Overview
Carboxylated Cellulose Nanocrystal (C-CNC) is a rod-shaped nanomaterial derived from natural cellulose, with a typical diameter of approximately 5–30 nm and a length of approximately 100–500 nm. Its surface is rich in hydroxyl and carboxyl groups, providing excellent water dispersibility, hydrophilicity, and interfacial functionalization capabilities. C-CNC also exhibits a high elastic modulus, low density, and low coefficient of thermal expansion.
General information
| Product Name | Carboxylated Cellulose Nanocrystals |
|---|---|
| Abbreviation | C-CNC / COOH-CNC |
| Surface Functional Groups | Carboxyl Groups、Hydroxyl Groups |
| Product Form | Aqueous Dispersion / Powder |
| Raw Material Source | Plant-Derived Cellulose |
| Surface Charge | Anionic |
Specifications
| Appearance | White to Light Blue Liquid |
|---|---|
| Solid Content | 2-10wt% (Available upon request) |
| Diameter | 5-20nm |
| Length | 100-400nm |
| Crystallinity | ≥75% |
| Carboxyl Group Content | 0.3-0.6mmol/g |
| pH | 6-8 |
| Dispersion Medium | Deionized Water |
Product details
Product Appearance
Product Characterization
Recommended Application Areas
Polymer Composites；Hydrogels；Functional Films and Coatings；Adsorption and Separation；Bio-Based Materials；Interfacial Modification.
How to Use Carboxylated Cellulose Nanocrystals ?
Recommended Dosage
For preliminary trials, a dosage of 0.1–3 wt% based on the dry weight of the matrix is recommended. For reinforcement applications, it is recommended to initially evaluate three dosage levels: 0.5%, 1%, and 2%.
Addition Method
For aqueous systems, pre-dilute and disperse the carboxylated CNC in deionized water before gradually adding it to the resin, polymer, hydrogel, or coating formulation under continuous stirring.
Dispersion Method
Mechanical stirring is generally sufficient for dispersion. For systems requiring a higher degree of dispersion or for high-viscosity formulations, high-shear mixing or moderate ultrasonication can be used as auxiliary dispersion methods.
Precautions
Avoid directly adding high-concentration CNC dispersions to systems containing high levels of salts or multivalent ions. If aggregation or flocculation occurs, it is recommended to first optimize the addition sequence, CNC concentration, pH, and ionic strength of the formulation.
Recommended Evaluation Procedure
For initial testing, it is recommended to establish a blank control and evaluate three CNC dosage levels of 0.5%, 1%, and 2%. The optimum dosage can then be determined based on dispersion stability, viscosity, mechanical properties, or other target functional requirements.
Packaging and Transportation
Available in gram-scale samples, kilogram-scale trial quantities, and bulk orders of one metric ton or more, meeting the procurement needs of different stages, from laboratory research and testing to pilot-scale validation and industrial-scale applications.
Samples are supplied in sealed packaging and are preferably shipped via international express delivery. Please contact our customer service team for an international shipping quotation when placing an order.
For kilogram-scale and larger quantities, packaging options such as drums, large drums, or IBC totes are selected according to the product form and order volume, with an appropriate logistics and transportation method arranged accordingly.
FAQ
Q: What is the difference between carboxylated CNC and conventional CNC?
A: Carboxylated CNC contains carboxyl groups introduced onto the cellulose nanocrystal surface in addition to the inherent hydroxyl groups. This provides a more pronounced anionic surface character, ionic interaction capability, and potential for further functionalization. Conventional hydroxyl-functionalized CNC is generally more focused on fundamental applications such as rigid nanoscale reinforcement.
Q: What is the difference between carboxylated CNC and carboxylated CNF? How should I choose between them?
A: CNC consists of relatively short, rigid, rod-like nanocrystals and is well suited for nanoscale reinforcement, functional fillers, and interfacial modification. CNF has a higher aspect ratio and can more readily form interconnected fibrous networks, making it particularly suitable for rheological modification, hydrogel formation, film formation, and toughness enhancement.
Q: Why is carboxylated CNC suitable for heavy-metal adsorption and functional materials?
A: The carboxyl groups provide ionic interaction sites and functionalization sites, making carboxylated CNC suitable for research involving metal-ion adsorption, interfacial composites, and functional carrier materials. Actual adsorption performance is also affected by factors such as pH, ionic strength, and carboxyl group content.
Q: What is the typical dosage of carboxylated CNC? What should I do if aggregation occurs?
A: For applications such as composite reinforcement, an initial dosage of 0.1–3 wt% based on the dry weight of the matrix can be evaluated in preliminary trials. If aggregation occurs, first check the addition sequence, CNC concentration, pH, salt concentration, and presence of multivalent ions. Pre-dilution followed by moderate shear mixing or ultrasonication can also be used to improve dispersion.