Materials Literature
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Second-order spin-wave expansions are used to compute the ground-state energy and sublattice magnetizations of the quantum one-dimensional Heisenberg ferrimagnet with nearest-neighbor antiferromagnetic interactions and two types of alternating sublattice spins ${S}_{1}>{S}_{2}.$ It is found that in the extreme quan…
A soluble poly(amic acid) precursor solution of fully rod-like poly(p-phenylene pyromellitimide) (PMDA-PDA) was spin cast on silicon substrates, followed by soft bake at 80–185°C and subsequent thermal imidization at various conditions over 185–400°C in nitrogen atmosphere to be converted to the polyimide in films. Re…
Single crystals of bis(thiourea)zinc chloride, Zn[CS(NH2)2]2Cl2 (BTZC), were grown by slow evaporation of an aqueous solution at room temperature. The crystal has been studied at room temperature by Raman spectroscopy between 20 and 1700 cm—1 and 3000 and 3500 cm—1 and by infrared transmittance in the 400 to 4000 cm—1…
The first steps of the accommodation of extrinsic dislocations in Σ = 3 grain boundaries have been observed in nickel bicrystals. Two types of reaction have been investigated in detail using the weak-beam technique in addition to conventional transmission electron microscopy analyses and the image-matching technique.…
Ion-transport processes in silicate glasses containing alkali and alkaline-earth ions are studied using dynamic mechanical thermal analysis. The mechanical loss spectra are analyzed with respect to the frequency response, the height, and the activation energy of the loss peaks. It is found that the frequency response…
The maximum energy products, (BH)max, of isotropic Nd-Fe-B-based nanocomposite magnets were calculated by a three dimensional model (10×10×10) that incorporated non-uniform magnetization reversals by subdivisions of the grains. Based on the results of our simulation, the largest obtainable (BH)max for a sample with 60…
A newly developed Sm(Co,Fe,Cu,Zr)z magnet, with z≈7, has a lower temperature coefficient of coercivity β, as compared with other commercial magnets with z≈7.7. It was found that the initial magnetization curve for the newly developed magnet is typical of pure uniform domain wall pinning, while for the commercial magne…
Magnetostrictive multilayer films which combine exchange coupled giant magnetostrictive materials (amorphous Tb0.4Fe0.6) and soft magnetic materials with large polarizations and considerable magnetostriction (crystalline Fe0.5Co0.5) were prepared by magnetron sputtering. The microstructure and the magnetic properties…
The inclusion-dissociation behavior in the complex formation between molecular nanotubes and linear polymer chains in solutions is theoretically investigated by using the Flory-Huggins lattice model. While, in a good solvent, the polymer chains are gradually dissociated from or included into the tubes with varying tem…
Abstract This paper deals with the influence that the processing variables and the nature of the low‐molecular‐weight emulsifier used exert on the evolution of the droplet size distributions and linear viscoelasticity functions of concentrated oil‐in‐water emulsions during the emulsification process, and the way these…
The matrix isolation technique has been employed to isolate several intermediates, in sequence, in the oxidation of CH 3 OH by CrCl 2 O 2 . Consistent with previous theoretical calculations, a hydrogen-bonded complex formed initially after twin jet deposition and was enhanced by matrix annealing to 33 K. This complex…
Macromolecular complexes of Gd(III) chelates are widely investigated as MRI contrast agents. In addition to the potential increase in relaxivity, they have a further advantage over the Gd(III) chelates of an extended lifetime in the blood pool, which is necessary for magnetic resonance angiography applications. When d…
The heterogeneous reactions of HOBr with solid crystalline NaCl [HOBr(g) + NaCl(s) → BrCl(g) + NaOH(s)] and KBr [HOBr(g) + KBr(s) → Br 2 (g) + KOH(s)] substrates at ambient temperature have been investigated using a Teflon coated Knudsen cell reactor. Powder, grain, and spray-deposited salt substrates were used for th…
In this article, we report the investigation of sputtered magnesium as a suitable photoelectron emitter in a rf injector. The measurements were conducted on a 20 μm thick Mg layer, ion sputtered on a copper substrate. UV laser induced damage threshold measurements on this sample indicate that laser energy densities of…
The present work is the first report of the use of surface-enhanced Raman scattering (SERS) for two-dimensionally spatially resolved, chemically selective monitoring of the course of a surface-catalyzed photoreaction. We have recently developed the surface-enhanced Raman imaging (SERI) technique, which is chemically s…
Abstract Photoswitching of the enzymatic activity of ribonuclease S′ was successfully carried out by site specific incorporation of phenylazophenylalanine into S-peptide skeleton by semisynthesis.
The optical properties of GeTe and Ge 2 Sb 2 Te 5 have been studied by means of the density functional theory (DFT) in the local density approximation (LDA). The electronic band structures were obtained by two methods, the plane wave (PW) and spherical wave (SW) expansions of the wave functions. GeTe was calculated to…
The title compound consists of two-dimensional layers of [Au(CN) 2 ] - complexes alternating with layers of Eu 3+ ions. Due to this structure type, the lowest electronic transitions of the dicyanoaurates(I) exhibit an extreme red shift of Δν̄ max /Δ p = −130 ± 10 cm - 1 /kbar under high-pressure application at least u…
We report on the synthesis of Ti-containing diamondlike hydrocarbon (Ti-DLC) coatings by plasma-assisted physical vapor deposition and the characterization of coating microstructure and mechanical properties. We find that Ti-DLC coatings with Ti compositions higher than 5.5 at. % are composites consisting of nanocryst…
The theory of dislocation-induced X-ray or neutron diffraction line broadening developed by Krivoglaz et al. and Wilkens has been adapted for Rietveld refinement of the powder diffraction profile by fitting a Voigt function to each peak. Information on both the type of slip system and the density of dislocations in th…