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Archive for the ‘energy’ category: Page 281

Apr 16, 2019

The Quest for the Most Elusive Material in Physics

Posted by in categories: energy, physics

Zack Geballe spent months screwing together pairs of polished diamonds at the Carnegie Institution for Science’s Geophysical Laboratory. Theory predicted that squeezed between the diamonds’ tips could be one of the most miraculous substances of modern physics—a material that, at near room temperature, could transport electricity without losing power. He just needed to get the samples to Argonne National Lab outside Chicago to heat them up with laser pulses.

When Argonne beam line scientist Yue Meng turned the lasers on, all four diamonds cracked in half.

“It was a total catastrophe,” Geballe told me while I was visiting him at the Geophysical Laboratory in Washington, DC, this year.

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Apr 15, 2019

Quantum entangled batteries could be the perfect power source

Posted by in categories: energy, quantum physics

Two European theoretical physicists have shown that it may be possible to build a near-perfect, entangled quantum battery. In the future, such quantum batteries might power the tiniest of devices — or provide power storage that is much more efficient than state-of-the-art lithium-ion battery packs.

To understand the concept of quantum batteries, we need to start (unsurprisingly) at a very low level. Today, most devices and machines that you interact with are governed by the rules of classical mechanics (Newton’s laws, friction, and so on). Classical mechanics are very accurate for larger systems, but they fall apart as we begin to analyze microscopic (atomic and sub-atomic) systems — which led to a new set of laws and theories that describe quantum mechanics.

In recent years, as our ability to observe and manipulate quantum systems has grown — thanks to machines such as the Large Hadron Collider and scanning tunneling electron microscopes — physicists have started theorizing about devices and machines that use quantum mechanics, rather than classical. In theory, these devices could be much smaller, more efficient, or simply act in rather unsurprising ways. In this case, Robert Alicki of the University of Gdansk in Poland, and Mark Fannes of the University of Leuven in Belgium, have defined a battery that stores and releases energy using quantum mechanics.

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Apr 13, 2019

Neutral Zinc-air battery with cathode NiCo/C-N shows outstanding performance

Posted by in categories: bioengineering, energy, sustainability

In a paper to be published in the forthcoming issue in NANO, a team of researchers from the School of Chemistry and Chemical Engineering at Hunan University of Science and Technology have proposed a novel strategy for the synthesis of non-precious metal catalysts in zinc-air batteries that do not compromise its electroactivity, affordability and stability.

As a green and sustainable energy generator, zinc-air battery has attracted great attention from researchers due to its high specific energy, high current density, low cost, and environmental friendliness. Yet it is not without its drawbacks. The slow oxygen reduction reaction (ORR) of its cathode has become an obstacle to its commercial application. One possible solution is to use platinum (Pt) and Pt-based catalysts, but its high cost and scarce availability make it less ideal. In addition, alkaline KOH (or NaOH) is generally used as the electrolyte, but it leads to the generation of carbonates (CO32-) due to the dissolution of CO2 in the electrolyte as well as the spontaneous corrosion of the anodic zinc in strong alkaline media. This has the effect of slowing down the ionic conductivity of the electrolyte and battery life. Therefore, a neutral electrolyte should be used instead.

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Apr 11, 2019

Physics KS3 / GCSE: Death of the Sun and stars

Posted by in categories: energy, physics

Professor Brian Cox explains the process that causes all stars, including eventually our own sun, to die.

Stars are only able to survive as long as they have a supply of hydrogen to burn.

Our star, the Sun, will run out of fuel in about a billion years.

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Apr 10, 2019

Scientists Discover Ancient ‘Cthulhu’ Fossil That Will Give You Nightmares

Posted by in categories: energy, food

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Despite its diminutive size, the creature still managed to pack a lot of nightmare fuel. Those 45 tentacles were used to snatch up food, creep along the ocean floor and scare off predators.

Oh, and those “tubes” also had their own armor.

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Apr 10, 2019

Graphene coating could help prevent lithium battery fires

Posted by in categories: energy, engineering, transportation

Lithium batteries are what allow electric vehicles to travel several hundred miles on one charge. Their capacity for energy storage is well known, but so is their tendency to occasionally catch on fire—an occurrence known to battery researchers as “thermal runaway.” These fires occur most frequently when the batteries overheat or cycle rapidly. With more and more electric vehicles on the road each year, battery technology needs to adapt to reduce the likelihood of these dangerous and catastrophic fires.

Researchers from the University of Illinois at Chicago College of Engineering report that graphene—wonder material of the 21st century—may take the oxygen out of lithium battery fires. They report their findings in the journal Advanced Functional Materials.

The reasons catch fire include rapid cycling or charging and discharging, and in the battery. These conditions can cause the cathode inside the battery—which in the case of most lithium batteries is a lithium-containing oxide, usually lithium cobalt oxide—to decompose and release oxygen. If the oxygen combines with other flammable products given off through decomposition of the electrolyte under high enough heat, spontaneous combustion can occur.

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Apr 10, 2019

Novel membrane material removes more impurities without the need for toxic solvents

Posted by in categories: energy, materials

Natural gas and biogas have become increasingly popular sources of energy throughout the world in recent years, thanks to their cleaner and more efficient combustion process when compared to coal and oil.

However, the presence of contaminants such as within the gas means it must first be purified before it can be burnt as fuel.

Traditional processes to purify typically involve the use of toxic solvents and are extremely energy-intensive.

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Apr 10, 2019

Tesla’s Wireless Energy Technology Being Revived in Texas

Posted by in category: energy

A century after Nikola Tesla’s famous Wardenclyffe tower was dismantled, the legacy of the world’s greatest inventor lives on in the form of a new project which aims to develop wireless power transmission and a host of other communications and energy functions.

Strikingly similar to the Wardenclyffe tower, a new facility has gone up along a major transit route in the town of Milford, Texas. Built and operated by a company called Visiv Technologies, the tower is designed for precisely the same functions as the original Tesla tower, that is, for wireless communications and the transmission of electricity through air via low-frequency radio waves known as ‘surface waves.’

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Apr 10, 2019

SpaceX to livestream Falcon Heavy Block 5 launch debut at 6:15pm ET today

Posted by in categories: energy, satellites

SpaceX is half a day away from the planned launch debut of Falcon Heavy Block 5, a milestone that will also be the rocket’s second launch ever and first mission with a commercial payload.

First and foremost, Falcon Heavy’s job is to safely place the Saudi Arabian communications satellite Arabsat 6A into a high-energy geostationary transfer orbit (GTO) more than 35,000 km (~22,000 mi) above Earth’s surface. Despite the satellite weighing no less than 6000 kg (13,200 lb), Falcon Heavy will still have enough latent performance to attempt the recovery of all three of its new Block 5 boosters. With any luck, this will hopefully return SpaceX’s East Coast landing zones (LZ-1 and LZ-2) to successful operations after an anomaly in December 2018 caused Falcon 9 B1051 to landing a mile or so offshore.

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Apr 9, 2019

Could dynamos be installed in electric cars to provide a perpetual source of power?

Posted by in categories: energy, physics, transportation

We already recover power from the wheels of some cars when slowing. Kinetic energy recovery systems (KERS) have been used in Formula One racing to store energy in a flywheel when braking, and then push it back to the wheels later for a boost in speed. Electric cars often use regenerative braking, which converts the speed of the wheels into electrical power to recharge the battery. These systems are a great way to increase efficiency, but like everything in the Universe, they are not 100 per cent efficient. Sadly, the laws of physics prohibit the existence of true perpetual motion, so it’s the best we can do.

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