OK
The Universal Selection Source:
Adhesives Ingredients
Industry News

Researchers Develop Double-sided Adhesive with Reversible Ability

Published on 2017-04-27. Author : SpecialChem

GECKO

Geckos are well known for effortlessly scrambling up walls and upside down across ceilings. Even in slippery rain forests, the lizards maintain their grip. Now scientists have created a double-sided adhesive that copies this reversible ability to stick and unstick to surfaces even in wet conditions. They say their development, reported in ACS’ Journal of Physical Chemistry C, could be useful in underwater robotics, sensors and other bionic devices.

Stick and Unstick in Wet Conditions


Inspired by geckos’ natural ability to attach and release their feet from surfaces as slick as glass, scientists have made a number of adhesives that can similarly stick and unstick with changes in temperature, light or magnetic field, but mostly in dry conditions. One promising approach to expanding this to underwater scenarios involves hydrogels that can swell and shrink in response to different acidity levels and other conditions. These volume differences change the gels’ friction and stickiness levels.


Scientists Mimic Gecko’s Feet


Synthetic two-sided gecko's foot could enable underwater robotics
Synthetic Two-sided Gecko's Foot Could Enable Underwater Robotics
Credit: ACS
Feng Zhou, Daniele Dini and colleagues recently developed a method to integrate nanostructured hydrogel fibers on an inorganic membrane. The material’s friction and stickiness levels changed with pH even when wet. The researchers wanted to further expand on this strategy to make the adhesive work on two sides.

The researchers first made the inorganic membrane double-faced and then added the hydrogel nanofibers on both sides. Testing showed that the material exhibited ultra-high friction and adhesion in an acidic liquid (pH of 2), and would rapidly switch to a state of ultra-low friction and stickiness when a basic solution (pH of 12) was added. Additionally, the two sides of the material can stick and slide independently of each other.

About American Chemical Society

The American Chemical Society is a nonprofit organization chartered by the U.S. Congress. With nearly 157,000 members, ACS is the world's largest scientific society and a global leader in providing access to chemistry-related research through its multiple databases, peer-reviewed journals and scientific conferences. ACS does not conduct research, but publishes and publicizes peer-reviewed scientific studies. Its main offices are in Washington, D.C., and Columbus, Ohio.

PS: If you liked this News, you might enjoy our Adhesives Industry Newsletter. All the Industry News delivered once a week right to your inbox. Sign up here!


Source: American Chemical Society
Improve your performance with water soluble epoxy compounds
Back to Top