Underwater sticky device inspired by octopus

Researchers develop new sticky device that can attract and release underwater objects with incredible precision, Interesting Engineering reported on October 10. New research published in the journal Advanced Science.

“I’m fascinated by the way octopuses hold on to an object for a moment, then immediately release it. They do this underwater, with things that are rough, curved, and irregular – it’s impressive,” Michael Bartlett, an expert at Virginia Polytechnic University and leader of the research team, said.

Scientists observe the outermost part of the octopus’s sucker called the funnel. These suction cups are like stretchy hands that can grasp anything. They are made of living tissue and can adjust their shape and strength to suit each object. This means they can hold onto objects of different textures and shapes.

In the new study, the team of experts developed a multi-surface adhesive device with a curved, elastic body and a deformable membrane. The device sticks to rough, curved, and irregular surfaces in various liquid environments with impressive strength.

“When activated, the octopus-inspired sticky device is 1,000 times stronger than when in a relaxed state. Importantly, this transition happens in just a fraction of a second, about 30 milliseconds “, the research team said.

According to the team of scientists, the device demonstrated reliable adhesion over multiple uses and over long periods of time. In testing, it maintained its strength through 100 cycles, even holding a rough rock underwater for more than seven days and then releasing it on command. This durability is especially important in situations where an object needs to be kept underwater for long periods of time, such as when workers are retrieving a sunken object.

Previously, Professor Bartlett developed Octa-Glove, a sticky glove inspired by octopus. The gloves are equipped with a LIDAR sensor to detect and gently stick to underwater objects. Potential applications of the Octa-Glove include rescue diving, underwater archaeology, consumer assistance technologies, and healthcare. “We hope to be able to use the new adhesive device to further improve the Octa-Glove,” shared Bartlett.