Featured Research

from universities, journals, and other organizations

New fracture resistance mechanisms provided by graphene

Date:
April 14, 2011
Source:
University of Arizona College of Engineering
Summary:
Graphene can be used to enhance the toughness of ceramics, new research shows. This discovery -- which increased the resulting ceramic composite's fracture resistance by over 200 percent -- could potentially be used to enhance toughness for a wide range of high performance ceramic materials for aerospace and other applications.

High resolution SEM image after colloidal processing indicating partially exfoliated GPL mixed with well-dispersed Si3N4 particles. The images clearly indicate GPL decorated with Si3N4 particles; the Si3Nk4 particles are well-dispersed throughout the surface area of the sheets.
Credit: ACS Publications/UA Engineering

A team of researchers from the University of Arizona and Rensselaer Polytechnic Institute have increased the toughness of ceramic composites by using graphene reinforcements that enable new fracture resistance mechanisms in the ceramic.

The research, lead by Assistant Professor Erica L. Corral from the Materials Science and Engineering Department at the University of Arizona in Tucson, and Professor Nikhil Koratkar from the Department of Mechanical, Aerospace and Nuclear Engineering at Rensselaer Polytechnic Institute in Troy, New York, was recently published in ACS Nano, the monthly journal of the American Chemical Society.

"Our work on graphene ceramic composites is the first of its kind in the open literature and shows mechanisms for toughening using two-dimensional graphene sheets that have yet to be seen in ceramic composites," said Corral. "We have significantly increased the toughness of a ceramic and made the first observations of graphene that arrest crack propagation and force the crack to change directions in not just two but also three dimensions."

These observations will lead to a new approach for composite design using graphene in ceramics that has not been possible using conventional fiber reinforcements, says Corral. "The high surface area and unique two-dimensional sheet geometry seem to be better at arresting crack growth in ceramics over conventional fibers that are one-dimensional reinforcements," she said.

"This is a classic example of highly successful interdisciplinary research across universities that was unheard of 15 or 20 years ago, but is now becoming critically important if we are to continue to make breakthrough discoveries and maintain the competiveness of the United States in the 21st century," said Prof. Koratkar of the Rensselaer Polytechnic Institute. Koratkar met Dr. Corral at a National Science Foundation-sponsored nanoscience conference where she delivered a talk on her work in carbon nanotube ceramic composites.

Koratkar was impressed with Corral's presentation, and approached her regarding the possibility of exploring the use of graphene to increase toughening in brittle ceramics. "Over the next year we leveraged my lab's expertise in the synthesis of bulk quantities of graphene platelets and the expertise of Corral's group in ceramic composite fabrication and testing," Koratkar said. "Our results published in ACS Nano show the tremendous promise that graphene shows in toughening ceramics that are notoriously brittle and prone to failure. This work could open up an entirely new graphene ceramic nanocomposites field of study," he says.

This is the first published work describing the use of graphene nanofiller to reinforce ceramics and will appear in the journal ACS Nano. This discovery -- measured to increase fracture resistance of the resulting ceramic nanocomposite by over 200 percent -- could potentially be used to enhance toughness for a range of ceramic materials, enabling their widespread use in high-performance, structural applications that require operating temperatures greater than 1,000 degrees Celsius while maintaining structural integrity.


Story Source:

The above story is based on materials provided by University of Arizona College of Engineering. Note: Materials may be edited for content and length.


Journal Reference:

  1. Luke S. Walker, Victoria R. Marotto, Mohammad A. Rafiee, Nikhil Koratkar, Erica L. Corral. Toughening in Graphene Ceramic Composites. ACS Nano, 2011; 110331091002068 DOI: 10.1021/nn200319d

Cite This Page:

University of Arizona College of Engineering. "New fracture resistance mechanisms provided by graphene." ScienceDaily. ScienceDaily, 14 April 2011. <www.sciencedaily.com/releases/2011/04/110413093214.htm>.
University of Arizona College of Engineering. (2011, April 14). New fracture resistance mechanisms provided by graphene. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2011/04/110413093214.htm
University of Arizona College of Engineering. "New fracture resistance mechanisms provided by graphene." ScienceDaily. www.sciencedaily.com/releases/2011/04/110413093214.htm (accessed October 22, 2014).

Share This



More Matter & Energy News

Wednesday, October 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Chameleon Camouflage to Give Tanks Cloaking Capabilities

Chameleon Camouflage to Give Tanks Cloaking Capabilities

Reuters - Innovations Video Online (Oct. 22, 2014) — Inspired by the way a chameleon changes its colour to disguise itself; scientists in Poland want to replace traditional camouflage paint with thousands of electrochromic plates that will continuously change colour to blend with its surroundings. The first PL-01 concept tank prototype will be tested within a few years, with scientists predicting that a similar technology could even be woven into the fabric of a soldiers' clothing making them virtually invisible to the naked eye. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Jet Sales Lift Boeing Profit 18 Pct.

Jet Sales Lift Boeing Profit 18 Pct.

Reuters - Business Video Online (Oct. 22, 2014) — Strong jet demand has pushed Boeing to raise its profit forecast for the third time, but analysts were disappointed by its small cash flow. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Internet of Things Aims to Smarten Your Life

Internet of Things Aims to Smarten Your Life

AP (Oct. 22, 2014) — As more and more Bluetooth-enabled devices are reaching consumers, developers are busy connecting them together as part of the Internet of Things. (Oct. 22) Video provided by AP
Powered by NewsLook.com
What Is Magic Leap, And Why Is It Worth $500M?

What Is Magic Leap, And Why Is It Worth $500M?

Newsy (Oct. 22, 2014) — Magic Leap isn't publicizing much more than a description of its product, but it’s been enough for Google and others to invest more than $500M. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins