Unlike human skin, materials such as metals do not self-heal. For example, if electroplated layer protecting the metals from corrosion is scratched, it will lose its rust protection. Scientists are working on the idea of evenly distributed fluid-filled capsules into the electroplated layer. If the layer is damaged, the fluid runs out and 'fixes' the scratch.
Currently, researches with funding from Volkswagen Foundation have developed electroplated layers with nano-capsules. The problem with this approach is that smaller capsules are more sensitive and it will be difficult to electroplate due to its aggressive chemical/reactions.
There is still a lot of work to do before what we see in movies become reality i.e. regenerating humanoid robot.
Reference: www.sciencedaily.com
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