Materials Literature
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Three new layered phosphates were isolated by employing high-temperature, solid-state reactions. These compounds belong to the A I 2 B II P 2 O 7 family. Na 2 MnP 2 O 7, 1, crystallizes in the triclinic space group P 1̄ (No. 2) with a = 5.316(2) Å, b = 6.580(2) Å, c = 9.409(3) Å, α = 109.65(3)°, β = 95.25(3)°, γ = 106…
Ruddlesden−Popper (RP) phases with the formula (CaO)(CaMnO 3 ) n, where n = 1, 2, 3, and ∞, have been prepared using the Pechini citrate gel process at temperatures as low as 900 °C under flowing oxygen. The compounds were characterized by X-ray powder diffraction, Rietveld profile analysis, thermal gravimetric analys…
Electroactive polymers from 3-(4-fluorophenyl)thiophene, 3-(4-cyanophenyl)thiophene, 3-(4-methylsulfonylphenyl)thiophene, and 3-(3,4-difluorophenyl)thiophene were electrochemically deposited onto carbon paper electrodes from tetramethylammonium trifluoromethanesulfonate (Me 4 NCF 3 SO 3 )/acetonitrile and/or tetraethy…
We report study of recovery dynamics, followed by in-situ resistivity measurement after 100 MeV oxygen ion irradiation, in cold rolled Fe at 300K. Scaling behavior with microstructural density and temperature of sample have been used to establish stress induced defects formed during irradiation as a new type of sink.…
We describe instrumentation that has been constructed at the National Institute of Standards and Technology (NIST) for measurement of the index of refraction of solid materials in the spectral region from 0.5 micrometer to 1000 micrometer using Fourier-transform based spectrophotometers and etalon samples. Preliminary…
Liquid−liquid equilibrium data for the extraction of cyclohexane + benzene + dimethyl formamide with 10, 20, 30, and 50 mass % ethylene glycol were measured. The NRTL equation was used to correlate the experimental data and to predict the phase composition of the quaternary system. The agreement between the predicted…
This paper describes various methods for the construction of trapped mode solutions within wave guides and along diffraction gratings; in the latter case the solutions are often called Rayleigh–Bloch waves. One of the main results is the explicit construction of a number of new trapped mode solutions within a wave gui…
The supramolecular assembly of octyl-, hexadecyl-, and benzyl-substituted complementary tectonics based upon barbiturates (BA) and 2,4,6-triaminopyrimidines (TP) were studied in bulk, in cyclohexane, and in a polypropylene matrix. As evidenced by means of wide-angle X-ray scattering, FTIR spectroscopy, and atomic forc…
Tris(2-mercaptobenzyl)amine, S 3 N, and tris(2-hydroxybenzyl)amine, O 3 N, were investigated with In 3+ and Ga 3+ in solution and in the solid state to help interpret the contrasting in vivo behavior of their complexes as diagnostic imaging probes. To this end the protonation and metal binding constants were determine…
Following on from previous work on free-base porphyrin, we present the results of a comprehensive study on the structure and inner-hydrogen migration in porphycene, a structural isomer of porphyrin. We used density functional theory with the hybrid B3-LYP exchange-correlation functional, and both the 6-31G(d) and a tr…
An aluminium single crystal of cube orientation has been rolled to 15, 30 and 50% reductions under controlled homogeneous rolling conditions. The deformation structure of the rolled specimens was investigated by both scanning electron microscopy (SEM) and transmission electron microscopy (TEM) over several scales of m…
Using isobaric semigrand Monte Carlo simulations, we have investigated the phase behavior of a model for polydisperse rodlike colloids. The system consists of hard spherocylinders in the limit of infinite aspect ratio, with polydispersity in the length of the particles. If the polydispersity is small (standard deviati…
One of the fundamental problems in simulating the motion of sharp interfaces between immiscible fluids is a description of the transition that occurs when the interfaces merge and reconnect. It is well known that classical methods involving sharp interfaces fail to describe this type of phenomena. Following some previ…
thin films have been prepared firstly by an atmospheric-pressure metal-organic chemical vapour deposition technique. Smooth and polycrystalline films with uniform composition were deposited onto silicon substrates at a substrate temperature of for 1 h and the fully (001)-textured films were obtained with a rapid therm…
In the preceding paper ( Ind. Eng. Chem. Res. 1998, 37, xxxx), linear regressions of the solubility ratio σ with the solute log K ow were examined for 15 water/cosolvent systems and the slopes of the regressions, M or M 0.5, were reported. In this paper, the dependence of M and M 0.5 on the molecular structures and ph…
The surface behavior of 2-, 3-, and 4-pentadecylaniline ( 3a, 3b, and 3c, respectively) was studied at the air−aqueous interface of an acidic subphase. Surface dipole moments (μ n ) were calculated from the surface potentials (Δ V ) of 3a − c and were related to the orientation of the anilinium ion at the interface. F…
The magnetic and magnetoelastic properties of have been investigated. The stable single Laves phase is synthesized at ambient pressure for . The successful formation of this Laves phase can be ascribed to the strong Ce 4f bonding. Spin reorientation is observed around 150 K for Nd stoichiometric concentrations above 0…
We present a selective review of electronic structure calculations for ferromagnetic transition metal alloys. This is work based on the spin density functional theory of the inhomogeneous electron gas which we also discuss briefly. These calculations can be used to provide estimates, from `first principles', of the al…
Films of Ni-7 at% V, Pt, Pd, and , each approximately 100 nm thick, were magnetron-deposited and interposed between about 250 nm thick copper overlayers and single-crystalline substrates. The samples were then annealed in vacuum up to C. The performance of the metal and the tantalum-silicon-nitride films as diffusion…
Polystyrene- block -poly(ethylene- co -butylene)- block -poly(ε-caprolactone) triblock copolymers (SEC) were prepared by hydrogenating polystyrene- block -polybutadiene- block -poly(ε-caprolactone) triblock copolymers (SBC) previously prepared by sequential anionic polymerization. The effect of the crystallization of…