Materials Literature
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Magnetization measurements, reported for ${\mathrm{Fe}}_{3\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ti}}_{\mathit{x}}$${\mathrm{O}}_{4}$ in the compositional range 0\ensuremath{\le}x0.04, were used to determine magnetocrystalline anisotropy constants as a function of x and temperature. Magnetic measurements were pe…
The dielectric response of a number of homogeneously aligned FLC cells has been investigated. Several relaxation processes exhibiting behaviour with different relaxation times are found for the first time. These are identified with the structure of the smectic layers in the cell and the parameters of the FLC mixtures.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDip in G''(.omega.) of Polymer Melts and Semidilute SolutionsRony GranekCite this: Langmuir 1994, 10, 5, 1627–1629Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 1994https://pubs.acs.org/doi/10.1021/la00017a051https:/…
This paper presents information on pedogenic processes, weathering status and geochemical evolution of ultramafic soils at three areas in southwestern British Columbia characterized by climatic conditions ranging from relatively wet–cool to relatively dry–cool. The soils of the Coquihalla serpentine belt have Podzolic…
A new magnetostrictive force sensor is presented and its operation is verified experimentally. The sensor has a single excitation coil and a single detection coil, which utilize the magnetostrictive effect. The cores of the coils function as ‘‘spring elements’’ of the sensor, and are linked together by rigid end plate…
A type of intrinsic luminescence in crystals has been revealed. The excitation threshold of well-known fast intrinsic luminescence of CsI (300 nm band) has been obtained from the excitation spectrum measured in the photon-energy range 5--125 eV at 300 K using synchrotron radiation. The excitation starts from an energy…
A sample preparation technique, suitable for x-ray-absorption measurements of liquid and supercooled metals is described. The method is based on an application of the emulsion technique, consisting in a dispersion of micrometric droplets in an inert rigid matrix. It has been applied to Hg and Ga resulting in a very fi…
Abstract Concentration‐dependent ternary interaction parameters are experimentally determined for the polyamide homopolymers, Nylon‐6, ‐66, ‐610, and for the Nylon‐66/610/6 terpolymer in formic acid‐water systems. The binodal envelope, the tie lines, and the crystallization isotherms at 25°C are given for each of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Structure, and Properties of Two New Vanadium(III) Phosphates: VPO4.cntdot.H2O and V1.23(PO4)(OH)0.69(H2O)0.31.cntdot.0.33H2OJ. T. Vaughey, William T. A. Harrison, Allan J. Jacobson, David P. Goshorn, and Jack W. JohnsonCite this: Inorg. Chem. 1994, 33, 11, 2481–2…
The interactions and orientational correlations of charged rodlike colloidal particles in a salt-free suspension are calculated using an ‘‘ab initio’’ approach which combines molecular dynamics for the rods and classical density functional theory for the counterions. Both fluid and liquid-crystalline phases are invest…
Vanadium pentoxide gels and sols, V2O5, nH2O, exhibit a ribbon-like structure. They form colloidal suspensions (also called Zocher phases or ‘tactophases’) which are clearly shown here to present a homogeneous lyotropic nematic phase for concentrations larger than ≈0·12mol 1−1. Classical threaded textures were observe…
Electron diffraction and high-resolution electron microscopic techniques are applied to reveal the mechanisms of crystallization of free standing 75-nm-thick thin films of ferroelectric lead-zirconate-titanate (PZT). Sol-gel methods, followed by pyrolysis at 350 °C, were used to provide a common starting point after w…
Abstract The reduction of CO2 with H2O was investigated on the single crystals of TiO2(100) and TiO2(110); the former TiO2(100) exhibiting a higher efficiency in the formation of CH4 and CH3OH than TiO2(110). Measurements of the intermediate species formed on the TiO2(100) single crystal were carried out using a high…
Decorticated kenaf stalks were retted by bacterial and chemical processes. Bacterial retting was done in troughs at a temperature of 30 ± 2°C. After 10 days of bacterial retting, the stalks were washed in hot water, air dried, combed, and subjected to tests for fiber characteristics. Chemical retting was done by boili…
We consider both the spatial domain and spectral domain forms of the Green's function, appropriate in the electromagnetic diffraction of a plane wave incident in the xy plane on a singly periodic structure, or grating, oriented along the x axis. For the spectral domain form, we exhibit for an obliquely incident plane…
Abstract Propylene oxide was anionically polymerised in bulk at 80°C under a range of initial conditions, from zero hydroxyl content to a mole ratio of hydroxyl to potassium catalyst of 10. The double bond content of the polymers was measured by 1 H NMR spectroscopy over a wide range of conversions, and values of the…
We present theoretical and experimental studies of the molecular second order nonlinear optical responses of donor–acceptor substituted conjugated compounds which consist of heteroaromatic moieties in place of the traditional benzenoid moieties. Electric-field-induced second harmonic generation measurement at a fundam…
New approaches to the interpretation of contrast-variation data from monodisperse systems using spherical harmonics are presented. A general method is given for evaluating the particle shape and internal structure and expressions for the scattering from the density fluctuations inside a particle with a known shape are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical Vapor Surface Modification of Porous Glass with Fluoroalkyl-Functional Silanes. 1. Characterization of the Molecular LayerHiroaki Tada and Hirotsugu NagayamaCite this: Langmuir 1994, 10, 5, 1472–1476Publication Date (Print):May 1, 1994Publication History Published o…
Fibrous monolithic ceramics were fabricated in the SiC/BN system. The microstructure consists of high‐aspect‐ratio polycrystalline cells of SiC separated by cell boundaries of BN. The fibrous monolith with aligned cells fails noncatastrophically in flexure, with delamination cracking along the BN cell boundaries. Inde…