Coco stretch: strain sensors based on natural coconut oil and carbon black filled elastomers

Lugoda, Pasindu, Costa, Júlio C, Garcia-Garcia, Leonardo A, Pouryazdan, Arash, Jocys, Zygimantas, Spina, Filippo, Salvage, Jonathan, Roggen, Daniel and Munzenrieder, Niko (2021) Coco stretch: strain sensors based on natural coconut oil and carbon black filled elastomers. Advanced Materials Technologies, 6 (2). 2000780 1-9. ISSN 2365-709X

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Abstract

A biocompatible inexpensive strain sensor constituting of an elastomer filled with natural coconut oil (CNO) and carbon black (CB) is presented here. Strain sensors are widely utilized for applications in human activity recognition, health monitoring, and soft robotics. Given that these sensors are envisioned to be present in a plethora of fields, it is important that they are low cost, reliable, biocompatible, and eco-friendly. This work demonstrates that CNO can be used to create conductive percolation network in elastomers, without the necessity for harmful chemicals or expensive machinery. The sensor has a gauge factor of 0.77 ± 0.01, and the sensing material has a porous morphology filled with an oily suspension formed of CNO and CB. Results indicate that the liquid filled porous structure can improve the reliability of these resistive strain sensors in comparison to sensors fabricated utilizing commonly used non-polar solvents such as heptane. Consequently, the sensor demonstrates a hysteresis of only 2.41% at 200% strain over 250 stretch/release cycles. Finally, to demonstrate the potential of this fabrication technique, a functionalized glove is developed and used to detect wrist motion. These easily manufacturable and cost-effective sensors enable wearable on-skin ergonomic intervention systems with minimal impact on the environment.

Item Type: Article
Keywords: carbon black, cocos nucifera oil, eco&#8208, friendly sensors, strain sensors, wearable devices
Schools and Departments: School of Engineering and Informatics > Engineering and Design
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 06 Aug 2021 07:50
Last Modified: 23 Aug 2021 15:15
URI: http://sro.sussex.ac.uk/id/eprint/100953

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