Materials Literature
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Microstructural evolution during simple solid‐state sintering of two‐dimensional compacts of elongated particles packed in different arrangements was simulated using a kinetic, Monte Carlo model. The model used simulates curvature‐driven grain growth, pore migration by surface diffusion, vacancy formation, diffusion a…
Highly fluorescent Nile Red (NR) nanoparticles embedded in a hybrid sol-gel glass are reported. The crystallite growth within the confined system created by the porous hybrid matrix results in NR nanoparticles of averaged dimensions below 36 nm. The preparation process allows for the control of both the conformation a…
We have shown that the out-of-equilibrium hexagonal P6∕mmm phase adopts the stoichiometry Sm(Fe,Ga)9 in the Sm–Fe–Ga system. X-ray diffraction analysis has been combined with Mössbauer spectrometry. A specific program for the Wigner–Seitz cell (WSC) volume calculation of the equilibrium and of the metastable structure…
The complex [Mn(dbm)(2)(py)(2)](ClO(4)) (dbm = anion of 1,3-diphenyl-1,3-propanedione (dibenzoylmethane), py = pyridine) was synthesized and characterized by X-ray crystallography. It has tetragonally distorted geometry with the axial positions occupied by the py ligands and the equatorial positions by the dbm ligands…
The E-4,4'-bis[di(p-anisyl)amino]stilbene cation is a class-III mixed-valence species with electronic coupling comparable to that in its biphenyl-bridged analogue, whereas its tolane-bridged analogue belongs to class II.
A near‐single‐phase Ti 3 AlC 2 ternary carbide was synthesized from 3Ti–1.1Al–1.8C powder blend, both by the wave propagation and thermal explosion (TE) modes of self‐propagating high‐temperature synthesis. The application of a moderate (28 MPa) pressure immediately after TE at 800°C (reactive forging) yielded a 95% d…
Self-assembly of hyperbranched polyethylenimine (PEI) and fatty acids leads to supramolecular inverted micellar structures that are able to irreversibly transfer water-soluble guest molecules into organic solvents.
The electronic properties, lattice dynamics, and electron-phonon coupling of boron with $\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{Ga}$ structure are studied as a function of pressure by ab initio calculations. It is found that $\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{Ga}$ boron is dynamically stable at…
Monotonic and cyclic fatigue behavior of single fibers or fiber fabrics are of significant interest, since fiber assemblies or fiber‐reinforced composite materials in structural applications are often subjected to cyclic loading. Studying the cyclic fatigue behavior of fibers is particularly difficult because of their…
Each carbon atom in the graphite crystal has a quadrupole moment due to the symmetry of the crystal. We show that these graphite quadrupoles, along with the polarizability of graphite, have a substantial effect on adsorption of strongly polar molecules. We present an approximate method for accounting for the change in…
We consider orbital-only models in Mott insulators, where the orbital–orbital interactions are either due to Jahn–Teller distortions or due to the Kugel–Khomskii superexchange. This leads to highly anisotropic and frustrated orbital Hamiltonians. For two-fold degenerate e g systems, both types of orbital interactions…
In this paper, the spectroscopic properties of bismuth borate glasses doped with different Nd 3+ concentrations have been investigated. The intensity parameters Ω t ( t =2, 4, 6), spontaneous emission probability, fluorescence lifetime, radiative quantum efficiency, fluorescence branching ratio, and stimulated emissio…
Multiple-wavelength distributed-feedback lasers are made from multilayered composites by utilizing the solution-processing ease of cadmium selenide semiconductor nanocrystals and soft lithography. The Figure shows three types of emission obtained from such structures across a wide range of the visible spectrum: fluore…
Organic molecules have been incorporated into the pore system of mesoporous TiO 2 and ZrO 2 xerogels and thin films. Surface-modifying functions include alkyl, aryl, amino, sulfonate, thiol, and polyol. Phosphate, phosphonate, carboxylate, and polyphenol were used as grafting groups. The incorporation of these functio…
This paper describes the synthesis of core-shell CdSe/CdS quantum dots (QDs) in aqueous solution by a simple photoassisted method. CdSe was prepared from cadmium nitrate and 1,1-dimethylselenourea precursors under illumination for up to 3 h using a pulsed Nd:YAG laser at 532 nm. The effects that the temperature and th…
The aim of this work is to measure the hydrogen transport and solubility parameters in the commercial alumina. Measurements are conducted using a time‐dependent permeation method over the temperature range 1273–1673 K with hydrogen driving pressures in the range 10 4 –10 5 Pa (100–1000 mbar). A half‐power pressure dep…
Abstract This paper discusses the development of a finite volume model for a planar solid oxide fuel cell. Two different levels of detail for the definition of the basic cell elements are considered, the first with the assumption of isothermal behavior for a finite volume, defined by a portion of the cell PEN structur…
A combination of methods, Bragg diffraction, small‐angle X‐ray scattering (SAXS), and transmission electron microscopy, is applied to the characterization of nanodomains and nanocrystals in polymer‐derived ceramics (PDCs). Detailed study of two materials, silicon carbonitride (SiCN) and a SiCN–zirconia nanocomposite,…
CdS/dendrimer nanocomposites can be synthesized from methanolic Cd(2+) and S(2-) with amine-terminated polyamidoamine dendrimers of generation 8 (G8NH(2)) as stabilizers. By controlling the preparation conditions, nanoparticles with diameters < or = 2 nm can be obtained with a narrow size distribution. They show blue…
Abstract The quiescent annealing of four different co‐continuous polystyrene/high‐density polyethylene blends of widely different viscosity ratios were examined at three different temperatures. In addition, the coarsening of a co‐continuous poly(methyl‐methacrylate)/high‐density polyethylene blend was also studied. Si…