High thermal stability of carbon-coated L10-FePt nanoparticles prepared by salt-matrix annealing

Rong, Chuanbing; Poudyal, Narayan; Chaubey, Girija S.; Nandwana, Vikas; Liu, Yuzi; Wu, Yaqiao; Kramer, M. J.; Kozlov, Mikhail E.; Baughman, Ray H.; Liu, J. Ping

doi:10.1063/1.2832506

Cited by 40 publications

(25 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this work, we focus on a different approach in the same vein, which consists of annealing of the FePt NPs in a matrix of NaCl powder. This method has been reported to efficiently prevent particles from sintering 15–17. As compared to the oxide shell growth, salt matrix annealing exhibits a higher potential to be scaled up to larger quantities due to its simplicity of realization.…”

Section: Methodsmentioning

confidence: 99%

Selective Production of 1,2‐Propylene Glycol from Jerusalem Artichoke Tuber using Ni–W₂C/AC Catalysts

Zhou

Wang

et al. 2012

ChemSusChem

View full text Add to dashboard Cite

A series of Ni-promoted W(2) C/activated carbon (AC) catalysts were investigated for the catalytic conversion of Jerusalem artichoke tuber (JAT) under hydrothermal conditions and hydrogen pressure. Even a small amount of Ni could greatly promote the conversion of JAT to 1,2-propylene glycol (1,2-PG), whereas the pure W(2) C/AC catalyst resulted in the selective formation of acetol. The product distribution profiles involving the reaction temperature, time, and H(2) pressure indicated that 1,2-PG formed as a result of acetol hydrogenation, which was catalyzed by Ni. Thus, there was a synergy between W(2) C and Ni, and the best performance yielded 38.5% of 1,2-PG over a 4%Ni-20%W(2) C/AC catalyst at 245°C, 6 MPa H(2) , and 80 min. To understand the reaction process, some important intermediates, such as inulin, fructose, acetol, glyceraldehyde, and 1,3-dihydroxyacetone, were used as the feedstock. Based on the product distributions derived from these intermediates, a reaction pathway was proposed, where JAT was first hydrolyzed into a mixture of fructose and glucose under the catalysis of H(+) , then the sugars underwent a retro-aldol reaction followed by hydrogenation catalyzed by Ni-W(2) C.

show abstract

Section: Methodsmentioning

confidence: 99%

Selective Production of 1,2‐Propylene Glycol from Jerusalem Artichoke Tuber using Ni–W₂C/AC Catalysts

Zhou

Wang

et al. 2012

ChemSusChem

View full text Add to dashboard Cite

show abstract

“…This may be attributed to the decomposition of the surfactants, as also reported in [17] and [18]. There is also indirect evidence that the broad peak was not observed in the DSC curve of the 500…”

Section: B Phase Transformation and Magnetic Hardening In Isolated Fmentioning

confidence: 63%

“…Development of Isolated L1 0 FePt Nanoparticles Our previous study showed that carbon-coated FePt particles were formed by annealing the salt-surfactant-particle mixtures, as a consequence of decomposition of the surfactants into carbon [17]. The carbon coating makes the FePt particles highly thermally stable.…”

Section: Resultsmentioning

confidence: 99%

Phase Transformation and Magnetic Hardening in Isolated FePt Nanoparticles

Rong

Nandwana

Poudyal

et al. 2009

IEEE Trans. Nanotechnology

View full text Add to dashboard Cite

Abstract-Isolated monodisperse L1 0 FePt nanoparticles coated by carbon were obtained by adding enough surfactants that decomposed into carbon after the chemical synthesis and postannealing of the A1 FePt nanoparticles. The effect of isolation between FePt nanoparticles on the phase transition temperature and magnetic properties has been studied systematically by thermal, magnetic, and structural characterizations and analyses. It was found that the A1 to L1 0 phase transition temperature is dependent sensitively on the amount of isolation medium. The transition temperature shift reaches 150-200• C from nonisolated particle assemblies to completely isolated particles, which may be attributed to the high activation energy of the phase transformation for the isolated particles.

show abstract

“…To avoid this aggregation/sintering problem, FePt nanoparticles are either coated with SiO 2 [186,187], or grinded with a large excess of NaCl [188,189] before high temperature annealing is applied. In the SiO 2 coated FePt, the conversion to the fct-FePt could be seen only above 600-700°C the uncoated nanoparticles began the structure transformation at 550°C [165].…”

Section: Synthesis Of Dispersible Fct-fept Nanoparticlesmentioning

confidence: 99%

Chemical Synthesis, Self-Assembly and Applications of Magnetic Nanoparticles

Peng

Kim

Sun

2009

Annual Review of Nano Research

View full text Add to dashboard Cite

This chapter reviews recent advances in chemical synthesis, selfassembly, and applications of novel magnetic nanomaterials in the past few years. The chemical syntheses of several important classes of magnetic nanoparticles are covered, including ferrites, metallic iron, cobalt, alloys, and rare-earth hard magnets. Several examples of shapecontrolled synthesis of nanoparticles and shape-induced texture in selfassembled nanoparticle superlattices are also outlined. Potential applications, particularly in data storage, permanent magnet and biomedicine, of these nanoparticles and assemblies are discussed.

show abstract

High thermal stability of carbon-coated L10-FePt nanoparticles prepared by salt-matrix annealing

Cited by 40 publications

References 23 publications

Selective Production of 1,2‐Propylene Glycol from Jerusalem Artichoke Tuber using Ni–W₂C/AC Catalysts

Selective Production of 1,2‐Propylene Glycol from Jerusalem Artichoke Tuber using Ni–W₂C/AC Catalysts

Phase Transformation and Magnetic Hardening in Isolated FePt Nanoparticles

Chemical Synthesis, Self-Assembly and Applications of Magnetic Nanoparticles

Contact Info

Product

Resources

About

High thermal stability of carbon-coated L10-FePt nanoparticles prepared by salt-matrix annealing

Cited by 40 publications

References 23 publications

Selective Production of 1,2‐Propylene Glycol from Jerusalem Artichoke Tuber using Ni–W2C/AC Catalysts

Selective Production of 1,2‐Propylene Glycol from Jerusalem Artichoke Tuber using Ni–W2C/AC Catalysts

Phase Transformation and Magnetic Hardening in Isolated FePt Nanoparticles

Chemical Synthesis, Self-Assembly and Applications of Magnetic Nanoparticles

Contact Info

Product

Resources

About

Selective Production of 1,2‐Propylene Glycol from Jerusalem Artichoke Tuber using Ni–W₂C/AC Catalysts

Selective Production of 1,2‐Propylene Glycol from Jerusalem Artichoke Tuber using Ni–W₂C/AC Catalysts