Novel olive stone biochar particle network for piezoresistive strain sensing in natural fiber-reinforced composites

authored by

Sarina Schulte, Franziska Lübkemann-Warwas, Stephen Kroll, Andrea Siebert-Raths

Abstract

Natural fiber-reinforced composites (NFRCs) suffer from water absorption and low temperature stability, resulting in fiber degradation and subsequent material failure. Built-in piezoresistive sensors are investigated to monitor the deformation/strain of the component. As a low-cost material from renewable resources biochar particles derived from olive stones were applied on flax plies and yarn bundles that served as model systems. Carbon black samples as petrochemical variants were used as a reference material. Biochar and carbon black-covered fiber systems were laminated in epoxy resin followed by tensile tests. The electrical resistance was recorded simultaneously during testing. Biochar with a broad size distribution from nano to high micrometer range (D < 200 μm) was superior in sensor performance compared to carbon black and biochar with a smaller particle size range D < 20 μm. Gauge factors (GF) of NFRC samples with integrated biochar particles reached 30–80 while carbon black could not exceed a GF of 8. To obtain maximum GFs, yarn count of flax yarn/ply substrate should be as thin as possible, but still enable percolation of the adhering particle network. Comparatively large particle size was identified as a contributing factor enabling the high GF for coarse biochar compared to carbon black. Highlights: A nonfossil biochar built-in piezoresistive sensor in natural fiber-reinforced composites was fabricated Deposing biochar directly on flax fibers facilitates processing The biochar piezoresistive sensor exhibits superior sensitivity compared to carbon black.

Organisation(s)

Institute of Physical Chemistry and Electrochemistry

External Organisation(s)

University of Applied Sciences and Arts Hannover (HsH)

Type

Article

Journal

Polymer composites

Volume

45

Pages

5737-5753

No. of pages

17

ISSN

0272-8397

Publication date

12.04.2024

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Ceramics and Composites, Chemistry(all), Polymers and Plastics, Materials Chemistry

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

Electronic version(s)

https://doi.org/10.1002/pc.28160 (Access: Closed)