Observation of the fcc-to-hcp Transition in Ensembles of Argon Nanoclusters

Krainyukova, N. V.; Boltnev, R. E.; Bernard, E. P.; Khmelenko, V. V.; Lee, D. M.; Kiryukhin, V.

doi:10.1103/physrevlett.109.245505

Cited by 38 publications

(35 citation statements)

References 32 publications

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“…When the sample become "dry" (no liquid helium in the pores remains), the beaker containing the sample starts to warm up because of heat transfer from the atom source. The warm-up causes sublimation of "strongly bound helium" -helium adsorbed on the impurity nanocluster surface [17,20] and coalescence of the nanoclusters into microcrystals [10,21]. The sublimation of helium shells, which had prevented recombination of radicals trapped on the impurity nanoclusters also initiates chemical reactions, and the formation of excited species responsible for optical emission during the sample destruction.…”

Section: Resultsmentioning

confidence: 99%

Optical spectroscopy and current detection during warm-up and destruction of impurity–helium condensates

Krushinskaya

Boltnev

Bykhalo

et al. 2015

Low Temperature Physics

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New experimental results on detection of optical spectra and ion currents during destruction of impurity-helium condensates (IHCs) have been obtained. It is shown that emission during IHC sample destruction is accompanied by current pulses, pressure peaks and temperature changes. The molecular bands of excimer molecules XeO* are assigned to molecules stabilized in films of molecular nitrogen covering the heavier cores of impurity clusters which form impurity-helium condensates.

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Section: Resultsmentioning

confidence: 99%

Optical spectroscopy and current detection during warm-up and destruction of impurity–helium condensates

Krushinskaya

Boltnev

Bykhalo

et al. 2015

Low Temperature Physics

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“…Nevertheless, the model did not allow us to explain the photostimulated luminescence of IHC samples submerged in bulk He II. Moreover, the model was not confirmed by structural studies of IHCs revealed nanoclusters as building units of the condensates [10][11][12].…”

Section: "Cold" and "Hot" Thermoluminescence Spectra From Ihcsmentioning

confidence: 94%

“…1(a). While the jet transits the cold gas above the He II surface, impurity nanoclusters (with the characteristic size ~ 3-6 nm) form [12]. The nanoclusters penetrate through the superfluid surface and aggregate into an aerogel-like substance (Figs.…”

Section: Methodsmentioning

confidence: 99%

“…The nanoclusters penetrate through the superfluid surface and aggregate into an aerogel-like substance (Figs. 1(b) and 1(c)) with the impurity density of ~ 10 20 atom/cm 3 [10,12]. A spectrometer AvaSpec-ULS2048XL-USB2 allowed us to detect emission within the spectral range from 200 to 1160 nm with the resolution ≈2.5 nm.…”

Section: Methodsmentioning

confidence: 99%

“…Such particles and systems have found many different applications: visualization of flows and quantum vortices in superfluid helium [2][3][4]; study of energy transfer phenomena in liquid helium [5]; development of new high-energy density materials [6][7][8]; investigation of tunneling reactions of hydrogen isotopes in impurity-helium condensates [9]; structural studies of rare gas, molecular deuterium and nitrogen nanoclusters [10][11][12]; study of cold neutron interaction with watergels [13,14]; synthesis of metallic nanowires in superfluid helium [15,16]. Laser ablation of metallic target in solid helium-4 allows to create so-called icebergs (helium crystals doped with metallic particles) remaining metastable below the melting curve [17,18].…”

Section: Introductionmentioning

confidence: 99%

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On charged impurity structures in liquid helium

Pelmenev

Krushinskaya

Bykhalo

et al. 2016

Low Temperature Physics

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The thermoluminescence spectra of impurity-helium condensates (IHC) submerged in superfluid helium have been observed for the first time. Thermoluminescence of impurity-helium condensates submerged in superfluid helium is explained by neutralization reactions occurring in impurity nanoclusters. Optical spectra of excited products of neutralization reactions between nitrogen cations and thermoactivated electrons were rather different from the spectra observed at higher temperatures, when the luminescence due to nitrogen atom recombination dominates. New results on current detection during the IHC destruction are presented. Two different mechanisms of nanocluster charging are proposed to describe the phenomena observed during preparation and warmup of IHC samples in bulk superfluid helium, and destruction of IHC samples out of liquid helium.

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Crystal Phase Transition Creates a Highly Active and Stable RuC_X Nanosurface for Hydrogen Evolution Reaction in Alkaline Media

Kim

Ruqia

et al. 2021

Advanced Materials

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Although metastable crystal structures have received much attention owing to their utilization in various fields, their phase‐transition to a thermodynamic structure has attracted comparably little interest. In the case of nanoscale crystals, such an exothermic phase‐transition releases high energy within a confined surface area and reconstructs surface atomic arrangement in a short time. Thus, this high‐energy nanosurface may create novel crystal structures when some elements are supplied. In this work, the creation of a ruthenium carbide (RuCX, X < 1) phase on the surface of the Ru nanocrystal is discovered during phase‐transition from cubic‐close‐packed to hexagonal‐close‐packed structure. When the electrocatalytic hydrogen evolution reaction (HER) is tested in alkaline media, the RuCX exhibits a much lower overpotential and good stability relative to the counterpart Ru‐based catalysts and the state‐of‐the‐art Pt/C catalyst. Density functional theory calculations predict that the local heterogeneity of the outermost RuCX surface promotes the bifunctional HER mechanism by providing catalytic sites for both H adsorption and facile water dissociation.

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Observation of the fcc-to-hcp Transition in Ensembles of Argon Nanoclusters

Cited by 38 publications

References 32 publications

Optical spectroscopy and current detection during warm-up and destruction of impurity–helium condensates

Optical spectroscopy and current detection during warm-up and destruction of impurity–helium condensates

On charged impurity structures in liquid helium

Crystal Phase Transition Creates a Highly Active and Stable RuC_X Nanosurface for Hydrogen Evolution Reaction in Alkaline Media

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Observation of the fcc-to-hcp Transition in Ensembles of Argon Nanoclusters

Cited by 38 publications

References 32 publications

Optical spectroscopy and current detection during warm-up and destruction of impurity–helium condensates

Optical spectroscopy and current detection during warm-up and destruction of impurity–helium condensates

On charged impurity structures in liquid helium

Crystal Phase Transition Creates a Highly Active and Stable RuCX Nanosurface for Hydrogen Evolution Reaction in Alkaline Media

Contact Info

Product

Resources

About

Crystal Phase Transition Creates a Highly Active and Stable RuC_X Nanosurface for Hydrogen Evolution Reaction in Alkaline Media