Maqola

Sustainable Lightweight Biochar-Based Composites with Electromagnetic Shielding Properties

Filipe NatálioDepartment of Plant & Environmental Sciences, Weizmann Institute of Science, Rehovot 7610001, IsraelTomás P. CorralesDepartamento de Física, Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, ChileYishay FeldmanChemical Services Unit, Weizmann Institute of Science, Rehovot 7610001, IsraelBeni LewInstitute of Agricultural Engineering, The Volcani Center, Agricultural Research Organization, P.O. Box 15159, Rishon LeTzion 7528809, IsraelEllen R. GräberInstitute of Soil, Water and Environmental Sciences, The Volcani Center, Agricultural Research Organization, P.O. Box 15159, Rishon LeTzion 7528809, Israel

2020en

ABI

Annotatsiya

). Biochar is a derivative of biomass pyrolysis and a carbon sink mainly used to improve crop production. This work explores the underlying mechanism behind biochar's electric conductivity using a wide range of feedstocks and its combination with a binder (gypsum). This gypsum-biochar composite exhibits decreased density and flexural moduli with increasing biochar content, particularly after 20% w/w. Gypsum-biochar drywall-like composite prototypes display increasing shielding efficiency mostly in the microwave range as a function of biochar content, differing from other conventional metal (copper) and synthetic carbon-based materials. This narrow range of electromagnetic interference (EMI) shielding is attributed to natural alignment (isotropy) of the carbon ultrastructure (e.g., lignin) induced by heat and intrinsic interconnectivity in addition to traditional phenomena such as dissipation of surface currents and polarization in the electric field. These biomass-derived products could be used as sustainable lightweight materials in a future bio-based economy.

Hali tarjima qilinmagan

Identifikatorlar

DOI: 10.1021/acsomega.0c04639

Iqtiboslar va manbalar

2 ta iqtibos0 ta foydalanilgan manba

Koʻrsatkichlar — AkademScholar