Materials Literature
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The geometrical optics design of a focusing grating coupler (FGC) is discussed for the situation in which the shape of the guided and free-space pencil and the diffraction geometry are general. A function that describes the so-called optical path-length defect in a general point of the FGC yields the spatial frequency…
The activation energy ΔH∗ for forming a kink pair of trapezoidal shape in a dislocation in a Peierls potential is calculated by considering the long-range elastic interaction between the dislocation segments. The shapes and energies obtained in this three-parameter model closely resemble those obtained from the contin…
A method for calculating ``constant volume'' pair potentials in Al-rich transition-metal compounds is presented. The method is based on a combination of a Green's-function analysis of the interaction between transition-metal d shells, and a perturbative treatment of the Al and transition-metal pseudopotentials. In add…
XPS data have been obtained from a polycrystalline Ag foil supplied by AESAR. Initial data indicates a highly contaminated surface region. The foil was heated to 250° C and then sputtered with a 2 keV beam of Ar+ for 35 min. Ion scattering spectroscopy, angle-resolved Auger electron spectroscopy, and x-ray photoelectr…
The thickness and optical properties of polyaniline films deposited on gold substrates by electropolymerization were determined using in situ spectroscopic ellipsometry. The polymer films were deposited by potential cycling in 0.1 M aniline/ 1 M H 2 SO 4 . For the simultaneous determination of optical properties and t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Property of Polymer Films with Fluoroalkyl Side ChainsY. Katano, H. Tomono, and T. NakajimaCite this: Macromolecules 1994, 27, 8, 2342–2344Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 April 1994https://pubs.a…
The photoelectrochemical oxidation and dissolution of silicon has been investigated in the absence of water and oxygen. The etch rate and photocurrent for n‐Si in an anhydrous, HF ‐ acetonitrile solution were directly proportional to light intensity. Four electrons were transferred per silicon oxidized, with a quantum…
A soluble polyphosphatase of Saccharomyces cerevisiae, purified to apparent homogeneity, is monomeric with a molecular mass of 40 kDa. It acts as an exoenzyme in a processive mode releasing orthophosphate residues from long polyphosphate chains until pyrophosphate is reached. Polyphosphates of all the lengths examined…
Abstract We have investigated the impact of surface reactions such as NH 3 decomposition and radical adsorption on quartz flow reactor data for Thermal DeNO x using a model that accounts for surface chemistry as well as molecular transport. Our calculations support experimental observations that surface effects are no…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEntropic Corrections to the Flory-Huggins Theory of Polymer Blends: Architectural and Conformational EffectsGlenn H. Fredrickson, Andrea J. Liu, and Frank S. BatesCite this: Macromolecules 1994, 27, 9, 2503–2511Publication Date (Print):April 1, 1994Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExtended X-ray Absorption Fine Structure (EXAFS) Analysis of Disorder and Multiple-Scattering in Complex Crystalline SolidsP. A. O'Day, J. J. Rehr, S. I. Zabinsky, and G. E. Jr. BrownCite this: J. Am. Chem. Soc. 1994, 116, 7, 2938–2949Publication Date (Print):April 1, 1994Pu…
The electronic structure of the transition-metal compounds is discussed with nickel oxide (NiO) serving as the prime example. Other systems are also discussed, especially the high-temperature superconductors. The main finding of the review from the inspection of many data is that the electronic structure of these comp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Structure Determination from Powder Diffraction Data by Monte Carlo MethodsKenneth D. M. Harris, Maryjane Tremayne, Philip Lightfoot, and Peter G. BruceCite this: J. Am. Chem. Soc. 1994, 116, 8, 3543–3547Publication Date (Print):April 1, 1994Publication History Publi…
Six series of a family of non-symmetric dimers, the α-(4-cyanobiphenyl-4′-yloxy)-ω-(4-n-alkylanilinebenzylidene-4′-oxy)alkanes, have been prepared. In three of the series, the number of methylene groups in the flexible alkyl spacer has been varied from 3 to 12 while the terminal alkyl chain is held constant at either…
The structure of beta-isotactipc olypropylene (beta-iPP) as been investigated taking into consideration X-ray and electron-diffraction data supplemented by packing energy calculations. The structure is \ncharacterized by extensive disorder, and two structural models can be envisaged both are based on domains of he…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain Architecture and Asymmetry in Copolymer MicrophasesScott T. MilnerCite this: Macromolecules 1994, 27, 8, 2333–2335Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 April 1994https://pubs.acs.org/doi/10.1021/ma00086a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXAFS Study of Ti-Silicalite: Structure of Framework Ti(IV) in the Presence and Absence of Reactive Molecules (H2O, NH3) and Comparison with Ultraviolet-Visible and IR ResultsS. Bordiga, S. Coluccia, C. Lamberti, L. Marchese, A. Zecchina, F. Boscherini, F. Buffa, F. Genoni, G…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTClay-Polymer Nanocomposites Formed from Acidic Derivatives of Montmorillonite and an Epoxy ResinMuh S. Wang and Thomas J. PinnavaiaCite this: Chem. Mater. 1994, 6, 4, 468–474Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue…
This paper describes the principle of the pulsed electroacoustic (PEA) method, which was developed a few years ago for profiling the space charge distribution in an acoustically homogeneous solid material. Initially the PEA method could indicate the space charge distribution in the materials only indirectly. Some data…
A structural phase transition between the cubic (space group, Fm 3 m) and tetragonal (space group, P 4 2 /nmc) phases in a zirconia–ceria solid solution (Zr 1−x Ce x O 2 ) has been observed by Raman spectroscopy. The cubic–tetragonal ( c–t″ ) phase boundary in compositionally homogeneous samples exists at a compositio…