College of Wood Science and Technology, Nanjing Forestry University, Nanjing 210037, PR China.
Bioresour Technol. 2010 Apr;101(8):2867-71. doi: 10.1016/j.biortech.2009.10.074. Epub 2009 Dec 1.
Agricultural biomaterials such as crop stalks are natural sources of cellulosic fiber and have great potential as reinforced materials in bio-composites. In order to evaluate their potential as materials for reinforcement, the nano-mechanical properties of crop-stalk cell walls, i.e. those of cotton (Gossypium herbaceu) stalk, soybean (Glycine max) stalk, cassava (Manihot esculent) stalk, rice (Oryza sativa L.) straw, and wheat (Triticum aestivum L.) straw, were investigated by means of nano-indentation and atomic force microscopy (AFM). The elastic modulus of wheat straw was found to be 20.8 GPa, which was higher than that of the other four crops. The highest hardness was observed in cotton stalk at 0.85 GPa. The elastic moduli of the crop stalks were lower than those of most of the hardwood species, but higher than that of some softwoods and of lyocell fiber. The mean value of the hardness of the five crop stalks' cell walls was higher than those of wood or lyocell fiber.
农业生物材料，如农作物秸秆，是纤维素纤维的天然来源，在生物复合材料中作为增强材料具有巨大的潜力。为了评估其作为增强材料的潜力，通过纳米压痕和原子力显微镜（AFM）对作物秸秆细胞壁的纳米力学性能进行了研究，即棉花（Gossypium herbaceu）秸秆、大豆（Glycine max）秸秆、木薯（Manihot esculent）秸秆、水稻（Oryza sativa L.）秸秆和小麦（Triticum aestivum L.）秸秆的纳米力学性能。发现小麦秸秆的弹性模量为 20.8 GPa，高于其他四种作物。棉花秸秆的硬度最高，为 0.85 GPa。作物秸秆的弹性模量低于大多数硬木种类，但高于一些软木和莱赛尔纤维。五种作物秸秆细胞壁硬度的平均值高于木材或莱赛尔纤维。
