Materials Literature
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Activated carbon fibers (ACFs) are microporous carbons consisting of a three-dimensional disordered network of nano-graphites with a mean in-plane size of about 30 Å. We investigated the structure, electronic properties and iodine doping effects for ACF samples heat-treated up to 2800° C. The samples heat-treated belo…
The competitive ablation and polymerization (CAP) principle relates the ablation of materials in plasma to the deposition of materials in plasma. Plasma polymerization and plasma treatment cannot be elucidated without consideration of the fragmentation of molecules in both the gas and solid phases. The general fragmen…
By a judicious choice of implantation and annealing conditions, an n-type conducting layer with activation energy of about 0.32 eV has been created in oxygen-implanted diamond. This conclusion was reached as a result of performing three similar implantations in identical, high-purity (type IIa) diamonds. They have bee…
We have measured high resolution absorption spectra for the ${}^{4}{\stackrel{\ensuremath{\rightarrow}}{{I}_{15/2}}}^{4}{I}_{13/2}{,}^{4}{I}_{11/2}$ infrared transitions of ${\mathrm{Er}}^{3+}$ ions in ${\mathrm{LiYF}}_{4}.$ Positions of crystal-field levels and their widths were precisely determined and analyzed. Hyp…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTRational Synthesis of Meso-Substituted Porphyrins Bearing One Nitrogen Heterocyclic GroupDorota Gryko and Jonathan S. LindseyView Author Information Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204 Cite this: J. Org. Chem. 2000, 65, 7…
A novel flame-retardant epoxy resin, (4-diethoxyphosphoryloxyphenoxy)(4-glycidoxyphenoxy)cyclotriphosphazene (PPCTP), was prepared by the reaction of epichlorohydrin with (4-diethoxyphosphoryloxyphenoxy)(4-hydroxyphenoxy)cyclotriphosphazene and was characterized by Fourier transform infrared, 31P NMR, and 1H NMR analy…
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…