Navigation Links
Nanotube's 'tapestry' controls its growth
Date:2/5/2009

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
jadeboyd@rice.edu
713-348-6778
Rice University
Source:Eurekalert  

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:
*Name:
*Comment:
*Email:
Related Image:
Nanotube's 'tapestry' controls its growth
(Date:5/20/2016)...  VoiceIt is excited to announce its new ... By working together, VoiceIt and VoicePass will offer ... take slightly different approaches to voice biometrics, collaboration ... usability. Both ... "This marketing and technology partnership allows ...
(Date:5/9/2016)... , UAE, May 9, 2016 ... it comes to expanding freedom for high net worth ... Even in today,s globally connected world, there is still ... system could ever duplicate sealing your deal with a ... second passports by taking advantage of citizenship via investment ...
(Date:4/28/2016)... , April 28, 2016 First quarter ... (139.9), up 966% compared with the first quarter of 2015 ... totaled SEK 589.1 M (loss: 18.8) and the operating margin was ... (loss: 0.32) Cash flow from operations was SEK 249.9 ... 2016 revenue guidance is unchanged, SEK 7,000-8,500 M. The ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... ... 2016 , ... Charm Sciences, Inc. is pleased to announce ... Research Institute approval 061601. , “This is another AOAC-RI approval of the Peel ... President of Regulatory and Industrial Affairs. “The Peel Plate methods perform comparably to ...
(Date:6/23/2016)... ON (PRWEB) , ... June 23, 2016 , ... STACS ... DNA Technical Leader at the Arkansas State Crime Laboratory, has joined STACS DNA as ... the STACS DNA team,” said Jocelyn Tremblay, President and COO of STACS DNA. “In ...
(Date:6/23/2016)... On Wednesday, June 22, 2016, the NASDAQ Composite ... Jones Industrial Average edged 0.27% lower to finish at 17,780.83; ... has initiated coverage on the following equities: Infinity Pharmaceuticals Inc. ... NKTR ), Aralez Pharmaceuticals Inc. (NASDAQ: ARLZ ), ... more about these stocks by accessing their free trade alerts ...
(Date:6/23/2016)... , June 23, 2016 ... market research report to its pharmaceuticals section with ... product details and much more. Complete ... across 151 pages, profiling 15 companies and supported ... at http://www.reportsnreports.com/reports/601420-global-cell-culture-media-industry-2016-market-research-report.html . The ...
Breaking Biology Technology: