Production of metal nanoparticles from aqueous solutions in the arc plasma

Orlov, A. M.; Yavtushenko, I. O.; Bodnarskii, D. S.; Ufarkina, N. V.

doi:10.1134/s1063784213090211

Cited by 9 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A recent noteworthy development is the demonstration of ELM suppression with less than a full complement of control coils in DIII-D [86]. A previous study demonstrated suppression with a single row of internal coils [60]; in this study, coils were deactivated in a pseudo-random manner and ELM suppression was demonstrated with as few as 5 active coils out of the normal set of 12 internal coils.…”

Section: Elm Suppression With Rmpmentioning

confidence: 74%

Enhanced confinement scenarios without large edge localized modes in tokamaks: control, performance, and extrapolability issues for ITER

Maingi¹

2014

Nucl. Fusion

View full text Add to dashboard Cite

Large edge localized modes (ELMs) typically accompany good H-mode confinement in fusion devices, but can present problems for plasma facing components because of high transient heat loads. Here the range of techniques for ELM control deployed in fusion devices is reviewed. Two strategies in the ITER baseline design are emphasized: rapid ELM triggering and peak heat flux control via pellet injection, and the use of magnetic perturbations to suppress or mitigate ELMs. While both of these techniques are moderately well developed, with reasonable physical bases for projecting to ITER, differing observations between multiple devices are also discussed to highlight the needed community R&D. In addition, recent progress in ELM-free regimes, namely quiescent H-mode, I-mode, and enhanced pedestal H-mode is reviewed, and open questions for extrapolability are discussed. Finally progress and outstanding issues in alternate ELM control techniques are reviewed: supersonic molecular beam injection, edge electron cyclotron heating, lower hybrid heating and/or current drive, controlled periodic jogs of the vertical centroid position, ELM pace-making via periodic magnetic perturbations, ELM elimination with lithium wall conditioning, and naturally occurring small ELM regimes.

show abstract

Section: Elm Suppression With Rmpmentioning

confidence: 74%

Enhanced confinement scenarios without large edge localized modes in tokamaks: control, performance, and extrapolability issues for ITER

Maingi¹

2014

Nucl. Fusion

View full text Add to dashboard Cite

show abstract

“…The magnetic nano/micro-powders can be used in the manufacturing of strong magnets using fabrication processes, such as spark plasma sintering [16], laser based additive manufacturing [7,17,18] and Selective Laser Melting (SLM) [10]. We planned to use laser heat treatments of SmCo5 powders in order to make miniature strong magnets and we previously reported [19] the magnetization studies of SmCo5 nanoparticles synthesized using aqueous plasma techniques [20,21]. As-synthesized particles exhibited oxidation and gave poor magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Magnetization and XRD Studies of Laser Heat Treated SmCo<sub>5</sub> Powders

Seetala

Henderson

Jno-Baptiste

et al. 2021

MSF

View full text Add to dashboard Cite

The microstructure and magnetization of SmCo5 micro-particles may be used as feedstock for 3D printing to make miniature strong magnets. Thus, the magnetic response and microstructures of commercially available SmCo5 micro-particles were studied under various heat treatments using a high wattage laser. The magnetization of laser heat treated powders at 50-watt showed an increase in magnetization, while the 75-watt melt showed a little to no change. Unfortunately, the coercivity of both laser heat treated samples decreased significantly. Oxidation during the heat treatment is suspected to result in low coercivity. Purging with argon-gas prior to laser heating showed improved coercivity. To further minimize the oxidation problem a set of SmCo5 powder was reduced prior to laser heat treatment using a constant flow of hydrogen gas while being heated at various temperatures from 100 oC to 400 oC for a period of ~4 hours. The results show that the magnetization generally increases with the temperature, while the coercivity decreases significantly. Another set of SmCo5 was annealed in a vacuum furnace for one hour at temperatures between 200 oC and 400 oC in order to confirm that no hydride phases were formed during reduction. The magnetization and coercivity showed similar variations with annealing temperature to those for the reduced powders confirming that these variations may be due to change in crystal structure rather than formation of hydrides. X-ray Diffraction (XRD) studies were performed to identify the changes in crystal phases.

show abstract