A Chemical Method for the Deposition of Nickel Oxide Thin Films
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Role of Interfacial Friction and Lubrication in Yarn and Fabric Mechanics
We describe an experimental study of the effects of various surface treatments on the frictional and tensile properties of cotton and aramid single yams and also on the mechanical properties of fabrics woven from these yams. Lubrication of the yarn or fabric generally reduces those parameters that quantitatively descr…
Direct and Indirect Dissolution of Sapphire in Calcia–Magnesia–Alumina–Silica Melts: Dissolution Kinetics
The dissolution rate of sapphire into CaO‐MgO‐Al 2 O 3 ‐SiO 2 (CMAS) melts was investigated at 1450° and 1550°C. The effects of immersion time, specimen rotation rate, and magnesia concentration in the bulk melt on the sapphire dissolution rate and on the growth rate of magnesium aluminate spinel at the sapphire/melt…
Melt Strength Behavior of PE and its Relation to Bubble Stability in Film Blowing**
Abstract Melt strength data are presented on the three major classes of commercial polyethylenes (LDPE, LLDPE and HDPE). The LDPE samples studied were polymerised by both tubular and autoclave reactor technology and the LLDPE samples were produced with different α-olefins as comonomer. Melt strength was assessed from…
Nature and origin of an aluminous vermiculitic weathering product in acid soils from upland catchments in Scotland
Abstract Vermiculitization of mica is one of the main weathering processes in soils from three upland catchments receiving various levels of acid deposition. Usually this process is manifested by the presence of interstratified mica-vermiculite with the interlayer space in the vermiculite often partially filled with p…
The effect of ionizing radiation on sol-gel ferroelectric PZT capacitors
Ferroelectric (FE) thin-film capacitors are irradiated to 100 Mrad(Si) with 10-keV X-rays. Some of the FE hysteresis loops show distortion at 5 Mrad(Si). The type and degree of distortion are dependent on the polarization state and/or the applied field during irradiation. Preliminary results indicate that a fraction o…
Raman Microprobe Spectroscopy of Uranium Dioxide Single Crystals and Ion Implanted Polycrystals
Polarized Raman spectra of uranium dioxide single crystals were recorded with the use of a Raman microprobe. Results showed a peak at 448 cm −1 , having only off-diagonal tensor elements, which was assigned to the T 2 g zone center phonon. There was also a broad peak at 1156 cm −1 , which was ascribed to electronic Ra…
Oriented polymer networks obtained by photopolymerization of liquid‐crystalline monomers
Abstract In this paper a new class of oriented polymers is introduced: highly crosslinked polymer networks obtained by photopolymerization of oriented liquid crystalline (LC) monomers. Orientation of these monomers can be induced in the same manner as usual for conventional LCs applied in LCDs: with the aid of an elec…
The "anomalous" basicity of P(NHCH2CH2)3N relative to P(NMeCH2CH2)3N and p(NBzCH2CH2)3N: a chemical consequence of orbital charge balance?
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe "anomalous" basicity of P(NHCH2CH2)3N relative to P(NMeCH2CH2)3N and p(NBzCH2CH2)3N: a chemical consequence of orbital charge balance?M. A. H. Laramay and John G. VerkadeCite this: J. Am. Chem. Soc. 1990, 112, 25, 9421–9422Publication Date (Print):December 1, 1990Publica…
Total-dose radiation-induced degradation of thin film ferroelectric capacitors
The radiation hardness of thin-film PbZr/sub y/Ti/sub 1-y/O/sub 3/ (PZT) ferroelectric capacitors is explored. Ferroelectric capacitors were irradiated using X-ray and Co-60 sources to dose levels up to 16 Mrad(Si). The capacitors were characterized for their memory properties both before and after irradiation. The ra…
Profile agreement indices in Rietveld and pattern-fitting analysis
Two definitions of profile agreement indices are now in common use for estimating the degree of fit in Rietveld refinement and in structure-independent pattern-fitting methods of powder diffraction analysis. In the original program written by Rietveld, the background was subtracted and the `non-peak' regions of the pa…
The nitrogen content of type Ib synthetic diamond
The concentration of single nitrogen atoms in type Ib synthetic diamond has been measured, by electron paramagnetic resonance and by inert-gas fusion, as a function of the strength of the infrared absorption produced by these centres. The two methods yield, in good agreement, values of 22·0 ±.1·1 at. p.p.m. and 20·6±1…
Generalized random sequential adsorption
Adsorption of hard spherical particles onto a flat uniform surface is analyzed by using generalized random sequential adsorption (RSA) models. These models are defined by releasing the condition of immobility present in the usual RSA rules to allow for desorption or surface diffusion. Contrary to the simple RSA case,…
Ferroelectronic ram memory family for critical data storage
Ferroelectric materials show a spontaneous electrical polarization that can be reversed in sense by an applied external electric field. It should, therefore, be feasible to build a ferroelectric memory device that can store information in digital form. Early attempts to build such a memory have failed for various reas…
A Competitive Adsorption Model for the Inhibition of Crevice Corrosion and Pitting
Similarities in the inhibition of crevice corrosion and pitting can be explained on the basis of competitive adsorption between inhibitive and aggressive ions. A mathematical model has been developed which takes into account competitive adsorption between aggressive ions (Cl − ) and inhibitive ions , with each ion ads…
Polarized Single-Crystal Fourier-Transform Infrared Microscopy of Ouray Dickite and Keokuk Kaolinite
Abstract Single-crystal Fourier-transform infrared (FTIR) spectra of Keokuk kaolinite and Ouray dickite were obtained with an FTIR microscope. Although numerous IR, FTIR, and Raman spectra of polycrystalline kaolinite and dickite can be found in the literature, the present data represent the first reported single-crys…
Spectral splitting and wave-function scaling in quasicrystalline and hierarchical structures
We give a comprehensive presentation of a renormalization-group theory for the study of a set of one-dimensional Schr\"odinger equations on quasicrystalline and hierarchical structures. Particular attention is focused on the spectral clustering and wave-function scaling properties. New results are given on (i) a gener…
A barometer of crystallization rates of polymeric materials
Abstract A crystallization rate coefficient (CRC) parameter is introduced which has allowed a direct comparison of the crystallization rates of various polymers on a single scale for the first time. Basically, CRC represents a change in cooling rate required to bring about 1°C change in the supercooling of the polymer…
Nuclear quadrupole interactions in copper(II)-diethylenetriamine-substituted imidazole complexes and in copper(II) proteins
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear quadrupole interactions in copper(II)-diethylenetriamine-substituted imidazole complexes and in copper(II) proteinsFeng Jiang, John McCracken, and Jack PeisachCite this: J. Am. Chem. Soc. 1990, 112, 25, 9035–9044Publication Date (Print):December 1, 1990Publication Hi…
Aqueous colloidal dispersions of polyaniline formed by using poly(vinylpyridine)-based steric stabilizers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAqueous colloidal dispersions of polyaniline formed by using poly(vinylpyridine)-based steric stabilizersS. P. Armes, M. Aldissi, S. Agnew, and S. GottesfeldCite this: Langmuir 1990, 6, 12, 1745–1749Publication Date (Print):December 1, 1990Publication History Published onlin…