Materials Literature
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The effect of crystalline imperfections (as for instance, grain size, inclusions and dislocations) on the coercivity of soft magnetic materials is additive. This only can be explained by an Energy Balance Model. By another hand, the angular dependence of the coercivity only can be explained with a Force Balance Model.…
Understanding strongly correlated rare-earth intermetallic compounds requires knowledge of the nature of the fermionic quasiparticles in states near the Fermi level ${E}_{\mathrm{F}}$. We report on a pump-probe experiment using femtosecond time- and angle-resolved photoemission spectroscopy to determine lifetimes of h…
Abstract The complete universe of possible polytypes of layered double hydroxides (LDH) is predicted on the basis of symmetry arguments. A single [MX 2 ] (X = OH) layer, also defined as a structural synthon, belongs to the layer group P $\bar{3}$ 2/ m 1. These layers can be stacked in such a way as to conserve the uni…
Abstract In this article, theoretical interpretation and prediction of the optical properties of nanodiamond (ND) particles', containing various luminescence centers, was made. Particularly, nitrogen, and chromium atoms embedded into the diamond crystal lattice were modeled. In the case of nitrogen centers containing…
We present a detailed picture to screen general ligands from simple chemicals for fabricating affinity surface to glycosidase enzymes. The surface was constructed by grafting poly(2-hydroxyethyl methacrylate) (PHEMA) brush on SPR gold chip via surface-initiated atom-transfer radical polymerization, after which poly(me…
The stationary Josephson effect in a system of ballistic graphene is studied in the framework of quasiclassical Green's function theory. Reflecting the ultimate two-dimensionality of graphene, a Josephson junction involving a graphene sheet embodies what we call a planar Josephson junction, in which superconducting el…
In the fabrication of nuclear reactor core parts, machining chips of Zircaloy are generated. These alloys are strategic for nuclear technology and cannot be discarded. In the present work are presented two methods for recycling of Zircaloy chips. One of the methods is by melting in VAR furnace and the other by powder…
The modulated magnetic ordering and the atomic position modulation are studied in the case of the multiferroic CaCu x Mn 7- x O 12 by neutron and SR powder diffraction methods. Below the magnetic transition temperature of T N2 =50 K both orderings are described by using the magnetic superspace group R31'(00γ)ts. For t…
Sintering and crystallization behaviors of a LZS glass-powder were investigated by means of thermal shrinkage, differential thermal analysis, X-ray diffraction as well as density and mechanical properties measurements. The melted glass, 9.56Li 2 O.22.36ZrO 2 .68.08SiO 2 (wt%) first was cast into water to provide a fri…
Low-molecular-weight poly(ethylene carbonate) diols of varying molecular weight were generated through catalyzed thermal degradation of high-molecular-weight poly(ethylene carbonate). These polymers were then end functionalized with acrylate groups. The resulting α,ω-diacrylates were effectively photo-cross-linked upo…
ABSTRACT Mineralogical transformations during firing of clays from the Laboyos Valley at the Upper Magdalena Basin(Colombia) were studied. Firing of clays was carried out in the temperature range 800–1200 °C under oxidizing conditions. The mineralogical transformations were investigated by X-ray diffraction (XRD) and…
Abstract A chiral polyfluorene–thiophene derivative incorporating two different chiral side chains was synthesized via the Suzuki coupling reaction. Upon photoexcitation, thin films of the polymer exhibited efficient circularly polarized luminescence in the visible range, even without thermal annealing. The dissymmetr…
Abstract In the nearly 45 years since Stan Ovshinsky's original publication [Phys. Rev. Lett. 21 , 1450 (1968)] announcing the discovery of electric‐field‐induced threshold switching in chalcogenide alloy semiconductor glass thin films, the field of amorphous semiconductor physics has developed remarkably. Many commer…
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A solid-state micro magnetic refrigerator (SSMMR) has some advantages to cool microdevices because of its high efficiency and simple structure. In this study, we demonstrated the actual cooling of a thermally-isolated microstructure, which is a main component of the SSMMR, by the magnetocaloric effect. The thermal iso…
The advantage of the incorporation of tire rubber powder and rice husk ash in the polymer compound is mainly due to the reduction of the products cost, as well as improving the essential properties for a great processing of the material, for example, its flow into a hole of a thin wall mold. The rice husk ash can repl…
Cerium oxide has a high potential to be apply in removing pollutants combustion powders, organic materials from waste water and in the technology of fuel cells. Nickel oxide is an attractive material due to its excellent chemical stability, and their optical, electrical and magnetic proprieties. In this work, CeO 2 -N…
In Nd 2 Fe 14 B sintered magnets there is increase of coercivity after Dy diffusion in the region near the surface of the grains. A kinetical model evaluating the Dy surface diffusion is presented. This model is based on a shell hypothesis: the most relevant place for the nucleation is a tiny shell near the grain boun…
Density functional calculations and ab initio molecular dynamics simulations are performed to investigate adsorption and dissociation of O 2 molecules on the DI (double icosahedron) Pd19 nanocluster. Exceptionally high activity is found for oxygen bond cleavage over its waist region, with an energy barrier of only 0.0…
The objectives of this paper are study effect of dispersion of hard alumina (Al 2 O 3 ) microparticles-filled polypropylene (PP) composites. Al 2 O 3 /PP composites containing 1.0 – 5.0 wt% of the Al 2 O 3 were prepared through melt blending and specimens were produced through injection moulding technique. This study…