Materials Literature
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Abstract The interaction between lanthanide ions Ln III (Ln = La, Nd, Sm–Dy, Er, Yb) and nitrate ions is investigated by FT‐IR spectroscopy in dilute anhydrous MeCN solution. The work is performed for ratios R = [NO ] t /[Ln III ] t ranging from 0 to 8 and for solutions generally 0.05 M in Ln III , prepared from anhyd…
Abstract The synthesis and luminescence properties are reported for 20 different chelates composed of 2,2′:6′,2″‐terpyridine as the energy‐absorbing and donating group, Eu III and Tb III as the emitting ions, methylenenitrilo(acetic acids) as the stabel chelate‐forming moieties, and isothiocyanato or(4,6‐dichloro‐1,3,…
In order to study the effect of varying chirality on re-entrant phenomena in liquid crystals, we determined temperature-chirality-chain-length phase surfaces for phase transitions in mixtures of racemic and enantiomeric compounds belonging to a novel AZY series. We observed that the location of the chiral nematic-part…
The equilibrium configuration for the core of a (010) screw dislocation in an anthracene crystal was calculated using the atom-atom potential method. It was strongly anisotropic and complicated due to the characteristic shape and dimension of the molecule. The core region did not spread as much as that of a (010)(001)…
The heats of eutectic melting and devitrification, and the specific heats of the crystalline, glass, and liquid phases have been measured for a Ni24Zr76 alloy. The data are used to calculate the Gibbs free-energy difference, ΔGAC, between the real glass and the crystal on an assumption that the liquid-glass transition…
Abstract The crystallization of poly(ethylene terephthalate) (PET) in blends with naturally functionalized triglyceride oils and their networks has been investigated. Crystallization kinetics of PET in the presence of small amounts of castor oil is improved, both in cooling from the melt state, and in heating from the…
The electrical properties of Co1−xZnxFe2O4 (x=0–1) spinel ferrites were investigated by impedance spectroscopy. The grain-boundary resistance was found to increase as a function of composition up to x=0.6, and decreases beyond x=0.6. The variation in the bulk resistance and the activation energy as a function of compo…
A two-dimensional finite element model has been developed for the reactor of W. L. Hsu [Appl. Phys. Lett. 59, 1427 (1991)], focusing on the relative importance of heterogeneous and homogeneous chemistry in the production of atomic hydrogen. Although hot-filament reactors have been the subject of extensive modeling eff…
Equilibrium shapes of a smectic-A phase grown from an isotropic phase have been investigated. An integral equation which describes the equilibrium shapes is derived by taking account of the difference in Gibbs free energy between the smectic-A and the isotropic phase, a curvature elastic energy of the smectic-A phase,…
Time resolved photoluminescence of porous silicon at room temperature was measured for several emission energies under 2 ns nitrogen laser excitation. For each emission energy studied there is a broad distribution of lifetimes extending over a few decades. The mean value of the distribution varies with the emission en…
The effects of mask alignment and etch-depth errors in the array uniformity error U and diffraction efficiency eta of multilevel-grating array illuminators are evaluated numerically. Also demonstrated are 16-level fan-out elements with array size up to 32 x 16, with U = 5%-10% and eta = 83%-92%. These are fabricated w…
Silica Gel--Its History and Formation. The Production of Silica Gel. Test Procedures and LC Column Packing. The Silica Gel Surface. The Exclusion Properties of Silica Gel. Solvent/Solute Interactions with the Silica Gel Surface. An Introduction to Bonded Phases. The Synthesis of Bonded Phases. The Characteristics of R…
Abstract The effect of peroxide and coagent, alone and together, on the crosslinking of HDPE during melt extrusion was studied. The melt flow index decreased rapidly with peroxide (1,3‐bis ( t ‐butylperoxy‐isopropyl) benzene), and smoothly with trimethylolpropanetriacrylate (TMPTA), but showed a small increase with pa…
Continuous surface-relief diffractive optical elements for two-dimensional array generation (fan-out) are designed and fabricated. Separable and nonseparable solutions for the two-dimensional element design are compared. The phase-grating microstructures are generated by laser-beam writing lithography in a single expo…
Oriented In2O3 films have been grown on (001) InAs, MgO, and YSZ substrates using pulsed laser deposition. The films in each case displayed a cube-on-cube orientation relation with respect to the substrate, as determined by in situ RHEED analysis and x-ray θ–2θ measurements. X-ray rocking curve full width at half-maxi…
An equilibrium uniaxial dodecagonal quasicrystal is reported to be formed by a freezing simple monatomic liquid in a molecular dynamics simulation. Its diffraction pattern closely resembles that of the dodecagonal quasicrystalline phase formed in ${\mathrm{V}}_{3}$${\mathrm{Ni}}_{2}$ and ${\mathrm{V}}_{15}$${\mathrm{N…
A novel thoretical treatment of antireflection-structured surfaces possessing general one-dimensional continuous profiles is presented. Closed-form solutions for the field reflection coefficients of these antireflection-structured surfaces are obtained through the use of effective medium theory and tapered transmissio…
Abstract A review of theoretical equations of state for polymer liquids is presented. Characteristic parameters for six equations of state, as well as parameters for the empirical Tait equation, are given for 56 polymers where pressure–volume–temperature (PVT) data over a wide range of conditions could be found in the…
The guided-mode resonance properties of planar dielectric waveguide gratings are presented and explained. It is shown that these structures function as filters that produce complete exchange of energy between forward- and backward-propagating diffracted waves with smooth line shapes and arbitrarily narrow filter linew…
Abstract The impetus for this work stems from the need to predict the field performance of a class of heavy oil reservoirs described as "foamy oil" reservoirs. Foamy oil reservoirs exhibit better than expected primary performance. Foamy oil reservoirs deliver greater primary recovery with less reservoir pressure decli…