Reusable Adhesive that Works Underwater
Illinois researchers have introduced a new cutting-edge reusable adhesive that activates in seconds, works underwater, and is strong enough to deadlift 11 pounds: shape memory polymers (SMPs). The teamAssociate Professor in Mechanical Science and Engineering Seok Kim, graduate student Jun Kyu Park, and former graduate student Jeffrey D. Eisenhaure (PhD ME 17, now with Northrop Grumman)has proved that SMPs can retain dry adhesion properties while submerged. Their study, Reversible underwater dry adhesion of a shape memory polymer, was recently published by the scientific journal Advanced Materials Interfaces (Wiley-VCH).
Classified as a smart material, SMPs have the ability to manually transition between their original state and a deformed state. By manipulating the state of their SMPs, Kim and his team achieved successful adhesion to surfaces submerged in water as well as other liquid media such as oil.
Dry adhesives, such as those inspired by gecko feet, are believed to be inadequate to achieve high adhesion to a wet or submerged surface, Kim said. However, this belief has been nullified because of our SMP reversible dry adhesives.
By applying pressure to the submerged SMP in its original rubbery state, liquid can be squeezed out from the contact interface. Under sufficient pressure, the SMP then transitions to a glassy state, essentially creating a hermetic contact condition that maintains highly strong dry adhesion. However, this state is not permanent; the ....