Materials Literature
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The hydrogen-bond patterns in hydrogen phthalates (HP) have been elucidated by the determination of the crystal structures of hydrogen phthalate salts of [Mg(H(2)O)(4)-(CH(3)OH)(2)](2+), 2-(2'-pyridylamine)pyridinium and diethylammonium. The stoichiometry of the latter salt corresponds to a hydrogen phthalate salt; ho…
We perform a Monte Carlo simulation of irreversible template copolymerization near a chemically heterogeneous surface with a regular distribution of discrete adsorption sites that selectively adsorb from solution one of the two polymerizing monomers and the corresponding chain segments. In the polymerization model, th…
We present a simple linear stability analysis of the diffusion equation for nematic polymers that delivers the equilibrium bifurcation diagram for rigid rod, excluded volume potentials. Symmetry properties of the diffusion equation yield insight into invariant subspaces of solutions and allow for interpretation of rec…
Crystal structure determination and analysis have been carried out for the two spin-crossover compounds [Fe(teeX)(6)](BF(4))(2) (teeX is haloethyltetrazole; X = I: teei; X = Br: teeb), in both their high-spin (near 300 K) and their low-spin states (T = 90 K), using high-resolution powder-diffraction data collected at…
The formation of networks is an important step in the synthesis of many biological assemblies. For example, during the synthesis of plant cell walls the factors which dictate the arrangement of the polymeric constituents that make up the cell wall are not yet understood. Factors such as site-directed binding provide a…
Synchrotron X-ray tomography is used to image, at 3.34 μm resolution, a mixture containing high-impact polystyrene (HIPS) and a two-component flame retardant, a brominated phthalimide dimer (Saytex BT-93), and a synergist, antimony oxide (Sb 2 O 3 ). Complete tomography data sets were acquired at seven X-ray energies…
We investigated the effect of magnetic field on the highly correlated metal near the Mott transition in the quasi-two-dimensional layered organic conductor, $\ensuremath{\kappa}\mathrm{\text{\ensuremath{-}}}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\mathrm{\text{\ensuremath{-}}}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{2}\mat…
The synthesis of a narrow band, wide angular aperture 1D grating filter exhibiting close to 100% reflection of a focused beam is developed analytically on the basis of a phenomenological coupled wave representation.
There have been many reports regarding visible luminescence and light emission at 1.54 µm, at room temperature, from porous silicon and from Er-doped porous silicon, respectively. Described is a different approach, based on Raman scattering in porous silicon, to generate radiation at 1.54 µm. Preliminary experimental…
A novel D-pi-A system in which tetrathiafulvalene (TTF) and pi-extended TTFs as strong electron donors are covalently connected to a tricarbonyl (eta(6)-arene)chromium complex as the acceptor moiety through a systematically increased conjugated bridge of vinylene units (12a-c, 16a-c) have been synthesized by Wittig-Ho…
The stability balance among the ferroelectric, ferrielectric, and antiferroelectric phases in dielectric materials has been studied by concretely examining the crystallographic features of $\mathrm{Pb}({\mathrm{Zr}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}){\mathrm{O}}_{3}$ samples with $0.07\ensuremath{\leqslant}x\ensurem…
We present for the first time a theoretical investigation on the reactivity of the different oxygen sites in a dispersed V 2 O 5 /TiO 2 slab model. Our model represents anhydrous conditions and contains all the potentially active oxygen sites proposed to date in the literature: vanadyl V O, bridging V−O−V, interface V…
Molecular mitosis: Figure-eight octaphyrins form binuclear metal complexes that can split into two covalently spiro-linked corrolates. In a unique case binuclear CuII [36]octaphyrin divides thermally into two CuII [18]porphyrins presumably with participation of a transient spirocyclobutane species (see schematic repre…
We describe here an aberration that is frequently encountered with water-immersion but not oil-immersion objectives. The aberration is shown to be induced by tilt of the coverslip out of the plane normal to the optical axis. Model calculations taking into account the path-length distortions introduced by a tilted cove…
The adsorption of poly(vinyl alcohol) (PVOH) from aqueous solutions to a silicon-supported fluoroalkyl monolayer is described. Thickness, wettability, and roughness of adsorbed films are studied as a function of polymer molecular weight, degree of hydrolysis (from the precursor, poly(vinyl acetate)), polymer concentra…
We have systematically investigated transport, magnetic, and structural properties of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ba}}_{x}{\mathrm{CoO}}_{3}$ in the range of doping $0<x\ensuremath{\leqslant}0.55$. In this system, the metal-insulator transition is observed to be coincident with the onset of ferromagne…
In this paper, a systematic study of large-scale production of highly crystalline W 18 O 49 nanoneedles with high aspect ratios using a simple tungsten metal reacting with water at 800−1000 °C has been described. By altering the W source and other experimental conditions, we have generated W 18 O 49 crystals with dive…
We report on photoluminescent properties of ZnO/Zn 0.8 Mg 0.2 O nanorod single-quantum-well structures (SQWs). Catalyst-free metalorganic vapor-phase epitaxy (MOVPE) was employed for precise controls of well widths and compositions of the nanorod SQWs. Both time-integrated and time-resolved photoluminescence (PL) spec…
A systematic sequential procedure is implemented to find local minimum conformers corresponding to the lowest generation (G0), −NH 2 - and −OH-terminated, poly(amidoamine) (PAMAM) dendrimers, and their IR vibrational spectra using ab initio (Hartree−Fock and density functional theory) techniques. It is found that the…
In this study, we investigated the molecular events involved in estrogen-induced angiogenesis. Treatment of the human endometrial adenocarcinoma cells, HEC-1A, with estrogen up-regulated mRNA expression and protein synthesis of various angiogenic factors such as tumor necrosis factor-alpha, interleukin-1, basic fibrob…