Materials Literature
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Visible light emitting diodes are fabricated from p-type porous silicon (PoSi) thin films (∼200 nm) using indium tin oxide (ITO)/PoSi n-p heterojunction structures. Uniform PoSi thin layers were produced by pure chemical etching (stain etching) of B-doped single crystalline Si in a HF:HNO3-based solution. Electrolumin…
The surface morphology of porous silicon, produced by both chemical and electrochemical means, is studied by scanning force microscopy. Observed surface features in the macroscopic range (larger than 30 μm) include etch pits as well as rings and plateaus which are associated with hydrostatic forces during the etching…
The longitudinal and transverse structure functions are calculated for inclusive electron scattering from $^{12}\mathrm{C}$ and $^{40}\mathrm{Ca}$ in the quasielastic and dip region. The microscopic model presented here incorporates two-body currents derived from one-pion exchange and intermediate \ensuremath{\Delta}…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Novel Honeycomb-like Copper(II) Phosphate Framework, [BaCl][CuPO4]Kristen M. S. Etheredge and Shiou-Jyh HwuCite this: Inorg. Chem. 1995, 34, 11, 3123–3125Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 May 1995https://p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of Urea on Dioctadecyldimethylammonium MonolayersSilvia M. B. Souza, Hernan Chaimovich, and Mario J. PolitiCite this: Langmuir 1995, 11, 5, 1715–1719Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 May 1995https://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of Sonochemistry in Monitoring Chlorinated Hydrocarbons in WaterGrazyna E. Orzechowska, Edward J. Poziomek, Vernon F. Hodge, and William H. EngelmannCite this: Environ. Sci. Technol. 1995, 29, 5, 1373–1379Publication Date (Print):May 1, 1995Publication History Published…
Abstract UV irradiation of the Ag+/ZSM-5 catalyst prepared by an ion-exchange method in the presence of NO led to the photocatalytic decomposition of NO into N2, N2O and NO2 at temperatures as low as 298 K. Investigations of in-situ XANES, ESR, and DRS of the Ag+/ZSM-5 catalyst as well as the effective wavelengths of…
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…