Navigation Links
Tiny wires change behavior at nanoscale
Date:8/29/2011

id. "In this case, we call it brittle-like, which means it has significantly reduced ductility. There's still some, but the fracture behavior is different from regular necking."

Their experiments on 22 gold wires of less than 20 nanometers involved the delicate operation of clamping them to a transmission electron microscope/atomic force microscope sample holder and then pulling them at constant loading speeds. Twins appeared under the shear component of the stress, which forced atoms to shift at the location of surface defects and led to a kind of nanoscale tectonic fault across the wire.

"Once you have those kinds of damage-initiation sites formed in the nanowire, you will have a lot less ductility. The metal will fracture prematurely," Lou said. "We didn't expect such twin-boundary formations would have such profound effects."

With current technology, it's nearly impossible to align the grip points on either side of the wire, so shear force on the nanowires was inevitable. "But this kind of loading mode will inevitably be encountered in the real world," he said. "We cannot imagine all the nanowires in an application will be stressed in a perfectly uniaxial way."

Lou said the results are important to manufacturers thinking of using gold as a nanomechanical element. "Realistically, you could have some off-axis angle of stress, and if these twins form, you would have less ductility than you would expect. Then the design criteria would have to change.

"That's basically the central message of this paper: Don't be fooled by the traditional definition of 'ductile,'" he said. "At the nanoscale, things can happen differently."


'/>"/>

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

Page: 1 2

Related biology technology :

