Multi-walled carbon nanotubes (MWCNTs) are a special form of carbon nanotubes in which multiple single-walled carbon nanotubes are nested inside one another. Although MWCNTs are still classed as a 1-dimenional form of carbon, the unique properties that are seen within single-walled and double-walled carbon nanotubes are not as prominent. The reason for this is the higher probability of defects occurring . These disadvantages are offset by the increased dispersability of MWCNTs, and the reduced cost in synthesis and purification of these materials. At Ossila we sell a range of MWCNT"s with different purities and and diameters. Additionally, we sell -carbolic acid (COOH) and hydroxyl (-OH) functionalised nanotubes in a range of different diameters. |  | |
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Product List
All our MWCNTs come packed as dry powders, which can be dispersed within the users solvent of choice.
Multi-Walled Carbon Nanotube Powders
| Product code | M2008D1 | M2008D2 | M2008D3 | M2008D4 | M2008D5 |
| Internal Diameter | 2-5 nm | 5-10 nm | 5-10 nm | 5-12 nm | 5-15 nm |
| Outer Diameter | <8 nm | 15 nm | 25 nm | 40 nm | >50 nm |
| Length | 10-30 μm | 10-30 μm | 10-30 μm | 10-30 μm | 10-30 μm |
| Specific Surface Area | > 500 m2.g-1 | > 200 m2.g-1 | > 110 m2.g-1 | > 60 m2.g-1 | > 40 m2.g-1 |
| Purity | > 95% | > 95% | > 95% | > 95% | > 95% |
| MSDS |  | ||||
| Sale Quantities | 500 mg, 1 g, 5 g | ||||
| Packaging Information | Light-resistant bottle | ||||
*For larger orders, please email us to discuss prices
High-Purity Multi-Walled Carbon Nanotube Powders
| Product code | M2009D1 | M2009D2 | M2009D3 | M2009D4 | |
| Internal Diameter | 5-10 nm | 5-10 nm | 5-12 nm | 5-15 nm | |
| Outer Diameter | 15 nm | 25 nm | 40 nm | >50 nm | |
| Length | 10-30 μm | 10-30 μm | 10-30 μm | 10-30 μm | |
| Specific Surface Area | > 100 m2.g-1 | > 55 m2.g-1 | > 30 m2.g-1 | > 20 m2.g-1 | |
| Purity | > 99.9% | > 99.9% | > 99.9% | > 99.9% | |
| MSDS | | ||||
| Sale Quantities | 500 mg, 1 g, 5 g | ||||
| Packaging Information | Light-resistant bottle | ||||
*For larger orders, please email us to discuss prices.
COOH Functionalised Multi-Walled Carbon Nanotube Powders
| Product code | M2010D1 | M2010D2 | M2010D3 | M2010D4 | |
| Internal Diameter | 5-10 nm | 5-10 nm | 5-12 nm | 5-15 nm | |
| Outer Diameter | 15 nm | 25 nm | 40 nm | >50 nm | |
| Length | 10-20 μm | 10-20 μm | 10-20 μm | 10-20 μm | |
| COOH Content | 1.0% | 0.6% | 0.4% | 0.3% | |
| Specific Surface Area | > 120 m2.g-1 | > 55 m2.g-1 | > 30 m2.g-1 | > 30 m2.g-1 | |
| Purity | > 99.9% | > 99.9% | > 99.9% | > 99.9% | |
| MSDS | | ||||
| Sale Quantities | 500 mg, 1 g, 5 g | ||||
| Packaging Information | Light-resistant bottle | ||||
*For larger orders, please email us to discuss prices.
OH Functionalised Multi-Walled Carbon Nanotube Powders
| Product code | M2011D1 | M2011D2 | M2011D3 | M2011D4 | |
| Internal Diameter | 5-10 nm | 5-10 nm | 5-12 nm | 5-15 nm | |
| Outer Diameter | 15 nm | 25 nm | 40 nm | > 50 nm | |
| Length | 10-20 μm | 10-20 μm | 10-20 μm | 10-20 μm | |
| OH Content | 1.3% | 0.8% | 0.5% | 0.4% | |
| Specific Surface Area | > 100 m2.g-1 | > 55 m2.g-1 | > 30 m2.g-1 | > 20 m2.g-1 | |
| Purity | > 99.9% | > 99.9% | > 99.9% | > 99.9% | |
| MSDS | | ||||
| Sale Quantities | 500 mg, 1 g, 5 g | ||||
| Packaging Information | Light-resistant bottle | ||||
*For larger orders, please email us to discuss prices.
What are Multi-Walled Carbon Nanotubes?
