Navigation Links
Nanotube's 'tapestry' controls its growth

HOUSTON -- (Feb. 5, 2009) -- Rice University materials scientists have put a new "twist" on carbon nanotube growth. The researchers found the highly touted nanomaterials grow like tiny molecular tapestries, woven from twisting, single-atom threads.

Carbon nanotubes are hollow tubes of pure carbon that measure about one nanometer, or one-billionth of a meter, in diameter. In molecular diagrams, they look like rolled-up sheets of chicken wire. And just like a roll of wire or gift-wrapping paper, nanotubes can be rolled at an odd angle with excess hanging off the end.

Though nanotubes are much-studied, their growth is poorly understood. They grow by "self assembly," forming spontaneously from gaseous carbon feedstock under precise catalytic circumstances. The new research, which appears online this week in the Proceedings of the National Academy of Sciences, finds a direct relationship between a nanotube's "chiral" angle -- the amount it's twisted -- and how fast it grows.

"Our study offers some clues about this intimate 'self assembly' process," said Rice's Boris Yakobson, professor in mechanical engineering and materials science and of chemistry. New theory suggests that each tube is 'woven' from many twisting threads. Each grows independently, with new atoms attaching themselves to the exposed thread ends. The more threads there are, the faster the whole tapestry grows.

Yakobson, the lead researcher on the project, said the new formula's predictions have been borne out by a number of laboratory reports. For example, the formula predicts that nanotubes with the largest chiral angle will grow fastest because they have the most exposed threads -- something that's been shown in several experiments.

"Chirality is one of the primary determinants of a nanotube's properties," said Yakobson. "Our approach reveals quantitatively the role that chirality plays in growth, which is of great interest to all who hope to incorporate nanotubes into new technologies."


Contact: Jade Boyd
Rice University

Related biology news :

1. The gold standard: Biodesign Institute researchers use nanoparticles to make 3-D DNA nanotubes
2. Researchers make breakthrough in the production of double-walled carbon nanotubes
3. MIT nanotubes sniff out cancer agents in living cells
4. UNC study on properties of carbon nanotubes, water could have wide-ranging implications
5. Simulations help explain fast water transport in nanotubes
6. Slipping through cell walls, nanotubes deliver high-potency punch to cancer tumors in mice
7. Nanotubes could help study retrovirus transmission between human cells
8. Livermore researchers use carbon nanotubes for molecular transport
9. Spin control: New technique sorts nanotubes by length
10. Using carbon nanotubes to seek and destroy anthrax toxin and other harmful proteins
11. Another type of nanotube, a how-to guide to making bamboo-structured carbon nanotubes
Post Your Comments:
Related Image:
Nanotube's 'tapestry' controls its growth
(Date:10/29/2015)... 2015   MedNet Solutions , an innovative SaaS-based ... clinical research, is pleased to announce that it has ... as one of only three finalists for a ... and Growing" category. The Tekne Awards honor Minnesota ... technology innovation and leadership. iMedNet™ eClinical ...
(Date:10/29/2015)... RESTON, Va. , Oct. 29, 2015 ... announced today that it has released a new version ... Daon customers in North America ... gains. IdentityX v4.0 also includes a FIDO UAF ... customers are already preparing to activate FIDO features. These ...
(Date:10/29/2015)... 2015  Connected health pioneer, Joseph C. Kvedar ... technology-enabled health and wellness, and the business opportunities that ... The Internet of Healthy Things . Long before ... existed, Dr. Kvedar, vice president, Connected Health, Partners HealthCare, ... moving care from the hospital or doctor,s office into ...
Breaking Biology News(10 mins):
(Date:11/30/2015)... , November 30, 2015 TapImmune, ... the development of innovative peptide and gene-based immunotherapeutics and ... today announced it will be presenting at the 8 ... 1, 2015 at 2.30 PM PT. Dr. John ... Advisor will be giving the presentation and will join ...
(Date:11/30/2015)... 2015  Northwest Biotherapeutics (NASDAQ: NWBO ) ("NW ... therapies for solid tumor cancers, announced today that the ... and the Company welcomes Neil Woodford,s call ... anonymous internet report on NW Bio.  The Company,s Board ... Powers stated, "We agree with Mr. Woodford that, ...
(Date:11/27/2015)... ... November 27, 2015 , ... Pittcon is pleased to ... presentations offered in symposia, oral sessions, workshops, awards, and posters. The core ... of applications such as, but not limited to, biotechnology, biomedical, drug discovery, environmental, ...
(Date:11/25/2015)... 2015  PharmAthene, Inc. (NYSE MKT: PIP) announced  today ... rights plan (Rights Plan) in an effort to preserve ... under Section 382 of the Internal Revenue Code (Code). ... use of its NOLs could be substantially limited if ... Section 382 of the Code. In general, an ownership ...
Breaking Biology Technology: