Sentences with phrase «of oxide surfaces»

Materials Research Society 2000 Fall Meeting Symposium on Structure - Property Relationships of Oxide Surfaces and Internal Interfaces

His current research programs address numerous aspects of the physical and chemical properties of oxide surfaces.

These include fundamental experimental studies of the geometric and electronic structure of oxide surfaces, as well as more applied studies that are developing oxides as catalytic materials.

The latter act as coordinatively unsaturated sites — a hypothesis introduced long ago to account for the catalytic activity of oxide surfaces — onto which carbon monoxide can chemisorb and from where it can react with neighboring lattice - oxygen to carbon dioxide.

The other strategy is based on different elements, including niobium, that propel hydrogen out of the oxide surface and protect the underlying zirconium alloy.

Not exact matches

KALONGWE ORE Kalongwe hosts a near - surface resource of 302 000 t copper and 42 000 t cobalt as predominantly oxide ore

with the possibility of oxide mineralization to be found closer to surface than the original intercept.

By: Robyn Wilkinson 4th November 2016 There is an increasing investment trend involving near - surface, easily mined base metal oxide deposits in Africa that can generate early cash flow amid current commodity prices to fund further exploration of the deposit at a later stage, advances specialist consultant to the mining industry The... →

SHORT - TERM FOCUS Oxidised near - surface deposits, such as high - grade secondary copper mineralisation in the oxide zone of Zambian copper deposits, are drawing investor interest

«That's due to the amount of oxide produced — a small amount lowers the surface tension, but too much forms a crust over the metal and stops it spreading.

Since the reaction produces nitrous oxide with a specific isotopic signature, Joye says: «This could be an easy way to «sniff» around the surface of Mars looking for pockets of subsurface brine that might be hotspots for extreme microbial life.»

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

«This work suggests that not only does the formation of the oxide lower the surface tension of the liquid metal, but that it also creates compressive stresses — the opposite of tension — that help the metal spread out and form fractals,» Dickey says.

«Applying voltage to EGaIn forms a thin layer of oxide on the surface of the metal, which effectively lowers the surface tension,» Dickey says.

«Because neutron spectroscopy could «see» hydrogen due to its large neutron scattering cross-section, it succeeded where optical spectroscopy techniques failed and enabled the first direct observations of cerium hydrides both on the surface and in the bulk of a cerium oxide catalyst,» Wu said.

Shirley Meng, a professor at UC San Diego's Department of NanoEngineering, added, «This beautiful study combines several complementary tools that probe both the bulk and surface of the NMC layered oxide — one of the most promising cathode materials for high - voltage operation that enables higher energy density in lithium - ion batteries.

«Breaking down metal oxide into tiny particles increases its surface area and exposes lots of ultra-small, interconnected grain boundaries that become active sites for the water - splitting catalytic reaction,» Cui said.

One of the unexpected consequences of the October 28 flare was a fivefold increase in ozone - destroying nitric oxide at 70 miles above Earth's surface.

We've always called Mars the Red Planet, but Curiosity showed us, for the first time, that it's not red — there's just a layer of reddish iron oxide on its surface.

Using samples of first zinc oxide and later calcium carbonate, Fischer made maps that showed every dip and rise on the surface of crystal to a resolution of 1 nanometer or one - billionth of a meter.

The scientists also found that the discontinuous nature of the nano - islands along with the interfacial oxide modified the electronic properties of the silicon surface and improved its solar performance.

The work also explains how the electric charges that accumulate on the surface of liquid metal droplets, together with their oxide skin, can be manipulated and used.

Their first trick is to roughen the surface of the cartridge by dipping it in a solution of aluminium oxide and urea.

«One of the developments that makes our fabrication process innovative is that we deposited yttrium oxide (Y2O3) insulator directly onto the surface of the diamond [to form the gate],» said Liu.

«We added the yttrium oxide to the diamond with a technique known as electron beam evaporation, which involves using a beam of electrons to transform molecules of yttrium oxide from the solid state to the gaseous state so that they can be made to cover a surface and solidify on it.»

