Author Topic: Carbon nanotube  (Read 329 times)

Offline Esrat

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Carbon nanotube
« on: January 15, 2015, 01:34:38 PM »
Carbon nanotubes (CNTs) are allotropes of carbon with a cylindrical nanostructure. Nanotubes have been constructed with length-to-diameter ratio of up to 132,000,000:1, significantly larger than for any other material. These cylindrical carbon molecules have unusual properties, which are valuable for nanotechnology, electronics, optics and other fields of materials science and technology. In particular, owing to their extraordinary thermal conductivity and mechanical and electrical properties, carbon nanotubes find applications as additives to various structural materials. For instance, nanotubes form a tiny portion of the material(s) in some (primarily carbon fiber) baseball bats, golf clubs, car parts or damascus steel.

Nanotubes are members of the fullerene structural family. Their name is derived from their long, hollow structure with the walls formed by one-atom-thick sheets of carbon, called graphene. These sheets are rolled at specific and discrete ("chiral") angles, and the combination of the rolling angle and radius decides the nanotube properties; for example, whether the individual nanotube shell is a metal or semiconductor. Nanotubes are categorized as single-walled nanotubes (SWNTs) and multi-walled nanotubes (MWNTs). Individual nanotubes naturally align themselves into "ropes" held together by van der Waals forces, more specifically, pi-stacking.

Applied quantum chemistry, specifically, orbital hybridization best describes chemical bonding in nanotubes. The chemical bonding of nanotubes is composed entirely of sp2 bonds, similar to those of graphite. These bonds, which are stronger than the sp3 bonds found in alkanes and diamond, provide nanotubes with their unique strength.

Offline Shabnam Sakia

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Re: Carbon nanotube
« Reply #1 on: February 10, 2015, 03:29:15 PM »
It is the thinnest material which is good conductor of heat and electricity. One of the good example is Graphene.
Sakia Shabnam Kader
Senior Lecturer (Physics)
Department of General Educational Development

Offline Mostakima Mafruha Lubna

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Re: Carbon nanotube
« Reply #2 on: February 22, 2015, 06:27:18 PM »
CNTs are the most valuable invention of technology, I have the opportunity to work with MWCNTs. These things are really incredible for changing physical,mechanical,thermal and electronic properties of polymer in a composite. I am using CNTs in bio-nanomaterials.
Mostakima Mafruha Lubna
Lecturer (ACCT)
Dept. of Textile Engineering, FE
lubna.ns@daffodilvarsity.edu.bd

Offline ABM Nazmul Islam

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Re: Carbon nanotube
« Reply #3 on: March 04, 2015, 09:42:58 AM »
Interesting post
ABM Nazmul Islam

Lecturer
Dept. of Natural Science
Daffodil Int. University, Dhaka, Bangladesh