Oscillating gel acts like artificial skin, giving robots potential ability to 'feel'

March 29, 2012
Image credit: Irene Chou Chen

Sooner than later, robots may have the ability to "feel." In a paper published online March 26 in Advanced Functional Materials, a team of researchers from the University of Pittsburgh and the Massachusetts Institute of Technology (MIT) demonstrated that a nonoscillating gel can be resuscitated in a fashion similar to a medical cardiopulmonary resuscitation. These findings pave the way for the development of a wide range of new applications that sense mechanical stimuli and respond chemically—a natural phenomenon few materials have been able to mimic.

A team of researchers at Pitt made predictions regarding the behavior of Belousov-Zhabotinsky (BZ) gel, a material that was first fabricated in the late 1990s and shown to pulsate in the absence of any external stimuli. In fact, under certain conditions, the gel sitting in a petri dish resembles a beating heart.

Along with her colleagues, Anna Balazs, Distinguished Professor of Chemical and Petroleum Engineering in Pitt's Swanson School of Engineering, predicted that BZ gel not previously oscillating could be re-excited by mechanical pressure. The prediction was actualized by MIT researchers, who proved that chemical oscillations can be triggered by mechanically compressing the BZ gel beyond a critical stress.

"Think of it like human skin, which can provide signals to the brain that something on the body is deformed or hurt," says Balazs. "This gel has numerous far-reaching applications, such as artificial skin that could be sensory—a holy grail in robotics."

Balazs says the gel could serve as a small-scale pressure sensor for different vehicles or instruments to see whether they'd been bumped, providing diagnostics for the impact on surfaces. This sort of development—and materials like BZ —are things Balazs has been interested in since childhood.

"My mother would often tease me when I was young, saying I was like a mimosa plant— shy and bashful," says Balazs. "As a result, I became fascinated with the plant and its unique hide-and-seek qualities—the plant leaves fold inward and droop when touched or shaken, reopening just minutes later. I knew there had to be a scientific application regarding touch, which led me to studies like this in mechanical and chemical energy."

Also on Balazs's research team were Olga Kuksenok, research associate professor, and Victor Yashin, visiting research assistant professor, both in Pitt's Swanson School of Engineering. At MIT, the work was performed by Krystyn Van Vliet, Paul M. Cook Career Development Associate Professor of Material Sciences and Engineering, and graduate student Irene Chen.

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2.3 / 5 (3) Mar 29, 2012
The more I see stuff like this the more I think humans were created in a lab.
1 / 5 (3) Mar 30, 2012
This is just the beginning. If biologists can get to the point of questioning their textbooks, and revisit some fundamental cell biology, we could see a revolution in human-computer interface in short order. It's time to abandon the failed pumps-and-channels hypothesis, for gels *naturally* create ionic gradients, with zero energy input. This is Mother Nature's big secret which Gerald Pollack and Ling have helped us to see. The only thing standing in the way of us and this crazy new future is the dogma of pumps-and-channels theory.


Polywater was not the end of the story. Water does indeed structure around proteins. This is what the MRI was created to observe.
5 / 5 (1) Mar 30, 2012
..aaaand the Japanese invent something kinky in 3-2-1...

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