Fig. 3: Desirable properties and responses of the sensorized hydrogel.
From: Self-healing ionic gelatin/glycerol hydrogels for strain sensing applications
a Pressure, flexure, and strain sensitivities of the gelatin mixture at 1 kHz, both with and without added salt. b Hydrogel sensors are sensitive to environmental conditions. This can be used to estimate environmental factors and can be compensated using multiple sensors. c Self-healing: the recovered strains when a sample is cut in half and left at room temperature for 48 h, with no changes, with rehydration, and with thermal healing. d The recovery of a damaged strain sensor to a trapezoidal strain response in 1 h at room temperature. e Recovered strain 24 h after subjection to different pH values of buffer solution. f Material stability and sensitivity 6 months after extrusion.
