Sentences with phrase «of ruthenium»

His seminal contribution to the field of inorganic chemistry for renewable energy is molecular engineering of ruthenium sensitizers, which convert solar energy through the use of high surface area nanocrystalline mesoscopic films of oxide semiconductors.

The coolest project was the evaluation of Ruthenium NAC - CORM molecules as agents for the cancer treatment, developed at the University of Cambridge during my PhD.

He notes that the amount of ruthenium - 106 that the French team estimates was emitted — between 1 gram and 4 grams — matches the 30 grams of cerium - 144 required for SOX, given that spent fuel contains the two isotopes in a ratio of about one to 14.

What's more, the ratio of ruthenium - 106 to the faster - decaying isotope ruthenium - 103, detected in smaller amounts last autumn, reveals that the fuel must have been removed from its reactor only a year or two earlier.

Jean - Christophe Gariel, IRSN's director of health, says an uncontrolled temperature rise during the separation of cerium from the spent fuel at Mayak might have converted some of the ruthenium in the waste to gaseous ruthenium oxide.

You could say that we have succeeded in performing modern alchemy by giving the iron properties which resemble those of ruthenium,» says Kenneth Wärnmark, Professor of Chemistry at the Faculty of Science at Lund University.

The mechanism is revealed by the isotopic labeling experiments and the stoichiometric reactions by use the 1,3 - butadiene complex of ruthenium.

Erich de Geer of the institute says detectors registered between 0.1 and 1.7 millionths of a becquerel of ruthenium, zirconium and niobium shortly after the accident.

The borohydride solution releases its hydrogen as it flows over a catalyst made of ruthenium.

The team of scientists from Brookhaven Lab, Stony Brook University, and the National University of San Luis in Argentina synthesized 2D aluminosilicate (composed of aluminum, silicon, and oxygen) films on top of a ruthenium metal surface.

The gel consists of a ruthenium compound that emits a bright light when a voltage is applied to it, along with an electrolyte and silica nanoparticles.

«The ink holds a compound of ruthenium that emits a bright light when a voltage is applied across it»...

The molecule consists of a ruthenium metal complex core with three self - assembly peptide building blocks attached in a three - dimensional structure.

As different cancers express different biomarkers, it might be possible to modify the molecular structure of the ruthenium molecule to target different types of cancer cell.»

It involved dispersing graphene oxide in a solution, loading in a small amount of ruthenium and then freeze - drying the new solution and turning it into a foam.

«As a next step, I deposited nanoparticles of ruthenium dioxide, a catalyst,» Azarpira explains.

For example, elevated concentrations of ruthenium, rhodium and gold were found in the Jura (presumably from the watchmaking industry), and of arsenic (presumably geogenic) in parts of Graubünden and Valais.

They compared the abundance of ruthenium isotopes in these meteorites with the abundance in Earth's mantle.

They are often based on metals, and the new example is no exception — it consists of atomically small particles of ruthenium, a metal related to iron, sitting on a material called cerium oxide.

Heating of a ruthenium surface on which carbon monoxide and atomic oxygen are coadsorbed leads exclusively to desorption of carbon monoxide.

Researchers detected the behavior in a crystal of ruthenium trichloride at the Oak Ridge National Laboratory in Tennessee.

Not exact matches

The dissociation of nitric oxide on a ruthenium (0001) surface was studied by scanning tunneling microscopy.

To accomplish this, they used compounds of the chemical element ruthenium as a catalyst.

But the cost of producing it by using electricity to split water is high, because the most efficient catalysts developed so far are often made with precious metals, like platinum, ruthenium and iridium.

This is a TEM image of CeO2 - supported ruthenium nanoparticles catalyst.

«The ruthenium data suggest comets could not have played a large part in the late addition of material to Earth,» says Lydia Hallis at the University of Glasgow, UK.

Robert Grubbs, a chemist now at the California Institute of Technology in Pasadena, and colleagues solved this problem by replacing molybdenum with ruthenium, a less electron - hungry transition metal.

In one recent study, they obtained good results by incorporating ruthenium ions into a sheet - like nanostructure composed of carbon nitride.

