Switchable adhesion between hydrogels by wrinkling

On-demand adhere to and detach from soft wet surfaces are crucial for hydrogels applications in tissue engineering, machines, robotics. Whereas strong adhesion has been achieved between hydrogels, on-demand switching weak benign detachment is still under explorations. Herein, we report an approach switchable by invoking a mechanical process, wrinkling. The demonstrated bonding two hydrogel adherends with wrinkled adhesive, the formation characterizations of wrinkles tailored regulating prestretch adherend optimizing ingredients adhesive synergistically. On one hand, enhances creating tortuous path crack propagation extended energy dissipation zone. resulting robust elicit bulk within transform once failure cohesive failure. other suppression deactivates enhancement mechanism facilitate effortless debonding. As proof-of-concept, patch that can strongly damaged device repair gently after repairing, based on adhesion, demonstrated. proposed method expands design space adhesion.