Navigation Links
Video shows nanotube spins as it grows
Date:7/27/2009

HOUSTON -- (July 27, 2009) -- New video showing the atom-by-atom growth of carbon nanotubes reveals they rotate as they grow, much like the halting motion of a mechanical clock's second hand. Published online this month by researchers at France's Universit Lyon1/CNRS and Houston's Rice University, the research provides the first experimental evidence of how individual carbon atoms are added to growing nanotubes.

"The key issue for realizing the potential of carbon nanotubes has always been better control of their growth," said team lead Stephen Purcell of the Universit Lyon1/CNRS. "Our findings offer new insights for better measurement, modeling and control of nanotube growth."

Carbon nanotubes are long, hollow cylinders of pure carbon. They are hair-like in shape but are about 100,000 times smaller than human hair. They are also about six times stronger than steel, conduct electricity as well as copper and are almost impervious to radiation and chemical destruction. As a result, scientists are keen to use them in superstrong, "smart" materials, but they need to better understand how to produce them.

"The images from Dr. Purcell's lab show the atom-by-atom 'self assembly' of a nanotube," said Rice co-author Boris Yakobson, professor in mechanical engineering and materials science and of chemistry. "The video offers compelling evidence of the rotational motion that accompanies nanotube growth. It brings to mind Galileo's famous quote, 'And yet, it does turn.'"

In February, Yakobson offered a new theory suggesting that nanotubes grow like tiny, woven tapestries, with new atoms attaching to twisting atomic threads. The new video appears to support the theory, indicating that atoms are added in pairs as the tube spins and grows.

To create the images, Purcell's team at LPMCN (Laboratoire de Physique de la Matire Condense et Nanostructures) used a field emission microscope (FEM). A few atoms of metal catalyst were placed on the tip of the FEM's needle-like probe, and carbon nanotubes grew atop the metal catalyst. An electric current was passed lengthwise through the probe and nanotube, and it projected a bright, top-down image of the nanotube onto a phosphor screen. The bright spot was filmed by a video camera, which revealed the nanotube's rotation during growth.

In one case, a nanotube turned approximately 180 times during its 11-minute growth. A frame-by-frame analysis of the video showed that the rotation proceeded in discrete steps -- much like the halting motion of the second hand on a mechanical clock -- with about 24 steps per rotation.

"The results support our predictions of how nanotubes grow," Yakobson said. "The video shows rotational movement during growth, as carbon atoms are added in pairs to the twisting, chiral network of carbon atoms that comprise the nanotube."


'/>"/>

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

Related biology technology :

1. MultiVu Video Feed: Allergan, Inc. Partners With "Project Runway" Designer Kara Saun and Gen Art Fresh Faces In Fashion to Raise Awareness About Excessive Underarm Sweating
2. MultiVu Video Feed: Hard Rocks 2007 Ambassadors of Rock Tour Is "On the Road Again" With Music Legend Willie Nelson
3. Video: Trinity Mother Frances Neurosurgeon Using New Disc System for Patients With Degenerative Diseases of the Neck
4. Video: New Survey Finds Technology Plays a Critical Role in Lives of People with Multiple Sclerosis, Yet Many Are Not Using it to Overcome Disease-Related Challenges
5. Video shows buckyballs form by shrink wrapping
6. Video and Photo: EMD Serono Launches easypod(R), New Electronic Growth Hormone Injection Device
7. MultiVu Video Feed: Easypod(R), Award-Winning Electronic Device
8. Video and Photo: Tekturna HCT(R), a Single-tablet Combination of Tekturna(R)* and a Diuretic, Receives US Approval for Treatment of High Blood Pressure
9. Kiwa Posts Video of 2007 Annual Management Meetings
10. MultiVu Video Feed: Johnson & Johnson Diabetes Institute, LLC Launches New Training Center to Improve Community-Based Diabetes Care
11. Dancing With the Stars Drew Lachey and Novo Nordisk Launch Dancin to Change Diabetes National Video Contest
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Video shows nanotube spins as it grows
(Date:12/6/2016)... ... 06, 2016 , ... Discovering new clues to natural treatments that could allow ... in our brains. And searching for keys to our immune systems by studying parasite-resistant ... the 2017 Edith and Peter O’Donnell Awards by The Academy of ...
(Date:12/6/2016)... ... December 06, 2016 , ... Clinical ... it has acquired the assets of Theorem Clinical Research - Clinical Supplies ... clinical trial drug packaging, labeling, storage, reconciliation, and distribution for pharmaceutical trials ...
(Date:12/6/2016)... 2016 Zimmer Biomet Holdings, Inc. (NYSE ... pricing terms of its previously-announced cash tender offers ... price (excluding accrued and unpaid interest to, but ... fees and expenses related to the Offers) (the ... in the table below (collectively, the "Notes"). The ...
(Date:12/6/2016)... ... December 06, 2016 , ... ... on discovery and development of precision treatments for neurodegenerative diseases, today announced ... disease (AD) inhibited the direct neurotoxic effect of prion-like forms of Amyloid ...
Breaking Biology Technology:
(Date:11/30/2016)... , Nov. 30, 2016 Not many of us realize that we spend ... recovery so we need to do it well. Inadequate sleep levels have been found ... pressure, stroke, diabetes, and even cancer. Maybe now is the best time ... could help them to manage their sleep quality? Continue ... ...
(Date:11/29/2016)... VILNIUS, Lithuania , Nov. 29, 2016 ... high-precision biometric identification and object recognition technologies, ... kit (SDK) for fingerprint recognition solutions that ... extract a fingerprint template using less than ... used in compact devices that have limited ...
(Date:11/24/2016)... , Nov. 23, 2016 Cercacor today introduced ... and their trainers non-invasively measure hemoglobin, Oxygen ... Rate, and Respiration Rate in approximately 30 seconds. Smaller ... easy and immediate access to key data about their ... a training regimen. Hemoglobin carries oxygen ...
Breaking Biology News(10 mins):