Materials Literature
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The kinetics of electric-field-induced ferroelectric phase transitions in relaxor ferroelectrics observed recently [S. B. Vakhrushev, J. M. Kiat, and B. Dkhil, Solid State Commun. 103, 477 (1997); B. Dkhil and J. M. Kiat, J. Appl. Phys. 90, 4676 (2001)] is analyzed in the framework of a dynamical model of relaxors whi…
This work reports how resonance Raman experiments are used to study details of the electronic structure of individual single-wall carbon nanotubes (SWNTs) by measuring the phonon spectra and how the quantized electronic structure affects the dispersive Raman features of SWNTs. We focus our analysis on the dispersive D…
The crystal structure of cadmium cyanamide was investigated by X-ray powder analysis and refined using the Rietveld method. Very fine powders of CdCN2 in the nanometre range were obtained by chemical bath deposition. The size, shape and microstrain were characterised by X-ray diffraction and transmission electron micr…
The present paper focuses on the redox properties of perovskite-related oxides and presents a solution model that connects integral thermodynamic properties that are measured calorimetrically with partial thermodynamic quantities that are measured by equilibration methods. The model allows us to extract significant fe…
An updating of photon transport modelling in tissues is carried out by including the effect of molecular interference in the coherent (Rayleigh) scattering. To this end, the present tabulations--which permit us to obtain the linear differential scattering coefficient of compounds from a simple weighted sum of the elem…
First-principles electronic structure calculations were carried out for the paraelectric and ferroelectric phases of ${\mathrm{KH}}_{2}{\mathrm{PO}}_{4}$ using the pseudopotential method. The calculated structures are in good agreement with experiment. The calculations reveal that the distance \ensuremath{\delta} betw…
Neutron-scattering experiments were performed on liquid ${\mathrm{Al}}_{88.5}({\mathrm{Mn}}_{x}{\mathrm{Cr}}_{1\ensuremath{-}x}{)}_{11.5}$ alloys $(0<~x<~1),$ giving rise to equilibria with $\ensuremath{\mu}$ phase compounds whose structure is closely related to those of quasicrystalline phases. Assuming a Mn/Cr…
Water-soluble, core-modified porphyrins were prepared and evaluated as sensitizers for photodynamic therapy (PDT). The addition of an aromatic aldehyde to 2,5-dilithiothiophene or -selenophene gave diol 3 as a nearly equimolar mixture of meso and d,l diastereomers, which gave a single diastereomer following careful re…
A recent density functional theory is used to investigate the free interface between demixed fluid phases in a model colloid-polymer mixture. Both the colloid and polymer density profiles oscillate on the colloid-rich side of the interface, provided the polymer reservoir packing fraction η p r is sufficiently high. Re…
Abstract Nonspherical polystyrene (PS)/poly (n ‐butyl methacrylate) (PBMA) composite particles with uneven surfaces were produced by seeded dispersion polymerization of BMA with 1.65‐μm, monodisperse, spherical PS seed particles. The composite particles consisted of a PS core and an incomplete PBMA shell. The formatio…
Powder neutron diffraction and molecular dynamics (MD) simulations have been used to investigate the structural behaviour of silver sulfide, Ag 2 S, at elevated temperatures. Above ~450 K Ag 2 S adopts the β phase in which the S 2- possess a body-centred cubic arrangement. Analysis of the neutron diffraction is in goo…
[structure: see text] A new principle for the design of discotic nematic liquid crystals is presented. The first examples of compounds which contain two triphenylene discotic mesogens connected via a rigid pi-conjugated diacetylene spacer are reported. These discotic twins form a discotic nematic mesophase over a wide…
A beta-cyclodextrin dimer is found to be effective in preparing a layer-by-layer architecture of positively charged ferrocene-appended poly(allylamine) presumably on the basis of strong beta-cyclodextrin-ferrocene host-guest interaction.
Abstract Thermoplastic elastomeric compositions from reclaimed rubber and scrap plastics were prepared. The physical properties, dynamic mechanical properties, rheological behavior, and phase morphology of the blends were studied. A 50:50 rubber/plastic ratio was found to be the best for processability, ultimate elong…
The analysis of partial discharge signals is a well-known tool to monitor the degradation of electric equipment. In contrast to the common practice of the analysis of data sets (phase angles of occurrence and discharge magnitudes) accumulated during a predefined time interval, the Pulse Sequence Analysis (PSA) is base…
A new Li/Al layered double hydroxide, [LiAl 2 (OH) 6 ]Cl·2H 2 O, having a rhombohedral layer stacking sequence has been synthesized by the reaction of the Al(OH) 3 polymorphs, bayerite and nordstrandite, with LiCl. As is the case with the hexagonal analogue, rhombohedral [LiAl 2 (OH) 6 ]Cl·2H 2 O has been found to rea…
Thin gold films are grown on Si and Ge substrates by galvanic displacement from fluoride-containing solutions. The physical and chemical properties of the metal−semiconductor interface are characterized by a variety of techniques, including photoelectron spectroscopy, atomic force microscopy, and electron microscopy.…
The nature of the superconducting state in quasi-one-dimensional organic conductors has remained controversial since its discovery. Here we present results of (77)Se NMR Knight shift (K(s)) experiments in (TMTSF)(2)PF(6) under 7 kbar of pressure with a magnetic field aligned along the most conducting a axis. We find n…
The crystal structures in both irradiated and nonirradiated states of a photoinduced molecular switch based on the spin-crossover phenomenon are presented. From the structural point of view, the light-induced metastable high-spin state of the spin-crossover complex [Fe(phen)2(NCS)2] (phen = 1,10-phenanthroline) shows…
Ferroelectric BaFe 0.5 Nb 0.5 O 3 (BFN) ceramic is synthesized by the solid-state reaction technique for the first time. The x-ray diffraction of the sample at room temperature shows a monoclinic phase. Dielectric studies of the sample show a frequency dependence of the temperatures at which the dielectric permittivit…