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:5/26/2015)... Kalifornien und HILDEN, Deutschland, May 26, 2015 ... Insight ®   ermöglicht ... die Erstellung dazugehöriger Berichte; Vorstellung auf den ... QIAGEN N.V. (NASDAQ: QGEN ; ... Markteinführung von QIAGEN Clinical Insight ® ...
(Date:5/26/2015)... RICHMOND, Calif. , May 26, 2015  Sangamo BioSciences, ... Lanphier , Sangamo,s president and CEO, will provide an update ... programs and an overview of the company,s business strategy at ... 2015 Global Healthcare Conference. The conference is being held in ... presentation will be webcast live and may be accessed via ...
(Date:5/26/2015)... May 26, 2015  Alere Inc. (NYSE: ALR ) ... failure to timely file its Quarterly Report on Form 10-Q ... 10-Q"), it has received a notice from the New York ... compliance with the NYSE,s continued listing requirements under the timely ... Company Manual. The reason for the delay ...
(Date:5/26/2015)... 26, 2015 Global Stem Cells ... plans for the company’s first cellular and regenerative medicine ... a full day, hands-on stem cell training class Oct. ... Garcia Gimenez, M.D., President of Therapeutic Confrontations (CONFTERA) in ... increasing interest in regenerative medicine and recent advances in ...
Breaking Biology Technology:QIAGEN bringt klinische Bioinformatik-Plattform für Next Generation Sequencing-Anwendungen auf den Markt 2QIAGEN bringt klinische Bioinformatik-Plattform für Next Generation Sequencing-Anwendungen auf den Markt 3QIAGEN bringt klinische Bioinformatik-Plattform für Next Generation Sequencing-Anwendungen auf den Markt 4QIAGEN bringt klinische Bioinformatik-Plattform für Next Generation Sequencing-Anwendungen auf den Markt 5QIAGEN bringt klinische Bioinformatik-Plattform für Next Generation Sequencing-Anwendungen auf den Markt 6Sangamo BioSciences Announces Presentation At The Jefferies 2015 Global Healthcare Conference 2Stem Cell Training, Inc. Announces First European Symposium on Cellular and Regenerative Medicine 2Stem Cell Training, Inc. Announces First European Symposium on Cellular and Regenerative Medicine 3
... members help guide non-profit on path to cure ... Project, a Minnesota,non-profit organization created to expedite the ... attracted two well-known experts to its,Board of Directors: ... (Logo: http://www.newscom.com/cgi-bin/prnh/20071214/CLF057LOGO-b ), Steven D. ...
... 16 Celator Pharmaceuticals today,announced that John Bennett, ... the BIO Business Forum during the Biotechnology Industry,Organization ... will,provide a corporate overview and an update on ... on Wednesday, June 18,2008 at 3:30 PDT in ...
... NovaVision today announced,the appointment of Rudy Mazzocchi as ... is responsible for leveraging the company,s novel,technology to ... patients with,impaired vision have access to NovaVision(R) Vision ... expertise bringing new medical technologies,and devices to market ...
Cached Biology Technology:Spring Point Project Names New Members to Board of Directors 2NovaVision Appoints Medical Technology Veteran Rudy Mazzocchi as Chief Executive Officer 2NovaVision Appoints Medical Technology Veteran Rudy Mazzocchi as Chief Executive Officer 3
(Date:5/14/2015)... YORK , May 14, 2015 /PRNewswire/ ... in identity verification and online remote proctoring, ... a software-as-a-service (SaaS) company and creator of ... customers of the two companies will benefit ... in Canvas. As a fully ...
(Date:5/11/2015)... 11, 2015 Curemark LLC, a privately held ... a new Phase III double blind, randomized, placebo-controlled clinical ... CM-AT, on all children ages 3-8 with Autism. Previously, ... III double blinded clinical trial for CM-AT in children ... the digestive enzyme chymotrypsin. This new trial will help ...
(Date:5/7/2015)... Sweden , May 7, 2015 ... touch fingerprint sensors, FPC1022 and FPC1035, FPC,s smallest ... and FPC1035 are mainly considered for integration on ... size gives smartphone OEMs increased possibilities to integrate ... The decreased size also improves possibilities for module ...
Breaking Biology News(10 mins):Verificient and Instructure Announce Alliance Partnership to Provide Online Proctoring for K-12 and Higher Education Institutions 2Curemark, LLC, Launches New Phase III Trial in Expanded Population of Children with Autism 2FPC Introduces its Smallest Touch Fingerprint Sensors to Date 2
... rates are concentrated in the northern part of the ... according to a report in Cancer Epidemiology, Biomarkers ... for Cancer Research. Ahmedin Jemal, D.V.M., Ph.D., vice ... said the decrease in death rates ranged from about ...
... global cooling and warming over the past few million ... they do today, according to a new study by ... The researchers, who analyzed California gray whale ( Eschrichtius ... 120,000 years, also found evidence to support the idea ...
... Move over, boy bands of Americathere,s a new ... Middle School in San Diego, California, entered The Christopher ... (STEM) program that challenges middle-school students to identify a ... Taking a cue from the popular group the Backstreet ...
Cached Biology News:Southern US states lag in reducing death rates from colorectal cancer 2Gray whales likely survived the Ice Ages by changing their diets 2Gray whales likely survived the Ice Ages by changing their diets 3Gray whales likely survived the Ice Ages by changing their diets 4Gray whales likely survived the Ice Ages by changing their diets 5Middle-school students educate community on proper computer posture 2
Extra Large bottle for hybridization 300 x 70mm...
Request Info...
... is TWO ROTORS in ONE! Now, you ... can spin both 1.5 - 2.0 ml ... design provides excellent chemical resistance and can ... fully compatible with common decontamination methods, including ...
... compatible with hood installations. ... system for 384-well plates, ... prepares large quantities of ... Wellpro also performs plate ...
Biology Products: