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Views: 0 Author: Site Editor Publish Time: 2024-11-28 Origin: Site
As an emerging nanomaterial, nanocellulose crystals (NCCs) have attracted widespread attention due to their unique physical and chemical properties and environmentally friendly and renewable characteristics. This article will introduce in detail the preparation method, properties and its application prospects in multiple fields.
The preparation of nanocellulose crystals is usually achieved by inorganic acid hydrolysis and cellulase hydrolysis.
1.
Inorganic acid hydrolysis method : This method was first proposed by Nickerson and Habrle in 1947, using hydrochloric acid and sulfuric acid to hydrolyze wood and cotton fibers. Sulfuric acid is the most commonly used acid. By controlling the acid concentration, reaction temperature and time, NCC with different characteristics can be obtained. The key to this method is to remove the amorphous region in the cellulose by strong acid hydrolysis, retain the crystalline region, and form rod-shaped NCC.
2.
Cellulase hydrolysis method : This method uses cellulase to hydrolyze cellulose, which is more environmentally friendly than acid hydrolysis method, and can obtain higher quality and purity NCC. Cellulases usually include endoglucosidase and exoglucosidase. Through the synergistic action of these two enzymes, nanoscale cellulose crystals can be effectively isolated.
Nanocellulose crystals not only have the basic characteristics of cellulose, but also exhibit the unique properties of many nanomaterials.
1.
Shape and size : NCC is usually rod-shaped and has a particle size between 30-100 nm. Its shape and size distribution depend on the type of cellulose and the acid hydrolysis treatment conditions.
2.
Crystality : The crystallinity of NCC is higher than that of natural cellulose, because the amorphous region is destroyed during the preparation process, resulting in an increase in the proportion of crystalline region.
3.
Strength and thermal stability : NCC has high strength and good thermal stability, and its tensile strength and elastic modulus are better than many traditional materials. However, due to the small particle size and large specific surface area, the thermal stability of NCC is slightly lower than that of microcrystalline cellulose (MCC).
4.
Thixotropy and rheology : NCC colloids have good thixotropy and shear dilution denaturation, which makes NCC show good rheological properties during application.
The excellent properties of nanocellulose crystals make them have broad application prospects in many fields.
1.
Pulp and paper : NCC can be added to paper as a reinforcement material to improve paper strength, wear resistance and optical properties.
2.
Nanocomposite materials : NCC can be combined with polymers to prepare high-strength and high-toughness nanocomposite materials, which are widely used in automobiles, construction, packaging and other industries.
3.
Biomedicine : Due to its biocompatibility and degradability, NCCs show great potential in drug delivery, tissue engineering and other fields.
4.
Environmentally friendly materials : NCC can be extracted from various natural fibers and is an environmentally friendly and renewable material that meets the needs of modern society for sustainable development.
Nanjing Tianlu Nano Technology Co., Ltd. is a high-tech company specializing in the green preparation, research and development and application of nanocellulose. Dedicated to the production, research and development and sales of nanocellulose series products, as well as commercial solutions for the promotion of nanocellulose. And create brand products, pursue better services, and help customers maintain competitive advantages in the fierce market environment.
