Fig. 4
From: Recent advances in 3D printable conductive hydrogel inks for neural engineering
Schematic diagram of different physicochemical properties of conductive hydrogel: (top left) biocompatibility, (top right) degradability of polymer chains, (bottom left) mechanical stiffness of matrix for swelling design, and (bottom right) adhesion from chemical bonds and physical interactions: (i) electrostatic interactions, (ii) polymer chain entanglement, and (iii) mechanical interlocking