Materials Literature
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Copper nanocrystals are obtained by chemical reduction of copper ions in mixed reverse micelles. A large excess of reducing agent favors producing a new generation of shaped copper nanocrystals as nanodisks, elongated nanocrystals, and cubes. By using UV-Visible spectroscopy and numerical optical simulations we demons…
We have synthesized the solid solution ${\mathrm{Sr}}_{2}{\mathrm{Fe}}_{1+x}{\mathrm{Mo}}_{1\ensuremath{-}x}{\mathrm{O}}_{6}$ with $\ensuremath{-}1\ensuremath{\leqslant}x\ensuremath{\leqslant}0.25$, the composition $x=0$ corresponding to the well-known double-perovskite system ${\mathrm{Sr}}_{2}\mathrm{Fe}\mathrm{Mo}{…
This paper examines the mechanism of pore formation in anodic films on aluminium. For this purpose, the dimensional changes of specimens during growth of porous films on aluminium in phosphoric and sulphuric acid electrolytes are examined using transmission and scanning electron microscopies. Further, the compositions…
Abstract A biodegradable aliphatic thermoplastic polyurethane based on L ‐lysine diisocyanate and 1,4‐butanediol hard block segments, and 2000 g/mol poly(ε‐caprolactone) diol soft block segments was synthesized. The resulting polymer was a tough thermoplastic with ultimate tensile strength of 33 MPa and elongation of…
The photoluminescence of Ce 3+ and Tb 3+ ions in zinc metaphosphate glasses is investigated. The blue and green emissions of Tb 3+ ions are enhanced upon UV excitation through energy transfer from Ce 3+ to Tb 3+ ions. The efficiency of such an energy transfer was estimated based on spectroscopic data and resulted in b…
A 2-mm-diameter glass sphere of ferroelectric BaTi 2 O 5 was fabricated from melt using containerless processing. The glass structure was analyzed by high-energy X-ray diffraction using an incident photon energy of 113.5 keV, indicating that distorted Ti−O polyhedra, with average coordination number ( N Ti - O ) of ap…
Biodegradable fibers of poly[( R )-3-hydroxybutyrate- co -8%-( R )-3-hydroxyvalerate] (P(3HB- co -8%-3HV)) produced from wild-type bacteria were prepared by melt-spinning, followed in an amorphous state by quenching near the glass transition temperature ( T g ). High tensile strength fibers of over 1 GPa were prepared…
We review the phenomenon of ferromagnetic resonance (FMR) in ferromagnetic (FM) Ga 1− x Mn x As semiconductor alloys and their heterostructures in thin film form. We will show that the analysis of FMR in Ga 1− x Mn x As films can directly provide values of cubic and uniaxial magnetic anisotropy fields in these materia…
Abstract Polymer‐layered silicate nanocomposites (PLSNs) have been shown to have significantly reduced flammability. Based upon numerous studies to date, the proposed mechanism by which flammability reduction occurs is through formation of a silicate‐reinforced char layer that protects the underlying polymer. To furth…
We report on the anomalous Hall coefficient and longitudinal resistivity scaling relationships on a series of annealed Ga1-xMnxAs epilayers (x~0.055). As-grown samples exhibit scaling parameter n of ~ 1. Near the optimal annealing temperature, we find n ~ 2 to be consistent with recent theories on the intrinsic origin…
The stable tubelike Au(N) (N=26-28) has been found using the scalar relativistic all-electron density functional theory calculations, which becomes another powerful candidate for the lowest-energy Au(N), competing in energy with those space-filled structures suggested previously. Unlike the icosahedral "golden" fuller…
We have incorporated fluorescent quantum dots (QDs) into polystyrene microspheres using functionalized oligomeric phosphine (OP) ligands. We find that a uniform distribution of quantum dots is loaded inside each polymer bead. Some local close-packing of quantum dots in the beads is attributed to the self-polymerizatio…
Au(III)-Schiff base complexes are active hydrogenation catalysts, giving turnover frequencies similar to those of the corresponding complexes of Pd(II), which has the same d8 electronic structure as Au(III). The mechanism of the reaction has been studied in detail by a combination of kinetic experiments and theoretica…
Supramolecular gels and liquid-crystalline materials containing borondipyrromethene (F-Bodipy) are a new class of highly luminescent materials built by attachment of long-chain alkoxydiacylamido scaffoldings to boradiazaindacene templates. Robust gels were formed in nonane, and luminescence spectroscopy was used to pr…
A numerical model for describing bipolar charge transport and storage in polyethylene has been developed recently. The present paper proposes a comparison of the model outputs with experimental data in three different direct current (DC) voltage application protocols (step field increase and polarization/depolarizatio…
Magnetic multiwalled carbon nanotubes (MWNTs) were facilely prepared by the electrostatic self-assembly approach. Poly(2-diethylaminoethyl methacrylate) (PDEAEMA) was covalently grafted onto the surfaces of MWNTs by MWNT-initiated in situ atom transfer radical polymerization (ATRP) of 2-diethylaminoethyl methacrylate…
Surface wave propagation at the interface between different types of gyrotropic materials and an isotropic negatively refracting medium, in which the relative permittivity and relative permeability are, simultaneously, negative is investigated. A general approach is taken that embraces both gyroelectric and gyromagnet…
We study numerically the existence and character of bound states for positive and negative point charges shielded by the response of a two-dimensional homogeneous electron gas. The problem is related to many physical situations and has recently arisen in experiments for impurities on metal surfaces with Schockley surf…
The effect of microscopic Mn cluster distribution on the Curie temperature (TC) of (Ga,Mn)N is studied using density-functional calculations together with the mean field approximation. We find that the calculated TC depends crucially on the microscopic cluster distribution, which can explain the abnormally large varia…
Making films: Removal of most of the toluene from a two-phase toluene/water mixture causes nanoparticles present at the liquid–liquid interface to pack closely together in an ordered monolayer film (MLF). This MLF can be removed from the interface for further study.