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Material tested that could guarantee body protheses for more than 150 years
Date:2/23/2010

Current body protheses do not last more than 10-15 years. After this time, the operation has to be repeated in order to change prothesis. It is usually problematic as, in general, it is elderly people that use the procedure. Researcher Nere Garmendia, based in the Basque city of Donostia-San Sebastin, has just published her PhD, a thesis which may well mean the first step to solving this problem. According to Ms Garmendia, using a ceramic material called zirconia (Zr02), carbon nanotubes and nanoparticles of zirconia, a prothesis that will last more than 150 years can be produced.

The PhD thesis is titled Development of a new nanocompound material made of zirconia with coated carbon nanotubes, for orthopaedic applications. Ms Garmendia wished to show that the ageing and cracking of protheses could be avoided. To begin with, carbon nanotubes were added to the zirconia matrix a technique that greatly strengthens its resistance. With this composite material as a base research was initiated.

The researcher reinforced the connection between the zirconia matrix and the nanotubes, with the intention of improving the transfer/distribution of loads. The nanotubes were coated with nanoparticles of zirconia and, in order for this to be effected, the nanoparticles were heated beyond their boiling point (hydrothermal synhtesis). This coating functioned as a bridge between the zirconia matrix and the nanotubes.

Ms Garmendia explained in her thesis that working at a nanometric scale is precisely the key to achieving long-lasting protheses. In a prior experiment with micrometric zirconia it was concluded that this material would end up considerably aged after 12 years. Nevertheless, as has been pointed out, apart from the zirconia matrix, adding carbon nanotubes and the nanoparticles of zirconia coating them, the material will not age -even after 150 years.

The maximum possible density

With the nanotubes coated, Ms Ga
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Contact: Amaia Portugal
a.portugal@elhuyar.com
34-943-363-040
Elhuyar Fundazioa
Source:Eurekalert

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