Phase Change Hydrogels for Bio‐Inspired Adhesion and Energy Exchange Applications

Abstract The adhesion strategies of the gecko's toe through surface adaptation spatulas to increase contact area and snail's epiphragm via dehydration‐induced solidification lock interfaces are combined design a class adhesion‐switchable hydrogels. hydrogels made incorporating CH 3 COONa·3H 2 O salt (SA) into polyacrylamide (PAM) aqueous networks construct supersaturated stimuli‐responsive phase change materials (PAM‐SA). crystallization dramatically strengthens mechanical properties, tensile Young's moduli 340.7 0.1 MPa for crystalline C‐PAM‐SA‐120% soft PAM hydrogel. As result, PAM‐SA‐120% shows excellent adhesive performance (adhesion strength, 348 kPa) compared with hydrogel 7 kPa). stimuli‐induced from H‐PAM‐SA‐120% releases thermal controllably, which can be utilized thermochromic thermotherapy.