Made-To-Order Materials: Engineers Focus On the Nano to Create Strong, Lightweight Materials
The lightweight skeletons of organisms such as sea sponges display a strength that far exceeds that of humanmade products constructed from similar materials.
Scientists have long suspected that the difference has to do with the hierarchical architecture of the biological materials -- the way the silica-based skeletons are built up from different structural elements, some of which are measured on the scale of billionths of meters, or nanometers. Now engineers at the California Institute of Technology (Caltech) have mimicked such a structure by creating nanostructured, hollow ceramic scaffolds, and have found that the small building blocks, or unit cells, do indeed display remarkable strength and resistance to failure despite being more than 85 percent air.
Three-dimensional, hollow titanium nitride nanotruss with tessellated octahedral geometry. Each unit cell is on the order of 10 microns, each strut length within the unit cell is about three to five microns, the diameter of each strut is less than one micron, and the thickness of titanium nitride is roughly 75 nanometers.
"Inspired, in part, by hard biological materials and by earlier work by Toby Schaedler and a team from HRL Laboratories, Caltech, and UC Irvine on the fabrication of extremely lightweight microtrusses, we designed architectures with building blocks that are less than five microns long, meaning that they are not resolvable by the human eye," says Julia R. Greer, professor of materials science and mechanics at Caltech. "Constructing these architectures out of materials with nanometer dimensions has enabled us to decouple the materials’ strength from their density and to fabricate so-called structural metamaterials which are very stiff yet extremely lightweight."
At the nanometer scale, solids have been shown to exhibit mechanical properties that differ substantially from those displayed by the same materials at larger scales. For example, Greer’s group has shown previously that at the nanoscale, some metals are about 50 times stronger than usual, and some amorphous materials become ductile rather than brittle. "We are capitalizing on these size effects and using them to make real, three-dimensional structures," Greer says.
Read the full article at: sciencedaily.com
Water Nanofilter ‘Could Cut Diarrhea-Related Deaths’
Researchers watch nanoparticles self-assemble for the very first time
Nano-Suit Protects Bugs From Space-Like Vacuums
Nanoparticles Are in Our Food, Clothing and Medicine -- And No One Knows for Sure How Dangerous They Might Be
Nanomaterial Can Stop a Speeding Bullet, Strengthen Soldiers’ Body Armor
Nanotechnology condoms could provide greater protection against HIV and Herpes
Britain: Nanoscale Energy Storage Material Under Development
Upsalite: Scientists make ’impossible material’... by accident
Quantum Computers Coming Soon? Metamaterials Used to Observe Photonic Spin
Supertough, Strong Nanofibers Developed
Latest News from our Front Page
ISIS teenage 'poster girl' Samra Kesinovic 'beaten to death' as she tried to flee the group
She appeared in social media images for the group carrying a Kalashnikov and surrounded by armed men
A teenage girl who ran away from her Vienna home to join Isis in Syria has reportedly been beaten to death by the group after trying to escape.
Samra Kesinovic, 17, travelled to Syria last year with her friend Sabina Selimovic, 15.
The two became a ...
The Right Stuff's flagship podcast "The Daily Shoah" has been censored by Soundcloud
Editor's note: The PC corporate moral police strike again. Just as Radio 3Fourteen & Red Ice Radio were censored from iTunes, The Daily Shoah was pulled from Soundcloud today. As per usual, there is a double standard, they allow any kind of anti-White material:
No counter culture humor making fun of the genocidal mainstream garbage is allowed!
Soundcloud took it upon ...
Merkel Welcomes A Million More: Vows To Stand By Refugee Policy Despite Security Fears
Chancellor Angela Merkel vowed on Wednesday to stick to her open-door refugee policy, defying criticism at home and abroad which has intensified due to growing fears about a potential security risk after the Islamist attacks in Paris.
Conservative Merkel faces splits in her right-left coalition and pressure from EU states, including France, over her insistence that Germany can cope with up ...
Paris Terrorist Was Gay 'Rent Boy', On The Run From Islamic State And Police
The elusive eighth Paris attacker and one of three brothers implicated in the atrocity reportedly frequented gay clubs before the attack. He may have backed out of his mission at the last minute, and is possibly on the run from Islamic State as well as authorities.
â€śWe had him down as a rent boy, he was always hanging out with that ...
Sweden slams shut its open-door policy towards refugees
Sweden needs â€śrespiteâ€ť from the tens of thousands of refugees knocking at its door, the government has said, announcing tough measures to deter asylum seekers in a sharp reversal of its open-door policy towards people fleeing war and persecution.
The countryâ€™s generous asylum regime would revert to the â€śEU minimumâ€ť, Swedenâ€™s prime minister, Stefan LĂ¶fven, said on Tuesday, revealing that most ...
|More News » |