Monico also used high - powered X-rays to analyse microscopic samples from the painting and found that some of the lead chromate at the painting's surface had turned into greenish chromium oxide, which combined with the underlying yellow to produce a darker and browner hue than van Gogh may have intended.

Here we report an iridium oxide / strontium iridium oxide (IrOx / SrIrO3) catalyst formed during electrochemical testing by strontium leaching from surface layers of thin films of SrIrO3.

This catalyst has demonstrated specific activity at 10 milliamps per square centimeter of oxide catalyst (OER current normalized to catalyst surface area), with only 270 to 290 millivolts of overpotential for 30 hours of continuous testing in acidic electrolyte.

Meanwhile, Aharon Kapitulnik and colleagues at Stanford University in Palo Alto, California, used a scanning tunneling microscope to study the crystal surface of bismuth strontium calcium copper oxide.

In their approach, they discovered that germanium nanowires are grown by the reduction of germanium oxide particles and subsequent self - catalytic growth during the thermal decomposition of natural gas, and simultaneously, carbon sheath layers are uniformly coated on the nanowire surface.

For years he has been studying the behaviour of tiny particles on metal - oxide surfaces together with Professor Ulrike Diebold (both TU Vienna).

In recent years, the have presented important new findings about the structure of metal oxides, about the mobility of atoms on their surface and their chemical properties.

Matula says this sudden illumination happens because during the first bout of sonoluminescence, temperatures in the bubble, which can be as high as several hundred thousand degrees — hotter than the sun's surface — do something to nitrogen and oxygen to make them form compounds such as nitrous oxide that dissolve in the surrounding water.

At the Vienna University of Technology, it has now been possible to selectively switch individual oxygen molecules sitting on a titanium oxide surface between a non-reactive to a reactive state using a special force microscope.

In the experiments, oxygen molecules were studied on the surface of a titanium oxide crystal at extremely low temperatures.

In all of these applications, particle size is critical to the utility and function of oxide nanoparticles — decreased particles size results in increased surface area, which can significantly improve the performance of the oxide nanoparticle.

The same process also happens when the surface of the titanium oxide is irradiated with light — electrons are liberated inside the material, and can come to the surface to activate one of the oxygen molecules.

The work builds on research, published in Science last year, in which the Wang and Datye groups found a novel way to trap and stabilize individual platinum atoms on the surface of cerium oxide, a commonly used component in emissions control catalysts.

Kepler - 13Ab's strong surface gravity — six times greater than Jupiter's — then pulls the titanium oxide snow out of the upper atmosphere and traps it in the lower atmosphere on the nighttime side of the planet.

Yamaguchi believes that deuterium ions migrate towards the palladium oxide surface of the plate because of differences in temperature and density.

First, the surface charge on a particle of magnetite (a form of iron oxide) depends on the pH of the solution surrounding it: below pH 6 it is positive, and above it is negative.

Starting with a substrate of indium tin oxide, the researchers used light - activated chemistry to pinpoint specific locations on the surface for polymer growth.

A microlayer of oxides then formed on the two surfaces, gluing them together.

Researchers at Umeå University, together with researchers at Uppsala University and Stockholm University, show in a new study how nitrogen doped graphene can be rolled into perfect Archimedean nano scrolls by adhering magnetic iron oxide nanoparticles on the surface of the graphene sheets.

For example, oxygen can react with iron on the surface of a planet to make iron oxides; this is what gives most red rocks their color.

The researchers opted for aluminum oxide (Al2O3) since it can form immediately on any kind of surface.

Natterer and colleagues created the minuscule magnetic bits using atoms of holmium deposited on a surface of magnesium oxide.

The nano - catalyst filter uses a technology that decomposes elements of cigarette smoke using oxygen radical, which is generated by decomposing ozone in the air on the surface of the manganese - oxide - based nano - catalyst filter.

«Scrutinizing the tip of molecular probes: Nature of interaction of probe molecules on the surface of oxide particles elucidated.»

The authors used data from infrared spectroscopy and thermogravimetry to identify the strength of the interaction between the probe and the oxide surface, which also helped them determine the type of bonding to the surface.