Materials Literature
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The band gaps, band structure, and excited-state (exciton) energies of CdS, GaAs, and GaP semiconductor clusters are calculated using pseudopotentials. In addition, the sensitivity of the exciton energies to the size, shape, crystal structure, and lattice constant of the unit cell are investigated. The calculated exci…
We review the current theory of intrinsic dielectric loss, that is the loss in a perfect crystal due to anharmonic interaction of a.c. electric field with the phonon system of the crystal. Both ordinary dielectrics and displacive ferroelectrics are considered. The theory predicts dependence of the loss on frequency ω…
The pronounced Lewis acidity explains the exceptional activity of the title compound as catalyst for olefin epoxidations with hydrogen peroxide. The system MTO/ t BuOH/H 2 O 2 transforms olefins selectively and efficiently into epoxides under very mild conditions (−30 to + 60°C, but normally at room temperature). In g…
Starting from a “worst case” corrosion rate prediction with the deWaard-Milliams equation, correction factors can be applied to quantify the influence of environmental parameters and corrosion product scale formed under various conditions. Equations are proposed for each factor. A low-temperature scale formed in conde…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface complexation of colloidal semiconductors strongly enhances interfacial electron-transfer ratesJacques Moser, Swarnalatha Punchihewa, Pierre P. Infelta, and Michael GraetzelCite this: Langmuir 1991, 7, 12, 3012–3018Publication Date (Print):December 1, 1991Publication…
We have investigated the electronic and geometric structure of a thin oxide film grown by oxidation on NiAl(110) using electron spectroscopic techniques, i.e., LEED, EELS, XPS and ARUPS. This film is inert to adsorption of, respectively reaction with many molecules up to temperatures of about 800 K. It is well ordered…
Elements of crystal symmetry: Direct lattice Reciprocal lattice Brillouin zone Crystal structure Point groups Space groups Symmetry of the Brillouin zone Jones zone Surface Brillouin zone Matrix representations of point groups. Lattice dynamics in harmonic approximation - semiclassical treatment: Introduction Lattice…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the validity of Wallach's rule: on the density and stability of racemic crystals compared with their chiral counterpartsCarolyn Pratt Brock, W. Bernd Schweizer, and Jack D. DunitzCite this: J. Am. Chem. Soc. 1991, 113, 26, 9811–9820Publication Date (Print):December 1, 199…
Abstract We report calculations of electron inelastic mean free aths (IMEPs) of 50–2000 eV electrons in a group of 15 inorganic compounds (Al 2 O 3 , GaAs, GaP, InAs, InP, InSb, KCl, LiF, NaCl, PbTe, SiC, Si 3 N 4 , SiO 2 and ZnS). As was found in similar calculations for a group of 27 elements, there are substantial…
Surfaces containing poly(ethylene oxide) (PEO) are interesting biomaterials because they exhibit low degrees of protein adsorption and cell adhesion. In this study different molecular weight PEO molecules were covalently attached to poly(ethylene terephthalate) (PET) films using cyanuric chloride chemistry. Prior to t…
Abstract We report calculations of electron inelastic mean free paths (IMFPs) for 50–2000 eV electrons in a group of 27 elements (C, Mg, Al, Si, Ti, V, Cr, Fe, Ni, Cu, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Ta, W, Re, Os, Ir, Pt, Au and Bi). This work extends our previous calculations ( Surf. Interface Anal. 11, 57 (1988)) fo…
Measurements of the triple differential cross section for inelastic photon scattering from bound atomic electrons are reported. The experiment was done using 148 keV synchrotron radiation from the DORIS storage ring at DESY, Hamburg. The target was an 80 nm thin Cu foil.
We investigate the phase-matching properties and the performances of lithium triborate (LBO) crystals, angle- and temperature-tuned to achieve type-I phase matching for ps, high-power, tunable optical parametric amplification (OPA). A novel retracing behavior was observed in the tuning curves of the LBO OPA.
We have carried out high-resolution photoemission experiments on two quasi-one-dimensional compounds: ${\mathrm{K}}_{0.3}$${\mathrm{MoO}}_{3}$ and (${\mathrm{TaSe}}_{4}$${)}_{2}$I. In both systems, a metal-insulator transition associated with a lattice distortion is reported. We show that the Fermi-step characteristic…
Thermal annealing studies of the photoluminescence (PL) intensity and Fourier-transform infrared spectroscopy have been performed concurrently on porous Si. A sharp reduction in the PL intensity is observed for annealing temperatures ≳300 °C and this coincides with desorption of hydrogen from the SiH2 surface species.…
membrane surface due to diffusion interaction between single channels regarded as bystable functional elements of the whole system, were investigated. The possibility of control over the spatial structures of a cellular membrane was demonstrated.
Abstract Gelatin was graft copolymerized with poly(glycidyl methacrylate) using potassium peroxydisulfate in aqueous medium. Effect of temperature, time, initiator, monomer, and backbone concentrations were studied. The percent grafting was found to increase initially and then decrease in all the cases except with var…
Abstract The formation of certain low molecular weight by‐products during the esterification reaction between ethylene glycol and dimethyl terephthalate was investigated. The result obtained showed that the presence of incorporated diethylene glycol within the polymer led to the formation of low molecular weight side…
Abstract A new variation in the bismaleimide (BMI) resin family, maleimide‐terminated poly(oxy‐1,4‐phenylene sulfonyl‐1,4‐phenylene) oligomers, has been synthesized. The preparation of oligomers ( n = 1–12) is described in this study. The structure of these oligomers is characterized by FT‐IR and NMR spectroscopy. The…
Abstract A study of the effect of crosslinking agents on the structure and properties of the millable polyurethane (PU) elastomer is reported here. Effects of the conventionally used dicumyl peroxide (DCP) and tolylene disocyanate dimer (TDID) on the curing characteristics, mechanical properties, and relative thermal…