fig7

Figure 7. Adhesion tests of hydrogels. (A) Peeling tests of hydrogels [various lignosulfonate (LS) contents] adhering to pigskin^[65]. (B) Adhesion strength of hydrogels (various LS contents) adhering to pigskin^[65]. (C) Schematic diagram of hydrogel adhesion to wood, glass, plastic, and stainless steel spoons^[65]. (D) Adhesion of the hydrogel to pig skin. Hydrogels adhered to pig skin tissues under bending (i) and torsion (ii). (iii) Two pig skins connected by hydrogel^[66]. (A-C) Reproduced with permission^[65]. Copyright 2022, Elsevier. (D) Reproduced with permission^[66]. Copyright 2020, ACS.