Materials Literature
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The structural similarity between Cdx(CN)y and SixOy in the AxBy composition, A taking tetrahedral positions linked successively with B to build up multi-dimensional structures such as 1D-chains, 2D-layers, or 3D-lattices, can be utilized in developing mineral-like but unprecedented inclusion or supramolecular structu…
Abstract Two carbamoyl‐type activators of ε‐caprolactam (CL) anionic polymerization have been used in quasi ‐adiabatic conditions with sodium caprolactamate as initiator, at different concentrations and relative ratios. The reaction products have been characterized in terms of high‐polymer content and extent of crossl…
The dispersion of the spin waves in EuS has been investigated by means of neutron scattering. In zero field and at small momentum transfer q, the energy \ensuremath{\Elzxh}${\mathrm{\ensuremath{\omega}}}_{\mathit{q}}$ of the spin waves is proportional to q in agreement with the predictions of spin-wave theory that inc…
Abstract The atomic structure of the (10 1 2) twin boundary in zinc is investigated theoretically by atomistic calculations and experimentally by high resolution electron microscopy. For computer simulations, the atomic interactions are described by a many‐body potential of the Finnis‐Sinclair type and are applied to…
Single crystals of Ce 2 (WO 4 ) 3 have been prepared by crystallisation from molten mixtures of WO 3 and CeO 2 . The compound shows monoclinic symmetry, a = 7.813(4), b = 11.720(2), c = 11.586(3), β = 109.36(3)°, Z = 4, and is isotypic to Eu 2 (WO 4 ) 3 , but shows large differences of the atomic coordinates especiall…
Abstract Isothermal melt crystallization kinetics were investigated by differential scanning calorimetry (DSC) for virgin and α‐chloronaphthalene solvent‐treated poly(phenylene sulfide) (PPS) systems. The overall crystallization rates were found to be much faster for the solvent‐treated PPS than for the virgin neat PP…
In this paper, we describe a unique low frequency underwater sound source called the combustive sound source (CSS). In this device, a combustible gas mixture is captured in a combustion chamber and ignited with a spark. The ensuing combustion produces expanding gases which in turn produce high intensity, low frequency…
We have carried out Brownian dynamics simulations of binary mixtures of charged colloidal suspensions of two different diameter particles with varying volume fractions \ensuremath{\varphi} and charged impurity concentrations ${\mathit{n}}_{\mathit{i}}$. For a given \ensuremath{\varphi}, the effective temperature is lo…
Abstract Composites of elastomers and cellulose have been investigated. Copolymers of styrene‐butadiene rubber (SBR) and acrylonitrile‐butadiene rubber (NBR) as well as natural rubber (NR) were compounded with regenerated cellulose (Cellulose II). The technique for the incorporation of filler was based on the coprecip…
We describe the sensitivity of sub-micron via integrity to high-temperature processing following via etch. It has been observed that thermal expansion of Al into the via hole, before tungsten deposition, may result in the fabrication of a deformed tungsten plug. Our results indicate that relaxation of the Al can give…
The effect on β‐C 2 S of two stabilizing agents, calcium sulfate and alumina, has been investigated using high‐resolution 29 Si solid state NMR spectroscopy. Syntheses were achieved via the gel route, wet or dry processes. Room‐temperature NMR spectra characteristics were analyzed as a function of the sintering temper…
The thermodynamic stabilities of various barrier materials and the self-healing of aluminide coatings in oxygen saturated Pb-17Li have been evaluated. Binary nitrides and carbides are stable, but binary oxides display diverse behaviour; Al2O3 and MgO are stable, Cr2O3 is unstable to reduction to chromium metal and SiO…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of Intermolecular Hydrogen Bonding in Some Supramolecules: An AM1 Study of the Binding Energies and HyperpolarizabilitiesJ. A. R. P. Sarma, J. Laxmikanth Rao, and K. BhanuprakashCite this: Chem. Mater. 1995, 7, 10, 1843–1848Publication Date (Print):October 1, 1995Public…
There have been a number of recent investigations of diffusing particles in the presence of traps. Among many applications of this process, we find phenomena such as reaction rates, biological models, and dielectric relaxation. In this paper we present a theory for the absorption probability density for a walker in th…
Abstract The structure analyses of the quartz-type form of GaPO 4 crystals were carried out by using X-ray diffraction intensities at six points of temperatures from 293 K to 747 K. Temperature dependence of the thermal and positional parameters of atoms was examined by applying the conventional harmonic structure-fac…
Abstract The form under which Ti occurs in kaolinitic materials from various environments has been investigated using second derivative diffuse reflectance spectroscopy. The position of the absorption edge may be used as a diagnostic band to determine Ti-phases (anatase, rutile, Ti-gels). Ti-oxides may be detected in…
We have used perturbed-angular-correlation (PAC) spectroscopy to measure static and fluctuating electric-field gradients (EFG's) at the M sites in the pyrochlore ceramic materials, ${\mathit{R}}_{2}$${\mathit{M}}_{2}$${\mathrm{O}}_{7}$ (R=Nd, Sm, Eu, and Gd; M=Zr and Hf). Samples were doped with a small concentration…
Abstract Redox potentials of nonplanar metallododecaphenylporphyrins (MDPP) are determined by cyclic voltammetry. Oxidation processes of MDPP are selectively shifted to negative potentials in comparison with those of planar metalloporphyrins.
PURPOSE: To produce biodurable small diameter microporous vascular grafts with self-sealing properties for vascular access, for peripheral vascular and potentially for coronary artery bypass. The prosthesis should retain compliance and pulsatile flow in situ using a unique modus operandi permitting wall compression wh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstitution chemistry of gallium for titanium in nonlinear optical KTiOPO4: syntheses and single-crystal structures of KGaF1-.delta.(OH).delta.PO4 (.delta. .apprxeq. 0.3) and KGa0.5Ge0.5(F,OH)0.5PO4William T. A. Harrison, Mark L. F. Phillips, and Galen D. StuckyCite this: C…