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3D Printed Edible Hydrogel Electrodes

Published online by Cambridge University Press:  11 December 2015

Alex Keller
Affiliation:
Soft Materials Group, School of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia.
Leo Stevens
Affiliation:
Intelligent Polymer Research Institute, ARC Centre of Excellence for Electromaterials Science, AIIM Facility, University of Wollongong, Wollongong, NSW 2522, Australia.
Gordon G. Wallace
Affiliation:
Intelligent Polymer Research Institute, ARC Centre of Excellence for Electromaterials Science, AIIM Facility, University of Wollongong, Wollongong, NSW 2522, Australia.
Marc in het Panhuis
Affiliation:
Soft Materials Group, School of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia. Intelligent Polymer Research Institute, ARC Centre of Excellence for Electromaterials Science, AIIM Facility, University of Wollongong, Wollongong, NSW 2522, Australia.
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Abstract

We report on a hand-held reactive printing device used to pattern highly conductive, edible hydrogel wires formed from gellan gum, gelatin, cross-linkers and a common salt (NaCl). The conductivity of the gels when printed (190 ± 20 mS/cm) closely matched the conductivity recorded for cast systems (200 ± 19 mS/cm). Printing was observed to reduce the elastic modulus and failure strains of hydrogels under compression, but printed gels retained sufficient integrity for application as flexible conductive lines. We demonstrate that hand-held printing can utilize to pattern soft conductor elements within a simple electronic circuit.

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Copyright © Materials Research Society 2015 

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