Materials Literature
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It is found that there exists a category of material interfaces, readily available, that not only can provide total refraction (i.e., zero reflection) but can also give rise to amphoteric refraction (i.e., both positive and negative refraction) for electromagnetic waves in any frequency domain as well as for ballistic…
We study theoretically the viscoelastic properties of sheared binary fluids that have strong dynamical asymmetry between the two components. The dynamical asymmetry arises due to asymmetry between the viscoelastic stresses, particularly the bulk stress. Our calculations are based on the two-fluid model that incorporat…
Substitutions at the Mn-site of the charge-ordered Pr0.5Ca0.5MnO3 manganite is an effective way to induce abrupt jumps on the magnetic field driven magnetization curve. In order to get new insights into the origin of this remarkable feature, the Pr0.5Ca0.5Mn0.97Ga0.03O3 perovskite manganite has been studied by neutron…
We present {\em direct} and {\em linear} measurements of the normal stiffness and damping of a confined, few molecule thick water layer. The measurements were obtained by use of a small amplitude (0.36 $\textrmÅ$), off-resonance Atomic Force Microscopy (AFM) technique. We measured stiffness and damping oscillations re…
Molecular dynamics simulations have been used to obtain the three-dimensional distribution of interfacial mixing and cascade defects in Ti/Pt multilayer system due to single 1 keV $Ar^+$ impacts at grazing angle of incidence. The Ti/Pt system was chosen because of its relatively high heat of mixing in the binary alloy…
Using full-potential, density-functional-based methods we have studied electron-phonon interaction in ZrB2 and TaB2 in P6/mmm crystal structure. Our results for phonon density of states and Eliashberg function show that the electron-phonon coupling in ZrB2 is much weaker than in TaB2. In particular, we find that the a…
We present a first-principles density-functional calculation for the Raman spectra of a neutral BEDT-TTF molecule. Our results are in excellent agreement with experimental results. We show that a planar structure is not a stable state of a neutral BEDT-TTF molecule. We consider three possible conformations and discuss…
One of the remarkable properties of the II-VI diluted magnetic semiconductor (ZnMn)Se is the giant spin splitting of the valence band states under application of the magnetic field (giant Zeeman splitting). This splitting reveals strong exchange interaction between Mn moments and semiconductor states. On the other han…
We report unambiguous experimental evidence of broken time reversal symmetry for the interaction of light with an artificial non-magnetic material. Polarized colour images of planar chiral gold-on-silicon nanostructures consisting of arrays of gammadions show intriguing and unusual symmetry: structures, which are geom…
Hollow nanostructures of platinum have been synthesized by reducing PtCl2 with alcohol in the presence of selenium nanowires or colloids. The Se template could be removed by soaking the resultant Se@Pt nanostructures in hydrazine or by heating them to 200-250 degrees C. The size and wall thickness of the polycrystalli…
The possibility of making rigid polymer layered nanocomposites from biocompatible/biodegradable matrixes was explored. Three types of commercially available organophilic clay were employed to concurrently study the effects of organic modifier miscibility with the matrix and of the extent of clay modification on overal…
Ferromagnetism with ${T}_{c}>350\text{ }\mathrm{K}$ is observed in the diluted magnetic semiconductor ${\mathrm{N}\mathrm{i}}^{2+}\ensuremath{\mathbin:}\mathrm{Z}\mathrm{n}\mathrm{O}$ synthesized from solution. Whereas colloidal ${\mathrm{N}\mathrm{i}}^{2+}\ensuremath{\mathbin:}\mathrm{Z}\mathrm{n}\mathrm{O}$ nanoc…
Efficient lanthanide (Ln) luminescent probes require good ligand-to-metal energy transfer and high aqueous stability. A family of ligands based on 2-hydroxyisophthalamide chelating units is reported. These form highly stable, eight-coordinate Ln complexes. Several of these (Ln = Sm, Eu, Tb, Dy) emit in the visible reg…
High-quality alloyed Zn(x)Cd(1-x)S nanocrystals have been synthesized at high temperature by the reaction of a mixture of CdO- and ZnO-oleic acid complexes with sulfur in the noncoordinating solvent octadecene system. A series of monodisperse wurtzite Zn(x)Cd(1-x)S (x = 0.10, 0.25, 0.36, 0.53) nanocrystals were obtain…
Abstract Liquid crystals are fluids with a directionality defined. Polymers are long molecules with a shape that can be changed. As a network, polymers form rubber - a soft solid that is locally liquid-like and capable of huge extension. Liquid crystal elastomers are a combination of all these curious aspects, but wit…
The electronic subband structure of carriers in bismuth-like cylindrical nanowires is investigated analytically, using an anisotropic effective mass model. Quantum confinement effects are found to be significantly enhanced over the results of a quasi-isotropic approach, due to the correct consideration of both the mas…
Das Schwefel-Stickstoff-Radikal p-O2NC6F4CNSSN. (siehe Kristallstrukturbild) ist eines von wenigen organischen Radikalen, die oberhalb von 1 K Ferromagnetismus zeigen. Die annähernd orthogonale Anordnung der einfach besetzten Orbitale benachbarter Moleküle scheint für dieses Verhalten wichtig zu sein.
Abstract The crystallization and melting behavior of poly(ether ether ketone) (PEEK) in blends with poly(aryl ether sulfone) (PES) prepared by melt mixing are investigated by differential scanning calorimetry (DSC) and wide‐angle X‐ray scattering (WAXS). The presence of PES is found to have a notable influence on the…
The quaternary K(x)Sn(6-2x)Bi(2+x)Se(9) and KSn(5)Bi(5)Se(13) were discovered from reactions involving K(2)Se, Bi(2)Se(3), Sn, and Se. The single crystal structures reveal that K(x)Sn(6-2x)Bi(2+x)Se(9) is isostructural to the mineral heyrovskyite, Pb(6)Bi(2)S(9), crystallizing in the space group Cmcm with a = 4.2096(4…
Abstract Nanocomposites formed from organically modified montmorillonite and poly(ethylene‐ co ‐vinyl acetate) were studied by X‐ray diffraction techniques. Wide‐ and small‐angle X‐ray scattering intensities (SAXS and WAXS) were recorded by transmission mode on test bars cut from compression‐molded plaques tilted by d…