Materials Literature
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Heterogeneous catalytic reactions involved in the vapor−liquid−solid (VLS) or solution−liquid−solid (SLS) growth of 1-D nanostructures have been intensively investigated in recent years. But how to control the homogeneous catalytic route and apply it to design new structures of materials has rarely been discussed. In…
Hybrid fuel-cell–gas-turbine (FC/GT) systems are technologically advanced systems that are promising for electric power generation with ultralow emissions and high efficiency for a large range of power plant sizes. A good understanding of the steady-state and dynamic performance of a FC/GT system is needed in order to…
A recently developed multiscale coarse-graining procedure [Izvekov, S.; Voth, G. A. J. Phys. Chem. B 2005, 109, 2469] is extended to derive coarse-grained models for nanoparticles. The methodology is applied to C(60) and to carbonaceous nanoparticles produced in combustion environments. The coarse-graining of the inte…
The colloidal stability, phase behavior, and solubility of silica nanoparticles (3-10 nm) that are formed in basic solutions of monovalent cations (primarily tetrapropylammonium) are investigated using a combination of chemical equilibria and electrostatic models. The free-energy gain associated with the formation of…
We investigated the effect of humidity on the electrical transport properties of single-walled carbon nanotube field effect transistors (SWNT-FETs). Water molecules are found to behave as electron donors to the nanotube: Current through the p-type carbon nanotube device is found to decrease under a modest humidity, an…
A thermodynamic model is presented that describes the polarization and the dielectric response of ferroelectric-paraelectric bilayers and multilayers. It is shown that a strong electrostatic coupling between the layers results in the suppression of ferroelectricity at a critical paraelectric layer thickness. The bilay…
The formation of CdS nanotetrahedrons, pencil-shaped nanorods, tetrapods, prickly spheres, and high aspect-ratio hexagonal nanoprisms has been, respectively, achieved by adjusting the ratio of two solvents ethylenediamine and ethylene glycol under the solvothermal condition. None of the surfactants or other templates…
We analyze the jamming transition that occurs as a function of increasing packing density in a disordered two-dimensional assembly of disks at zero temperature for "Point J" of the recently proposed jamming phase diagram. We measure the total number of moving disks and the transverse length of the moving region, and f…
Symmetry and physical aspects of 'forbidden' reflections excited by a local polarization anisotropy of the X-ray susceptibility are surveyed. Such reflections are observed near absorption edges where the anisotropy is caused by distortions of the atomic electronic states owing to interaction with neighbouring atoms. A…
We report on a specific growth procedure combining low-temperature growth of ZnMgO and postgrowth annealing at intermediate temperatures. Despite the large lattice misfit induced by the sapphire substrate, layer-by-layer growth is accomplished up to the phase-separation limit found at a c-lattice constant of 0.5136nm…
Carbon nanotube (CNT)‐dispersed Si 3 N 4 ceramics with electrical conductivity were developed based on the lower temperature densification technique, in which the key point is the addition of both TiO 2 and AlN as well as Y 2 O 3 and Al 2 O 3 as sintering aids. This new ceramic with a small amount of CNTs exhibits ver…
The evolution of the density of states (DOS) and conductivity as a function of well-controlled doping levels in ${\mathrm{OC}}_{1}{\mathrm{C}}_{10}$-poly($p$-phenylene vinylene) [${\mathrm{OC}}_{1}{\mathrm{C}}_{10}$-PPV] doped by ${\mathrm{FeCl}}_{3}$ and ${\mathrm{PF}}_{6}$, and ${\mathrm{PF}}_{6}$-doped polypyrrole…
The anomalous Hall effect (AHE) of epitaxial SrRuO$_3$ films with varying lattice parameters is investigated, and analyzed according to the Berry-phase scenario. SrRuO$_3$ thin films were deposited on SrTiO$_3$ substrates directly, or using intermediate buffer layers, in order to finely control the epitaxial strain. T…
Spin-wave dispersions in the antiferromagnetic state of single crystal LiFePO$_4$ were determined by inelastic neutron scattering measurements. The dispersion curves measured from the (010) reflection along both {\it a}$^\ast$ and {\it b}$^\ast$ reciprocal-space directions reflect the anisotropic coupling of the layer…
Transparent ceramic materials with optical qualities comparable to single crystals of similar compositions have been developed in recent years, as a result of the improved understanding of powder-processing-fabrication- sintering-property inter-relationships. These high-temperature materials with a range of thermal an…
The adsorption of alkali metals on graphite has been the subject of various studies for the past two decades. Briefly, two main reasons can be offered to justify the persisting interest in these adsorption systems. First, experiments have pointed out intriguing structural phase transitions of the adsorbed species, and…
We report a high-pressure structural sequence with a degree of reversibility for the functionally graded thermoelectric, narrow band-gap semiconductor $\mathrm{Ag}\mathrm{Sb}{\mathrm{Te}}_{2}$, discovered using angle dispersive x-ray diffraction in a diamond anvil cell with synchrotron radiation at room temperature. T…
We present ab initio calculations of conductivity, thermopower, Lorenz factor, and Hall coefficient for doped cobalt antimony skutterudites which are currently investigated experimentally for their thermoelectric properties. The electronic structure is calculated by the full potential linear augmented-plane-wave metho…
We investigate the charge-transfer interfaces between metal and redox arylamine molecular films through studying the current-voltage characteristics of single-layer organic diodes with the aid of anode interfacial engineering method. The diode turn-on voltage is shown to be highly sensitive to the arylamine/metal char…
We consider a slab of a composite left-handed metamaterial with quadratic nonlinear response and discuss the properties of opaque nonlinear left-handed lens. We find the conditions when this left-handed flat lens can create, with a subwavelength resolution, an image of the second-harmonic field of the source being opa…