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Views: 0 Author: Site Editor Publish Time: 2025-05-01 Origin: Site
Cellulose Nanocrystals ( CNC ) is a nanomaterial made from acid hydrolysis of natural plant fibers. It has the advantages of high crystallinity, high strength, low density, renewable and degradable . It is one of the hot topics in current research on green materials. This article will give a comprehensive introduction to the source structure performance and typical applications of CNC.
Cellulose nanocrystals are rod-shaped nanoparticles produced by acid hydrolysis of natural cellulose (such as wood pulp, cotton, sugarcane bagasse, etc.), removing disordered amorphous regions, and retaining crystalline regions. This material belongs to one of the ** nanocellulose family, and is widely used in packaging composite materials, coatings, medical materials and other fields .
Graphic : Rigid rod-shaped crystal
Size range : 3–20 nm in diameter , 100–500 nm in length
Crystallinity : up to 60%–90%
Surface structure : Rich in hydroxyl groups, can be further chemically modified
CNC is mainly prepared by sulfuric acid hydrolysis . By controlling the reaction time and temperature, selectively removing the sulfonate group introduced by sulfuric acid in the amorphous region can improve its dispersion in water, but it will also slightly affect the thermal stability.
The preparation process includes:
Raw material pretreatment (wood pulp or cotton, etc.)
Acid hydrolysis reaction
Neutralization centrifugal cleaning
Freeze-drying or ultrasonic dispersion
performance | Performance |
High intensity | Tensile strength can reach steel level |
Large specific surface area | Easy to compound and modify |
Strong dispersibility | Stable suspension in water |
Good biocompatibility | Suitable for medical or food contact materials |
Plastic reinforcement : used as a natural reinforcement agent for polymer composite materials to improve mechanical properties;
Functional coating : for transparent coating barrier film ink;
Biomedicine : Preparation of biostent drug controlled release carriers;
Flexible electrons : used for flexible electrode conductive films;
Green packaging materials : alternative plastics to meet the needs of biodegradable and environmental protection
With the increase in environmental protection requirements, cellulose nanocrystals, as a new renewable biodegradable green and environmentally friendly material, will have broader application prospects in the fields of pharmaceutical electronic food packaging and other fields. Future research will focus more on low-cost preparation surface functionalization and large-scale industrial applications.
