Carbon nanotubes are materials that possess remarkable properties and offer extraordinary possibilities. This article gives a brief overview of the physico-chemical nature and characterization of multi-walled carbon nanotubes (MWNTs). Single-walled carbon nanotubes and multi-walled carbon nanotubes share some similarities, but also some of significant differences. Multi-walled carbon nanotubes can be thought of as a series of single walled tubes nested within one another. There may be as few as 2, or as many as 100 plus concentric walls. Their diameters may, therefore, be as great as 50nm as opposed to 0.7 - 2.0 nm for a typical single-walled carbon nanotubes . Just the outer wall generally contributes to the electrical and mechanical properties of multi-walled carbon nanotubes when used in composites, for example, affording the opportunity for much lower loading of single-walled carbon nanotubes versus multi-walled carbon nanotubes. Multi-walled carbon nano...
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