Sentences with phrase «metal atoms»

These structural aspects of metals would seem to imply the existence of metal atoms as a freestanding 2D material is unlikely.

The material is magnetic because it contains metal atoms that themselves act like tiny bar magnets.

Polymers, or plastics, which feature metal atoms in their structure have been a focus of much research in recent decades, and have found application in self - healing materials, photovoltaic technology, and information storage.

They're also a chemists» version of Tinkertoys, made with metal atoms at the corners and a wide variety of organic compounds that serve as the linkers in between.

MX2 monolayers consist of a single layer of transition metal atoms, such as molybdenum (Mo) or tungsten (W), sandwiched between two layers of chalcogen atoms, such as sulfur (S).

Fabrication of crystals from single metal atoms by Nicolas P. E. Barry, Anaïs Pitto - Barry, Ana M. Sanchez, Andrew P. Dove, Richard J. Procter, Joan J. Soldevila - Barreda, Nigel Kirby, Ian Hands - Portman, Corinne J. Smith, Rachel K. O'Reilly, Richard Beanland, & Peter J. Sadler.

The process bombards the faucet with charged metal atoms that bond to the surface.

Sometimes several metal atoms on magnetite form small clusters.

That calculation requires measuring the x-rays» intensity and determining their phase, the relative timing — a harder problem traditionally solved by comparing the diffraction pattern from a pure crystal with one from a similar crystal in which heavy metal atoms substitute for some components of the crystal.

Dr. Scott Chambers is a Laboratory Fellow and leads a research team focused on the properties of «designer» oxides — materials which combine different metal atoms with oxygen atoms into solid materials.

The networks assemble in a Tinkertoy - like fashion from metal atoms that act as the hubs and sticklike organic compounds that link the hubs together.

Flytzani - Stephanopoulos says the new research suggests single precious metal atoms stabilized with alkali ions may be the only important catalyst sites for other catalytic reactions.

«In essence,» said co-author Darren W. Johnson, a professor of chemistry, «we can prepare one type of nanoscale cluster compound, and then step - by - step substitute out the individual metal atoms to make new clusters that can not be made by direct methods.

The uniformity of SWNT diameter is attributed to the efficient annealing of an initial fullerene tubelet kept open by a few metal atoms; the optimum diameter is determined by competition between the strain energy of curvature of the graphene sheet and the dangling - bond energy of the open edge, where growth occurs.

«Working catalysts are not simple surfaces, but it's now possible to use molecular beam technology to place well - characterised clusters of metal atoms onto a surface», says Prest.

The distribution of nitrogen atoms after the dissociation allowed the identification of the «active sites» for this reaction, which are formed by the low - coordinated, top metal atoms of atomic steps.

One such family are materials called metal organic frameworks (MOFs), which are made up of metal atoms connected by organic linkers.

The growth of graphene on metal surfaces can be catalyzed by mobile surface metal atoms.

Atomic processes on the magnetite surface determine how well certain metal atoms can serve as catalysts for chemical reactions.

The classic high - surface - area material is powdered activated carbon, but other synthetic substances may offer even more promise, including high - porosity polymers and materials made of organo - metallic molecular «cages» — hydrocarbon frameworks enclosing metal atoms.

However, when the UCLA scientists added a second metal atom to the mix, a new molecule, BaOCa +, which no longer satisfied the octet rule, had been formed.

ULTRATHIN FILMS Computer simulations reveal the properties of a little - studied group of synthetic materials: 2 - D arrays of metal atoms arranged in honeycombs (illustrated), triangles or squares.

It is then possible to atomically resolve individual lithium metal atoms and their interface with the solid electrolyte interphase (SEI).

A new ultra-thin semiconducting material consists of three atomic layers in an «atomic sandwich» configuration with a heavy metal atom layer between two selenium layers.

The lifetime of catalysts that convert automotive exhaust pollutants can be increased by lowering their operating temperature, which helps to prevent deactivation caused by the active metal atoms agglomerating into larger, less active particles.

• Electrochemistry tunes graphene synthesis (Jul 2015) • Graphene growth substrate tailors metal atom magnetism (Oct 2014) • Transition metal surface stabilizes graphene edge structures (Jun 2014) • Surface steps tailor graphene growth at low pressure (Feb 2013)

Inefficient ones have precious metal atoms balled up in clumps, with the interior atoms unavailable to do their job on incoming molecules.

Metal - labelled single cells are introduced into an inductively - coupled plasma torch to generate an ion cloud that is then analyzed by time - of - flight mass spectroscopy, allowing the composition and abundance of cell - associated metal atoms to be ascertained.

The experiments showed the maximum magnetic anisotropy energy of a single atom (~ 60 millielectron volts) and the longest spin lifetime for a single transition metal atom.

MARS»S atmosphere harbours layers of electrically charged metal atoms, and they aren't behaving as expected.

So, Rao's team carried out systematic computer calculations to see whether adding different metal atoms to the GST mix would help stabilize nuclei at the elevated temperatures that take place during the phase switching.

But on an atomic scale, it has remarkable properties: on magnetite, single metal atoms are held in place, or they can be made to move across the surface.

Previous experiments at SLAC have used heavy metal atoms or sulfur as a marker for phasing.

«We could then relate this to the structural and compositional characteristic of the nanoclusters, like size, number of metal atoms, and number of ligands.

For example, the presence of hydrogen and methane are clues that the chemical environment of the fluid in which the diamond crystallized was one in which the metal atoms could easily gain electrons and disengage from carbon atoms.

A ligand is a molecule that binds to metal atoms to form metal cores that are stabilized by a shell of ligands, and so understanding how they contribute to nanoparticle stabilization is essential to any process of nanoparticle application.

Ti (3) SiC (2) was the first MAX phase Drexel researchers tried to selectively etch in 2011, but synthesis failed using hydrofluoric acid alone because the silicon atoms are strongly bound to the adjacent transition metal atoms.

Seeking such a strategy, researchers at Northwestern University in Evanston, Illinois, created an organic ring - shaped molecule with four metal atoms: two zincs and two rhodiums.

This latest study looked at how the soft element arsenic interacts with thorium, because arsenic could in principle be used in organic molecules that bond to metal atoms and improve extraction processes.

The cathode material in lithium batteries is typically «ordered,» meaning the lithium and transition metal atoms are arranged in neat layers, allowing lithium to move in and out of the layers.

«But a large cluster of many metal atoms may have completely different chemical properties than single metal atoms sitting separately on a surface.

Organic molecules equipped with functional groups to express distinct linkages to metal atoms were deposited onto a smooth silver substrate under vacuum conditions.

In recent years researchers have achieved better performance with compounds such as lithium borohydride, in which the metal atoms form weaker, ionic bonds with groups containing several hydrogen atoms.

The signals from the metal atoms provide reference points from which the phase of the other x-rays can be worked out.

High temperatures are required, however, because the metal atoms grip the hydrogen with strong covalent bonds.

Surprisingly, it is unclear what happens when an X-ray is absorbed, for example, in biological tissue consisting of water, biomolecules and some metal atoms.

The lens manufacturer Nion Co. in Kirkland, Washington, has found a way to tighten the beam so that atoms situated behind other atoms are clearly visible, as are heavy - metal atoms that were previously undetectable.

If a break - even mode were chosen, the only additional fuel a nuclear plant would need would be a periodic infusion of depleted uranium (uranium from which most of the fissile uranium 235 has been removed) to replace the heavy - metal atoms that have undergone fission.