An Electrically Conductive Oleogel Paste for Edible Electronics. (26th February 2022) - Cataldi, Pietro
Abstract: Edible electronics will facilitate point‐of‐care testing through safe devices digested/degraded in the body/environment after performing a specific function. This technology, to thrive, requires a library of materials that are the basic building blocks for eatable platforms. Edible electrical conductors fabricated with green methods and at a large scale and composed of food derivatives, ingestible in large amounts without risk for human health are needed. Here, conductive pastes made with materials with a high tolerable upper intake limit (≥ mg kg −1 body weight per day) are proposed. Conductive oleogel composites, made with biodegradable and food‐grade materials like natural waxes, oils, and activated carbon conductive fillers, are presented. The proposed pastes are compatible with manufacturing processes such as direct ink writing and thus are suitable for an industrial scale‐up. These conductors are built without using solvents and with tunable electromechanical features and adhesion depending on the composition. They have antibacterial and hydrophobic properties so that they can be used in contact with food preventing contamination and preserving its organoleptic properties. As a proof‐of‐principle application, the edible conductive pastes are demonstrated to be effective edible contacts for food impedance analysis, to be integrated, for example, in smart fruit labels for ripening monitoring. Abstract : Edible electronics need food‐grade materials with specific electronic features to revolutionize food quality monitoring and medicine. Edible electrical conductive pastes made of waxes, oils, and conductive carbon fillers are obtained through green and large‐scale manufacturing. The electrodes are eatable in large amounts, conformable, and adhesive, and as such, could be employed in sectors such as the food industry and pharmacology.