Materials Literature
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We present results for the optical absorption spectra of small-diameter single-wall carbon and boron nitride nanotubes obtained by {\it ab initio} calculations in the framework of time-dependent density functional theory. We compare the results with those obtained for the corresponding layered structures, i.e. the gra…
Magnetic junction is considered which consists of two ferromagnetic metal layers, a thin nonmagnetic spacer in between, and nonmagnetic lead. Theory is developed of a magnetization reversal due to spin injection in the junction. Spin-polarized current is perpendicular to the interfaces. One of the ferromagnetic layers…
The path integral formalism is applied to derive the full partition function of a generalized Su-Schrieffer-Heeger Hamiltonian describing a particle motion in a bath of oscillators. The electronic correlations are computed versus temperature for some choices of oscillators energies. We study the perturbing effect of a…
We present first-principles calculations of ballistic spin injection in Fe/GaAs and Fe/ZnSe junctions with orientation (001), (111), and (110). We find that the symmetry mismatch of the Fe minority-spin states with the semiconductor conduction states can lead to extremely high spin polarization of the current through…
An electromagnetic (EM) Bloch wave propagating in a photonic crystal (PC) is characterized by the immittance (impedance and admittance) of the wave. The immittance is used to investigate transmission and reflection at a surface or an interface of the PC. In particular, the general properties of immittance are useful f…
Carrier-mediated ferromagnetism in a dilute magnetic semiconductor has been studied using i) a single-impurity based generalized RKKY approach which goes beyond linear response theory, and ii) a mean-field-plus-spin-fluctuation (MF+SF) approach within a (purely fermionic) Hubbard-model representation of the magnetic i…
The electron density, its gradient, and the Kohn-Sham orbital kinetic energy density are the local ingredients of a meta-generalized gradient approximation (meta-GGA). We construct a meta-GGA density functional for the exchange-correlation energy that satisfies exact constraints without empirical parameters. The excha…
We study the shape and growth rate of necks between sintered spheres with dissolution-precipitation dynamics in the reaction-limited regime. We determine the critical shape that separates those initial neck shapes that can sinter from those that necessarily dissolve, as well as the asymptotic evolving shape of sinters…
In this paper we discuss the phenomenon of resonance that we predict will occur when a superconducting coil is submitted simultaneously to a magnetic field and to an external force. When both the force and the magnetic field are constant in time the coil should oscillate mechanically around an equilibrium position lik…
The crystal and magnetic structures of ${\mathrm{LaTiO}}_{3}$ have been studied by x-ray and neutron-diffraction techniques using nearly stoichiometric samples. We find a strong structural anomaly near the antiferromagnetic ordering ${T}_{N}=146\mathrm{K}.$ In addition, the octahedra in ${\mathrm{LaTiO}}_{3}$ exhibit…
Two macromonomers containing ethylene oxide (EO) segments with different degrees of polymerization (DP PEO = 5 and 23), capped by a methoxy and a methacrylate group (PEOMA), were polymerized by atom transfer radical polymerization (ATRP) in organic solvents. In addition to the direct preparation of densely grafted bru…
We report here on a theoretical model for the electronic structure and transport properties of superlattice nanowires, considering their cylindrical wire boundary and multiple anisotropic carrier pockets. The thermoelectric properties of superlattice nanowires made of various lead salts (PbS, PbSe, and PbTe) are inves…
Porous and high-surface-area materials are of interest to many scientific communities. Templating pathways can be used to synthesize such materials with a high degree of control over their structural and textural properties. As templates molecular or supramolecular units are added to the synthesis mixture. They are oc…
ADVERTISEMENT RETURN TO ISSUEPREVAddition & Corre...Addition & CorrectionORIGINAL ARTICLEThis notice is a correctionEnhancing the Activity of Fuel-cell Reactions by Designing Three-dimensional Nanostructured Architectures: Catalyst-modified Carbon−Silica Composite AerogelsM. L. Anderson, R. M. Stroud, and D. R. Roliso…
In this paper, we analyze the light transmission from a twisted nematic liquid crystal (NLC) and we propose two accurate and very direct optical methods to measure the azimuthal anchoring energy. In both of them, a monochromatic beam of wavelength lambda with a polarization vector that rotates at an angular frequency…
Abstract Epoxy–clay nanocomposites were synthesized using two organoclays cured with different chemicals at different temperatures. Interlayer distance of the clay layers and curing process were investigated by X‐ray diffraction and infrared spectra. The clay treated with facilitated curing agent, 2,4,6‐tris[(dimethyl…
This paper reports the characterization of a photosensitive benzocyclobutene (BCB), a low dielectric constant spin‐on polymer for use as interlayer dielectric in the microelectronics industry. Research work is divided into three main sections. First, BCB thin film characterization was done to investigate the effects o…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTStumuli-Responsive Organogel Based on Poly(N-propargylamide)Ryoji Nomura, Katsuhiro Yamada, Junichi Tabei, Yoshihito Takakura, Toshikazu Takigawa, and Toshio MasudaView Author Information Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 6…
Abstract Blown extruded polyethylene films without stabilizers have been exposed outdoors under severe weathering conditions in the Sahara. The chemical aspect of aging has been followed by IR spectroscopy. The mechanical aspect of aging has been monitored by means of a nondestructive method. It consists of measuring…
Additives in Water-borne Coatings covers both current technology and the future prognosis for the key additives used in water-borne coatings today. It brings together international experts to provide a comprehensive, practical overview of the field, its direction, and selection of key additives currently employed for…