Graphene News and Discussions

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Yuli Ban
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Graphene News and Discussions

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A general thread for graphene news
Out of the lab, it goes!

World's first graphene-enhanced concrete slab poured in England
As the mostly widely used material on Earth, concrete has a massive carbon footprint that scientists are working to chip away at in all sorts of ways. Recent research projects have demonstrated how the wonder material graphene could play a role in this and now we're seeing the first real-world deployment of the technology, with engineers using so-called "Concretene" to form the foundations of a new gym in the UK.

As the world's strongest artificial material, graphene may have a lot to offer the world of construction, among its many other potential uses. Scientists have previously found success incorporating it into the concrete manufacturing process to make the finished product stronger and more water-resistant, while one research project even demonstrated how this graphene can be recovered from old tires.

The freshly poured Concretene is the handiwork of scientists at the University of Manchester and construction firm Nationwide Engineering. To form the material, the team adds tiny amounts of graphene to water and cement, where it both acts as a mechanical support and offers an extra catalyst surface for the chemical reactions that turn the mix into the concrete paste. The end result is improved bonding at a microscopic scale, and material that is around 30 percent stronger than standard concrete.
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Yuli Ban
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MIT Turns “Magic” Superconducting Material Into Versatile Electronic Devices
“In this work we have demonstrated that magic-angle graphene is the most versatile of all superconducting materials, allowing us to realize in a single system a multitude of quantum electronic devices. Using this advanced platform, we have been able to explore for the first time novel superconducting physics that only appears in two dimensions,” says Pablo Jarillo-Herrero, the Cecil and Ida Green Professor of Physics at MIT and leader of the work. Jarillo-Herrero is also affiliated with MIT’s Materials Research Laboratory.
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Ultra-high-density hard drives made with graphene store ten times more data
June 7, 2021

Graphene can be used for ultra-high density hard disk drives (HDD), with up to a tenfold jump compared to current technologies, researchers at the Cambridge Graphene Center have shown.

The study, published in Nature Communications, was carried out in collaboration with teams at the University of Exeter, India, Switzerland, Singapore, and the US.

HDDs first appeared in the 1950s, but their use as storage devices in personal computers only took off from the mid-1980s. They have become ever smaller in size, and denser in terms of the number of stored bytes. While solid state drives are popular for mobile devices, HDDs continue to be used to store files in desktop computers, largely due to their favorable cost to produce and purchase.

HDDs contain two major components: platters and a head. Data are written on the platters using a magnetic head, which moves rapidly above them as they spin. The space between head and platter is continually decreasing to enable higher densities.
https://phys.org/news/2021-06-ultra-hig ... e-ten.html
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Yuli Ban
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Graphene can be made to superconduct by placing it next to a Bose-Einstein condensate – a form of matter in which all the atoms are in the same quantum state
Graphene can be made to superconduct by placing it next to a Bose-Einstein condensate – a form of matter in which all the atoms are in the same quantum state. According to the theorists who discovered it, this new type of superconductivity stems from interactions between the electrons in graphene and quasiparticles called “bogolons” in the condensate. If demonstrated experimentally, the work could make it possible to develop new types of hybrid superconducting devices for applications in quantum sensing and quantum computing.

Conventional superconductivity occurs when phonons – quasiparticles that arise from vibrations in a material’s crystal lattice – cause electrons in the material to pair up despite their mutual electromagnetic repulsion. If the material is cooled to sufficiently low temperatures, these paired electrons (known as Cooper pairs) can travel through it without any resistance.

Bose-Einstein condensates (BECs) form when bosons, or particles with integer quantum spin, are cooled until they are all in the same quantum state. Within this special “fifth state of matter”, quasiparticles called Bogoliubov excitations can develop. Named after the Russian physicist Nikolaï Bogoliubov, who was the first to provide a theoretical description of them, these quasiparticles are usually known as bogolons. Ivan Savenko, who led the research at the Institute for Basic Science (IBS) in Korea, explains that bogolons are similar to phonons in the sense that they also serve as mediators for electron-electron attractions.
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Graphene used in 'world first' road surface trial on A1

2 days ago

The so-called wonder material graphene is to be used in resurfacing the A1 in Northumberland in what the government says is a "world first".

The trial will examine whether the material, which is only one atom thick, could prolong the lifespan of roads.

Graphene has been used to enhance new asphalt when mixed with plastic but this is the first time it will be added to recycled asphalt on site.

National Highways manager Graeme Watt said it could be "industry changing".

"Laboratory trials have been a success and the on-site trials in Northumberland will be a world first use of graphene in road production," he said. 

"From what we've seen so far, it could make some of our assets last significantly longer."

https://www.bbc.co.uk/news/uk-england-tyne-58501947
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After 70 years, advanced carbon-based magnetic material finally synthesized
https://phys.org/news/2021-11-years-adv ... erial.html
by Osaka University
Since the first reported production in 2004, researchers have been hard at work using graphene and similar carbon-based materials to revolutionize electronics, sports, and many other disciplines. Now, researchers from Japan have made a discovery that will advance the long-elusive field of nanographene magnets.

In a study recently published in Journal of the American Chemical Society, researchers from Osaka University and collaborating partners have synthesized a crystalline nanographene with magnetic properties that have been predicted theoretically since the 1950s, but until now have been unconfirmed experimentally except at extremely low temperatures.

Graphene is a single layer, two-dimensional sheet of carbon rings arranged in a honeycomb lattice. Why does graphene excite researchers? Graphene has impressive properties—it exhibits efficient, long-distance charge transport and has a much higher strength than similarly thick steel. Nanostructures of graphene have edges that exhibit magnetic and electronic properties that researchers would like to exploit. However, graphene nanosheets are difficult to prepare and it's difficult to study their zigzag edge properties. Overcoming these challenges by using a simpler, yet advanced, model system known as triangulene is something the researchers at Osaka University aimed to address.
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Developing wafer-scale highly oriented graphene on sapphire
https://phys.org/news/2021-12-wafer-sca ... phire.html
by Thamarasee Jeewandara , Phys.org
Researchers have used direct chemical vapor deposition (CVD) growth of wafer-scale, high-quality graphene on dielectrics for versatile applications. However, graphene synthesized this way has shown a polycrystalline film with uncontrolled defects, a low carrier mobility, and high street resistance; therefore, researchers aim to introduce new methods to develop wafer-scale graphene. In a new report now published in Science Advances, Zhaolong Chen and an international research team in nanochemistry, intelligent materials and physics, in China, U.K. and Singapore, described the direct growth of highly oriented monolayer graphene on films of sapphire wafers. They achieved the growth strategy by designing an electromagnetic induction CVD at elevated temperature. The graphene film developed in this way showed a markedly improved carrier mobility and reduced sheet resistance.
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