Materials Literature
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A network structure of a ferromagnetic metallic (FMM)∕charge-ordered insulator (COI) mixed phase manganite has been obtained by annealing a 150Å Pr0.65(Ca0.75Sr0.25)0.35MnO3 film under tensile strain on a SrTiO3 substrate. Under the same deposition and annealing conditions, a film deposited on a LaAlO3 substrate, whic…
The ferroelectric phase transition in the Aurivillius phase ${\mathrm{Bi}}_{3}{\mathrm{Ti}}_{1.5}{\mathrm{W}}_{0.5}{\mathrm{O}}_{9}$ was studied by high-resolution neutron powder diffraction. Below the ferroelectric Curie temperature ${T}_{c}=735\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$…
Abstract Measurements of the thicknesses of SiO 2 on Si in the range 1.5–8 nm can be made by XPS with precisions as high as 0.025 nm at one standard deviation, but in the past this has been overshadowed by systematic uncertainties of the order of 20% of the thickness arising from the uncertainty in the relevant electr…
Spin excitation spectrum is studied in the double-exchange model in the presence of disorder. Spin wave approximation is applied in the lowest order of $1∕S$ expansion. The disorder causes anomalies in the spin excitation spectrum such as broadening, branching, anticrossing with gap opening. The origin of the anomalie…
Ab initio absorption spectra and optical gaps for hydrogen-passivated Ge nanocrystals are calculated using time-dependent density functional theory within the adiabatic local density approximation. The results are compared to previous effective mass, tight-binding, empirical pseudopotential, and ``$\ensuremath{\Delta}…
Silver and silver iodide nanocrystals have been synthesized in the water-in-CO(2) reverse microemulsions formed by the commonly used surfactant, sodium bis(2-ethylhexyl)sulfosuccinate (AOT), in the presence of 2,2,3,3,4,4,5,5-octafluoro-1-pentanol as cosurfactant. The nanometer-sized aqueous domains in the microemulsi…
The energy dependence of the mean free path $\ensuremath{\lambda}(E)$ in graphite at low kinetic energies (below $\ensuremath{\sim}50\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$) is studied using the synchrotron radiation excited Si $2p$ core level photoemission signal from a SiC substrate attenuated by an epitaxial graphi…
Abstract Delftia acidovorans P4a (DSMZ 10474) was grown in mineral medium on acetic acid at pH 8.0 without an additional supply of nutrients like yeast extract or polypeptone. Using acetic acid and γ‐butyrolactone (GBL), copolymers with a 4HB content from 2–90 mol % were detected in batch experiments, depending on the…
Detailed magnetization measurements $M(T,H,\ensuremath{\theta})$, were performed on single crystals of TbPtIn and TmAgGe (both members of the hexagonal ${\mathrm{Fe}}_{2}\mathrm{P}∕\mathrm{Zr}\mathrm{Ni}\mathrm{Al}$ structure type) for the magnetic field $H$ applied perpendicular to the crystallographic $c$ axis. Thes…
We present results on the in situ, two-dimensional growth (as opposed to the more commonly encountered island-coalescence mechanism) of continuous epitaxial Cu2O films on MgO(011) using dc facing-magnetron sputtering from metallic Cu targets in an oxygen/argon atmosphere. Film growth was studied as a function of depos…
Abstract The NCO‐terminated prepolymers, prepared by reacting a mixture of poly(tetramethylene glycol) and fumed nanosilica with 4,4′‐diphenylmethane diisocyanate, were chain‐extended with 1,4‐ butanediol to yield polyurethane‐silica nanocomposites. The nanosilica particles were well dispersed in the polyurethane matr…
Abstract The purpose of this project was to obtain new composites using filler and resin obtained from renewable resources, combining low cost and good mechanical properties. The matrix consisted of a polyester resin synthesized from linseed oil and further crosslinked with styrene in a peroxide‐initiated reaction. Co…
Abstract The choice of plasma gas can determine the interaction between material and plasma and therefore the applications of the treated materials. Nitrogen plasma can integrate functional groups such as primary amines and carbon dioxide plasma can incorporate carboxylic groups on the surface of polymers. For specifi…
Optical second-harmonic generation (SHG) is used as a noninvasive probe of the interfaces of Si nanocrystals (NCs) embedded uniformly in an ${\mathrm{S}\mathrm{i}\mathrm{O}}_{2}$ matrix. Measurements of the generated SH mode verify that the second-harmonic polarization has a nonlocal dipole form proportional to $(\sta…
The possibility of negative optical path length in left-handed media (LHM) is shown to lead to complete suppression of spontaneous emission of an atom in front of a mirror with a layer of LHM. For the same reason two atoms put at the foci of a perfect lens formed by a parallel LHM slab [J. B. Pendry, Phys. Rev. Lett.…
Polarized Raman scattering on single crystals of has been used to determine the symmetry properties and frequencies of the Raman-active vibrational modes over the temperature range from 300 to 425 K, i.e., up to the melting point . Significant softening (by up to 6%) is observed in the modes involving rigid translatio…
Polymer brushes are grown on both hydrophobic and hydrophilic nanocrystals by surface-initiated atom-transfer radical polymerization. The poly{[2-(dimethylamino)ethyl] methacrylate}-coated nanocrystals are well dispersed in both water and most organic solvents without detectable aggregation and deterioration of their…
We report on the optimization of the upconversion photoluminescence in films of conjugated polymers doped with platinum porphyrin. The upconversion emission was observed to take place at pump intensities as low as 0.5kW∕cm2. Comparison between the photoluminescence integral intensity of polyfluorene and ladder-type pe…
We perform analysis of the band structure, phonon dispersion, and electron-phonon interactions in three types of small-radius carbon nanotubes. We find that the (5,5) nanotube can be described well by the zone-folding method and the electron-phonon interaction is too small to support either a charge-density wave or su…
Using x-ray and neutron scattering, we have studied the structural and magnetic properties of the single-layer manganite ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{1+x}{\mathrm{MnO}}_{4}(0\ensuremath{\leqslant}x<0.7)$. Single crystals were grown by the floating-zone method at $18\phantom{\rule{0.3em}{0ex}}\mat…