TY - JOUR

T1 - Novel olive stone biochar particle network for piezoresistive strain sensing in natural fiber-reinforced composites

AU - Schulte, Sarina

AU - Lübkemann-Warwas, Franziska

AU - Kroll, Stephen

AU - Siebert-Raths, Andrea

N1 - Funding Information: Sarina Schulte would like to thank the Hannover School for Nanotechnology for funding.

PY - 2024/4/12

Y1 - 2024/4/12

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.

AB - 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

UR - http://www.scopus.com/inward/record.url?scp=85184698556&partnerID=8YFLogxK

U2 - 10.1002/pc.28160

DO - 10.1002/pc.28160

M3 - Article

AN - SCOPUS:85184698556

VL - 45

SP - 5737

EP - 5753

JO - Polymer composites

JF - Polymer composites

SN - 0272-8397

IS - 6

ER -