Materials Literature
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Co(II)‐ and Fe(II)‐phthalocyanines adsorbed on platinum and various carbon electrode surfaces have been studied by spectroelectrochemical techniques. The metallophthalocyanine (MPc) films were prepared on substrate electrodes by a drop‐dry method after dissolving them in pyridine. While not much change in the spectros…
An empirical electrical equivalent circuit for dielectric thin films, based on experimental data, is developed. Current responses to voltage-steps and to voltage-ramps are calculated and compared with experimental data. The simulation allows us to separate current contributions of different physical processes while th…
The surface properties of thin vanadium carbide films, produced on a V(110) surface, have been investigated by using a combination of high-resolution electron energy-loss spectroscopy, fluorescence-yield near-edge x-ray absorption spectroscopy (FYNES), and Auger electron spectroscopy (AES). Our results indicate that t…
ABSTRACT The effect on removing cholesterol from a lard‐water mixture by β‐cyclodextrin (β‐CD) increased with increasing level of β‐CD (1–10%). About 90% of cholesterol was removed from lard by 5%β‐CD with 1: 1 ratio of lard‐to‐water and stirrina at 150 rpm and 27°C for 1 hr. The acid value of β‐CD treated lard was si…
Four siderophores isolated from bacteria have been studied as possible corrosion inhibitors for iron in deareated 1 N HCl . These compounds are aerobactin, enterobactin, parabactin, and rhodotorulic acid. Polarization measurements and ac impedance studies show that all four compounds are inhibitors, with the order of…
The Landau--de Gennes model of the nematic-isotropic phase transition with the inclusion of the density change is examined in a simple way. We show how a density dependent term gives various thermodynamic quantities consistent with both experimental results and with an assumed low value of ${\mathit{T}}_{\mathit{N}\ma…
Monolithic alumina bodies with a grain size of 0.5 μm and submicrometer tetragonal ZrO 2 (3 mol% Y 2 O 3 ) polycrystals were produced and investigated. With decreasing indentation load, the hardness increases but may again decrease below about 5 N; relevant measurements require the application of fairly high loads. De…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIncorporation of Imidazolium Cations into an Enantiomeric Tartrate Host Lattice: Designing New Nonlinear Optical MaterialsJ. Fuller, R. T. Carlin, L. J. Simpson, and T. E. FurtakCite this: Chem. Mater. 1995, 7, 5, 909–919Publication Date (Print):May 1, 1995Publication Histor…
The addition of dicarboxylic acids to polyurethane adhesives, to improve their adhesion to vulcanized synthetic rubbers, may cause the degradation over time of the adhesives. To avoid the degradation of polyurethane adhesives, this study proposes a surface treatment on vulcanized synthetic rubbers with carboxylic acid…
Layered pnictide oxides are an unusual class of compounds which have received little attention. The characteristic feature of these materials is the presence of pnictogen and oxygen atoms which are not bonded to each other and are considered to be anions. This class of compounds is made up of ternary pnictide oxides o…
The diffusion of protons in the superprotonic phases of CsHSO4, Cs3H(SeO4)2, Rb3H(SeO4)2 and Cs5H3(SO4)4-H2O have been studied by quasielastic neutron scattering on the IRIS spectrometer at the ISIS pulsed neutron spallation source. The data were analysed on the basis of the jump diffusion model via unfilled proton po…
We have examined the reaction of solution and vacuum vapor deposited long chain perfluorinated n-alkanoic acids CF3(CF2)nCOOH (n=8–16) with the native aluminum-oxide surface using x-ray photoelectron spectroscopy and infrared reflection absorption spectroscopy. Adsorption from solution results in slightly higher acid…
Abstract Surface properties of Kapton® were analysed after different exposures to ground state fast atomic oxygen (FAO) and vacuum ultraviolet radiation in the atomic oxygen beam facility at the University of Toronto Institute for Aerospace Studies. X‐ray photoelectron spectroscopy, scanning electron microscopy and co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpecific immobilization of electropolymerized polypyrrole thin films onto interdigitated microsensor electrode arraysA. Guiseppi-Elie, A. M. Wilson, J. M. Tour, T. W. Brockmann, P. Zhang, and D. L. AllaraCite this: Langmuir 1995, 11, 5, 1768–1776Publication Date (Print):May…
Abstract A comprehensive kinetic model developed for molecular weight calculations of ethylene axsnd α‐olefin copolymerizations in the context of a terminal model accounts for multiple‐type active centers of the catalyst, detailed elementary chemical reactions, and catalyst composition. The moments of copolymer chain…
As a contribution to the development of methods for the design and the analysis of devices based on giant magnetostrictive materials, a model for the simulation of the dynamic behaviour of the nonlinear magnetoelastic medium is presented. The coupled magnetic, magnetoelastic and mechanical equations that describe the…
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We study the density of states, the distribution of energy spacings, and the transmission coefficient of one-dimensional quasiperiodic Fibonacci and Thue-Morse systems. We consider arrays of \ensuremath{\delta} potentials with constant separation and two potential strengths, and tight-binding systems with constant nea…
Abstract Thermotropic liquid‐crystalline copolyesters made from vanillic acid (V), 4‐hydroxybenzoic acid (B) and poly(ethylene terephthalate) (E) were examined by 1 H‐NMR and GPC investigations. Nine possible diads could be identified and assigned. The sequence distribution of V/B/E copolyesters tends to change from r…
This paper presents a new expression of the two dimensional magnetic properties using the effective anisotropic field. We give a definition of the effective anisotropic field under alternating flux condition and apply it to measured results. The method allows one to obtain a simple model even for grain-oriented steel.…