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(A) Illustration of the nano-crosslinked hydrogels by dynamic borate ester bond formation. (B) dependence of moduli on strain amplitude sweep (γ = 0.1–400%) at a fixed frequency of 1 rad/s; (C) step-strain test at a fixed frequency of 1 rad/s (1% or 400% of strain); (D) viscosity measurement at 1% of strain; (E) printed cone and hollow cylinder 3D patterns. Reproduced with permission [60]. Copyright 2019, American Chemical Society.
