1. Introduction to bacterial cellulose Bacterial cellulose (BC) is a natural polymer material synthesized by specific strains (such as Komagataeibacter xylinus) during the fermentation process. Compared with plant cellulose, it has a more uniform structure and higher purity, and is free of lignin and hemicellulose, so it exhibits many unique physical and chemical properties. Among them, high water content is one of the most significant advantages of bacterial cellulose and is also a key factor that promotes its entry into medical health, beauty and skin care, food packaging and other industries. 2. Why is bacterial cellulose ultra-high water content? The moisture content of bacterial cellulose can usually reach 90% to 99%, far exceeding that of plant cellulose products. This characteristic stems from its special microstructure: nanofibers are extremely thin in diameter (about 20–100 nm), which is easier to bind to water molecules than plant fibers; three-dimensional mesh pores

1. Introduction to bacterial cellulose Bacterial cellulose (BC) is a natural polymer material synthesized by microorganisms, with nano-scale fiber diameter (20–100 nm) and three-dimensional network structure. Compared with traditional plant cellulose, BC has higher purity and better crystallinity, and has excellent mechanical properties and biocompatibility, so it has great potential in the field of medical and health. 2. Key performance, high biocompatibility: does not trigger immune rejection reactions in the body; excellent water absorption: can absorb hundreds of times its own weight and keep the wound moist; good mechanical properties: flexible and stable, suitable for the repair of soft tissues of human body; nanopore structure: conducive to nutrient exchange and drug load; large functional space: antibacterial, conductive or sustained release effects can be achieved through modification. 3. Application in the medical and health field 1. Trauma dressings and artificial skin BC are highly absorbent and good.

Introduction Bacterial Cellulose (BC) is a natural polymer material synthesized by specific bacteria (such as Komagataeibacter xylinus). Compared with plant cellulose, bacterial cellulose has higher purity, stronger crystallinity and excellent mechanical properties, so it is widely used in the fields of food, medicine, cosmetics and new materials. Among the various preparation methods, Agitated Culture, as an important way to achieve large-scale production, has gradually become the focus of research and industrial production. Basic Principle of stir culture method The stir culture method is to evenly distribute bacteria in the liquid culture medium through mechanical stirring or gas stirring, so as to synthesize bacterial cellulose in the entire culture system. Unlike static culture that only forms thin films on the liquid surface, stirred culture can produce spherical and granules.

1. What is structural color? Structural color is a color formed by the interference, reflection and scattering of light by the material's micro-nano structure, and does not rely on traditional dyes. In nature, the gorgeous colors such as peacock feathers, butterfly wings, beetle shells, etc. originate from structural colors. Compared with traditional pigments, nanocellulose structural colors have the advantages of high brightness, non-fading, environmental protection and sustainability, and have become a hot topic in materials science in recent years. 2. The relationship between nanocellulose and structural color. Nanocellulose is a green and environmentally friendly material derived from natural cellulose. It has a diameter of only 3–50 nm and has high strength, light weight and self-assembly characteristics. When they are concentrated and arranged under appropriate conditions, a chiral nematic liquid crystal structure (Chiral Nematic Phase) can be formed. This spiral arrangement produces Bragg reflections on visible light, resulting in different wavelengths of colors. Through regulation

Keywords: bacterial cellulose, medical applications, trauma dressings, tissue engineering, artificial blood vessels, drug sustained release, Nanjing Tianlu Nano Technology Co., Ltd. Bacterial cellulose (BC) is a natural nanocellulose material secreted by Acetobacter xylinum and other acetate. Unlike plant cellulose, bacterial cellulose has ultra-high purity (free of lignin and hemicellulose), unique three-dimensional nano-network structure, excellent mechanical properties and good biocompatibility. These characteristics make it have extremely high application potential in the medical and health field. As an early domestic enterprise focusing on the research and development and production of nanocellulose, Nanjing Tianlu Nano Technology Co., Ltd. has long been committed to the process optimization, product application development and industrialization of bacterial cellulose. Through the improvement of fermentation process and the upgrading of post-treatment technology, the company has been able to provide stable and high purity and performance.

