Sonochemical synthesis and characterization of nanostructured iron and its alloys

Gonsalves, Kenneth E.; Rangarajan, Sri Prakash; Garcı́a-Ruiz, A.; Law, C. C.

doi:10.1007/bf00274395

Cited by 13 publications

(14 citation statements)

References 18 publications

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“…9 Briefly, a 1 M solution of Fe(CO) 5 in Decalin was sonochemically irradiated under ambient atmosphere for 3 h. Similarly, the sonochemical irradiation of 1 M solution of Fe(CO) 5 in Decalin was performed in the presence of the applied external homogeneous magnetic field of 7 kG. In the both cases, the powder obtained was centrifuged, washed repeatedly with dry pentane (6-7 times, 8500 rpm), dried in a vacuum at room temperature for 3 h, and annealed in a vacuum at 140°C for 3 h in order to remove organic residua.…”

Section: Methodsmentioning

confidence: 99%

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Sonochemistry under an Applied Magnetic Field: Determining the Shape of a Magnetic Particle

Prozorov

Koltypin

et al. 1998

J. Phys. Chem. B

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The sonochemical irradiation of Fe(CO) 5 solution in Decalin has been carried out with and without an external magnetic field. Direct TEM measurements reveal that the sample obtained without a magnetic field consists of spongelike particles with a mean size of about 25 nm, whereas the sample synthesized in a 7 kG magnetic field consists of highly acicular particles of 50 nm in length and 5 nm in width. Our finding sheds light on the process of particle nucleation during sonication, which cannot be a diffusion-assisted growth because of the very small time scale. We conclude, therefore, that particles are forced to form an acicular entity by direct magnetic interactions. The amorphous nature of the as-prepared substance was verified by X-ray diffraction, selected area electron diffraction, and differential scanning calorimetry. The magnetic moment vs temperature measurements and Mössbauer spectroscopy reveal a large shift of the blocking temperature of about 70 K toward higher temperatures for the sample obtained in magnetic field. We attribute the observed shift to the significant enhancement of the particle shape magnetic anisotropy.

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Section: Methodsmentioning

confidence: 99%

“…The pioneering work of Suslick and co-workers has demonstrated the possibility of synthesizing nanophased amorphous iron by passing ultrasound radiation through Fe(CO) 5 . 1,2 This work has led to an extensive investigation of the decarbonylation reaction.…”

Section: Introductionmentioning

confidence: 99%

Sonochemistry under an Applied Magnetic Field: Determining the Shape of a Magnetic Particle

Prozorov

Koltypin

et al. 1998

J. Phys. Chem. B

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“…Solution-based processing routes used for the synthesis of nanoparticles include precipitation of solids from a supersaturated solution [188,189], homogeneous liquid phase chemical reduction [190][191][192] and ultrasonic decomposition of chemical precursors [193][194][195]. These processes are attractive due to their simplicity, versatility and availability of low cost precursors.…”

Section: Wet Chemical Synthesismentioning

confidence: 99%

“…The cooling achieved during the cavitation collapse is estimated to be greater than 2 Â 10 9 K. This process is commonly referred to as sonochemical method. Transition metal nanoparticles can be produced via sonication of their respective chemical precursors [194][195][196][197]. For example, Suslick et al sonicated Ni(CO) 4 under argon atmosphere to obtain amorphous nickel [194].…”

Section: Wet Chemical Synthesismentioning

confidence: 99%

“…Gonsalves et al prepared nanostructured a-Fe either either via sonication or thermal decomposition of Fe(CO) 5 solution [195]. One disadvantage of the sonication process is the difficulty in controlling the resulting particle size and distribution due to the agglomeration of particles into a porous coral-like microstructure [195].…”

Section: Wet Chemical Synthesismentioning

confidence: 99%

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Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

837

345

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In recent years, near-nano (submicron) and nanostructured materials have attracted increasingly more attention from the materials community. Nanocrystalline materials are characterized by a microstructural length or grain size of up to about 100 nm. Materials having grain size of $0.1 to 0.3 mm are classified as submicron materials. Nanocrystalline materials exhibit various shapes or forms, and possess unique chemical, physical or mechanical properties. When the grain size is below a critical value ($10-20 nm), more than 50 vol.% of atoms is associated with grain boundaries or interfacial boundaries. In this respect, dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid. Therefore, grain boundaries play a major role in the deformation of nanocrystalline materials. Nanocrystalline materials exhibit creep and super plasticity at lower temperatures than conventional micro-grained counterparts. Similarly, plastic deformation of nanocrystalline coatings is considered to be associated with grain boundary sliding assisted by grain boundary diffusion or rotation. In this review paper, current developments in fabrication, microstructure, physical and mechanical properties of nanocrystalline materials and coatings will be addressed. Particular attention is paid to the properties of transition metal nitride nanocrystalline films formed by ion beam assisted deposition process. #

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Sonochemistry and Other Novel Methods Developed for the Synthesis of Nanoparticles

Gedanken

Mastai

2004

The Chemistry of Nanomaterials

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Sonochemical synthesis and characterization of nanostructured iron and its alloys

Cited by 13 publications

References 18 publications

Sonochemistry under an Applied Magnetic Field: Determining the Shape of a Magnetic Particle

Sonochemistry under an Applied Magnetic Field: Determining the Shape of a Magnetic Particle

Nanocrystalline materials and coatings

Sonochemistry and Other Novel Methods Developed for the Synthesis of Nanoparticles

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