Fig. 2: Fabrication and material selection.
From: Self-healing ionic gelatin/glycerol hydrogels for strain sensing applications
a Simple fabrication process of the hydrogel in a water bath at 50 °C. b Dual-nozzle 3D printing setup showing printing of a multilayer pyramid and three custom strain sensor morphologies. c The effect of the four sensorization additives on the hydrogel’s baseline resistance. d Various compositions reaching environmental equilibrium in the hours immediately following printing. e, f Low-humidity and high-humidity stress–strain responses of the hydrogel over a 1 week time period. e Tests the Ge/Gl/H2O/CA composition, while f tests the 1/50 NaCl mix after 7 days.
