Materials Literature
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The X-ray crystal structure of a [2]catenane is reported; the two cycles which comprise the link are related by crystallographic symmetry, so only when a packing diagram is generated is the interlocked structure revealed.
Contact angle, electrokinetic, and X-ray photoelectron spectroscopic (XPS) measurements have been used to study the surface properties of flame- and oxygen plasma-pretreated polypropylene/ ethylenepropylene-diene monomer rubber (PP-EPDM) blends and of ethylene vinyl acetate (EVA) copolymers grafted with carboxyl group…
The rate of butane isomerization at low temperature is more than two orders of magnitude greater over sulfated zirconia with iron and manganese than over unpromoted sulfated zirconia. Therefore, the bulk and surface structures of the unpromoted and promoted catalysts have been investigated using X-ray absorption spect…
Diamond photoconducting detectors (PCDs) are one of the primary x-ray diagnostics for z-pinch experiments at Sandia National Laboratories’ Saturn facility. Diamond PCDs represent a significant advance in the state of the art for electrical x-ray detectors because of their stability of response, overall flatness of res…
Abstract Polymethacrylates with laterally attached azobenzenes were prepared to cause molecular reorientation of this chromophore in their thin films by linearly polarized irradiation with an exposure energy of less than ca. 100 mJ/cm 2 . A homogeneous alignment was induced by assembling a nematic liquid crystal cell…
Magnetohydrodynamic flows play an important role in the design of liquid-metal fusion reactor blankets. The interaction of the plasma-confining strong magnetic field and the electrically conducting coolant and breeding material may cause high pressure drop and unusual flow structures compared with hydrodynamic flows.…
Partial discharge (PD) patterns are an important tool for the diagnosis of HV insulation systems. Human experts can discover possible insulation defects in various representations of the PD data. One of the most widely used representations is phase-resolved PD (PRPD) patterns. We present a method for the automated rec…
Protein X-ray crystallography produces an electron density map that rarely detects individual hydrogen atoms or distinguishes between carbon, nitrogen and oxygen atoms in the electron density. This makes it difficult to orientate the side chains of Asn, Gln and His, which appear symmetrical in the electron density; th…
By observing the higher-order Bragg peaks corresponding to the layer spacing, the smectic-layer order parameters up to the third order were obtained and the center-of-mass distribution function along the layer normal was calculated. The results clearly indicate that the smectic layer distribution is different from a s…
Chitosan films, prepared from aqueous solutions of chitosan in 1 % v/v acetic acid, were subjected to heat treatment in an oven at known temperatures for specific durations. The effect of heat treatment on the water resistance of the films was measured by the extent of swelling and dissolution of the films in aqueous…
Homoleptic silver(I) complexes [Ag(L–L)2]BF4{L–L = RE(CH2)nER [R = Ph or Me, n= 2 or 3 (E = S or Se), n= 3 (E = Te)]} have been prepared and characterised by analysis, FAB mass spectrometry, and multinuclear NMR spectroscopy (1H, 77Se, 125Te and 109Ag). Variable-temperature NMR studies have been used to probe various…
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The novel molecular conductors, (DIETS)4M(CN)4(M = Ni, Pd, Pt) where reticulated donor-anion contacts are constructed using the strong and directional –-I ⋯ NC– interaction, are synthesized and characterized.
The stability of nematic structures within a cylindrical capillary whose wall exhibits a homeotropic boundary condition is studied. The structures are obtained numerically from Euler-Lagrange equations resulting from the minimization of the Frank free energy functional. Stability diagrams are presented showing depende…
In this paper we report about investigations on coupled electrochemomechanical phenomena in polypyrrole (PPy) free-standing films. Quantitative measurements of isotonic length and relaxed elastic modulus changes are performed on PPy samples during cyclic voltammetry and square-wave amperometry. The link between dimens…
The machinability of a heterogeneous silicon carbide with weak interphase boundaries, elongated grains, and high internal stresses is evaluated relative to a homogeneous control material with a well‐bonded, equiaxed, and unstressed grain structure. Drilling and grinding rates for the silicon carbide are substantially…
This work presents further results on the use of fractal features for recognition of 3-D partial discharge patterns. Two fractal features, the fractal dimension and lacunarity were calculated from 3-D discharge patterns and their power to discriminate among various discharge patterns was analyzed. The results indicate…
In this paper one-dimensional Cahn–Morral systems, which are the multicomponent analogues of the Cahn–Hilliard model for phase separation and coarsening in binary mixtures, are studied. In particular, there is an examination of solutions that start with initial data close to the preferred phases except at finitely man…
The synthesis of mesogenic triphenylene-based porphyrazine complexes bearing sixteen decyloxy side-chains is described; the widely extended core-system present leads to an enhanced stability of the mesophases formed by these complexes.
Abstract The common formalism of quantitative XPS can be easily modified, with two additional correction factors β eff and Q x , to account for the elastic scattering effects. These corrections, for a given solid, depend on photolectron line, the radiation used and the XPS configuration. The database compiled in the p…