Featured Research

from universities, journals, and other organizations

Material tested could guarantee body protheses for more than 150 years

Date:
February 23, 2010
Source:
Elhuyar Fundazioa
Summary:
Current body prostheses do not last more than 10-15 years. After this time, the operation has to be repeated in order to change prosthesis. It is usually problematic as, in general, it is elderly people that use the procedure. New research from Spain may well mean the first step to solving this problem.

Current body prostheses do not last more than 10-15 years. After this time, the operation has to be repeated in order to change prosthesis. 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 Sebastiαn, has just published her PhD, a thesis which may well mean the first step to solving this problem. According to Garmendia, using a ceramic material called zirconia (ZrO2), carbon nanotubes and nanoparticles of zirconia, a prosthesis 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." Garmendia wished to show that the aging and cracking of prostheses 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 synthesis). This coating functioned as a bridge between the zirconia matrix and the nanotubes.

Garmendia explained in her thesis that working at a nanometric scale is precisely the key to achieving long-lasting prostheses. 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, Garmendia investigated the capacity for the displacement and dispersion of the composite obtained from the previous process, and also looked for its suitable point of density. Based on this and aided by plaster, she achieved the first compact pieces.

Subsequently, Garmendia specified the number of coated nanotubes each piece had to have in order to achieve the optimum density at the end of the process. According to the researcher, adding zirconia nanoparticles to the nanotubes facilitates the dispersion of the material and reduces its viscosity, apart from helping to increase its density for the next and last stage: the synterization stage. Synterization is a process, used particularly in ceramics, in order to transform the material from powder to a compact solid. Not just any quantity is useful to achieve this maximum possible density and, thus, before synterization, it has to be decided how many nanotubes are to be introduced and, of course, synterization has to be subsequently carried out correctly.

As Garmendia calculated, if the intention is to obtain the maximum possible density (98%), in order to start the composition, 1% of its volume must be of coated nanotubes. Finally, the material has to be synterized in argon for one hour at 1,300 degrees; not more nor less.


Story Source:

The above story is based on materials provided by Elhuyar Fundazioa. Note: Materials may be edited for content and length.


Cite This Page:

Elhuyar Fundazioa. "Material tested could guarantee body protheses for more than 150 years." ScienceDaily. ScienceDaily, 23 February 2010. <www.sciencedaily.com/releases/2010/02/100223101430.htm>.
Elhuyar Fundazioa. (2010, February 23). Material tested could guarantee body protheses for more than 150 years. ScienceDaily. Retrieved September 22, 2014 from www.sciencedaily.com/releases/2010/02/100223101430.htm
Elhuyar Fundazioa. "Material tested could guarantee body protheses for more than 150 years." ScienceDaily. www.sciencedaily.com/releases/2010/02/100223101430.htm (accessed September 22, 2014).

Share This



More Matter & Energy News

Monday, September 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Company Copies Keys From Photos

Company Copies Keys From Photos

Newsy (Sep. 22, 2014) — A new company allows customers to make copies of keys by simply uploading a couple of photos. But could it also be great for thieves? Video provided by Newsy
Powered by NewsLook.com
Rockefeller Oil Heirs Switching To Clean Energy

Rockefeller Oil Heirs Switching To Clean Energy

Newsy (Sep. 22, 2014) — The Rockefellers — heirs to an oil fortune that made the family name a symbol of American wealth — are switching from fossil fuels to clean energy. Video provided by Newsy
Powered by NewsLook.com
Raw: SpaceX Rocket Carries 3-D Printer to Space

Raw: SpaceX Rocket Carries 3-D Printer to Space

AP (Sep. 22, 2014) — A SpaceX Rocket launched from Cape Canaveral, carrying a custom-built 3-D printer into space. NASA envisions astronauts one day using the printer to make their own spare parts. (Sept. 22) Video provided by AP
Powered by NewsLook.com
Inside London's Massive Sewer Tunnel Project

Inside London's Massive Sewer Tunnel Project

AP (Sep. 22, 2014) — Billions of dollars are being spent on a massive super sewer to take away London's vast output of waste, which is endangering the River Thames. (Sept. 22) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins