Featured Research

from universities, journals, and other organizations

New material class developed: Pentamode metamaterial

Date:
May 8, 2012
Source:
Karlsruhe Institute of Technology
Summary:
Engineers have succeeded in realizing a new material class through the manufacturing of a stable crystalline metafluid, a pentamode metamaterial. Using new nanostructuring methods, these materials can now be realized for the first time with any conceivable mechanical properties.

Pentamode metamaterials almost behave like fluids. Their manufacture opens new possibilities in transformation acoustics.
Credit: CFN, KIT

A research team lead by Professor Martin Wegener at the Karlsruhe Institute of Technology (KIT) has succeeded in realizing a new material class through the manufacturing of a stable crystalline metafluid, a pentamode metamaterial. Using new nanostructuring methods, these materials can now be realized for the first time with any conceivable mechanical properties.

Related Articles


The researchers will present their results in the cover story of the May issue of Applied Physics Letters.

The Rubicon was crossed, so to speak, at the DFG Center for Functional Nanostructures (CFN) and at the Institute of Applied Physics (AP) in Karlsruhe during the past few months. Eventually, numerous three-dimensional transformation acoustics ideas, for example inaudibility cloaks, acoustic prisms or new loudspeaker concepts, could become reality in the near future.

So far, pentamodes, proposed in 1995 by Graeme Milton and Andrej Cherkaev, have been purely theoretical: The mechanical behavior of materials such as gold or water is expressed in terms of compression and shear parameters. Whereas the phenomenon that water, for example, can hardly be compressed in a cylinder is described through the compression parameter, the fact that it can be stirred in all directions using a spoon is expressed through the shear parameters.

The word penta is derived from ancient Greek and means "five." In the case of water, the five shear parameters equal zero, and only one parameter, compression, differs from that value. In terms of parameters, the ideal state of a pentamode metamaterial corresponds to the state of water, which is why that material is referred to as a metafluid. Theoretically, any conceivable mechanical properties whatsoever can be obtained by varying the relevant parameters.

"Realizing a pentamode metamaterial is about as difficult as trying to build a scaffold from pins that must not touch but at their tips," first author Dr. Muamer Kadic explains. "The Karlsruhe prototype has been manufactured from a polymer. The mechanical behavior of the material is determined by the acuteness and length of the individual "sugar loaves." On the one hand, we must be capable of designing small sugar loaves in the nanometer range and connect them to one another at the right angle. On the other hand, the entire structure must eventually become as large as possible. Since the material itself contributes only little more than one percent to the respective volume, the composite obtained is extremely light.

"To obtain similar 3D results, as in transformation optics, transformation acoustics is exclusively dependent on metamaterials. In view of this, this first manufacture of our pentamode metamaterial is a quite significant success," adds Tiemo Bόckmann, who is about to receive his diploma at the Institute of Applied Physics and is responsible for realizing the structures of the new material by means of dip-in laser writing, a method that has been derived from direct laser writing developed by the Nanoscribe company.

In recent years, a Professor at the Institute of Applied Physics and CFN coordinator, Martin Wegener and his collaborators, have developed direct laser writing and, based on that method, established optical lithography of three-dimensional nanostructures. Numerous achievements of Wegener's group in transformation optics e.g., the first three-dimensional cloak of invisibility in the range of visible light have been due to that technique.


Story Source:

The above story is based on materials provided by Karlsruhe Institute of Technology. Note: Materials may be edited for content and length.


Journal Reference:

  1. Muamer Kadic, Tiemo Bückmann, Nicolas Stenger, Michael Thiel, Martin Wegener. On the practicability of pentamode mechanical metamaterials. Applied Physics Letters, 2012; 100 (19): 191901 DOI: 10.1063/1.4709436

Cite This Page:

Karlsruhe Institute of Technology. "New material class developed: Pentamode metamaterial." ScienceDaily. ScienceDaily, 8 May 2012. <www.sciencedaily.com/releases/2012/05/120508103801.htm>.
Karlsruhe Institute of Technology. (2012, May 8). New material class developed: Pentamode metamaterial. ScienceDaily. Retrieved March 6, 2015 from www.sciencedaily.com/releases/2012/05/120508103801.htm
Karlsruhe Institute of Technology. "New material class developed: Pentamode metamaterial." ScienceDaily. www.sciencedaily.com/releases/2012/05/120508103801.htm (accessed March 6, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Friday, March 6, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Driverless Budii Gives the Wheel Feel

Driverless Budii Gives the Wheel Feel

Reuters - Business Video Online (Mar. 6, 2015) — The Rinspeed Budii Concept car is creating a driverless stir at this year&apos;s Geneva car show. It&apos;s an all-electric autonomous vehicle with a difference. Ciara Lee reports. Video provided by Reuters
Powered by NewsLook.com
Star Wars Inspires Mobile Holograms

Star Wars Inspires Mobile Holograms

Reuters - Business Video Online (Mar. 6, 2015) — 3D holograms could soon be coming to your mobile phone. Inspired by the famous Princess Leia hologram from Star Wars, a U.S. company is showcasing a prototype display at the Mobile World Congress at Barcelona and says it could be used for real-time video calls. Ivor Bennett reports Video provided by Reuters
Powered by NewsLook.com
Game Makers Lured Into Virtual Worlds

Game Makers Lured Into Virtual Worlds

AFP (Mar. 6, 2015) — Some 25,000 people have descended upon San Francisco to show off the latest technologies and video games at the Game Developers Conference. Developers here discuss the future of the industry. Duration: 02:20. Video provided by AFP
Powered by NewsLook.com
Gas Production Cut on Earthquake Fears

Gas Production Cut on Earthquake Fears

Reuters - Business Video Online (Mar. 5, 2015) — The Dutch government has cut production at Europe&apos;s largest gas field in Groningen amid concerns over earthquakes which are damaging local churches. As Amy Pollock reports the decision - largely politically-motivated - could have big economic conseqeunces. Video provided by Reuters
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