Sentences with phrase «copper atoms»

This network, which is self - organizing under certain experimental conditions, contains so - called nano - beakers of copper atoms in which the noble gas atoms are held in place like a bird egg.

«We observed acceleration in the reactivity of the carbon - to - iodine bonds when those bonds were aligned along rows of copper atoms in the catalyst, as compared to the bonds aligned across the copper rows,» says Kelvin Anggara, a PhD candidate in Polanyi's research group and a lead author of the study.

The enzyme depends on a single copper atom at the core, which when properly positioned efficiently snatches electrons and gives them up to other atoms.

While the outermost electrons on adjacent copper atoms interact with one another strongly, they ordinarily stay locked in place, stuck in a «quantum mechanical traffic jam» with nowhere to go, Davis said.

The exciting thing about this series of mixed crystals is that nickel or copper atoms sit at what are referred to as tetragonal sites of the crystal structure.

Removing some of the electrons that reside on copper atoms results in electron vacancies known as holes.

Specifically, a metal - organic framework compound, copper [1,3 - benzenedicarboxylate] with a unique arrangement of copper atoms in a crystal, has been shown to exhibit this novel behavior.

Scientists have generally understood that the mechanism of superconductivity in copper oxide compounds depends on the ability of electrons on adjacent copper atoms to pair up.

For example, the bending of bulk copper (wire, ribbon, etc.) occurs with movement of copper atoms / clusters at about the 50 nm scale.

Tetrahedra with a nickel atom at their centre are somewhat elongated due to the Jahn - Teller effect (green), while the tetrahedrons with a copper atom at their centre are compressed (blue).

«Every bit consists of two positions on a surface of copper atoms, and one chlorine atom that we can slide back and forth between these two positions.

To create the same reactive geometry in their model catalyst, Stack and his graduate student Yadong Wang designed a set of organic arms — one called a phenol, the other binaphthol — that would bind to the copper atom and mimic the role of galactose oxidase's key amino acids.

Galactose oxidase achieves this configuration by forcing the copper atom to bind to five compounds — four amino acids and one water molecule — in a pyramid - shaped arrangement that keeps it a bit unsatisfied, looking for more action.

Called catenanes, the machines worked by rotating one of the rings relative to the other with the help of a copper atom that served as an on - switch.

But a single hole is hindered from moving along the sheet by the magnetic fields of the copper atoms.

Sometimes, an atom between the sheets will pluck an electron from a copper atom, leaving behind a positively charged «hole» that can hop from one copper atom to the next.

By carefully analyzing the reflected beam, the researchers detected stripes of holes lying along every eighth row of copper atoms, as they describe in the 4 March issue of Physical Review Letters.

They observed stripes of charge along every fourth row of copper atoms, they report in a paper posted on the Los Alamos preprint server.

«If the laser wavelength is long, then every electron spends a lot of time in the laser field before it returns to the copper atoms.

Atomic - scale computer simulation of a CBRAM cell subjected to 1mV voltage: electron trajectories (blue and red lines); copper atoms (grey); silicon and oxygen atoms (orange).

It consists of small clusters of four copper atoms each, supported on a thin film of aluminum oxide.

«All four copper atoms are participating because with only a few of them in the cluster, they are all exposed and able to bind.»

«The copper atoms along the rows were slightly closer together, by about the diameter of a single atom, than the atoms across the rows,» says Anggara.

The copper atoms provide the zeolite with a bluish color.

The group replaced the copper atoms in BSCCOthe sources of any paired electronswith zinc impurities sure to scatter the electrons.

The researchers placed the molecule on a crystalline copper surface, in which the copper atoms arrange themselves in a triangular array, like so many pennies snuggled side by side.

The sulfur atoms straddled two neighboring rows of copper atoms, as an ant's feet might straddle a pine needle.

(The electron density near each copper atom looks a bit like a daisy in the crystallized pattern.)

Each copper atom has a single, unpaired electron in its outermost energy shell, or orbital.

Researchers at Argonne National Laboratory have identified a new material to catalyze the conversion of CO2 via hydrogenation to methanol (CH3OH): size - selected Cu4 clusters — clusters of four copper atoms each, called tetramers — supported on Al2O3 thin films.

«The modeling helped the researchers gain understanding at the atomic level of how the copper atoms improve the catalyst, which helped in precisely choosing and tuning the elements to enhance performance,» said Beckman.