Materials Literature
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With 14.4 million tons produced in 1993, purified terephthalic acid (PTA) and dimethylterephthalate (DMT) are the main monomers used in the world polyester production. Even though there are ten industrial digestors treating the effluents of both products, little is known about the influence of their organic components…
Order−disorder transition, microdomain structure, and phase behavior in binary mixtures of low molecular weight polystyrene- block -polyisoprene (SI diblock) copolymers were investigated. For the study, four SI diblock copolymers were synthesized, namely (i) SI-Q having a weight-average molecular weight ( M w ) of 2.8…
We use the Landau-de Gennes theory of a nematic liquid crystal to investigate anew aspects of the properties of the interface between the isotropic and nematic liquid crystal phases of the same fluid. The equations of the static interface have been solved, both numerically and using asymptotic analysis, with an emphas…
A strong photoluminescence (PL) with a peak position of ∼420 nm (2.95 eV) under exciting radiation of λ=300 nm, and two new luminescence peaks at ∼420 and 470 nm, under λ=633 nm excitation at room temperature are observed, evidently for Ge nanocrystallites embedded in SiO2 thin films (Ge–SiO2) prepared by the ion-beam…
Using a new numerical scheme of dynamical mean field theory, we investigate the kinetics of a grafting reaction of end-functionalized polymers onto a solid surface. We calculate the time evolution of the reaction rate and density profiles during the grafting reaction.
Neodymium-doped silica glass possesses many properties ideal for high-power laser applications. These include low thermal expansion coefficient, high temperature stability, and low nonlinear index of refraction. For the first time, the sol-gel process has been successfully employed to prepare highly doped neodymia sil…
The National Institute of Standards and Technology (NIST) has developed a nominally quarter-wave linear retarder for wavelengths near 1.3 mum that is stable within +/-0.1 degrees retardance over a range of wavelength, input angle, temperature, and environmental variations. The device consists of two concatenated Fresn…
The parameters in the Sellmeier equation for langasite are accurately obtained on the basis of the measurement of the ordinary and extraordinary refractive indices in the region of 500 nm to 2500 nm, and the phase-matching of langasite is investigated. The second harmonic generation (SHG) of langasite is also examined…
Corrosion potential transients were associated with nucleation and propagation of stress corrosion cracks in a 17-4 precipitation-hardenable (PH) martensitic stainless steel (SS) during slow strain rate tests (SSRT) at 90°C in deaerated sodium chloride (NaCl) solutions. Test solutions included 20 wt% NaCl at pH 3 and…
The ferroelectric fatigue behavior of high‐displacement reduced and internally biased oxide wafer (RAINBOW) actuators was investigated and compared with that of conventional bulk ceramics. Piezoelectric lead zirconate titanates (PZT‐5H and PZT‐5A) as well as electrostrictive lead lanthanum zirconate titanate (PLZT 9/6…
Using a model for the electric field built up in insulating materials irradiated by electrons, a Monte Carlo simulation method has been applied to the binary oxides Al2O3, MgO, SiO2, Y2O3 and Nb2O5. The results show the alteration of the shape of the depth distribution of characteristic x-ray production, the Φ(ρz) fun…
PURPOSE: The reproductive toxicology of mangafodipir trisodium (MnDPDP, Teslascan), a new hepatobiliary MR contrast agent, was evaluated in rats and rabbits. MATERIAL AND METHODS: Male and female fertility and post-natal development were examined in rats after repeated i.v. injections of MnDPDP. The developmental toxi…
The objective of this article is to give the nonspecialist some helpful insights into the problems commonly encountered in solution crystallization and to offer a brief update on what is new. The text is in two main parts: an overview of the fundamentals which includes some basic guidelines for process development and…
PURPOSE: To investigate the general toxicology of mangafodipir trisodium (MnDPDP, Teslascan). MATERIAL AND METHODS: Studies were performed in accordance with standard methods and in compliance with regulations current at the time of conduct. RESULTS: Single-dose studies in rodents and dogs showed that MnDPDP was toler…
The refractive index and the nonlinear optical properties of sodium silicate glass can be easily tailored by replacing the sodium with silver. However, the thermal responses of silver and the corresponding modifications of the silica (SiO 2 ) network in ion‐exchanged glass under heating are still not clear. X‐ray phot…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Time-Resolved Electron Paramagnetic Resonance Study of Excited Triplet Porphyrins in Fluid SolutionJun-ichi Fujisawa, Yasunori Ohba, and Seigo YamauchiView Author Information Institute for Chemical Reaction Science Tohoku University Katahira 2-1-1, Aoba-ku, Sendai 98…
A kinetic investigation of the selective catalytic reduction (SCR) of nitric oxide (NO) by propylene (C 3 H 6 ) was conducted over a 0.8 wt % Pt/Al 2 O 3 catalyst in the temperature range of 200−500 °C. The results indicate the presence of two kinetically distinct regions at temperatures above and below the temperatur…
In this paper, a transient response analysis is developed by combining a broadened pulse with a step change or an isotopic pulse. The combined method provides information about the activation of the catalyst and the catalytic reaction mechanism. The method is applied to the CO 2 reforming of methane over NiO/SiO 2 at…
A method for designing antireflection coatings by the use of an absorbing layer and a dielectric layer is proposed. Theoretical and experimental results of three two-layer wideband antireflection coatings with Au, Cu, and TiO(x)N(y) are given. The antireflection coatings have low reflectance, good conductivity, and a…
We measured the O 1s and Ti 2p X-Ray Absorption Spectroscopy (XAS) spectra of a series of ternary Ti oxides. The spectra of A12TiO5 are compared to those of TiO2 and the physical mixture TiO2–Al2O3. The spectra reflect important differences in the electronic structure caused by changes in the chemical bonding. It is a…