1. What is bacterial cellulose? Bacterial Cellulose (BC) is a natural polymer material synthesized by microbial fermentation. Compared with plant-derived cellulose, it does not contain lignin and hemicellulose, has higher purity, and has a nanoscale three-dimensional network structure, high crystallinity and excellent mechanical properties. With these properties, bacterial cellulose has become one of the important research hotspots in the field of biomedical materials in recent years. 2. The core advantages of bacterial cellulose in medical dressings 1. It has both high water retention and breathability. The moisture content of bacterial cellulose can be as high as 99%, which can form a stable moist environment on the wound surface and has good gas exchange capabilities, which is helpful to accelerate wound healing. Keywords: Moist healing, medical dressing materials, bacterial cellulose moisturizing properties 2. Excellent biocompatibility, its source is natural, its structure is pure, it is non-toxic and non-irritating to the human body, and it can effectively reduce inflammatory reactions

With the continuous development of green materials and functional materials technology, structural color (Structural Color) has gradually become an important direction in the research of new generation optical materials. Different from traditional coloring methods that rely on chemical pigments or dyes, structural color is a color formed by the reflection, diffraction and interference of light by the micro-nanostructure inside the material. Therefore, it has the advantages of environmental protection, stability and controllability. In recent years, the natural bio-based material **Nanocellulose** has shown great application potential in the field of structural color materials due to its unique nanostructure and excellent self-assembly properties. 1. Basic principles of structural color Structural color is an optical phenomenon produced by the microstructure of materials. Its color comes from the interaction between light and periodic structures, rather than the color produced by the absorption spectrum of chemical pigments. Many creatures in nature use structural colors to create bright visual effects, such as butterfly wings

1. What is a thixotropic modifier? In industrial systems such as coatings, daily chemicals, pesticide suspensions, inks, and composite materials, thixotropic modifiers (Thixotropic Rheology Modifier) ​​are an important functional additive used to regulate the rheological properties of the system. Its main function is to adjust the viscosity of the system, prevent solid particles from settling, improve system stability, and improve construction or use performance. An ideal thixotropic system usually exhibits: high viscosity in a static state, reduced viscosity when subjected to shear, and rapid recovery of structure after shearing is stopped. This structural recovery ability directly determines the stability and user experience of the product. In recent years, with the increasing demand for green materials and sustainable development, nanocellulose (Nanocellulose) has gradually become a new high-performance thixotropic regulating material. 2. Structural advantages of nanocellulose Nanocellulose is prepared from natural cellulose through mechanical, chemical or biological methods.