The role of vortices in the process of impurity nanoparticles coalescence in liquid helium

Гордон, Е. Б.; Karabulin, A. V.; Matyushenko, V. I.; Sizov, V. D.; Khodos, I. I.

doi:10.1016/j.cplett.2011.11.020

Cited by 43 publications

(33 citation statements)

References 15 publications

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“…Efficient cooling is guaranteed if the He remains ARTICLE liquid around the clusters and does not form a gaseous layer that would reduce heat dissipation. This condition is still fulfilled for the present cluster size but this could change for even larger clusters 25 . We can also observe that the structure of the nanoparticle does not change significantly between Au-rich and Ag-rich regions.…”

Section: Resultsmentioning

confidence: 90%

“…Discussion 3D information from the final state of the cluster on the substrate can now be linked to the growth and deposition process. From simulations 24 and considerations of the binding energy 25 , it is known that high temperatures or even partial melting during cluster-cluster collisions within the helium droplet and deposition on the substrate can occur on a very short timescale (few picoseconds). The fact, however, that the double core structure survives aggregation and deposition, and does not form an alloy as expected in a melt 26 , implies efficient cooling by the matrix and restricts melting processes to the contact region.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Formation of bimetallic clusters in superfluid helium nanodroplets analysed by atomic resolution electron tomography

Haberfehlner

Thaler

Knez

et al. 2016

European Microscopy Congress 2016: Proceedings

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Structure, shape and composition are the basic parameters responsible for properties of nanoscale materials, distinguishing them from their bulk counterparts. To reveal these in three dimensions at the nanoscale, electron tomography is a powerful tool. Advancing electron tomography to atomic resolution in an aberration-corrected transmission electron microscope remains challenging and has been demonstrated only a few times using strong constraints or extensive filtering. Here we demonstrate atomic resolution electron tomography on silver/gold core/shell nanoclusters grown in superfluid helium nanodroplets. We reveal morphology and composition of a cluster identifying gold-and silver-rich regions in three dimensions and we estimate atomic positions without using any prior information and with minimal filtering. The ability to get full three-dimensional information down to the atomic scale allows understanding the growth and deposition process of the nanoclusters and demonstrates an approach that may be generally applicable to all types of nanoscale materials.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Formation of bimetallic clusters in superfluid helium nanodroplets analysed by atomic resolution electron tomography

Haberfehlner

Thaler

Knez

et al. 2016

European Microscopy Congress 2016: Proceedings

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“…20. The equilibrium configurations of vortex arrays in rotating superfluid helium were computed in Refs.…”

Section: Introductionmentioning

confidence: 99%

Vortex arrays in a rotating superfluidHe4nanocylinder

2014

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Within Density Functional theory, we investigate stationary many-vortex structures in a rotating 4 He nanocylinder at zero temperature. We compute the stability diagram and compare our results with the classical model of vortical lines in an inviscid and incompressible fluid. Scaling the results to millimeter-size buckets, they can be compared with experiments on vortex arrays conducted in the past. Motivated by recent experiments that have used atomic impurities as a means of visualizing vortices in superfluid 4 He droplets, we have also considered the formation of chains of xenon atoms along a vortex line and the interaction between xenon atoms inside the same vortex and on different neighboring vortex lines.PACS numbers: 67.25. D-, 67.25.dk

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“…The quality of the nanowires is quite reasonable, as they are formed by fusion in the quantized vortex core of nanoclusters being molten at the moment of their nucleation by the atom condensation [18]. The diameter of the nanowires formed by this technique is determined mainly by the thermal characteristics of the metal [17] and it ranges from about 7 to 8 nm for fusible metals to as small as 3-4 nm for refractory metals [17,19,20].…”

Section: Methodsmentioning

confidence: 99%

Suppression of superconductivity in thin Nb nanowires fabricated in the vortex cores of superfluid helium

Гордон

Bezryadin

Karabulin

et al. 2015

Physica C: Superconductivity and its Applications

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a b s t r a c tNanowires of niobium, platinum and indium-lead In 88 Pb 12 alloy with diameters of 4.2, 3.6 and 8 nm, respectively, were grown in quantized vortices of superfluid helium, and the dependences of their resistance on temperature have been studied. Through a detailed comparison of these dependences we present evidence that superconducting niobium wires allow a high rate of quantum phase slip. This phase slippage leads to a phase transition to an insulating state at T ? 0.

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The role of vortices in the process of impurity nanoparticles coalescence in liquid helium

Cited by 43 publications

References 15 publications

Formation of bimetallic clusters in superfluid helium nanodroplets analysed by atomic resolution electron tomography

Formation of bimetallic clusters in superfluid helium nanodroplets analysed by atomic resolution electron tomography

Vortex arrays in a rotating superfluidHe4nanocylinder

Suppression of superconductivity in thin Nb nanowires fabricated in the vortex cores of superfluid helium

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