Search Results (3)

The production of multipurpose sustainable fillers is a matter of great interest, and biochar can play a pivotal role. Biochar is a biomass-derived carbon source that can act as a versatile platform for the engineering of fillers as neat or functionalized materials. In this work, we investigate the utilization of 800 °C annealed Miscanthus-derived biochar as a filler for the production of epoxy composites with promising mechanical and electrical properties. We also used it in the production of an iron-rich hybrid filler in order to fine-tune the surface and bulk properties. Our main findings reveal that hybrid composites containing 20 wt.% biochar exhibit a 27% increase in Young’s modulus (YM), reaching 1.4 ± 0.1 GPa, while the ultimate tensile strength (UTS) peaks at 30.3 ± 1.8 Mpa with 10 wt.% filler, a 27% improvement over pure epoxy. However, higher filler loadings (20 wt.%) result in decreased UTS and maximum elongation. The optimal toughness of 0.58 ± 0.14 MJ/m³ is observed at 5 wt.% filler content. For organic composites, YM sees a notable increase of 90%, reaching 2.1 ± 0.1 Gpa at 20 wt.%, and UTS improves by 32% with the same filler content. Flexural tests indicate an enhanced elastic modulus but reduced maximum elongation as filler content rises. Electromagnetic evaluations show that hybrid fillers maintain a primarily dielectric behavior with a negligible impact on permittivity, while biochar–epoxy composites exhibit increased conductivity at higher filler loadings, suitable for high-frequency applications. In light of these results, biochar-based fillers demonstrate significant potential for enhancing the mechanical and electrical properties of epoxy composites. Full article

As biochar improves soil fertility and crop productivity, there is a growing interest in it as a resource for sustainable agriculture. Miscanthus sacchariflorus has promising applications in various industries because it has a large amount of biomass. However, research on the agricultural utilization of Miscanthus-derived biochar is insufficient. The aim of this study was to demonstrate the effects of Miscanthus biochar on the soil environment and soybean growth. First, Miscanthus biochar was amended at different levels (3 or 10 tons/ha) in upland soil, after which the soil properties, root development, and yield of soybeans were compared with the control (without biochar). In the soil amended with 10 tons/ha of biochar (BC10), organic matter (OM) and available phosphate increased 1.6 and 2.0 times, respectively, compared with that in the control soil (CON). In addition, the soil dehydrogenase activity increased by 70% in BC10, and 16S rRNA gene sequence analysis revealed that the structure of the microbial community changed after amendment with biochar. The bacterial phyla that differed between CON and BC10 were Acidobacteria and Chloroflexi, which are known to be involved in carbon cycling. Owing to these changes in soil properties, the root dry weight and number of nodules in soybeans increased by 23% and 27%, respectively, and the seed yield increased 1.5-fold in BC10. In conclusion, Miscanthus biochar increased the fertility of soybean-growing soil and consequently increased seed yield. This study is valuable for the practical application of biochar for sustainable agriculture. Full article

Production of versatile composites is a very attractive field. Carbon containing epoxy resins are one of the most relevant reinforced plastics used for a wide number of applications. In this research, we studied the influence of five different commercial biochar samples for the selective enhancement of brittleness and ductility of an epoxy based composite. We proved the relationship between biochar morphology and composites mechanical properties with the aid of FT-IR and FE-SEM analysis. We were able to improve the neat resin mechanical properties by doubling its Young’s modulus and ultimate tensile strength using a wheat straw derived material, and to increase its elongation by 40%, we used a Miscanthus derived biochar. Full article