Materials Literature
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Large high-quality single crystals of Bi2Sr2Can-1CunO2n+4+d (n = 2, 3) were successfully grown using an improved traveling solvent floating zone (TSFZ) method, which features a slow growth rate and steep temperature gradient along the melting zone. By measuring anisotropic resistivities and susceptibilities of Bi2Sr2C…
We study both linear and nonlinear surface waves localized at the interface separating a left-handed (LH) medium (i.e., a medium with both negative dielectric permittivity and negative magnetic permeability) and a conventional [or right-handed (RH)] dielectric medium. We demonstrate that the interface can support both…
We recently demonstrated that the diphenylalanine recognition motif of the Alzheimer's β-amyloid polypeptide self-assembles into ordered and discrete nanotubes. Here, we reveal that diphenylglycine, a highly similar analogue and the simplest aromatic peptide, forms spherical nanometric assemblies. As the nanotubes, th…
Single-walled carbon nanotube (SWNT) reinforced polymer composite membranes have been fabricated using the electrospinning technique. Nanofibers with a diameter in the range 50−100 nm were obtained by electrospinning SWNT-filled polystyrene composites. TEM observations revealed incorporation of small SWNT bundles orie…
Abstract Creep motion of ferroelectric domain walls in epitaxial Pb(Zr 0.2 Ti 0.8 )O 3 thin films was studied by atomic force microscopy. The dynamical exponent μ was found to be smaller than in previous reports, with values significantly lower than 1 observed in samples with a‐axis inclusions.
An antimony-doped germanium single crystal was grown by the axial heat processing (AHP) method from the melt to study the influence of facets on the morphological stability of a solid/liquid interface. A mathematical model together with experimental data was utilized to predict the solute concentration and stability i…
We investigate the time evolution of the density of interfaces in a two-phase mixture, with particular emphasis on the role of compressibility, dilatability and phase transitions. Two different and complementary routes are considered: a rather intuitive one based on exact results for dilute mixtures which are then int…
Abstract Pulse field gradient (PFG) NMR measurements have been made to study the diffusion of diethyl ether in blends of poly(ethylene oxide) (PEO) and poly(methyl methacrylate) (PMMA). The blends have 10–30 wt % PEO, a composition range within which these materials are amorphous glasses. The diffusion of diethyl ethe…
Resonant enhancement enables the discovery and delineation of spin-flip Raman scattering (SFRS) from free or donor-bound electrons in diluted magnetic semiconductors containing $3d$ transition-metal ions at doping concentrations. In such studies, the intrinsic g factor of the host, CdTe in the present case, has to be…
Although individual structures of cAMP-dependent protein kinase (PKA) catalytic (C) and regulatory (R) subunits have been determined at the atomic level, our understanding of the effects of cAMP activation on protein dynamics and intersubunit communication of PKA holoenzymes is very limited. To delineate the mechanism…
Abstract Binary CNBR/PP‐g‐GMA and ternary CNBR/PP/PP‐g‐GMA thermoplastic elastomers were prepared by reactive blending carboxy nitrile rubber (CNBR) powder with nanometer dimension and polypropylene functionalized with glycidyl methacrylate (PP‐g‐GMA). Morphology observation by using an atomic force microscope (AFM) a…
Two-dimensional patterned and controlled polyelectrolyte aggregations (e.g., tree-like ramified structures) created by microcontact printing have been demonstrated and discussed. Polyelectrolyte-micropatterned aggregations on surfaces were controlled by the micropattern size and shape of PDMS stamps. The formation of…
Using the first-principles layer-multiple-scattering method we developed in previous work, we analyze recent experimental data on the extinction of light by rectangular two-dimensional arrays of gold nanoparticles on a dielectric waveguide. The theoretical results reproduce accurately the measured spectra and provide…
Different stacking arrangements of ${\mathrm{BC}}_{3}$ layered crystals are studied with the use of the ab initio pseudopotential density-functional method. The total energies, lattice constants, electron energy band structures and density of states, as well as phonon frequencies are calculated for the possible bulk $…
Magnetic MnZn-ferrite nanoparticles with a narrow size distribution were prepared in water–CTAB–hexanol microemulsions. The region of microemulsion stability in the system was determined, using the titration method, as a function of the temperature and of the type and concentration of solutes in the aqueous phase. The…
We present an overview of currently available EUV multilayer coatings that can be used for the construction of solar physics instrumentation utilizing normal-incidence optics. We describe the performance of a variety of Si-based multilayers, including Si/B<sub>4</sub>C and new Si/SiC films that provide improved perfor…
The metal-insulator transition and magnetic collapse of NiO under high pressures have been studied with the hybrid density functional (HDF) and the general-gradient approximation (GGA). Our results show that even in the intermediate coupling regime GGA does not take the correlation effects into account appropriately.…
Hydrogen-related degradation of the mechanical properties of a Ni-Ti superelastic alloy has been examined by means of delayed fracture tests in acidic and neutral fluoride solutions and hydrogen thermal desorption analysis. Delayed fracture took place in both solutions; the time to fracture was shorter in the acidic s…
In their Report “Micellar nanocontainers distribute to defined cytoplasmic organelles” (25 April, p. [615][1]), R. Savic et al. studied the intracellular distribution of endocytosed poly(caprolactone)23-poly(ethylene oxide)45 (PCL-PEO) micelles in PC12 cells where tetramethylrhodamine-5-
We have performed pseudopotential calculations and x-ray-diffraction and x-ray-absorption measurements on the ${\mathrm{CuGaO}}_{2}$ delafossite under high pressure. We have completely characterized the structural behavior of the low pressure phase. We have found out that the a axis is more compressible than the c axi…