1. Nanowires get into the groove
2. Piezoelectric nanowires allow electrical signals to be produced from mechanical actions
3. With a simple coating, nanowires show a dramatic increase in efficiency and sensitivity
4. Penn research advances understanding of lead selenide nanowires
5. Engineers create vibrant colors in vertical silicon nanowires
6. Novel nanowires boost fuel cell efficiency
7. Biological nanowires expedite future fuel production
8. Major advance in understanding how nanowires form
9. Stretched rubber offers simpler method for assembling nanowires
10. Nanowires exhibit giant piezoelectricity
11. New ultra-clean nanowires have great potential
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/1/2014)... September 30, 2014 Award winning ... announces four new-hosted collaboration bundles that combine ... high quality conferencing experiences for low, flat rate ... choose from, businesses have optimized solutions to meet ... include audio only minutes (1K, 5K, 10K ...
(Date:10/1/2014)... 2014 Industry leaders from ... engage around the theme, ,Commercial Opportunities in the Era ... Elsevier , a world-leading provider of ... host a gathering of some of the industry,s most ... healthcare today and in the future. The ...
(Date:9/30/2014)... , Sept. 30, 2014 Pacific Northwest ... Summary Global Markets Direct,s, ,Pacific Northwest ... provides an overview of the Pacific Northwest Biotechnology, ... report provides comprehensive information on the current therapeutic ... with comparative analysis at various stages, therapeutics assessment ...
(Date:9/30/2014)... Proove Biosciences , the commercial ... announce a new genetic test built upon research from ... Test will provide physicians with an objective way ... levels are stratified between individuals. With this new test, ... has a genetic predisposition that will affect their pain ...
Breaking Biology Technology:SoundConnect Launches New Audio, Web and Video Bundles 2Elsevier Healthcare and Pharmaceutical Economics Conference 2014 To Convene Industry Leaders to Discuss Top Healthcare Business Issues 2Elsevier Healthcare and Pharmaceutical Economics Conference 2014 To Convene Industry Leaders to Discuss Top Healthcare Business Issues 3Pacific Northwest Biotechnology, LLC - Product Pipeline Review - 2014 2Pacific Northwest Biotechnology, LLC - Product Pipeline Review - 2014 3Proove Biosciences is Now Offering the Proove Pain Perception Genetic Test to Help Physicians Assess Patient Pain Tolerance Levels 2Proove Biosciences is Now Offering the Proove Pain Perception Genetic Test to Help Physicians Assess Patient Pain Tolerance Levels 3
... Corn Growers Association reminds U.S. Bt corn growers that the development of ... their planning process. , ... St. Louis, MO (PRWEB) February 20, ... Association (NCGA) reminds U.S. Bt corn growers that the development of ...
... Feb. 20 Mach One Corporation (Pink Sheets: MNCN), ... for positive, long term benefit to the agricultural and ... the acquisition of Modular Process Constructors LLC (MPC).Mach One ... $500,000 of Series B convertible preferred stock at a ...
... February 20 Authentic Natural and Organic,Cosmetic* products ... the NaTrue,Label: the first 100 products have already ... The NaTrue-Label provides orientation for ... criteria for Natural and Organic,Cosmetics. It is international, ...
Cached Biology Technology:Corn Growers Reminded to Follow Refuge Requirements as Spring Planting Nears 2Corn Growers Reminded to Follow Refuge Requirements as Spring Planting Nears 3Mach One Closes on Acquisition of Biopharmaceutical Design & Engineering Firm 2NaTrue-Label: The First 100 Products are Certified 2
(Date:9/30/2014)... What do seedless watermelon, salmon, and strawberries all have ... have two sets of chromosomes and are diploid, these ... more sets of chromosomesseedless watermelon and salmon have 3 ... 10! While this might seem surprising, in fact ... was first discovered over a century ago, but only ...
(Date:9/30/2014)... Calif. The National Institutes of Health (NIH) ... today to develop an electrode array system that ... brain works through unprecedented resolution and scale. , ... to support President Obama,s BRAIN (Brain Research ... research effort to revolutionize our understanding of the ...
(Date:9/30/2014)... scientists and engineers, led by Clemson University associate ... million grant from the U.S. Department of Energy,s ... a direct positive impact on South Carolina in ... radioactive contaminants. , "Understanding the scientific and engineering ... aspects of nuclear technologies is imperative if South ...
Breaking Biology News(10 mins):Gene doubling shapes the world: Instant speciation, biodiversity, and the root of our existence 2Gene doubling shapes the world: Instant speciation, biodiversity, and the root of our existence 3Gene doubling shapes the world: Instant speciation, biodiversity, and the root of our existence 4NIH taps lab to develop sophisticated electrode array system to monitor brain act 2NIH taps lab to develop sophisticated electrode array system to monitor brain act 3Researchers get $5.25 million to advance nuclear technologies in South Carolina 2
... cell biologists there are few better-known proteins than nestin, whose ... "stem cell," such as a neural stem cell. As helpful ... which purpose nestin serves in a cell. In a ... of Nature Neuroscience , Salk Institute of Biological Studies ...
... of California, San Diego School of Medicine provides ... defects associated with a rare childhood neurological disease ... be defective in LND are known to be ... and Parknson,s diseases, suggesting common causes of cognitive ...
... ARBOR, Mich.---DNA, that marvelous, twisty molecule of life, has an ... University of California, Irvine reveals. On rare occasions, its ... into a different shape. "We show that the simple ... of the time---and that this alternative form is functional," said ...
Cached Biology News:Salk researchers discover that stem cell marker regulates synapse formation 2Salk researchers discover that stem cell marker regulates synapse formation 3Genetic clues to compulsive, self-injurious behavior in rare childhood disorder 2Genetic clues to compulsive, self-injurious behavior in rare childhood disorder 3DNA caught rock 'n rollin' 2
... This CLS number ... number, created to easily ... If showing no availability ... the old Sigma-Aldrich number ...
This CLS number is a new product number, created to easily match Cornings product number. If showing no availability yet, please order under the old Sigma-Aldrich number (E6027) or contact customer s...
... pressure gradient system uses three Adept CE ... a flow rate in one microlitre increaments. ... added flexibility. System control and data processing ... interface unit, CE 4900., Column heater/chillers can be ...
... of large numbers of samples may be carried ... minimum operator attention. System control and data ... CE 4900. The elegant, powerful and very ... and Windows 98 and 2000., The supplied detector ...
Biology Products: