Materials Literature
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Visible photoluminescence was observed in ultrafine Si particles at room temperature. Transmission electron microscopy revealed that Si microcrystallites were embedded in a Si oxide matrix for the sample which emitted the light. The emission energy depended on crystallite size in the range from 2.8 to 5 nm. The invers…
Abstract Various clay stabilizers are discussed, and methods are proposed for evaluating their effectiveness. Laboratory tests are used to rate the relative efficiency of potassium chloride vs other salts and organic compounds. Advantages and limitations of the various clay stabilizers are described. These studies sho…
Abstract The high strain rate response of polycarbonate (PC) and polymethyl methacrylate (PMMA) are measured using a split Hopkinson torsion bar for shear strain rates Ẏ from 500 s-1 to 2200 s-1, and temperatures in the range —100°C to 200°C. The yield and fracture behaviours are compared with previous data and existi…
The authors study finite-size corrections to the free energy in a two-dimensional random tiling model. This model is equivalent to an asymmetric six-vertex model and exhibits commensurate-incommensurate phase transitions of the Pokrovsky-Talapov type. They calculate finite-size scaling amplitudes of the free energy in…
Abstract Review: (discussion of the investigation methods (i.e.
Abstract The thermal degradation of samples of cotton, cotton oxidized by ceric ion, cotton grafted with vinyl acetate and methyl acrylate having different percent grafting yield, poly(vinyl acetate), and poly(methyl acrylate) has been investigated using the techniques of thermogravimetric analysis (TGA) and different…
Abstract The grafting of polyacrylamide on to guar gum in aqueous medium initiated by the potassium persulfate/ascorbic acid redox system has been studied gravimetrically at the temperature 35 ± 0.2°C in the presence of atmospheric oxygen and Ag + ions. The rate of grafting was found to increase with temperature, conc…
A perovskite-type oxideLaO5SrO5CoO3wa8prepared by ceramic coprecipitation and drip pyroysis methods The pellet-shaped oxide was fired at temperatures between900and13000C for O5tp100h The
The mean square displacement of a tagged particle in a liquid is known to exhibit a diffusive linear time dependence beyond a microscopic timescale. By making use of simple mode-coupling concepts the authors derive a set of analytic self-consistent equations for the relevant dynamical quantities in this regime, namely…
Pt/Co multilayers are an attractive candidate for a magneto-optical recording medium. However, films sputter deposited in Ar have coercivities too small (100–350 Oe) to be practical in recording. By sputter depositing multilayers in Kr or Xe instead of Ar, we achieved coercivities ∼1000 Oe, suitable for recording. We…
The authors measured the positron annihilation average lifetime in the sintered mullite-ZrO2 ceramic material at different ratios A/Z and including Cr2O3 and at three temperature values. The experimental results show that the positron lifetime can sensitively reflect the influence of different ratios A/Z and different…
The complex permittivity of a composite dielectric containing conducting inclusion is derived. The shape of the inclusions is described by their aspect ratio. The resultant equations describe the frequency dependence of the permittivity exactly, without recourse to empirically derived parameters.
We use a 9-carbon model compound to describe a proposed mechanism for homoepitaxial growth of diamond from methyl radicals on a hydrogenated, electrically neutral (100) surface. We estimate enthalpy and entropy changes for each step in the mechanism using group additivity methods, taking into account the types of bond…
The thermal properties of 4-cyanophenyl 4-(3,4-dialkoxybenzoyloxy)benzoates (1), 4-(3,4-dialkoxybenzoyloxy)phenyl 4-cyanobenzoates (2), 4-cyanophenyl 4-(2,4-dialkoxybenzoyloxy)benzoates (3) 4-(2,4-dialkoxybenzoyloxy)phenyl 4-cyanobenzoates (4), and some related compounds have been examined. Series 1 and 2 show a smect…
Scale Inhibitor Evaluations And A Mechanism Of Inhibition Of Sparingly Soluble Salts Mason B. Tomson; Mason B. Tomson Rice University Search for other works by this author on: This Site Google Scholar J. Matty; J. Matty Central Michigan University Search for other works by this author on: This Site Google Scholar J.E.…
The creep of a Pb–2·5Sb–0·2Sn alloy has been studied at stresses up to 6·5 MN m−2 in the temperature range 318–348 K (0·53–0·58Tm) using helical specimens. At 333 K, a transition in the stress exponent from ~1 to 3 occurred at ~3 MN m−2. The observed good agreements below the transition stress, both for experimental d…
Abstract cis-Dioxo (tetraphenylporphyrinato)molybdenum(VI) [MoVI(O)2(tpp)] (tpp=5,10,15,20-tetraphenylporphyrinato) is easily prepared by the pyrolysis of the corresponding diperoxoporphyrinato complex [MoVI(O2)2(tpp)] releasing dioxygen gas at 200 °C under 10−3–10−4 Torr (1 Torr≈133.3 Pa).
Evaporated gold films and gold films etched by argon ion bombardment to the same thickness are known to exhibit different optical and electrical properties. Transmission electron microscope observations presented in this paper confirm that these differences are caused by different growth/etch film morphologies. The de…
Abstract The luminescence spectra and radiative lifetimes of a series of d 3 and d 6 double complex compounds with bipyridine (bip), phenanthroline (phen), ammonia and ethylenediamine (en) ligands in the cations and chloride, cyanide, thiocyanide and oxalate (ox) ligands in the anions have been investigated at tempera…
Glycyl-l-alanine hydrobromide monohydrate and glycyl-l-alanine hydroiodide monohydrate (H2N-CH2-CO-NH-CH(CH3)-COOH·HX·H2O; (X=Br, l) are iso-structural and crystallize with the space group C2 2- P21, with two molecules in the unit cell. Therefore both compounds possess one polar axis parallel to the b-axis and they ar…