MWCNTs consist of multiple carbon nanotubes nested within one another. The number of nanotubes that are within a MWCNT can vary - from as little as 3, to over 20. At the same time the diameter of both the internal nanotube and the external most nanotube can vary - from 2nm for the innermost tube, to over 50nm for the outer wall. Just like single-walled nanotubes, they exhibit exceptional electrical, thermal, and mechanical properties. However, due to the increased number of walls, there is a higher likelihood of defects being present compared to single-walled nanotubes - resulting in reduced performances. The outer walls of MWCNTs can be modified with functional groups such as hydroxides, carboxylic acids, or amides to produce additional functionality (e.g. improved dispersability, or the ability to attach binding sites for use in biomedical applications). MWCNTs can be produced in high quantities and are easier to purify (in comparison to single walled and double-walled nanotubes). This makes their production costs significantly lower, and is a reason for their adoption in multiple areas of scientific research. Applications of MWCNTs have been mainly focused around their use in composites where they can be used as an additive. either to: i) improve the mechanical properties of a material, or ii) to improve the electrical properties of a material. Aside from being used as additives, functionalised MWCNTs are being utilised in a variety of medical and biotechnological applications. This is due to their high biocompatibility of carbon nanotubes and the ability to attach specific proteins to functional groups. This can provide a wide variety of targeted therapies such as drug delivery, localised heating for triggering cell death, or even miniature biosensors for in-situ measurements. |
Dispersion Guides
Like single walled carbon nanotubes, MWCNT"s are insoluble. For dispersing in aqueous solutions we recommend the use of sodium dodecylbenzene sulfonate if an ionic surfactant is suitable if a nonionic surfactant is needed we recommend surfactants with high molecular weights.
- Weigh out the desired amount of nanotubes.
- Mix together your solvent and surfactant of choice at the desired surfactant concentration. This should be below the critical micelle concentration of the surfactant.
- Add the solvent-surfactant mix to the dry powder and shake vigorously to mix.
- Either place an ultrasonic probe into the solution or place the solution into an ultrasonic bath. Be careful about the length of time and power used, as damage to the carbon nanotubes can occur, shortening their average length.
- The resulting solution will be a mixture of suspended nanotubes and bundles of nanotubes, further sonication will help break up the bundles.
- To separate out the individual nanotubes in solution from the bundles the solution should be placed within a centrifuge. If the solution is centrifuged for a longer time and/or at a higher the smaller bundles will be removed narrowing the distribution of suspended nanotubes.
For functionalised nanotubes it is possible to disperse them without the use of any surfactants. However, the total concentration of dispersed nanotubes will be lower. A maximum of 0.1mg/ml can be achieved for COOH and OH.
Technical Data
General Information
| CAS number | 7440-44-0 |
| Chemical formula | CxHy |
| Recommended Dispersants | DI Water, DMF, THF, Ethanol, Acetone |
| Synonyms | Multi-Walled Carbon Nanotubes, Multi Wall Carbon Nanotube, Carbon Nanotube, MWNT, MWCNT |
| Classification / Family | 1D materials, Carbon nanomaterials, Nanomaterials, Polycyclic aromatic hydrocarbons, thin-film electronics. |
| Colour / Appearance | Black fibrous powder |
1D Related Products
Single-Wall Carbon Nanotubes
Double-Walled Carbon Nanotubes
Multi-Walled Carbon Nanotube Publications
- Thermal and Electrical Conductivity of Single and Multi-Walled Carbon Nanotube-Epoxy Composites, A Moisala et.al., Compos. Sci. Technol., 66, 1285-1288 (2006) DOI: 10.1016/j.compscitech.2005.10.016
- 99.9% Purity Multi-Walled Carbon Nanotubes by Vacuum High-Temperature Annealing, W. Huang, et. al., Carbon, 41, 2585-2590, (2003) DOI: 10.1016/S0008-6223(03)00330-0
- Elastic Moduli of Multi-Walled Carbon Nanotubes and the Effect of Van der Waals Forces, C. Li, et. al., 63, 1517-1524, (2003) DOI: 10.1016/S0266-3538(03)00072-1
- Low Percolation Threshold of Electrical Conductivity and Rheology in poly(Ethylene Terephthalate) Through the Networks of Multi-Walled Carbon Nanotubes, G. Hu, et. al., 47, 480-488, (2006) DOI: 10.1016/j.polymer.2005.11.028
- Mechanical Behaviour and Microstructure of Cement Composites Incorporating Surface-Treated Multi-Walled Carbon Nanotubes, G. Ying, et. al., 43, 1239-1245, (2005) DOI: 10.1016/j.carbon.2004.12.017
- Surface Modified Multi-Walled Carbon Nanotubes in CNT/Epoxy Composites, F. H. Gojny, et. al., Chem. Phys. Lett., 370, 820-824, (2003) DOI: 10.1016/S0009-2614(03)00178-8
- Chemical Oxidation of Multi-Walled Carbon Nanotubes, V. Datsyuk, et. al., Carbon, 46, 833-840, (2008) DOI: 10.1016/j.carbon.2008.02.012
To the best of our knowledge, the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.
