Fig. 4. Mechanical properties of the self-assembled SPI film.

a Representative stress–strain curves for the dried nonstructured and the dried self-assembled films. b Mechanical properties of self-assembled SPI film in comparison to previously reported biomaterials, engineered materials^6,71,72, and plant-based materials (see Supplementary Table 2 for references). c Zoomed-in graph for self-assembled (orange), nonstructured (blue), and previously reported SPI films (green, the details of references are in Supplementary Table 3).