Strain and Pressure Gauges from Tough, Conducting and Edible Hydrogels


The development of highly conductive, robust edible hydrogels was investigated using a combination of the biopolymers gellan gum and gelatin, a common salt (NaCl) and plant-derived cross-linker (genipin). Robust strain gauge/pressure sensors were developed using edible materials to demonstrate the potential of these hydrogels. The hydrogels exhibited gauge factor and pressure sensitivity values of 7.6 ± 0.1 and 400 ± 7 μΩ/Pa for loads up to 3 kPa, respectively. Furthermore, these devices were able to operate under larger loads with gauge factor and pressure sensitivity values of 0.308 ± 0.002 and 7.17 ± 0.05 μΩ/Pa, respectively, for loads between 9 kPa and 280 kPa.


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Keller, A., Benz, D. & in het Panhuis, M. Strain and Pressure Gauges from Tough, Conducting and Edible Hydrogels. MRS Online Proceedings Library 1795, 27–33 (2015).

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