Double Walled Carbon Nanotubes, Purity: > 65%

Technical Specification:

1. Material Composition:
   • Structure: Double-Walled Carbon Nanotubes (DWCNTs).
     • Comprised of two concentric graphene cylinders.
   • Purity: >65%.
     • Includes a mix of DWCNTs, single-walled carbon nanotubes (SWCNTs), and multi-walled carbon nanotubes (MWCNTs) with trace amounts of amorphous carbon or residual catalysts.
   • Outer Diameter: 1–5 nm, depending on synthesis method.
   • Length: Generally in the range of 5–30 µm.
2. Physical Properties:
   • Form: Black powder.
   • Specific Surface Area: 200–800 m²/g, depending on the degree of purity and processing.
   • Density: ~ 1.8–2.0 g/cm³.
3. Electrical and Thermal Properties:
   • Electrical Conductivity:
     • High conductivity due to the graphene lattice structure, though slightly less than higher-purity DWCNTs.
   • Thermal Conductivity:
     • Excellent along the tube axis, typically in the range of 1000–2000 W/m·K.
4. Mechanical Properties:
   • Tensile Strength: ~ 20–30 GPa, depending on purity and structural integrity.
   • Elastic Modulus: 0.5–1 TPa, ensuring stiffness.
5. Chemical Properties:
   • Chemical Stability:
     • Resistant to oxidation, acids, and bases under standard conditions.
   • Functionalization:
     • Can be chemically modified to improve solubility and compatibility with various systems.
6. Packaging:
   • Typically supplied in sealed containers ranging from 1 g to 1 kg, depending on application needs.

Applications:

1. Primary Applications:
   • Energy Storage:
     • Serves as a conductive additive in lithium-ion batteries, supercapacitors, and fuel cells.
   • Reinforced Composites:
     • Improves mechanical, thermal, and electrical properties of polymers, ceramics, and metals.
   • Conductive Coatings:
     • Used in coatings for electromagnetic shielding and antistatic applications.
2. Industries:
   • Electronics:
     • Applied in flexible circuits, transparent conductive films, and sensors.
   • Energy:
     • Enhances the efficiency of renewable energy systems and energy storage devices.
   • Automotive:
     • Used in lightweight conductive components and advanced battery technologies.
   • Aerospace:
     • Reinforces lightweight materials for structural and thermal management applications.
3. Advantages for Applications:
   • Cost-Effectiveness:
     • Provides a balance between performance and cost compared to higher-purity DWCNTs.
   • High Strength-to-Weight Ratio:
     • Ideal for lightweight, high-strength applications.
   • Thermal and Electrical Conductivity:
     • Supports advanced thermal management and efficient electronic components.
   • Versatile Integration:
     • Can be used in coatings, composites, and energy storage systems.
4. Specialized Uses:
   • Catalysis:
     • Acts as a support for metal nanoparticles in catalytic applications.
   • Sensors:
     • Enhances sensitivity and specificity in gas and chemical sensors.
   • Water Treatment:
     • Adsorbs pollutants and heavy metals for environmental remediation.
   • Nanotechnology:
     • Serves as a base material for advanced nanostructures.
5. Challenges and Mitigation:
   • Lower Purity:
     • Contains a mix of carbon nanotubes and residual amorphous carbon.
       • Solution: Use for applications where ultra-high purity is not critical, or further purify as needed.
   • Dispersion:
     • Prone to agglomeration in solutions.
       • Solution: Use surfactants or ultrasonication to achieve stable dispersions.
   • Variability:
     • Properties may vary slightly due to mixed composition.
       • Solution: Select application-specific grades for optimal performance.

Storage Guidelines:

• Temperature: Store in a cool, dry place, away from moisture and direct sunlight.
• Container: Keep in sealed, airtight containers to prevent contamination.
• Handling: Use appropriate personal protective equipment (PPE) to avoid inhalation or contact with skin.

Summary:

Double-Walled Carbon Nanotubes (DWCNTs) with >65% purity are versatile nanomaterials suitable for energy storage, composites, coatings, and catalysis. While they offer slightly reduced purity compared to higher-grade DWCNTs, their cost-effectiveness and excellent mechanical, electrical, and thermal properties make them ideal for a wide range of applications. Proper handling and dispersion techniques ensure consistent performance in industrial and research applications.