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.

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?

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

1D Related Products

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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.