Mechanically Tunable Adhesive via Strain-Induced Surface Wrinkles

The patent applies the dynamics principle by creating an adhesive system where the surface topology can be dynamically changed through mechanical strain. The wrinkle patterns on the adhesive surface can be transformed from a flat state to a rippled state by applying strain, allowing the same adhesive material to adapt its adhesion properties for different applications. This dynamic transformation enables the adhesive to switch between high adhesion (flat state) and low adhesion (rippled state) as needed.

The patent applies parameter changes by modifying the physical state of the adhesive surface through mechanical strain. By changing the strain level applied to the adhesive, the surface morphology parameters (wrinkle amplitude, wavelength, and coverage) are altered, which directly changes the adhesion properties. This allows continuous tuning of adhesion strength without changing the material composition.

The patent applies the self-service principle by utilizing the adhesive material's own mechanical properties to generate the wrinkle patterns. The wrinkles are formed through internal buckling forces that arise when a thin rigid coating is applied over a pre-strained soft substrate. The system uses its own elastic energy storage and release to create the surface topology without requiring external tools or complex fabrication processes.

The patent replaces complex mechanical surface patterning systems with a simpler chemical-coating approach. Instead of using mechanical tools to create wrinkles, the invention uses a thin coating layer (such as metal or oxide) deposited on a pre-strained substrate. The wrinkle formation is achieved through the mechanical relaxation of the pre-strained state combined with the coating application, substituting complex mechanical patterning with a more straightforward coating process.