Nanocrystalline magnetic materials obtained by flash annealing

Murakami, R.K.; Villas-Boas, Valquı́ria

doi:10.1590/s1516-14391999000200005

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…FJH has been known in the literature for many decades but was more recently applied to the synthesis of graphene. [ 127–129 ] Most notably, rapid Joule heating has been reported in the sintering of ceramics for more than a decade, where current is passed through a lightly conductive compacted powder, internally generating heat. [ 130,131 ] This heat generation, more than 1000 K min −1 , results in sintering of the ceramic or glass much more rapidly and efficiently than through the use of a furnace.…”

Section: Flash Joule Heatingmentioning

confidence: 99%

Large‐Scale Syntheses of 2D Materials: Flash Joule Heating and Other Methods

2022

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In the past 17 years, the larger‐scale production of graphene and graphene family materials has proven difficult and costly, thus slowing wider‐scale commercial applications. The quality of the graphene that is prepared on larger scales has often been poor, demonstrating a need for improved quality controls. Here, current industrial graphene synthetic and analytical methods, as well as recent academic advancements in larger‐scale or sustainable synthesis of graphene, defined here as weights more than 200 mg or films larger than 200 cm2, are compiled and reviewed. There is a specific emphasis on recent research in the use of flash Joule heating as a rapid, efficient, and scalable method to produce graphene and other 2D nanomaterials. Reactor design, synthetic strategies, safety considerations, feedstock selection, Raman spectroscopy, and future outlooks for flash Joule heating syntheses are presented. To conclude, the remaining challenges and opportunities in the larger‐scale synthesis of graphene and a perspective on the broader use of flash Joule heating for larger‐scale 2D materials synthesis are discussed.

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Section: Flash Joule Heatingmentioning

confidence: 99%

Large‐Scale Syntheses of 2D Materials: Flash Joule Heating and Other Methods

2022

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“…These authors showed that when a spin-density wave (SDW) coexists with spin-singlet Cooper-pair superconductivity among the same electrons, a non-zero spin-triplet amplitude must appear. Recently a similar problem was studied by Murakami and Fukuyama [14,15] by invoking the g-ology diagrams in one-dimensional electron system. But in the above two works the authors did not study the condition of appearance of the spin-triplet amplitude and its robustness.…”

mentioning

confidence: 99%

Mean-field study of the interplay between antiferromagnetism andd-wave superconductivity

Kyung

2000

Phys. Rev. B

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The interplay between antiferromagnetism and d-wave superconductivity is studied in a meanfield approximation for a generic microscopic Hamiltonian with short-range repulsion and nearneighbor attraction. In the presence of competing microscopic interactions, the phase boundaries of antiferromagnetic and superconducting states are significantly modified in some region of the doping-temperature plane. The transition between superconductivity and antiferromagnetism occurs through a phase where both order parameters coexist with a third, dynamically generated, spin-triplet amplitude. This dynamical generation of a new order parameter is not restricted to a system with antiferromagnetism and d-wave superconductivity, but is a generic feature for fermionic systems. The dynamically generated spin-triplet order parameter is found to be robust to variations in the mean-field Hamiltonian.

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“…The rapid heating and quenching rates of Joule heating could limit the phase separation or the atom diffusion and agglomeration during synthesis and afford extremely high temperatures to form strong interaction between the metal atoms and the substrate. Joule heating has been researched for many decades but has only recently been applied to the synthesis of ultrafine nanoparticles [59,60], high-entropy alloys [43], and SACs [25,52,53,55,[61][62][63].…”

Section: Joule Heatingmentioning

confidence: 99%

Ultrafast synthetic strategies under extreme heating conditions toward single-atom catalysts

He¹,

Yan²,

Gong³

et al. 2022

Int. J. Extrem. Manuf.

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The atomic dispersion of metal atoms on substrates provides an ideal method to maximize metal utilization efficiency, which is important for the production of cost-effective catalysts and the atomic-level control of the electronic structure. However, due to the high surface energy, individual single atoms tend to migrate and aggregate into nanoparticles during preparation and catalytic operation. In the past few years, various synthetic strategies based on ultrafast thermal activation toward the effective preparation of single-atom catalysts (SACs) have emerged, which could effectively solve the aggregation issue. Here, we highlight and summarize the latest developments in various ultrafast synthetic strategy with rapid energy input by heating shockwave and instant quenching for the synthesis of SACs, including Joule heating, microwave heating, solid-phase laser irradiation, flame-assisted method, arc-discharge method and so on, with special emphasis on how to achieve the uniform dispersion of single metal atoms at high metal loadings as well as the suitability for scalable production. Finally, we point out the advantages and disadvantages of the ultrafast heating strategies as well as the trends and challenges of future developments.

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Nanocrystalline magnetic materials obtained by flash annealing

Cited by 10 publications

References 16 publications

Large‐Scale Syntheses of 2D Materials: Flash Joule Heating and Other Methods

Large‐Scale Syntheses of 2D Materials: Flash Joule Heating and Other Methods

Mean-field study of the interplay between antiferromagnetism andd-wave superconductivity

Ultrafast synthetic strategies under extreme heating conditions toward single-atom catalysts

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