Science Ahoy!

a legacy of our discomgoogolation

Posts Tagged ‘robotics

Slimy Propulsion

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First the gecko.  Now the snail.

`A UC San Diego engineer has revealed a new mode of propulsion based on how water snails create ripples of slime to crawl upside down beneath the surface. […]

Some freshwater and marine snails crawl by “hanging” from the water surface while secreting a trail of mucus. The snail’s foot wrinkles into little rippling waves, which produces corresponding waves in the mucus layer that it secretes between the foot and the air. […]

Anette Hosoi of the Massachusetts Institute of Technology, has already imitated the adhesive/ lubricating propulsive method of land snails to drive a robotic device.

Written by Elgie Shepard

October 11, 2008 at 11:57 am

Gecko Robots

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For some of us, nothing is more disgusting than watching a gecko climb a wall and go on to the ceiling and stay there without succumbing to effects of gravity.  For a few others, it is inspirational.

Adhesives that, like gecko feet, are dry, powerful, reusable, and self-cleaning could help robots climb walls or hold together electrical components, even in the harsh conditions of outer space. […]

Using a silicon substrate, he [Liming Dai, a professor of materials engineering at the University of Dayton] and his group grew arrays of vertically aligned carbon nanotubes topped with an unaligned layer of nanotubes, like rows of trees with branching tops. The adhesive force of these nanotube arrays is about 100 newtons per square centimeter–enough for a four-by-four-millimeter square of the material to hold up a 1,480-gram textbook. And its adhesive properties were the same when tested on very different surfaces, including glass plates, polymer films, and rough sandpaper.

So in future some of us are going to be paranoid about robots climbing walls too.

Written by Elgie Shepard

October 10, 2008 at 2:08 pm