз