Materials Literature
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A surface having a spatial gradient in its surface free energy was capable of causing drops of water placed on it to move uphill. This motion was the result of an imbalance in the forces due to surface tension acting on the liquid-solid contact line on the two opposite sides ("uphill" or "downhill") of the drop. The r…
The crystal structures and site-populations of 12 richterites have been refined to R indices of 1-2% using single-crystal MoKα X-ray diffraction data. Potassium-fluor-richterites from lamproites are characterized by [4] (Si+Al) sums less than 8.0 apfu (atoms per formula unit), suggesting the presence of other isomorph…
Zinc ferrite (ZnFe 2 O 4 ) has the cubic spinel structure with an (approximately) normal cation distribution. It was synthesised by direct reaction of the oxides at 800 ° C, and also by using a sodium tungstate flux with excess ZnO. Lattice parameters (a o ) of samples from both syntheses were emasured at room tempera…
The role of the attractive force in self-diffusion of atoms in a Lennard-Jones fluid is explored through molecular dynamics simulation. Expressions for the self-diffusion coefficient in terms of the memory function and the random force autocorrelation function are used to develop simple approximations which separate t…
Separable binary-phase array illuminators for fan-out up to 1024 x 1024 and ~65% two-dimensional efficiency are designed by simulated annealing with constraints for maximizing the minimum feature size. A new nonseparable trapezoidal coding technique is introduced and applied to design high-efficiency (~75%-80%) array…
Natural gas has considerable potential as an alternative automotive fuel. Methane, the principal hydrocarbon species in natural-gas engine exhaust, has extremely low photochemical reactivity but is a powerful greenhouse gas. Therefore, exhaust emissions of unburned methane from natural-gas vehicles are of particular c…
The crystal structure of iodine has been investigated using high resolution neutron time-of-flight powder diffraction in the temperature range 5 to 150 K. The results confirm the structure is orthorhombic, space group Cmca, and is isomorphous with the solid halogens bromine and chlorine. The accurate structural parame…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Amorphous Se 1-x Sb x alloys were prepared using a conventional rapid quenching technique. It is found that antimony can only be substituted up to approximately 10 at.% in selenium to produce Se-Sb glassy alloys. The photoacoustic technique is employed for the first time to determine the optical energy gaps of Se 1-x…
We report the observation of a very large piezoresistive effect in both polycrystalline and homoepitaxial chemical-vapor-deposited diamond films. The gauge factor for polycrystalline p-type diamond at 500 microstrains was found to be only 6 at room ambient, but increased rapidly with temperature, exceeding that of pol…
Abstract We consider a gradient flow for the functional FЄ(u) = ∫Ω 1/Є W(u) + Є | with a view towards modelling the interfacial motion associated with domain coarsening in binary alloys in the presence of boundary contact energy. Here If is a non-negative ‘double-well’ free energy density and u is the composition dens…
Abstract A systematic analysis of those liquid binary 2:1 systems (denoted MX2), for which experimental partial structure factors are available from the isotopic substitution method in neutron diffraction, is made using the Bhatia-Thornton (BT) formalism.Particular attention is paid to the origin of the first sharp di…
Second-order optical nonlinearity χ(2) is induced in glass films by corona poling. The glass films are fabricated by radio-frequency sputtering Corning7059 onto Pyrex glass substrates. The values of second-order nonlinear coefficient d33 of the corona-poled glass films are estimated to be ∼0.5 pm/V. Using the corona-p…
We describe molecular dynamics simulations of fluid films confined between two solid walls. The films consist of spherical molecules, or flexible linear chains with up to twenty monomers. When the wall separation is only a few molecular diameters, crystalline or glassy order is induced across the film. The onset of th…
A formula for the energy corresponding to a potential phi obeying (- Del 2 + kappa 2 ) phi =0 is derived as an expansion in kappa -1 for manifolds with arbitrary smooth boundaries and either Neumann or Dirichlet boundary conditions. The first three terms in the expansion are explicitly determined and they agree with r…
Formation of a hi8hly corrQsion-protective and persistent film on iron with bismuth () chloride in acid solutions has been reporte(1 in Qur previous paper In order to investigate the inhibitiQn mechanism of metall ic corrosion wi th b i smuth (H compounds in ac id solut ions inhibi t ion eff ic i encies of the compoun…
Abstract Epoxy‐terminated poly(aryl ether sulfone)s (PSE) were prepared by the reaction of epichlorohydrin with hydroxyethyl‐terminated polysulfones, which were synthesized from chloro‐terminated polysulfones (PSC) and diethanolamine. Both PSE and PSC were used as modifiers for toughening of bisphenol A diglycidyl eth…
Abstract Atomic oxygen chemisorption has been studied for the fourfold hollow site of the Ni(100) surface and for the threefold hollow site of the Ni(111) surface. To model the Ni(100) surface, 10 different clusters in the range Ni 5 to Ni 41 were used, and for the Ni(111) surface, 11 different clusters in the range N…
Electrically conducting latexes of polypyrrole coated on inorganic cores were obtained by deposition of pyrrole on catalytically active particles. The finely dispersed core materials were hematite (polyhedral and spindle-type), silica coated with hematite, magnetite, and cerium(IV) oxide. The degree of polymer coverag…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…