The Strongest Advanced Materials In The World
Making Stuff Stronger
What is the strongest material in the world? Is it steel, Kevlar, carbon nanotubes, or something entirely new? NOVA kicks off the four-part series "Making Stuff" with a quest for the world's strongest substances. Host David Pogue takes a look at what defines strength, examining everything from steel cables to mollusk shells to a toucan's beak. Pogue travels from the deck of a U.S. naval aircraft carrier to a demolition derby to the country's top research labs to check in with experts who are re-engineering what nature has given us to create the next generation of strong stuff.
Limpet teeth has displaced spider silk as the strongest natural material in the world, according to new research from the University of Portsmouth.
A few years ago, when the surprising strength of spider silk was discovered, it was widely reported that its 4 GPa score is equivalent to that of steel. ( SCIENCE DOCUMENTARY )
Some scientists took issue with this characterisation following a move to breed 'spider goats' that could produce milk with extra protein that could be converted into the super strong silk.
Man-made materials are predictably better at withstanding pressure, with graphene-based nanoplateletes among the several chemical concoctions reporting GPa well into double figures. [ BBC documentary ]
But those sea snail teeth is the strongest natural substance around, incredibly durable even in comparison to manufactured materials, and may yet be used in the development of material for high-performance engineering applications like Formula 1 cars, and aircraft structures.
That strength, however, could be hard to comprehend, with Professor Asa Barber, ( Documentary Films Full Length ) who led the study, rather confusingly likening the feat to a piece of spaghetti enduring the force of 3000 bags of sugar.
Scientists don't actually use bags of sugar to test ultimate-tensile-strength; what they normally do is take a specifically sized sample of the material and try to pull it apart using something called a tensometer which increases the force until the thing breaks.
Barber and his cohorts used a new technique: an atomic force microscopy that pulled apart the tooth material all the way down to the level of the atom — the sample used was 100 times thinner than the breadth of a human hair. [ Documentaries BBC ]
The ability to withstand that pressure is measured in gigapascals (GPa).
The mineral-protein composite of which the limpet teeth are made has a GPa of 4.9.
To put that in perspective, it's almost five times as strong as bamboo, and ten times as strong as human teeth.
Limpets, which are essentially very small sea snails, have 1mm teeth made of "an almost ideal" mix of protein supported by fine mineral nanofibers called goethite, according to Barber. BBC Science Nature Documentary