Performance was further improved by combining the ruthenium - doped carbon nitride with graphene, a sheet - like form of carbon, to form a layered composite.

First, they reacted their pyrolysis oils with hydrogen over a ruthenium and platinum catalyst, which stripped out much of the oxygen from the acids and added hydrogen.

Meade and his colleague, Jon Faiz Kayyem, first took a short length of DNA and modified it at each end by adding the element ruthenium and various aromatic side - groups.

Baking that at 750 degrees Celsius (1,382 degrees Fahrenheit) in the presence of nitrogen and hydrogen gas reduced the graphene and locked nitrogen atoms to the surface, providing sites where ruthenium atoms could bind.

«Ruthenium is often a highly active catalyst when fixed between arrays of four nitrogen atoms, yet it is one - tenth the cost of traditional platinum,» Tour said.

Spreading single ruthenium atoms across a sheet of graphene, the atom - thick form of carbon, turned out to be fairly straightforward, Tour said.

The process requires platinum, rhenium and ruthenium catalysts, in the shape of sand or gravel pellets, all of which are expensive and rare.

For 2 weeks in the fall of 2017, traces of the isotope ruthenium - 106 wafted across Europe.

Meyer, a chemist at University of North Carolina at Chapel Hill and director of its Energy Frontier Research Center in Solar Fuels, noticed that two separate groups of researchers working on two separate parts of the photosynthetic reaction happened to be using the same class of catalyst — ones with an atom of the metal ruthenium surrounded by organic molecules.

A research team led by the Department of Energy's Oak Ridge National Laboratory has confirmed magnetic signatures likely related to Majorana fermions — elusive particles that could be the basis for a quantum bit, or qubit, in a two - dimensional graphene - like material, alpha - ruthenium trichloride.

They found that argon restricts the number of molecules that adsorb onto the ruthenium surface.

In this case, they discovered that not all of the argon gets trapped in the cages — a small amount goes to the interface between the framework and ruthenium surface.

A new one - pot approach of conjugated tetraenes from 1,3 - butadiene and two substituted acetylenes catalyzed by a zero - valent ruthenium complex.

Through advanced molecular design, the Lund researchers have now successfully manipulated the electronic properties of iron - based molecules so that they much better resemble the ruthenium - based substances.

Although much progress has been made in recent years in the development of catalysts devoid of noble metals, photosensitizers still rely, in the main, on molecular compounds containing rare and costly metals, such as ruthenium and iridium, or on inorganic semiconductor materials containing cadmium, a toxic metal.

Ultrafast x-ray spectroscopy reveals electronic changes that occur during the oxidation of carbon monoxide on a ruthenium surface.

This system's performance is much higher than that obtained with a ruthenium - based photosensitizer, due to the very high stability of inorganic quantum dots, which can be recycled several times without notable loss of activity.

For 2 weeks in September and October last year, traces of the humanmade isotope ruthenium - 106 wafted across Europe, triggering detectors from Norway to Greece and Ukraine to Switzerland.

Working with Artur Ionescu of the Babes - Bolyai University in Cluj - Napoca, Romania, he has shown that ruthenium, a rare metal found in the igneous rocks beneath the site, can act as a catalyst, allowing methane to form in the lab at temperatures below 100 °C — similar to the temperatures at Yanartas (Geofluids, DOI: 10.1111 / gfl.12106).

11:30 Tommaso Giovannini: Implementation of Analytical Third Derivatives for a Fully Polarizable QM / classical Hamiltonian 11:50 Joachim O. Lindner: Accelerated Dynamics Simulations of Supramolecular Ruthenium - Based Water Oxidation Catalysis

For this work, he has used a number of ultra-high vacuum surface science techniques to, for example, identify and explain several very unusual mechanistic features of the heterogeneous chemistry occurring in a catalytic converter including: a) the dramatically different CO oxidation reaction mechanism on ruthenium metal relative to other late transition metals; b) the structure sensitive selectivity of the NO reduction reaction on rhodium metal; c) deactivation of rhodium metal at high oxygen partial pressures; and d) the significantly different CO oxidation reaction mechanism over oxidized rhodium metal.

The ruthenium dioxide is of interest because of its reactivity.