Fig. 1: Highly linear and stretchable strain sensors with ionic gelatin-glycerol hydrogels.
From: Self-healing ionic gelatin/glycerol hydrogels for strain sensing applications
a The structure of the gelatin hydrogel, in which glycerol acts as a plasticizer and increases the bound-water content. b The gelatin/glycerol/citric acid hydrogel undergoing strains of >400%. c Hydrogel’s highly linear resistive response under 300% applied strain. d The strain sensitivity is much higher than the pressure sensitivity: here, the response of a sample to 32.8 kPa is negligible compared to that during 10% applied strain, making it ideal for strain sensing applications.
