Red Orbit, 30 August 2013
http://www.redorbit.com/news/technology/1112936028/newest-idea-for-nanosat-micro-rockets-083013/
To get around the problem, King and his team have developed an elegant strategy: eliminate the expensive and tedious microfabrication required to make the needles by letting Mother Nature take care of the assembly. “We’re working with a unique type of liquid called a ferrofluid that naturally forms a stationary pattern of sharp tips in the liquid surface,” he says. “Each tip in this self-assembling structure can spray a jet of fluid just like a micro-needle, so we don’t actually have to make any needles.”
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