Self-healing hydrogel electrodes from ingestible materials

Abstract

Mechanically robust self-healing conducting hydrogel offer new possibilities to further the state of the art of ingestible (edible) device research. Here, we report self-healing hydrogel electrodes based on readily available ingestible materials sourced from supermarkets. We used an interpenetrating polymer network hydrogel consisting of sodium tetraborate-crosslinked poly(vinyl acetate) and food-grade gelatin that exhibited synergistic strengthening enabling it to withstand the stresses similar to those experienced in the gastrointestinal tract. The edible gels achieved full self-healing within 1 min (electrical conductivity 8.8 ± 0.8 mS/cm) and 1 h (tensile strength 60 ± 5 kPa), respectively, of reconnection of two severed halves.

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On behalf of all authors, the corresponding author states that data will be made available upon request.

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Acknowledgments

This study was supported by the University of Wollongong and Australian Research Council Centre of Excellence for Electromaterials Science.

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Correspondence to Marc in het Panhuis.

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Keller, A., Warren, H. & Panhuis, M.i.h. Self-healing hydrogel electrodes from ingestible materials. MRS Communications (2021). https://doi.org/10.1557/s43579-021-00024-0

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Keywords

  • Composite
  • Elastic properties
  • Electrical properties
  • Polymer
  • Sol–gel