Materials Literature
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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…
The influence of the substrate on the morphology of 2D and 3D superlattices made of 5.8 nm silver sulfide nanocrystals coated with dodecanethiol is reported. The two substrates used are highly oriented pyrolytic graphite (HOPG) and molybdenum disulfide (MoS 2 ). The self-assemblies of nanocrystals were characterized w…
Polyaniline (PANI) forms thermoreversible gels in four different sulfonic acids, e.g., dinonylnaphthalene sulfonic acid (DNNSA), dinonylnapthalene disulfonic acid (DNNDSA), ±camphor-10-sulfonic acid (CSA), and dodecyl sulfonic acid (DSA), when made from the formic acid medium. The gelation behavior of 15% PANI−sulfoni…
The synthesis of novel poly(methyl methacrylate)s with starlike architectures by controlled radical polymerization starting from dendritic 2-, 4-, 6-, and 12-arm multifunctional initiators is described. The more highly functionalized initiators were obtained by coupling a bromo-functionalized bis(hydroxymethyl)propion…
Polyethylene (PE) has been and is the most common and most studied polymer. Nevertheless, there is still no full consensus among researchers about such a basic property as the value of its glass tr...
The recycling of ceria-based glass polishing powder by alkali treatment was investigated. Major impurities in the waste, a SiO 2 component from fine glass powder and an Al 2 O 3 component from coagulating agents, could be removed easily at 50−60 °C in a 4 mol kg -1 NaOH solution within 1 h. These impurities react with…
The thermal degradation of natural rubber (NR) in air at a constant heating rate was studied by using of the thermogravimetry (TG) and thermogravimetry and differential thermal analysis (TG–DTA) simultaneous techniques. It indicates that the temperature of thermal degradation of gel and sol of NR rises linearly along…
A photochemical technique for the modification of polyethylene (PE) surfaces was developed. Polyethylene samples were irradiated with UV light in a gas atmosphere containing SO 2 and air to achieve a photosulfonation of the surface. The introduction of sulfonic acid groups (−SO 3 H) onto the PE surface was proved by F…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSelectively Epoxidized Polyisoprene−Polybutadiene Block CopolymersRobert B. Grubbs, Margaret E. Broz, Jennifer M. Dean, and Frank S. BatesView Author Information Department of Chemical Engineering and Material Science, University of…