. 24/7 Space News .
CARBON WORLDS
Graphene oxide 'paper' changes with strain
by Staff Writers
Houston TX (SPX) Jan 26, 2016


Graphene oxide layers deform evenly under gentle strain, according to experiments and computer models by Rice University researchers. They discovered that the mechanical properties of the material change, depending on the rate of strain. Image courtesy Ajayan Research Group/Rice University. For a larger version of this image please go here.

The same slip-and-stick mechanism that leads to earthquakes is at work on the molecular level in nanoscale materials, where it determines the shear plasticity of the materials, according to scientists at Rice University and the State University of Campinas, Brazil.

The Rice lab of materials scientist Pulickel Ajayan found that random molecules scattered within layers of otherwise pristine graphene affect how the layers interact with each other under strain.

Plasticity is the ability of a material to permanently deform when strained. The Rice researchers, thinking about future things like flexible electronics, decided to see how graphene oxide "paper" would handle shear strain, in which the sheets are pulled by the ends.

Such deep knowledge is important when making novel advanced materials, said Chandra Sekhar Tiwary, a lead author of the new paper in the American Chemical Society journal Nano Letters and a Rice postdoctoral research associate.

"We want to build three-dimensional structures from two-dimensional materials, so this kind of study is useful," he said. "These structures could be a thermal substrate for electronic devices, they could be filters, they could be sensors or they could be biomedical devices. But if we're going to use a material, we need to understand how it behaves."

The graphene oxide paper they tested was a stack of sheets that lay atop each other like pancakes. Oxygen molecules "functionalized" the surfaces, adding roughness to the otherwise atom-thick sheets.

In experiments and computer models, the team found that with gentle, slow stress, the oxides would indeed catch, causing the paper to take on a corrugated form where layers pulled apart. But a higher strain rate makes the material brittle. "The simulation performed by our collaborators in Brazil provides insight and confirms that if you pull it very fast, the layers don't interact, and only one layer comes out," Tiwary said.

"After this study, we now know there are some functional groups that are useful and some that are not. With this understanding we can choose the functional groups to make better structures at the molecular level."


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only


.


Related Links
Rice University
Carbon Worlds - where graphite, diamond, amorphous, fullerenes meet






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

Previous Report
CARBON WORLDS
Cost burden of Quebec's carbon market seen as modest
Montreal, Canada (SPX) Jan 21, 2016
The cost burden of Quebec's carbon-pricing policy, is likely to be modest across income groups and industries, according to a McGill University research team. The policy, which began to be implemented in 2013, provides a model for capping emissions "without undue hardship for the population," the researchers conclude. If anything, they suggest, the program could be more aggressive in seeki ... read more


CARBON WORLDS
Audi joins Google Lunar XPrize competition

Lunar mission moves a step closer

Momentum builds for creation of 'moon villages'

Chang'e-3 landing site named "Guang Han Gong"

CARBON WORLDS
Rover uses Rock Abrasion Tool to grind rocks

Thales Alenia Space to supply reaction control subsystem for ExoMars

Money troubles may delay Europe-Russia Mars mission

Opportunity Welcomes Winter Solstice

CARBON WORLDS
Arab nations eye China, domestic market to revive tourism

Zinnias from space

Newcomer Sierra Nevada to supply ISS alongside SpaceX, Orbital: NASA

NASA's Scott Kelly unveils first flower grown in space: an orange zinnia

CARBON WORLDS
China aims for the Moon with new rockets

China shoots for first landing on far side of the moon

Chinese Long March 3B to launch Belintersat-1 telco sat for Belarus

China Plans More Than 20 Space Launches in 2016

CARBON WORLDS
Japanese astronaut learned Russian to link two nations

NASA, Texas Instruments Launch mISSion imaginaTIon

Water in US astronaut's helmet cuts short Briton's 1st spacewalk

Roscosmos prepares to launch first manned Soyuz MS

CARBON WORLDS
EpicNG satellite installed on Ariane 5 for launch

Building a robust commercial market in low earth orbit

NASA awards ISS cargo transport contracts

SpaceX will try to land its reusable rocket on an ocean dock

CARBON WORLDS
Follow A Live Planet Hunt

Lab discovery gives glimpse of conditions found on other planets

Nearby star hosts closest alien planet in the 'habitable zone'

ALMA reveals planetary construction sites

CARBON WORLDS
CSU imaging tool maps cells' composition in 3-D

Gloop from the deep sea

High-performance material polyimide for the first time with angular shape

Copper deposition to fabricate tiny 3-D objects









The content herein, unless otherwise known to be public domain, are Copyright 1995-2024 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. General Data Protection Regulation (GDPR) Statement Our advertisers use various cookies and the like to deliver the best ad banner available at one time. All network advertising suppliers have GDPR policies (Legitimate Interest) that conform with EU regulations for data collection. By using our websites you consent to cookie based advertising. If you do not agree with this then you must stop using the websites from May 25, 2018. Privacy Statement. Additional information can be found here at About Us.