Overview
An anionic CNC with sulfate ester groups on its surface, offering good colloidal stability in aqueous media and well-defined surface charge characteristics. It is suitable for applications in nanocomposites, film formation, structural assembly, and fundamental research.
General information
| Product Name | Sulfated Cellulose Nanocrystals |
|---|---|
| Abbreviation | S-CNC |
| Surface Functional Groups | –OH、–OSO₃H |
| Product Form | Aqueous Dispersion / Powder |
| Raw Material Source | Plant-Derived Cellulose |
| Surface Charge | Anionic |
Specifications
| Appearance | White Liquid |
|---|---|
| Solid Content | 2-8wt%（Available upon request） |
| Diameter | 10-20nm |
| Length | 100-400nm |
| Crystallinity | ≥85% |
| Surface Functional Group Content | 0.04mmol/g |
| pH | 6-8 |
| Dispersion Medium | Deionized Water |
Product details
Product Appearance
Product Characterization
Recommended Application Areas
Colloidal Dispersion；Self-Assembly；Structural Color Research；Functional Films；Coatings；Nanocomposites
Application Guidelines for Sulfated Cellulose Nanocrystals (S-CNC)
Recommended Dosage
For preliminary trials, a dosage of 0.1–3 wt% based on the dry weight of the matrix is recommended. For reinforcement or film-forming applications, an initial dosage range of 0.5–2 wt% can be evaluated.
Addition Method
Preferably pre-disperse S-CNC in the aqueous phase, then gradually add it to the polymer, coating, or composite formulation under continuous stirring.
Dispersion Method
Mechanical stirring can generally be used for aqueous systems. If necessary, short-duration ultrasonication can be applied as an auxiliary dispersion method.
Precautions
The surface of S-CNC contains –OSO₃H groups, making it relatively sensitive to electrolytes and oppositely charged components. High-salt environments may reduce colloidal stability.
It is recommended to systematically compare dispersion stability, zeta potential, rheological properties, and film-forming or reinforcement performance at different S-CNC dosages to determine the optimal formulation.
Packaging and Transportation
Available in gram-scale samples, kilogram-scale trial quantities, and bulk orders of one metric ton or more, meeting procurement needs at different stages, including research and testing, 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 function of sulfate half-ester groups on the surface of sulfuric-acid-hydrolyzed CNC?
A: Upon ionization, sulfate ester groups impart a negative surface charge to CNC, enhancing electrostatic repulsion between particles and improving colloidal stability in aqueous systems. At the same time, the charged surface makes CNC more sensitive to salts and oppositely charged components.
Q: Is ultrasonication necessary before using CNC/CNF in experiments? Can ultrasonication affect the material?
A: When CNC exhibits aggregation, mild and short-duration ultrasonication can be used as an auxiliary dispersion method. Whether ultrasonication is necessary depends on the initial dispersion state. Excessive sonication intensity or prolonged treatment may alter the particle size distribution or the overall state of the dispersion. Experimental sonication conditions should therefore be kept consistent.
Q: What types of material systems are suitable for sulfated CNC?
A: Sulfated CNC is suitable for research involving aqueous colloidal systems, self-assembly, functional films, coatings, and nanocomposites, particularly for systems requiring a pronounced anionic surface and good water dispersibility.
Q: Why may S-CNC flocculate in the presence of salts, and how should this be addressed in formulations?
A: Salts increase the ionic strength of the system and reduce electrostatic repulsion between CNC particles. The effect is generally more pronounced with multivalent ions. It is recommended to pre-dilute S-CNC, reduce the local CNC concentration, and optimize the addition sequence, pH, and salt concentration through preliminary formulation trials.