Through mimicking nature we have made great technical strides. To the ones described above add another.
As reported in the journal, Smart Materials and Structures, Virginia Tech’s is Alex Villanueva has developed a robotic device that uses the propulsion and rowing actions of a jellyfish. His creation is Robojelly seen in the picture below.
Robojelly has one other characteristic that has significance for other types of robot designs, the ability to derive the energy to drive it from the surrounding environment. It does this using a platinum-based surface which catalyzes the hydrogen in seawater to create an exothermic reaction. The heat from the exothermic reaction makes Robojelly’s artificial muscles, called actuators, contract the bell-shaped dome expelling water to propel it forward.
The actuators are composed of nickel-titanium shape-memory alloy and sheets of carbon nanotubes coated with platinum powder. The material has been given the name BISMAC standing for Bio-Inspired Shape Memory Alloy Composites. The byproduct of the hydrogen reaction is water vapour.
Robojelly can run indefinitely deriving all the energy it needs from the seawater that surrounds it. Add a packet of sensors and it becomes a surveillance and telemetry tool that can measure and study the ocean without ever having to stop for fuel. To view Robojelly in action click here.
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