Pages Menu
TwitterRssFacebook
Categories Menu

Posted by on May 22, 2017 in Tell Me Why |

What Is the Strongest Material?

What Is the Strongest Material?

In materials, there is usually a trade-off between hardness and brittleness versus ductility and flexibility. The strength of any material is its ability to resist stretching, pressing together, and tearing-what the scientists call tension, compression and shear.

No one material is the strongest for all purposes. For example, cast iron is immensely strong in resisting steady compression, but is easily broken by a sharp hammer-blow. Some materials are made stronger by the addition of other substances.

A little carbon added to iron makes it stronger and produces steel. The addition of silicon or magnesium to low-strength aluminum forms a light weight, high-strength alloy used for aircraft engines and other highly-stressed mechanisms.

Nylon and similar plastics have introduced new standards of strength in non-metallic materials. They are made from basic substances such as coal, salt, petroleum, air and water, and are very tough and resistant to wear.

The material you are looking for depends on the situation you are dealing with. Elemental carbon is extremely versatile, and scientists have long been able to create new carbon allotropes that make for super durable and multi-functioning materials – such as everyone’s favorite material, graphene.

Graphene has an excellent strength when it comes to tensile (stretching) forces.  But since graphene is essentially two-dimensional, it needs to be combined with some other material to obtain the greatest strength benefits.

The ‘carbon family’ is one very resourceful family. But even with all these developments, carbyne remained elusive. In fact, it is the only form of carbon that has not been synthesised, even though researchers have been studying its properties for over 50 years.

The reason for this is that carbyne is extremely unstable. This one-dimensional carbon chain was first discovered in 1885 by Adolf von Baeyer, who even stated that carbyne would remain elusive, as its high reactivity would always lead to its immediate destruction.

Carbyne’s mechanical properties are hypothesised to exceed all known materials. It’s assumed to be twice as stiff as graphene, 40 times stiffer than diamond, and have greater tensile strength than any other carbon material. With these kinds of properties, no wonder we’ve been trying to find ways to stabilise it.

And now, an international team of researchers have now found a way to mass-produce carbyne.

The team took two layers of graphene, pressed them together, and rolled them into thin, double-walled carbon nanotubes. The tubes were then wrapped around the atoms. These nanotubes protect the carbyne chains from meeting imminent doom.

Their research is published in the journal Nature Materials.

Before their discovery, the record-holding number of carbon atoms in one continuous chain was 100. Now, the record has been broken with an astounding 6,400 atoms utilizing this novel method – and the chain continues to be stable.

Also, carbyne’s electrical properties increase with its chain length. This means that researchers will be able to experiment with the material more effectively with success from the nanotubes.

There is a huge wealth of possible applications using carbyne, and we’re excited to see what kinds of devices will arise with the delivery of this ‘miracle’ material.

Content for this question contributed by Matthew Pearce, resident of Santa Cruz, Santa Cruz County, California, USA