Robust Ferromagnetism of Chromium Nanoparticles Formed in Superfluid Helium.
Sign Up to like & getrecommendations! Published in 2017 at "Advanced materials"
DOI: 10.1002/adma.201604277
Abstract: Chromium nanoparticles are formed using superfluid helium droplets as the nanoreactors, which are strongly ferromagnetic. The transition from antiferromagentism to ferromagnetism is attributed to atomic-scale disorder in chromium nanoparticles, leading to abundant unbalanced surface spins.… read more here.
Keywords: chromium; superfluid helium; ferromagnetism; chromium nanoparticles ... See more keywords
Numerical Studies of Quantum Turbulence
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Low Temperature Physics"
DOI: 10.1007/s10909-017-1789-8
Abstract: We review numerical studies of quantum turbulence. Quantum turbulence is currently one of the most important problems in low temperature physics and is actively studied for superfluid helium and atomic Bose–Einstein condensates. A key aspect… read more here.
Keywords: quantum turbulence; turbulence; studies quantum; superfluid helium ... See more keywords
Design optimization, construction and testing of 2 K Joule-Thomson heat exchanger for a superfluid helium cryogenic system
Sign Up to like & getrecommendations! Published in 2020 at "Applied Thermal Engineering"
DOI: 10.1016/j.applthermaleng.2020.115774
Abstract: Abstract The performances of 2 K Joule–Thomson (J-T) heat exchanger are related to the operation efficiency and economy of the superfluid helium cryogenic system, and the helically finned-tube heat exchanger (HFHE) is designed and tested. Heat… read more here.
Keywords: helium cryogenic; heat exchanger; cryogenic system; superfluid helium ... See more keywords
Refrigeration of an array of cylindrical nanosystems by superfluid helium counterflow
Sign Up to like & getrecommendations! Published in 2017 at "International Journal of Heat and Mass Transfer"
DOI: 10.1016/j.ijheatmasstransfer.2016.08.019
Abstract: Abstract Motivated by the challenge of computer refrigeration, we study the limits set by the transition to quantum turbulence on the cooling of an array of heat-producing cylindrical nanosystems by means of superfluid-helium counterflow. The… read more here.
Keywords: helium counterflow; cylindrical nanosystems; refrigeration; superfluid helium ... See more keywords
Dynamics of vapour bubbles induced during the boiling of superfluid helium under microgravity conditions
Sign Up to like & getrecommendations! Published in 2019 at "International Journal of Heat and Mass Transfer"
DOI: 10.1016/j.ijheatmasstransfer.2019.01.097
Abstract: Abstract The presented research aims to establish a theoretical framework for the analysis of the transient behaviour of vapour bubbles resulting from superfluid helium boiling under the conditions of microgravity. As long as the volume… read more here.
Keywords: microgravity; helium; superfluid helium; dynamics vapour ... See more keywords
Non-equilibrium thermodynamics, heat transport and thermal waves in laminar and turbulent superfluid helium
Sign Up to like & getrecommendations! Published in 2017 at "Physics Reports"
DOI: 10.1016/j.physrep.2017.10.004
Abstract: Abstract This review paper puts together some results concerning non equilibrium thermodynamics and heat transport properties of superfluid He II. A one-fluid extended model of superfluid helium, which considers heat flux as an additional independent… read more here.
Keywords: thermodynamics; transport; superfluid helium; heat ... See more keywords
Superfluid helium droplet-mediated surface-deposition of neutral and charged silver atomic species
Sign Up to like & getrecommendations! Published in 2023 at "Physical Chemistry Chemical Physics"
DOI: 10.1039/d3cp01303k
Abstract: Experimental and theoretical work has delivered evidence on the helium nanodroplet-mediated synthesis and soft-landing of metal nanoparticles, nanowires, clusters, and single atoms on solid supports. Recent experimental advances have allowed... read more here.
Keywords: droplet mediated; surface deposition; helium droplet; superfluid helium ... See more keywords
Particle dynamics in wall-bounded thermal counterflow of superfluid helium
Sign Up to like & getrecommendations! Published in 2017 at "Physics of Fluids"
DOI: 10.1063/1.4984913
Abstract: The motions of relatively small particles in wall-bounded thermal counterflow of superfluid helium are experimentally investigated, above 1 K, by using the particle tracking velocimetry technique. The effect of a solid boundary on this quantum… read more here.
Keywords: wall bounded; counterflow superfluid; bounded thermal; wall ... See more keywords
Ultrafast nonequilibrium dynamics of rotons in superfluid helium.
Sign Up to like & getrecommendations! Published in 2022 at "Proceedings of the National Academy of Sciences of the United States of America"
DOI: 10.1073/pnas.2303231120
Abstract: Short-time dynamics of superfluids far from equilibrium remains largely unknown, despite its importance for key processes in these systems. Here, we describe a method for locally perturbing the density of superfluid helium via the excitation… read more here.
Keywords: ultrafast nonequilibrium; superfluid helium; nonequilibrium dynamics; roton pairs ... See more keywords
Infrared spectroscopy in superfluid helium droplets
Sign Up to like & getrecommendations! Published in 2018 at "Advances in Physics: X"
DOI: 10.1080/23746149.2018.1553569
Abstract: ABSTRACT For more than two decades, encapsulation in superfluid helium nanodroplets has served as a reliable technique for probing the structure and dynamics of molecules and clusters at a low temperature of ≈0.37 K. Due… read more here.
Keywords: infrared spectroscopy; spectroscopy superfluid; superfluid helium; spectroscopy ... See more keywords
Dynamics of the Vortex-Particle Complexes Bound to the Free Surface of Superfluid Helium.
Sign Up to like & getrecommendations! Published in 2019 at "Physical review letters"
DOI: 10.1103/physrevlett.122.174502
Abstract: We present an experimental and theoretical study of the 2D dynamics of electrically charged nanoparticles trapped under a free surface of superfluid helium in a static vertical electric field. We focus on the dynamics of… read more here.
Keywords: superfluid helium; surface superfluid; free surface; surface ... See more keywords