With the continuous advancement of the 'double carbon' goal and the concept of green manufacturing, high-performance materials with renewable sources and designable properties are becoming an important development direction for materials science and industrial applications. As a high-end form of cellulose materials, nanocellulose (Nanocellulose), with its unique nanostructure and excellent physical and chemical properties, is showing broad application potential in functional materials, daily chemicals, coatings, composite materials, biomedicine and other fields. 1. What is nanocellulose? Nanocellulose is a nanoscale fiber material obtained by dissociating natural cellulose through mechanical, chemical or biological methods. It usually includes cellulose nanofibers (CNF), cellulose nanocrystals (CNC) and bacterial cellulose (BC). Its diameter is generally 5–50 nm, its length can reach hundreds of nanometers to several micrometers, and it has a typical high aspect ratio and three-dimensional network structure. After the scale enters the nanoscale, fiber

Nanocellulose: the technical value and application prospects of a new generation of high-performance bio-based functional materials. With the continuous advancement of the 'double carbon' goal and the concept of green manufacturing, high-performance materials with renewable sources and designable performance are becoming an important development direction in materials science and industrial applications. As a high-end form of cellulose materials, nanocellulose (Nanocellulose), with its unique nanostructure and excellent physical and chemical properties, is showing broad application potential in functional materials, daily chemicals, coatings, composite materials, biomedicine and other fields. 1. What is nanocellulose? Nanocellulose is a nanoscale fiber material obtained by dissociating natural cellulose through mechanical, chemical or biological methods. It usually includes cellulose nanofibers (CNF), cellulose nanocrystals (CNC) and bacterial cellulose (BC). Its diameter is generally 5–50 nm, and its length can range from hundreds of nanometers to several micrometers.

With the rapid development of green materials and sustainable technologies, nanocellulose has gradually become an important research and application target in the field of functional materials due to its advantages such as wide sources, renewable nature, and good biocompatibility. Among them, carboxylated nanocellulose (Carboxylated Nanocellulose) has significantly expanded the dispersion, reactivity and application boundaries of nanocellulose by introducing carboxyl functional groups on the surface of cellulose molecules, and has become one of the key directions of current industrialization and scientific research. 1. Structural characteristics of carboxylated nanocellulose Carboxylated nanocellulose usually introduces a -COOH group on the C6 hydroxyl group of the cellulose molecular chain through chemical modification. This structural change makes the surface of nanocellulose carry a stable negative charge, which can form a strong electrostatic repulsion in a water system, thereby building a more uniform and stable nanofiber network structure. with unmodified nanocellulose