Materials Literature
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Recently discovered boron nitride (BN) nanoscale cone particles are shown to consist of an ordered stacking of seamless conical shells. High-resolution transmission electron microscopy and nanobeam electron diffraction allowed the orientation of the BN hexagonal rings to be determined. In all but one case, the results…
Recrystallization and structural recovery in -decay damage in zircon samples have been studied using Raman spectroscopy. Fifteen zircon samples with different degrees of radiation damage have been thermally annealed between 600 K and 1800 K for up to 28 days and 8 hours. The experimental results from this study reveal…
The analysis of Raman spectra obtained for different germanium nanostructures grown on silicon substrates is presented. Comparison of these spectra with a Raman spectrum of a silicon wafer reveals a one-to-one correspondence of features located around 229, 300, and 435 cm−1. It is argued that the peaks observed at the…
We have carried out detailed ab initio electronic structure calculations of a novel thermoelectric compound ${\mathrm{BaBiTe}}_{3}$ and its parent ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3},$ the best room-temperature thermoelectric known to date. The calculations were carried out using the self-consistent full-potential lin…
The objectives of this study were to develop a simple and reproducible method for the preparation of the hydrogel precursor dextran-methacrylate and to conduct a visual observation of the interior structure of the swollen dextran-methacrylate hydrogel with minimum artifacts. A dextran-methacrylate hydrogel precursor w…
Electronic structure has been investigated by reflectivity measurement for ordered-perovskite transition-metal oxides, ${\mathrm{Sr}}_{2}M{\mathrm{MoO}}_{6}$ $(M=\mathrm{Cr},$ Mn, Fe, and Co). The ground states of the Co and Mn compounds are paramagnetic insulators, making a sharp contrast with the ferrimagnetic metal…
Epitaxial Ba1−xSrxTiO3 (BST) thin films have been deposited onto (100)MgO and LaAlO3 substrates using pulsed-laser deposition. Thick (>1 μm) Ag interdigitated capacitors capped with a thin protective layer of Au have been deposited on top of the BST films using electron-beam deposition. The capacitance (C) and…
The theoretical issues addressed in the present volume are semantic and cognitive properties of reciprocal events, syntactic properties of reciprocals, and the relationship of reciprocals to other grammatical categories. Several papers discuss the history of reciprocal constructions, offering alternative hypotheses re…
Coherent one-photon $(2\ensuremath{\omega})$ and two-photon $(\ensuremath{\omega})$ electronic excitations are studied for graphene sheets and for carbon nanotubes using a long-wavelength theory for the low-energy electronic states. For graphene sheets we find that a coherent superposition of these excitations produce…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTReverse Micelle Synthesis and Characterization of ZnSe NanoparticlesForest T. Quinlan, Joerg Kuther, Wolfgang Tremel, Wolfgang Knoll, Subhash Risbud, and Pieter StroeveView Author Information Center on Polymer Interfaces and Macromolecular Assemblies (CPIMA), Department of Chem…
Native and impurity point defects in both yttrium aluminium perovskite (YAP) and garnet (YAG) crystals are studied in the framework of the pair-potential approximation coupled with the shell model description of the lattice ions. The calculated formation energies for native defects suggest that the antisite disorder i…
A description is presented of experimental results, old and new ones, in which a magnetoresistance was discovered, linear in magnetic field. It is explained that there are two theoretical possibilities for such a phenomenon. The first one happens in a polycrystalline metal in a classically large field; it was known si…
The charge ordering phenomena in quasi two-dimensional 1/4-filled organic compounds (ET)_2X (ET=BEDT-TTF) are investigated theoretically for the $\theta$ and $\alpha$-type structures, based on the Hartree approximation for the extended Hubbard models with both on-site and intersite Coulomb interactions. It is found th…
A new optical sensor that uses local plasmon resonance is proposed. A peak that is due to the local plasmon resonance appears in the absorption spectrum of a gold colloid suspension in the visible region, and its height and wavelength depend on the refractive index of the suspension. These properties are used for opti…
The generation of surfaces and interfaces that are able to withstand protein adsorption is a major challenge in the design of blood-contacting materials for both medical implants and bioaffinity sensors. Poly(ethylene glycol)-derived materials are generally considered to be particularly effective candidates for the fa…
First-principles calculations using the full-potential linearized augmented plane-wave method have been performed to investigate detailed electronic and optical properties of ${\mathrm{TiO}}_{2}$ in the anatase structure. The fully optimized structure, obtained by minimizing the total energy and atomic forces, are in…
We present an approach to the implementation of the virtual crystal approximation (VCA) for the study of properties of solid solutions in the context of density-functional methods. Our approach can easily be applied to any type of pseudopotential, and also has the advantage that it can be used to obtain estimates of t…
The crystallization behavior of melt-crystallized poly(phenylene sulfide) (PPS) was studied using time-resolved Fourier transform infrared (FTIR) spectroscopy measurements. The 1073-cm−1 amorphous band was chosen for characterizing the crystallization feature of PPS. The melt-crystallization kinetics suggested three-d…
Various macrokinetic models (the Avrami, Tobin, Malkin, and simultaneous Avrami models) were applied to describe the primary crystallization of syndiotactic polypropylene (sPP) under isothermal conditions. Analysis of the experimental data was carried out using a direct-fitting method such that the experimental data w…
Two chemically modified chain extended/branched polyethylene terephthalate (PET) resins and one unmodified resin, considered to be linear, were characterized in terms of their melt flow, die swell, and viscoelastic properties. The three resins had reportedly similar nominal intrinsic viscosities but exhibited differen…