Navigation Links
Pure nanotube-type growth edges toward the possible
Date:12/6/2010

New research at Rice University could ultimately show scientists the way to make batches of nanotubes of a single type.

A paper in the online journal Physical Review Letters unveils an elegant formula by Rice University physicist Boris Yakobson and his colleagues that defines the energy of a piece of graphene cut at any angle.

Yakobson, a professor in mechanical engineering and materials science and of chemistry, said this alone is significant because the way graphene handles energy depends upon the angle -- or chirality -- of its edge, and solving that process for odd angles has been extremely challenging. But, he wrote, the research has "profound implications in the context of nanotube growth, offering rational ways to control their chiral symmetry, a tantalizing yet so far elusive goal."

Graphene is the single-atom-thick form of carbon that has become of tremendous interest for its potential to revolutionize electronics, optics, sensing and mechanical devices. Getting a handle on how this chicken-wire-shaped sheet of carbon atoms transports electricity has been the focus of intense study.

A sheet of graphene with zigzag or armchair edges squares up nicely. Zigzags are metallic, armchairs are semiconductors, and their atoms march in rank, evenly spaced, along the edges. A full 30 degrees of rotation separates one from the other.

But if the hexagons that make up a sheet are offset less than 30 degrees, atoms along a straight edge are unevenly spaced. "That makes analysis of the energy very complicated, because it's a large irregular structure. It's like noise," Yakobson said. "We've found a way to calculate the energies in these arbitrary angles," he said.

Yakobson and his co-authors, Yuanyue Liu, a graduate student in his lab, and Alex Dobrinsky, a former graduate student and now a postdoctoral researcher at Brown University, soon wondered how these findings applied to carbon nanotubes.

"T
'/>"/>

Contact: David Ruth
druth@rice.edu
713-348-6327
Rice University
Source:Eurekalert

Page: 1 2 3

Related biology technology :

