Bioengineered Hydrogel Implies New Functionality for Soft Robotics
This gel reacts to light with faster response rates and improved control
By RoboticsTrends' News Sources - Filed May 30, 2013

DARPA and Harvard's "octopus robot" is another bio-inspired soft robotics project that could one day be used for spy operations.

Inspired by the way plants grow toward light sources, a phenomenon known as phototropism, bioengineers from the University of California, Berkeley have created a hydrogel that could be manipulated by light.

The new hydrogel, described earlier this month in the journal Nano Letters, could have future applications in the emerging field of soft robotics, which takes a cue from squishy creatures in nature, like starfish, squids and octopuses, to create flexible components.

"Shape-changing gels such as ours could have applications for drug delivery and tissue engineering," said study principal investigator Seung-Wuk Lee, associated professor of bioengineering.

Researchers combined synthetic, elastic proteins with sheets of graphene, one-atom thick carbon sheets that stack to form graphite. Graphite is the same material used in pencil lead. The graphene sheets generate heat when exposed to near infrared light. That heat affects the , which absorb water when cooled and release it when hot.

The two materials together formed the nanocomposite , or hydrogel, which was designed so that one side was more porous than the other. The side that was more porous allowed a faster absorption and release of water than the other side.

"By combining these materials, we were able to mimic the way plant cells expand and shrink in response to light in a much more precisely controlled manner," said Lee. "Because the gels shrank unevenly, the material bent when the light hit it. We used these bending motions to demonstrate a hand-shaped  that exhibited joint-like articulation when exposed to light."

This video from UC Berkeley demonstrates how the new hydrogel material, shaped as a hand, can be controlled by laser light.

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