Navigation Links
Carbyne morphs when stretched
Date:7/21/2014

Applying just the right amount of tension to a chain of carbon atoms can turn it from a metallic conductor to an insulator, according to Rice University scientists.

Stretching the material known as carbyne -- a hard-to-make, one-dimensional chain of carbon atoms -- by just 3 percent can begin to change its properties in ways that engineers might find useful for mechanically activated nanoscale electronics and optics.

The finding by Rice theoretical physicist Boris Yakobson and his colleagues appears in the American Chemical Society journal Nano Letters.

Until recently, carbyne has existed mostly in theory, though experimentalists have made some headway in creating small samples of the finicky material. The carbon chain would theoretically be the strongest material ever, if only someone could make it reliably.

The first-principle calculations by Yakobson and his co-authors, Rice postdoctoral researcher Vasilii Artyukhov and graduate student Mingjie Liu, show that stretching carbon chains activates the transition from conductor to insulator by widening the material's band gap. Band gaps, which free electrons must overcome to complete a circuit, give materials the semiconducting properties that make modern electronics possible.

In their previous work on carbyne, the researchers believed they saw hints of the transition, but they had to dig deeper to find that stretching would effectively turn the material into a switch.

Each carbon atom has four electrons available to form covalent bonds. In their relaxed state, the atoms in a carbyne chain would be more or less evenly spaced, with two bonds between them. But the atoms are never static, due to natural quantum uncertainty, which Yakobson said keeps them from slipping into a less-stable Peierls distortion.

"Peierls said one-dimensional metals are unstable and must become semiconductors or insulators," Yakobson said. "But it's not that simple,
'/>"/>

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

Page: 1 2 3

Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Carbyne morphs when stretched
(Date:12/24/2014)...  United Therapeutics Corporation (NASDAQ: UTHR ) announced ... has submitted a pre-market approval application to the U.S. ... Medtronic,s SynchroMed ® II implantable drug infusion system ... Therapeutics, Remodulin ® (treprostinil) Injection delivered intravenously to ...
(Date:12/24/2014)...  Vermillion, Inc. (Nasdaq:   VRML), a bio-analytical solutions ... the Company closed its previously announced private placement ... W. Schuler , Birchview Fund LLC and several ... offering expenses.  The proceeds will be used for ...
(Date:12/24/2014)... “Preparative & Process Chromatography Market by Instrument (Liquid ... Valves, Guages, Seals), Accessories, Services, End User (Biotechnology, ... provides a detailed overview of the major drivers, ... impacting the preparative and process chromatography market along ...
(Date:12/24/2014)... December 23, 2014 Earlier this year in ... director of the Adult Stem Cell Technology Center, LLC ( ... appreciated unique property of adult tissue stem cells. His ... Past, Important for the Future,” embodied the essence of his ...
Breaking Biology Technology:United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 2United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 3United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 4Vermillion Announces Closing of Equity Financing 2Vermillion Announces Closing of Equity Financing 3Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 2Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 3Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 4Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 2Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 3Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 4
... Novel system is the first to use rapid, automated DNA ... ... Inc., a leader in the,development of state of the art ... the United States Patent,and Trademark Office (USPTO) recently issued U.S. ...
... Expression Genetics, Inc.,(EGEN) announced today that ... selected as one of the Top 10 ... strategic partnering. The selection was made by,an ... leading,provider of business information products and services ...
... Bio-,Pharmaceutical Technology, Inc (OTC Bulletin Board: HFGB) (the ... and pharmaceutical raw,materials for use in pharmaceutical, nutraceutical ... announce a Letter of Intent to enter into ... ("Qinba").,Under the proposed terms of this arrangement, Huifeng ...
Cached Biology Technology:eGenomics Awarded First U.S. Patent Covering Rapid DNA Sequencing Technology Platform to Control Hospital-Acquired Infections 2eGenomics Awarded First U.S. Patent Covering Rapid DNA Sequencing Technology Platform to Control Hospital-Acquired Infections 3Expression Genetics' EGEN-001 Named One of 10 Most Promising Oncology Products by Windhover 2Expression Genetics' EGEN-001 Named One of 10 Most Promising Oncology Products by Windhover 3Huifeng Bio-Pharmaceutical (HFGB) Enters into Letter of Intent with Xi'an Qinba Xintong Medical Ltd. 2
(Date:12/24/2014)... NEW YORK , Dec. 23, 2014  Since its launch in ... of people to eliminate the pain of trying to remember ... their own biometrics fused to their smartphones. To assist people ... Labs , the company that created 1U and focuses on ...
(Date:12/22/2014)...  The 2014 Holiday Season may be the brightest ever ... that the long anticipated floodgates for consumer biometrics may ... smart phones, tablets, and wearable mobile devices that incorporate ... users with nearly 4.8 billion biometric devices by 2020.   ...
(Date:12/19/2014)... Dec. 18, 2014  23andMe, Inc., the leading personal genetics company, ... differences in genetic ancestry of individuals from across ... arrived more than four hundred years ago, the ... for peoples from different continents. This study illuminates how American ...
Breaking Biology News(10 mins):1U Offers Best Solution to the Username / Password Dilemma: For FREE! 21U Offers Best Solution to the Username / Password Dilemma: For FREE! 3First Season of Holiday Shopping with Mobile Biometric Payments Wraps Up With a Present for Biometrics Industry: A Rosy Forecast for More Than 2 Billion Users of 4.8 Billion Mobile Biometric Devices by 2020 223andMe Study Sketches Genetic Portrait of the United States 223andMe Study Sketches Genetic Portrait of the United States 323andMe Study Sketches Genetic Portrait of the United States 4
... Institute of Marine Science continue to monitor the algal blooms ... few weeks. These "red tides" occur in the lower Bay ... area than in years past, likely due to last winter,s ... by dense blooms of tiny marine plants called algae that ...
... , PROVIDENCE, R.I. [Brown University] Policymakers struggling to ... questions on the scale of millions of people and ... the impact of many potential interventions, alone or in ... 2012 International AIDS Society Conference in Washington, D.C., Brandon ...
... Ethical Treatment of Animals (PETA) Foundation UK has submitted ... the European Chemicals Agency (ECHA) is failing to fulfil ... which animal testing could be avoided under the rules ... in EU institutions and agencies, and PETA maintains that ...
Cached Biology News:Researchers monitor 'red tides' in Chesapeake Bay 2Computers can predict effects of HIV policies 2Computers can predict effects of HIV policies 3PETA files complaint with European ombudsman over animal testing for REACH 2
... Caspase-9 Pan-Caspase In Situ Assay Kit, Fluorescein ... active caspases in cells undergoing apoptosis. The ... for use in diagnostic or therapeutic procedures. ... use a novel approach to detect active ...
... silencing experiments often call for critical, ... Transfection Agent refines siRNA transfection protocols ... lipid-based formulation can be used to ... are subcultured without increased cytotoxicity. ...
... as well as other yeasts, has become ... laboratories. The ability to transform whole cells ... DNAs using lithium based buffers and polyethylene ... library screening easy and reliable, especially when ...
...
Biology Products: