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
'Chance for a new start': Croatia writes off debts of 60,000 poorest citizens
Village of Bobodol, near Knin, in central Croatia
Croatian government have gotten creditors on board a plan to erase the debts of some 60,000 poorest citizens. The “fresh start” scheme targets less than 1 percent of the entire debt, but is hoped to boost the economy in the long-term.
The unorthodox measure was voted for by the government on January 15 and ...
Honeypot warning issued by UK MoD: No sex with Russian or Chinese girls
Top brass have been warned not to have sex with Russian and Chinese girls however stunning they may be, as it may turn out a ‘honeytrap’, a leaked UK Ministry of Defense (MoD) document says.
The paper, obtained by the Sunday Times,gives detailed instructions that the Russian intelligence, the FSB, may try to compromise and blackmail foreign agents “through knowledge of ...
Do Many Neocons Just Hate All Europeans?
Neocon Globalist Charles Krauthammer
A few months ago I encountered at a conference an eminent Straussian scholar who teaches at an Ivy League institution, and he almost immediately launched into a tirade against “the Europeans,” who are at the point of “finishing Hitler’s work.” The only exception that my interlocutor would concede to this sweeping statement was for the English “who ...
Swedish Feminists Drink Blood
Swedish Feminists drink menstrual blood to fight the Patriarchy!
Here is the story from alltomstockholm.se as translated by Google (English not 100% correct)
A feast to celebrate the woman - and your period
Menstruation - and this year's celebration.
Theatre Bristol salute month's bloodiest weeks and cause menstrual celebration of International Women's Day.
- We will offer menstrual drinks, says Daniela Kullman.
On International Women's Day ...
'What do we need this war for?' Ukrainians flee from 100k army draft
With the heavy fighting taking its toll on the Ukrainian army, another military draft is underway - the fourth within less than a year. It's the largest one to date - set to get 100k people into the military. This includes everyone up to the age of 60, with a voluntary mobilization for women. Fleeing the draft some are getting ...
|More News » |