1. Verenium Corporation to Present at Canaccord Adams 28th Annual Global Growth Conference
2. SENOMYX TO WEBCAST CORPORATE PRESENTATION AT THE CANACCORD ADAMS 28TH ANNUAL GLOBAL GROWTH CONFERENCE
3. Bionovo to Present at Canaccord Adams Global Growth Conference
4. Pharmasset to Present at the Canaccord Adams Global Growth Conference on Tuesday, August 12th
5. KJT Group Positions for Substantial Growth
6. Emerging Growth Equities, Ltd. Initiates Coverage of CombiMatrix Corporation with a BUY Rating and an $18.00 Price Target
7. Abaxis, Inc. to Present at the Sidoti & Companys Seventh Annual West Coast Emerging Growth Institutional Investor Forum
8. Filter Markets - Discover the Growth Segments
9. Long-Term Investments Remain Critical to Biotechnology Industry Growth, According to a New Report by Global Industry Analysts
10. Althea Technologies Secures $12 M Credit Line to Continue Facility Growth and Expansion
11. Tengion Scientists Publish Positive Preclinical Findings With Neo-Organ Demonstrating Long-term Durability and Growth With Skeletal Maturation
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/27/2014)... 27, 2014 Ryan Carfley , Managing ... to sit down with Bryan Hamilton, the publisher of the ... discuss talent in the Research Triangle region of North Carolina. ... highlighted at the roundtable include the role of social ... of work/life balance and the unique role that Millennials play ...
(Date:10/27/2014)... -- The Italian company Roadrunnerfoot has ... its artificial "lower limb", after the German giant ...      (Photo: http://photos.prnewswire.com/prnh/20141027/713097 ) , ... judgement has arrived: Roadrunnerfoot, the small Italian company ... prostheses with composite materials, has won against global ...
(Date:10/27/2014)... , Oct. 27, 2014 Kalorama Information says ... Ebola concern in the United States ... The healthcare market researcher said the FDA,s Emergency Use Authorization ... diagnostic tests for the detection of the Ebola virus ... useful.  Kalorama routinely assess the IVD industry and its ...
(Date:10/27/2014)... MA (PRWEB) October 27, 2014 ... profit. SoundConnect , an industry leading unified ... its partners and agents to deliver cloud-based audio ... accelerate growth opportunities. , With SoundConnect’s Q4 ... every twenty-five video and/or web conferencing licenses sold, ...
Breaking Biology Technology:Personify's Ryan Carfley Talks Recruiting with Triangle Business Journal, RPG Solutions 2Personify's Ryan Carfley Talks Recruiting with Triangle Business Journal, RPG Solutions 3Italian Lower Limb Prosthesis Company Wins Lawsuit Against German Giant Ottobock 2Kalorama: PCR The Go-to Test in Ebola Fight 2Kalorama: PCR The Go-to Test in Ebola Fight 3SoundConnect Unveils Q4 Partner Incentives 2
... 2011 NewCardio, Inc., (OTC BB: NWCI) a cardiovascular ... Clinilabs, will utilize QTinno®, NewCardio,s automated cardiac safety solution, ... new drug under development for a central nervous system ... one important aspect of the trial. Clinilabs, ...
... a biotechnology company developing peptide therapeutics for metabolic diseases, ... as Chief Executive Officer. Dr. Gottesdiener joins Rhythm from ... President and Late-Stage Therapeutic Group Leader, with responsibility for ... and previously as head of early-stage clinical development programs. ...
... -- an open-source, web-based platform for data-intensive biomedical ... a "cloud computing" resource. A team of researchers ... and molecular biology at Penn State University; Kateryna ... State; and James Taylor from Emory University, developed ...
Cached Biology Technology:Clinilabs will Conduct Phase 1 Trial Using QTinno® 2Clinilabs will Conduct Phase 1 Trial Using QTinno® 3Clinilabs will Conduct Phase 1 Trial Using QTinno® 4Clinilabs will Conduct Phase 1 Trial Using QTinno® 5Rhythm Names Keith M. Gottesdiener Chief Executive Officer 2Galaxy DNA-analysis software is now available 'in the cloud' 2Galaxy DNA-analysis software is now available 'in the cloud' 3
(Date:10/29/2014)... York City on September 19, 2014, leading geneticist and ... of Genome Sciences and Medicine at the University of ... of Tel Aviv University, was awarded the 2014 Lasker-Koshland ... to her honorary degree from TAU, Prof. King was ... Medicine, and for the past 18 years she has ...
(Date:10/29/2014)... Cambridge, MA and Hebei, China — BGI Tech and ... sequencing of the Jujube genome. Jujube is the most ... Jujube genome is particularly difficult to sequence due the ... is the first time that a genome in the ... been recently published in Nature Communications ...
(Date:10/28/2014)... One of the tragic realities of cancer is ... highly toxic and their effectiveness varies unpredictably from ... is poised to change this reality by rapidly ... on an individual,s cancer before chemotherapy begins. , ... headed by Assistant Professor Melissa Skala has developed ...
Breaking Biology News(10 mins):Geneticist and humanitarian: Prof. Mary-Claire King receives Lasker Award 2BGI Tech and Hebei Agricultural University complete the genome sequencing of the jujube tree 2Improving breast cancer chemo by testing patient's tumors in a dish 2Improving breast cancer chemo by testing patient's tumors in a dish 3
... of the embryo in the uterus have found a ... vessels that sustain the embryo. Without this protein, which is ... embryo is unlikely to survive. This is the first ... estrogen spurs cell differentiation and blood-vessel growth in the uterus ...
... techniques are increasing hope of restoring fertility for women ... destruction of reproductive tissue. The same techniques can also ... protect against extinction of endangered animal species by maintaining ... can used to produce offspring at some point in ...
... percent of fish species in North American streams, rivers ... most detailed evaluation of the conservation status of freshwater ... 700 fishes now listed represent a staggering 92 percent ... previous 1989 study published by the American Fisheries Society. ...
Cached Biology News:Gap junction protein vital to successful pregnancy, researchers find 2Cryopreservation techniques bring hopes for women cancer victims and endangered species 2Silent streams? Escalating endangerment for North American freshwater fish 2Silent streams? Escalating endangerment for North American freshwater fish 3