Multi Walled Carbon Nanotubes
- Benchmark: Benchmark 1
- Assessed: 2025-11-14
- Expires: 2026-06-24
Used primarily in and Industrial / Manufacturing applications, Multi Walled Carbon Nanotubes is specifically used in and mechanical strength.
Carbon nanotubes (CNT) are a group of nanomaterials consisting of only one or several hexagonal graphite sheets of carbon atoms rolled into tubes. They are black crystalline particles that are highly insoluble in water due to their graphitic structure. CNTs have very high aspect ratios with diameters lower than about 100 nm (0.000001 mm) and lengths that can reach several hundred micrometers. CNTs fall into two classes: single-walled carbon nanotubes (MWCNTs) and multi-walled carbon nanotubes (MWCNTs). Despite the obvious commonality, SWCNTs and MWCNTs have significantly different physical properties from each other because of their structural differences. The CAS number of 308068-56-6 is assigned to carbon nanotubes in general regardless of the types (single, double or multi wall).
MWCNTs consist of many single-walled tubes stacked one inside the other with diameters in the range of 2–100 nm, depending on the number of encapsulated tubes forming the CNT structure. MWCNTs also tend to form bundles, but the van der Waals forces are usually weaker than those of single walled (SW) CNTs and MWCNT are therefore more likely to exist as single fibers. Due to differences in manufacturing processes, MWCNTs can vary widely with respect to their form (tube length and diameter), particle size, specific surface area and residual impurities and, consequently, they might exert quite different toxic effects. There are basically two different forms of MWCNT that are available commercially: one with a more rigid, long-fiber (asbestos-like) morphology and another one with a more tangled, short, low-density agglomerate form.
Chemical Synonyms Carbon nanotubes, Fullerenes, tubular, Tubular fullerenes, Tubulenes
Key Functions: Industrial / Manufacturing