Journal ArticleDOI
Formation of ultra-fine amorphous alloy particles by reduction in aqueous solution
TLDR
In this article, the preparation of small alloy particles by reduction of metal ions by KBH4 in aqueous solutions is described, which may have applications in ferrofluids, magnetic memory systems and catalysis.Abstract:
Amorphous alloys are normally prepared as thin ribbons or films by the liquid quench technique or by vapour deposition. Recently we have shown1 that ultra-fine amorphous Fe–C alloy particles can be prepared by thermal decomposition of Fe(CO)5 in an organic liquid; that is, by a chemical reaction. Here we report the preparation of small alloy particles by reduction of metal ions by KBH4 in aqueous solutions. Mossbauer and X-ray diffraction studies show that the particles are amorphous. The amorphous phase is formed because the chemical reaction takes place below the glass transition temperature and because boron atoms are present in the particles. The method may be used for the large-scale production of ultra-fine amorphous alloy particles, which may have applications in ferrofluids, magnetic memory systems and catalysis.read more
Citations
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Recent advances in the liquid-phase syntheses of inorganic nanoparticles.
TL;DR: The development of novel materials is a fundamental focal point of chemical research; and this interest is mandated by advancements in all areas of industry and technology.
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Magnetic Properties of Nanostructured Materials
TL;DR: In this paper, a classification of nanostructure morphology according to the mechanism responsible for the magnetic properties is presented, followed by a brief discussion of some promising experimental techniques in synthesis and measurements.
Journal ArticleDOI
Remediation of Cr(VI) and Pb(II) aqueous solutions using supported, nanoscale zero-valent iron
TL;DR: In this article, Borohydride reduction of an aqueous iron salt in the presence of a support material gives supported zero-valent iron nanoparticles that are 10−30 nm in diameter.
Journal ArticleDOI
Nanoscaled metal borides and phosphides: recent developments and perspectives
TL;DR: Chimie de la Matier̀e Condenseé de Paris, UPMC Univ Paris 06, UMR 7574, Colleǵe de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05; Laboratory Heteroelements and Coordination, Chemistry Department, Ecole Polytechnique, CNRS-UMR 7653, Palaiseau, France
Journal ArticleDOI
Nanoscopic Metal Particles − Synthetic Methods and Potential Applications
TL;DR: In this article, the authors present a synopsis of the wet chemical syntheses of colloidal particles and survey potential applications in catalysis and materials science, but their methods for the characterization of these particles and their surfaces are not reviewed.
References
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Book
X-ray diffraction procedures for polycrystalline and amorphous materials
Harold P. Klug,Leroy Alexander +1 more
Journal ArticleDOI
Sodium Borohydride, Its Hydrolysis and its Use as a Reducing Agent and in the Generation of Hydrogen1
Hermann I Schlesinger,Herbert C. Brown,A. E. Finholt,James R. Gilbreath,Henry R. Hoekstra,Earl K. Hyde +5 more
Journal ArticleDOI
The Mössbauer Effect in Iron Alloys
TL;DR: In this paper, a more quantitative relationship with the individual magnetic moments of the iron and solute atoms cannot be derived at present, due to the lack of information concerning the relation between the spin density at the nucleus and the spin densities in the environment.
Journal ArticleDOI
Formation of a metallic glass by thermal decomposition of Fe(CO)5.
TL;DR: In this article, the mechanism of glass formation is discussed, which results in crystallization of the particles into a mixture of α-Fe and δ-C. The authors show that the particles of a metallic glass are formed at 523 K.
Journal ArticleDOI
Magnetic Properties of Single-Domain Iron and Iron-Cobalt Particles Prepared by Borohydride Reduction
TL;DR: In this article, single-domain Fe and Fe-Co particles prepared by the reaction of the metal salts with aqueous borohydride have higher coercivities and axial ratios if prepared in a magnetic field.