TY  - JOUR
U1  - Wissenschaftlicher Artikel
A1  - Schulte, Sarina
A1  - Lübkemann‐Warwas, Franziska
A1  - Kroll, Stephen
A1  - Siebert‐Raths, Andrea
T1  - Novel olive stone biochar particle network for piezoresistive strain sensing in natural fiber‐reinforced composites
JF  - Polymer Composites
N2  - 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
KW  - biochar
KW  - carbon black
KW  - flax
KW  - natural fiber-reinforced composite
KW  - piezoresistive sensor
KW  - Pflanzenkohle
KW  - Industrieruß
KW  - Flachs
KW  - Halbleiterdrucksensor
Y1  - 2024
UN  - https://nbn-resolving.org/urn:nbn:de:bsz:960-opus4-32747
SN  - 0272-8397
SS  - 0272-8397
U6  - https://doi.org/10.25968/opus-3274
DO  - https://doi.org/10.25968/opus-3274
VL  - 45
IS  - 6
SP  - 5737
EP  - 5753
S1  - 17
PB  - Wiley
ER  -