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:3/26/2015)... March 26, 2015 PAREXEL International ... clinical research organization , announced today ... agreement to acquire all of the business ... leading provider of specialized pharmacovigilance services, based ... collection, detection, assessment, monitoring, and prevention of ...
(Date:3/26/2015)... 26, 2015 Ale Gicqueau, Founder and ... of Clinical Affairs at Align Technology, on “ Conducting ... upcoming ACRP 2015 Global Conference and Exhibition on April ... , During the poster presentation, Ale Gicqueau and ... running a Postmarket Registry, the requirements and resources to ...
(Date:3/25/2015)... MN (PRWEB) March 26, 2015 Agnition ... upcoming episode of American Farmer, airing for the first ... The segment of American Farmer will explore the extremely ... provides crop producers with a patented Microbial Catalyst™ technology ... and greater yields. The segment will air again on ...
(Date:3/25/2015)... 25, 2015 The surging prevalence ... have fuelled social media growth, with over 50% ... in social networking. Insurance companies are making use ... clients and promote a diversity of their services ... increasingly exploiting social networking services as part of ...
Breaking Biology Technology:PAREXEL Announces Execution of Definitive Agreement to Acquire Quantum Solutions India, Strengthening Leadership In Pharmacovigilance Services 2PAREXEL Announces Execution of Definitive Agreement to Acquire Quantum Solutions India, Strengthening Leadership In Pharmacovigilance Services 3PAREXEL Announces Execution of Definitive Agreement to Acquire Quantum Solutions India, Strengthening Leadership In Pharmacovigilance Services 4Clinovo Presents at ACRP 2015 in Salt Lake City, Utah on April 25th-28th 2Clinovo Presents at ACRP 2015 in Salt Lake City, Utah on April 25th-28th 3Agnition to be Featured In Upcoming Episode of American Farmer on RFD-TV 2Social Media Role in Global Insurance Industry Examined by Timetric in New Market Research Report Published at MarketPublishers.com 2Social Media Role in Global Insurance Industry Examined by Timetric in New Market Research Report Published at MarketPublishers.com 3
... wholly owned subsidiary of British company Innovative Carbon Limited today ... 10th April to 13th. , Graphene, a sheet of carbon ... wonder material. First isolated at Manchester University in 2004, ... race has been on to produce it commercially. To ...
... April 6, 2012 Arteriocyte, a leading biotechnology ... Massachusetts announced today approval from the Food and ... clinical trial using its Magellan MAR01™ technology in ... Device Exemption (IDE 15013) allows Arteriocyte and its ...
... 2012  GenVec, Inc. (NASDAQ:   GNVC) announced publication ... vectors circumvent neutralizing antibodies in order to generate ... published online in PloS ONE, and can be ... "Modification of Ad5 Hexon Hypervariable Regions Circumvents Pre-existing ...
Cached Biology Technology:UK company to demonstrate their commercially effective graphene production process 2Arteriocyte Receives FDA Approval to Initiate Compartment Syndrome Trial for Amputation Prevention Focused on Wounded Warriors 2Arteriocyte Receives FDA Approval to Initiate Compartment Syndrome Trial for Amputation Prevention Focused on Wounded Warriors 3GenVec Announces Research on Improved Vaccine Vectors 2GenVec Announces Research on Improved Vaccine Vectors 3
(Date:3/10/2015)... , March 10, 2015 Transforming ... "Personalized Medicine in Human Space Flight" ... Thomas J. Goodwin , Ph.D. was recently featured by ... past two years. Specifically, "Personalized Medicine in ... scientific papers published in 2013 and 2014 from Springer ...
(Date:3/4/2015)... 2015 Research and Markets ( ... "Global Biometrics Market Forecast and Opportunities, 2020" ... market for biometric authentication systems is projected to ... 2020 The driving forces for this ... government projects and constant development in technology. In ...
(Date:3/2/2015)... Lithuania , March 2, 2015   Neurotechnology ... technologies, today introduced the SentiGaze Software Development Kit ... to create applications that use off-the-shelf webcams to track ... user gazes at a monitor. Heatmaps can be used ... the effectiveness of online advertising. The SDK can also ...
Breaking Biology News(10 mins):"Personalized Medicine in Human Space Flight" Listed Among Most Influential Papers of 2013 and 2014 2Global Biometrics Market Forecast and Opportunities, 2020 2Global Biometrics Market Forecast and Opportunities, 2020 3Neurotechnology Releases SentiGaze SDK for Eye Movement Tracking Using Ordinary Webcams 2Neurotechnology Releases SentiGaze SDK for Eye Movement Tracking Using Ordinary Webcams 3
... In evaluating the bioactive compounds of Illinois blueberry ... compounds that inhibit enzymes responsible for carbohydrate absorption and ... help people with diabetes decrease their blood sugar. ... that would optimize the inhibition of the alpha-amylase and ...
... Philadelphia, PA, August 20, 2012 The more that ... The same can be said about the genetics and ... disease, mutation of a single gene predictably produces a ... to Mendelian disorders, understanding bipolar disorder has been extremely ...
... Hillel was named the 2012 recipient of the World ... have advanced human development by improving the quality, quantity, ... Hillela more than 50-year member of the Soil Science ... the 2012 International Annual Meetings of the American Society ...
Cached Biology News:Drink made from berry wine may provide tasty drug for diabetes 2Making sense out of the biological matrix of bipolar disorder 2World Food Prize winner among speakers at agronomy, crop and soil science societies meetings 2World Food Prize winner among speakers at agronomy, crop and soil science societies meetings 3
... The mycobacteria in Complete Freund's adjuvant ... injection site which enhances the immuneresponse. For ... used for the initial injections; Incomplete Freund's ... Antigens (preferably in saline) are typically mixed ...
2,4-Dinitrophenyl hapten is conjugated to Human Serum Albumin (HSA) protein through lysine....
Alexa Fluor 350/488/594 Filter Set (Semrock Brightline) *mounted* *Zeiss Axio AF...
...
Biology Products: