Friday, May 26, 2017

Three-dimensional graphene: Experiment at BESSY II shows that optical properties are tuneable

An international research team has for the first time investigated the optical properties of three-dimensional nanoporous graphene at the IRIS infrared beamline of the BESSY II electron storage ring. The experiments show that the plasmonic excitations (oscillations of the charge density) in this new material can be precisely controlled by the pore size and by introducing atomic impurities. This could facilitate the manufacture of highly sensitive chemical sensors.

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Thursday, May 25, 2017

Solving the riddle of the snow globe

A new study finds the sedimentation of asymmetric objects in liquid is very different from that of symmetrical objects like spheres. The research may have practical applications in improving water treatment and industrial processes.

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High pressure key to lighter, stronger metal alloys, scientists find

Subjecting complex metal mixtures called high-entropy alloys to extremely high pressures could lead to finer control over the arrangement of their atoms, which in turn can result in more desirable properties.

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Fuel from the air technology provides a path to new business for OPEC countries

Pioneering technology makes OPEC countries prime regions to produce synthetic fuels. This could be a key asset in phasing out fossil fuels after the Paris Agreement, while also keeping some of the existing oil industry value chain intact.

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Water is surprisingly ordered on the nanoscale

The surface of minuscule water drops with a 100 nm size is surprisingly ordered, new research shows. At room temperature, the surface water molecules of these droplets have much stronger interactions than a normal water surface. The structural difference corresponds to a difference in temperature of -50°C, which may shed new light on a variety of atmospheric, biological and even geological processes.

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Carcinogenic soot particles from petrol engines

First, diesel vehicles tainted their reputation with soot particles, then high nitric oxide emissions. So are owners of new gasoline cars environmentally friendly? Not always, says a new study scientists, some direct-injection gasoline engines emit just as many soot particles as unfiltered diesel cars did in the past. Particle filters can remedy this.

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New chemical reaction could eventually yield new fuels and medications

Chemists have developed a new technique to convert carbon-hydrogen bonds into carbon-carbon bonds using catalysts made of silicon and boron, both abundant and inexpensive elements.

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