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:9/20/2017)... ... ... From industry leaders, sports stars, and Hollywood icons to thousands of everyday, ... had lost all hope. Their stories are told here. , Chapter 13: ... “Neil takes readers on a riveting journey through the past, present and future of ...
(Date:9/19/2017)... ... September 19, 2017 , ... ... of funded early-stage tech companies. “Grit” author Angela Duckworth and her team at ... ic@3401 community is Cooley, an international law firm with decades of experience supporting ...
(Date:9/19/2017)... MI (PRWEB) , ... September 19, 2017 , ... ... laboratory, is pleased to announce the recipients of its 2017 Science Student Award. ... exceptional leadership qualities, and involvement with community service defray the costs of obtaining ...
(Date:9/18/2017)... BELLINGHAM, Washington, USA, and CARDIFF, UK (PRWEB) , ... ... ... international society for optics and photonics, has announced the move of the SPIE ... enhanced website. , Developed internally by SPIE to create an improved user experience ...
Breaking Biology Technology:
(Date:3/30/2017)... YORK , March 30, 2017 Trends, ... type (physiological and behavioral), by technology (fingerprint, AFIS, iris ... voice recognition, and others), by end use industry (government ... and immigration, financial and banking, and others), and by ... Europe , Asia Pacific , ...
(Date:3/24/2017)... MILAN , March 24, 2017 The Controller ... Deputy Controller Mr. Abdulla Algeen have received the prestigious international ... Continue Reading ... ... small picture) and Deputy Controller Abdulla Algeen (small picture on the right) ...
(Date:3/22/2017)... Lithuania , March 21, 2017   ... and object recognition technologies, today announced the release ... kit (SDK), which provides improved facial recognition using ... cameras on a single computer. The new version ... to improve accuracy, and it utilizes a Graphing ...
Breaking Biology News(10 mins):