Introduction Nanocellulose (NC) is a nano-scale fiber material prepared by mechanical peeling, acid hydrolysis or chemical modification of natural cellulose. Its diameter is usually in the range of 1-100 nm and its length can reach several microns. It has unique advantages such as high specific surface area, high crystallinity, renewable and degradable. With the increase in the demand for green and sustainable materials, nanocellulose has gradually become an important candidate material for the medical and health industry, and its application ranges from basic medical consumables to high-end regenerative medical scaffolds continue to expand. The structural and characteristics of nanocellulose have strong surface chemical activity: its molecular chain is rich in hydroxyl groups, which can be functionally modified through TEMPO oxidation, carboxymethylation, graft polymerization, etc., giving the material controlled release, antibacterial or conductive properties. Excellent mechanical properties: the tensile strength of a single nanofiber can reach 2–6 GPa, Young's mold

Bacterial Cellulose (BC) is a natural polymer material synthesized by specific bacteria. It has high purity, high crystallinity and excellent mechanical properties. It is widely used in the fields of medicine, food, electronic materials and functional membranes. This article will systematically introduce common preparation methods for bacterial cellulose from the aspects of bacterial selection, culture medium formula, preparation method and post-treatment process.

Carboxylated Nanocellulose is one of the hot topics in the research and industrial application of nanomaterials in recent years. It uses natural cellulose as raw materials and introduces carboxylic (–COOH) functional groups on the surface of nanocellulose through chemical modification (such as TEMPO oxidation, carboxymethylation treatment, etc.), thereby significantly improving the dispersion, reactive activity and complex properties of the material with other polymer materials. 1. Principle of preparation of carboxylated nanocellulose. Traditional nanocellulose has a limited number of hydroxyl groups on the surface, and the interfacial compatibility is certainly insufficient. Carboxylation modification makes the C6-position hydroxyl group of cellulose to be added to the surface of the cellulose molecular chain, making it more hydrophilic and chemically active: TEMPO selective oxidation method: using the TEMPO/NaBr/NaClO system as the catalytic system, the C6-position hydroxyl group of cellulose is oxidized to the carboxy group. Carboxymethylation method: through etherification reaction in fiber

Application of nanocellulose in the field of water bombs 1. Introduction Water bombs (hydrogel projectiles) are gel particles formed by a highly absorbent polymer as the main body and after moisture expansion. Due to its high safety, soft touch, and reusable characteristics, it is widely used in children's toys, outdoor real-person confrontation, and non-lethal training equipment for military and police. However, traditional water bomb materials are mainly sodium polyacrylate high-water absorption resins. Although they have strong water absorption capacity, they have problems such as high brittleness, fragility, residual monomers may cause safety hazards and non-degradability. With the rise of the green material industry, nanocellulose, as a renewable nanomaterial derived from natural fibers, is providing new ideas for the performance upgrade and sustainable development of water bombs. 2. Structure and characteristics of nanocellulose Nanocellulose includes cellulose nanofibers (CNF), cellulose nanocrystals (CNC) and bacterial cellulose (BC), with the following typical characteristics: Ultrafine scale: straight

Introduction With the rapid development of renewable resources and green and environmentally friendly materials, nanocellulose (Nanocellulose) has gradually become a hot topic in scientific research and industrial fields due to its advantages such as lightweight, high strength, renewable and degradable. Among them, TEMPO oxidation modification, as an efficient and controllable surface functionalization method, gives nanocellulose more performance and application potential. This article will introduce the principles, characteristics and typical applications of TEMPO oxidized nanocellulose from a popular science perspective. What is TEMPO oxidation? TEMPO (2,2,6,6-tetramethylpiperidin-1-oxygen radical) is an organic radical catalyst. Under basic conditions, TEMPO works together with sodium hypochlorite (NaClO) and sodium bromide (NaBr) to selectively oxidize the primary hydroxyl group at the C6 position of cellulose molecule to carboxyl (–COOH). This reaction has the following advantages: strong selectivity: mainly