Figure 83.

Mechanical properties of protein-MOFs and ferritin-PIX. a) fdh-Ni-ferritin lattice unit cell with a close-up view of the interfacial connectivity (left). Thermal hysteresis loop (middle) and reversible cycling (right) of the fdh-Ni-ferritin lattice expansion/contraction. b) Schematic representation (top) and light micrographs (middle) showing the formation, expansion and contraction of ferritin-PIX. Light micrographs of ferritin-PIX (bottom) showing the self-healing behavior of cracks that appear during Ca-induced contraction. c) Schematic representation of the reversible anisotropic expansion/contraction of rhombohedral ^raft−ferritin-PIX (top). Light micrographs of the rhombohedral ^raft−ferritin-PIX crystal showing cation-induced bending motion (middle) and self-healing behavior (bottom). (a) Adapted with permission from Ref.⁵¹³. Copyright 2020 ACS. (b) Adapted with permission from Ref.²⁹⁵. Copyright 2018 NPG. (c) Adapted with permission from Ref.⁵⁷³. Copyright 2021 ACS.