Carbon nanotubes (CNTs) are allotropes of carbon having a cylindrical nanostructure.
Carbon Nanotubes are a tube-shaped material made up of carbon molecules, having a diameter of approximately a nanometer (one-billionth of a meter or one ten-thousandth of the thickness of a human hair). Carbon nanotubes has many different structures, depending on length, thickness and type of helicity (projection of the spin on direction of momentum), and number of layers.
All carbon nanotubes are made up of similar graphite sheet. However, the electrical characteristics of carbon nanotubes (acting as metals or semiconductor) depends on the structure they exhibit. Carbon nanotubes exhibit excellent mechanical strength, comparable to graphite. They can replace other materials in wide range of application such as; consumer goods, electrical and electronics, energy, healthcare, automobile, aerospace, and defense sectors. Other applications include;, conductive plastics, flat-panel displays, gas storage, batteries with improved lifetime, technical textiles, antifouling paint and micro- and nano-electronics.
Carbon nanotube materials can be categorised on the bases of structure and number of layers; single-wall nanotubes (SWNT) (having diameter close to 1nm), multi-wall nanotubes (MWNT) (diameter ranging between 5 nm to 50 nm) and double-wall nanotubes (DWNT) (sub-segment of multi-wall nanotubes). Multi-wall nanotube has the major market share in the global carbon nanotube market, followed by single-wall nanotubes.
 Related articles on Designing Buildings Wiki
Featured articles and news
UandI adds £1.5bn to development pipeline.
Here are 5 things leaders can do to create a truly circular economy.
Find out about the different types of delays on construction projects.
Researchers at Wien university have developed new system to create an inflatable concrete structure.
ICE responds to the first consultation on the government's industrial strategy post-Brexit.
Take a look at this newly-opened tower in Chicago with a remarkable 20:1 height-to-base ratio.
An Arc de Triomphe for the late-20th century, the La Grande Arche of Paris.
Richard Hayward of Legrand asks whether technology could help developers meet the needs of an increasingly diverse population.
Thomas Heatherwick's ambitious steel structure begins construction.
The principles, practice and formwork of one of the most important components of modern architecture.