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Self Healing Surfaces Under Development

August 5th, 2009 Medgadget Editors News


German researchers have been working on creating synthetic surfaces capable of healing themselves similar to how skin rejuvenates itself after an injury. By creating an electroplated layer that encompasses tiny fluid filled pockets, the new material has the property of releasing the liquid within the pockets after a scratch. This liquid in turn fills in the scratch to repair the surface back to new.
Press office at Fraunhofer-Gesellschaft Institute explains:

The idea behind this is to introduce evenly distributed fluid-filled capsules into the electroplated layer – rather like raisins in a cake. If the layer is damaged, the pellets at the point of damage burst, the fluid runs out and ‘repairs’ the scratch. Until now, these plans have failed due to the size of the capsules – at 10 to 15 micrometers they were too large for the electroplated layer, which is around 20 micrometers thick. The capsules altered the mechanical properties of the layer.
Researchers from the Fraunhofer Institute for Manufacturing Engineering and Automation IPA in Stuttgart, together with colleagues from Duisburg-Essen University, have developed a process for producing electroplated layers with nano-capsules, in a project being financed by the Volkswagen Foundation. At only a few hundred nanometers in diameter, the capsules are measured on another scale entirely, compared with previous results. “The challenge lies in not damaging the capsules when producing the electroplated layer”, says Dr. Martin Metzner, Head of Department at IPA. “The smaller the capsules, the thinner and more sensitive their casing. The electrolytes used for these electroplated-technical processes are extremely aggressive chemically and can easily destroy the capsules”. The researchers therefore had to find a compatible material for the capsule casing depending on the electrolytes used.
The researchers have produced the first copper, nickel and zinc coatings with the new capsules, although surface coverage does not extend beyond the centimeter scale. Experts estimate that it will be another one and a half to two years before whole components can be coated. In a further step the team worked on more complex systems – involving differently filled capsules, for example, whose fluids react with one another like a two component adhesive.

Press release: Self-healing surfaces…

Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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