Cellulose nanocrystals (CNCs) is one of the interesting materials attracting many researchers from the decades, especially when they are extracted from natural biomass resources. This study focuses on the isolation of CNCs with high crystallinity from Vietnamese agricultural wastes (Nypa Fruticans trunk, coconut husk fiber, and rice husk). CNCs were extracted from the above natural sources by a three-step process including formic/peroxyformic acid pre-treatment, hydrogen peroxide/sodium hydroxide treatment, and a hydrolysis disintegration process. The structure and thermal property of obtained materials after each stage of treatments were characterized by XRD, TGA, TEM, and FT-IR analysis. TEM observation has showed the CNCs with high aspect ratio in shape of 200–500 nm in length and 10–15 nm in width. FT-IR results indicated that lignin was completely removed from the samples during chemical treatment. The high crystalline index (nearly 80%) and improved thermal stability of the CNCs nanofibers indicate its various potential applications.

纤维素纳米晶体（CNC）是数十年来吸引许多研究人员的有趣材料之一，尤其是从天然生物质资源中提取时。这项研究的重点是从越南农业废弃物中分离出具有高结晶度的CNCs（Nypa Fruticans树干，椰子壳纤维和稻壳）。通过三步过程从上述天然资源中提取CNC化合物，包括甲酸/过氧甲酸预处理，过氧化氢/氢氧化钠处理和水解崩解过程。通过XRD，TGA，TEM和FT-IR分析对每个处理阶段后获得的材料的结构和热性能进行了表征。TEM观察显示，CNS具有长宽比为200-500 nm，宽度为10-15 nm的高纵横比。FT-IR结果表明，在化学处理过程中，木质素已从样品中完全去除。CNCs纳米纤维的高结晶指数（接近80％）和更高的热稳定性表明了其各种潜在的应用。