Materials Literature
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The three-dimensional paracrystalline lattice factors Z(q)'s for a face-centered-cubic lattice and a body-centered-cubic lattice, in addition to a simple-cubic lattice, were calculated. The Z(q)'s thus calculated could reproduce the diffraction peaks at the characteristic positions for each cubic lattice system over a…
This paper uses the theory of atoms in molecules to investigate the origin of molecular dipole moments. The dipole moment is given by a sum over the net charge and first moment of every atom in a molecule. The first term leads to a charge transfer contribution μc, the second to an atomic polarization contribution μa.…
At a triple wetting line, the liquid-fluid tension may produce a wetting ridge in sufficiently soft solids. By employing variational methods, it has been shown that the solid strain combined with the Laplace pressure may modify contact angle equilibrium on a mesoscopic scale, situated between that of the molecular str…
The effects of isotopic substitution of the dispersed nitrogen atoms in synthetic diamonds, on several defect centres resulting from radiation damage and annealing, are described. Measurements have been carried out with standard 14 N-containing diamonds and diamonds doped with 15 N. New features have been found in the…
The author's work on the adsorption of plasma proteins using radiolabeling, hydrodynamic thickness measurements and elution/identification methods is reviewed. This work was motiviated by the need to understand the role of protein adsorption in thrombus formation following blood-foreign surface contact. Studies of sin…
The distinctive peak shapes observed in diffraction studies of the icosahedral phases of Al-Mn, Al-Li-Cu, and related alloys are shown to arise from a specific configuration of quenched phason strains in a grain. This configuration is determined by considerations of symmetry and continuity of the phason field. Al-Mn a…
The ability of proteins to influence a wide variety of processes that occur at interfaces is well recognized. The biocompatibility of clinical implants, mammalian and bacterial cell adhesion to surfaces, initiation of blood coagulation, complement activation by surfaces, solid phase immunoassays, and protein binding t…
The elastic constants of the cubic perovskite KZnF 3 have been measured from 4 to 300 K. Heat capacity data, C p , and elastic constants have been analysed and compared with the predictions from the lattice dynamics within a rigid-ion model. Phonon dispersion curves at different temperatures, heat capacity and Debye t…
Abstract Crystal structures and electrical properties of radical‐cation salts of the chiral organic donor TMET ( S , S , S , S ,‐bis‐(dimethylethylenedithio)tetrathiafulvalene) are described. Two structural types, 2:1 with octahedral anions Pf , AsF , SbF , I (incommensurate), and 3:2 with tetrahedral anions BF − 4 ,…
Copolymers of azo dye substituted acrylic monomer and methylmethacrylate are synthesized and their third-order nonlinear optical susceptibility χ(3) is evaluated using the third harmonic generation Maker fringe method. The χ(3) is 1.26×10−12 esu at 25.9 mol % azo dye monomer content in the copolymer. It is also shown…
The predominance of nickel and vanadium porphyrins, over other metalloporphyrins in the geosphere may be explained by taking into account four factors: the abundances of the metals, and their environment within the sediments and/or the water column, the stability of the nitrogen-metal bonds, and the lability of the br…
Lamellar eutectics only grow in steady state over a small range of melt compositions between the two solidus lines of a binary phase diagram. Outside this range their growth exhibits a rich dynamical behavior. A random-walk model is constructed to simulate eutectic solidification of a thin film and applied to study th…
Polyurethanes have become the most valuable implantable elastomers for uses requiring toughness, durability, biocompatibility and biostability. They are inherently stable in the body environment. However, physical and chemical changes may be effected by conditions of processing, fabrication, use or interactions with o…
The response to electron bombardment of highly stressed Kapton-HTM, TeflonTM (polytetrafluoroethylene), and linear high-density polyethylene is investigated. Evidence is presented for electron induced crack initiation and crack growth. Calculations show that the electron exposures used in these experiments are suffici…
The effects of electron radiation and elevated temperature on the matrix dominated, cyclic response of standard T300/934 and a chemically modified T300/934 graphite-epoxy are characterzed. Both materials were subjected to 1.0 x 10 10 rads of 1.0 MeV electron ir radiation, under vacuum, to simulate 30 years in geosynch…
This paper deals with the irradiation effects on the thermal shock resistance Δ = σtk/Eα (σt : tensile strength, k: thermal conductivity, E: Young's modulus, α: thermal expansivity) and the thermal shock fracture toughness ∇=KIck/Eα (KIc : fracture toughness value of mode I) in addition to other mechanical properties…
It is shown that accurate x-ray photoemission spectroscopy values of the valence band offsets ΔEv for Ge/GaAs(110), GaAs/ZnSe(110), and Ge/ZnSe(110) vary linearly with the minimum band-gap difference and obey the simple scaling relation, ΔEv/ΔEg(min)=3/4. This empirical observation is compared with the predictions of…
Thermal conductivity, specific heat capacity and complex dielectric constant of PSN ceramic have been measured from 0.1 K up to 100 K. The thermal conductivity increases after poling of the sample but no influence of an applied electric field on the specific heat and the dielectric constant has been detected. Below 0.…
Abstract The behaviour of electrical conductivity of four ferrite semiconductor systems viz., Li‐Ni, Mn‐Mg, Co‐Zn and Ni‐Zn having different compositions has been studied in the vicinity of magnetic transformation temperature. Contrary to the predictions of an empirical formula (P ARKER 's) all the ferrites under inve…
Abstract A molecular theory for small‐angle neutron scattering from polymer mixtures is reviewed and extended to consider multiphase polymer systems such as block copolymers and their blends with homopolymers. Methods are developed for the isolation of scattering functions for individual components in these blends. Th…