Alloy, nanosized

Duxin N et al 1997 Nanosized Fe-Cu-B alloys and oomposites synthesized in diphasio systems J. Phys. Chem. B 101 8907... 

Figure 11.11 Linear cyclic voltammograms of carbon-supported nanosized Pt and Pt-Cr alloy catalysts with different atomic ratios (prepared using the carbonyl route [Yang et al., 2004]) recorded in 0.5 M HCIO4 saturated with pure oxygen at a scan rate of 5 mV s and a rotation speed of 2000 rev min Current densities are normalized to the geometric surface...

Yang H, Alonso-Vante N, Leger JM, Lamy C. 2004. Tailoring, structure, and activity of carbon-supported nanosized Pt-Cr alloy electrocatalysts for oxygen reduction in pure and methanol-containing electrolytes. J Phys Chem 108 1938-1947. 

Hydrogen absorption/desorption characteristics of magnesium-nickel alloy containing 23 atomic% Ni. (Reproduced with permission from Schwarz, R.B., Storage of hydrogen in powders with nanosized crystalline domains, Mater. Res. Bull., 24, 40, 1999, available at http //www.wtec.org/loyola/nano/US.Review/04 06.htm, May 2007.)... 

Equation 3.1 and Equation 3.2) (including the mean particle sizes obtained) (Adapted from Bonnemann, H. and Brijoux, W., in Surfactant-Stabilized Nanosized Colloidal Metals and Alloys as Catalyst Precursors/Advanced Catalysts and Nanostructured Materials, Moser, W., Ed., Academic Press, San Diego, 1996, pp. 165-196, Chap. 7. With permission from Elsevier Science.)... 

Two kinds of alloys resistant to hydrogen embrittlement can be used for hydrogen containers FeNiCr stainless steel and FeNiCr stainless steels strengthened with N. Mn and nanosize /-precipitates strengthened superallovs. 

K.-E. Aguey-Zinsou, T. Nicolaisen, J.R. Ares Fernandez, T. Klassen, R. Bormann, Effect of nanosized oxides on MgH (de)hydriding kinetics, J. Alloys Compd. 434 35 (2007) 738-742. 

Yin W, Zhang MS (2003) Characterization of nanosized Tb-MCM-41 synthesized by the sol-gel-assisted self-assembly method. J Alloys Compounds 360 231-235... 

For practical comparison we take an ample set of experimental data reported in Ref. 64 (and confirmed in Ref. 65) on linear and cubic susceptibilities of Cu-Co precipitating alloys. The given data cover the frequency domain 38-840 Hz and the temperature range 10-190 K. Synthesis of the samples as well as the method of magnetic measurement are described. However, apart from the observation that Cu-Co alloys precipitate, yielding a dispersion of cobalt nanosize particles in a copper matrix, no particular structural information on the system is given. 

Abstract. IR pyrolysis of PAN and PAN based composites yields ordered graphitelike structure as well as several carbon nanostructures. Metal-carbon nanocomposites, in which the nanosized metal particles were introduced into the structure of carbon matrix in the course of IR pyrolysis of composite-precursor on the basis of PAN and metal (Gd, Pt, Ru, Re) compounds were prepared. The carbon phase of metal-carbon nanocomposites was shown to include different types of nano structured carbon particles. Bamboo-like CNT were observed in the structure of pyrolized at 910 and 1000°C composite-precursor based on PAN and GdCl3. At T=1200°C the solid carbon spheres with diameter in the range of 50-360 nm and octahedral carbon particles with the size in the range of 300-350 nm were observed. These nanostructured particles consist of carbon only or they include Gd nanoparticles incapsulated in carbon shell. IR pyrolysis of composite-precursor based on PAN as well as H2PtCl6 and RuC13 or NH4Re04 (Pt Ru(Re)=10 l) allows the preparation of Pt-Ru and Pt-Re alloys nanoparticles with 2[Pg.577]

X-ray diffractogram patem in the range 0=5-40° shows the presence of wide peak of amorphous carbon phase and three narrow peaks of Pt. According to X-ray diffraction data, bimetallic nanosized particles are alloys with simple cubic lattice (parameter a=3.888 A for Pt-Ru and a=3.899 A for Pt-Re). 

Other top-down methods are used for the production of ultrafine-grained (UFG) metals and alloys. These include the devitrification of metallic glass and severe plastic deformation, in which a coarse-grained poly crystalline metal or alloy is subjected to large shear strains under pressure, forcing the grains to subdivide into nanosized... 

In recent years, we have seen an explosive interest in nanomaterials, in particular in nanofibers, nanofilaments, and nanotubes of the very different chemical composition. The interest arises from the specific mechanical and physicochemical properties of these nano objects, which allow them to be used, for example, as specific adsorbents, catalyst supports, reinforcing components of composite materials, and so on. The most cited generic types of nanomaterials are carbon nanofilaments and nanotubes. Numerous methods for preparing these carbon materials are known. However, the simplest method seems to be thermal pyrolysis of various carbon contain ing precursors (e.g., carbon monoxide, saturated and unsaturated hydro carbons, etc.) in the presence of special catalysts that are typically nanosized particles of nickel, cobalt, iron metals, or their alloys with different metals. 

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