Materials Literature
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Abstract Triple-decker sandwich complexes, which consist of two cerium ions and three strip-like diarylporphyrins, have been synthesized and their spectroscopic and electrochemical properties and mesomorphism are reported and compared with those of the corresponding double deckers and the parent monomers. The Soret ba…
Acinetobacter baumannii BL54, a silver (Ag) resistant micro-organism was isolated from clinical samples collected at the Armed Forces Medical College hospital in Pune, India. The strain BL54 removed a high quantity of silver (2.85 mg/g biomass) from photographic wastewater effluent. Treatment of the cells with 10 mM E…
Abstract Adsorption and the mechanism of adsorption of the herbicide glyphosate [N-(phosphonomethyl) glycine] by hydrotalcite (HT) and by hydrotalcite calcined at 500°C (HT500) was studied. The values of the Freundlich K constant of the adsorption isotherms and the distribution coefficients, Kd, depend on the pH of th…
The thermal expansion of the orthorhombic \ensuremath{\gamma} phase of ${\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ has been measured using neutron powder diffraction from 4.6 to 410 K, where it transforms to the cubic \ensuremath{\alpha} phase. At low temperature, $\ensuremath{\gamma}{\ensuremath{-}\mathrm{Z}\mathrm{r}\mathr…
We give a detailed analysis of the scanning electron microscope mirror method for studying a cloud of charge stored near the surface of an insulator, paying particular attention to the approximations that are often made. We discuss the effect of the finite size of the experimental chamber, of the thickness of the samp…
The application of peptide recognition sequences of elastase to fibers of wound dressings is a possible route to inhibiting high levels of destructive elastase in the chronic wound. For this reason we have synthesized the elastase recognition sequence Val-Pro-Val on both cotton cellulose, and carboxymethylated cellulo…
Abstract On‐line measurement of birefringence was performed in the high‐speed melt spinning process of poly(ethylene terephthalate) using an apparatus that incorporates a rotating polarizer for the measurement of the optical retardation of running filament. Particular attention was paid to the detailed measurements in…
The effect of a powder bed on the densification behavior of a compact made from a silicon carbide powder and containing yttria and alumina additives has been studied. It has been found that where the powder bed is made of just silicon carbide grit, relative densities of up to 0.92 of the theoretical density can be obt…
The effects of NH 4 + assimilation on dark carbon fixation and β‐1,3‐glucan metabolism in the N‐limited marine diatom Skeletonema costatum (Grev.) Cleve (Bacillariophyceae) were investigated by chemical analysis of cell components and incorporation of 14 C‐bicarbonate. The diatom was grown in pH‐regulated batch cultur…
This article reports on a new phenomenon: The presence of a compatibilizer accelerates the melting/plastification of an immiscible polymer blend during melt blending. The increase in the rate of melting as a result of the addition of a compatibilizer is believed to be one of the important factors responsible for the f…
We describe the investigation of epitaxial SrTiO 3 /BaTiO 3 strained superlattice films prepared by an atomic-layer metalorganic chemical vapor deposition (ALMOCVD) method. Transmission electron microscopy (TEM) observation shows that the multilayered structure is globally uniform and that the interfaces formed betwee…
Pt(O) films having compositions ranging from pure Pt to amorphous platinum oxide a-PtOx (x∼1.4) were prepared by reactive sputtering and examined during and after heating to temperatures used for deposition and processing of high-epsilon (HE) and ferroelectric (FE) materials (400–650 °C). A two stage decomposition pro…
Small amplitude oscillations of gas bubbles in sonicated liquids are quasi-reversible events, but the sudden collapse of widely expanded bubbles results in extensive vapor supersaturation. However, Hilgenfeldt et al. ( Nature 1999, 398, 402) explain single-bubble sonoluminescence by assuming that collapsing bubbles re…
We have demonstrated reversible change in transmittance of composite films, which are composed of an isotropic (I) polymer matrix and a host nematic (N) liquid crystal (LC) containing donor–acceptor type azobenzene LCs (AzoLCs) as photoresponsive molecules, by means of reversible phase transition in the LC domain. The…
The influence of acrylonitrile during the grafting process of styrene onto pre-irradiated films of poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) and poly(tetrafluorothylene-alt-ethylene) (ETFE) was studied. The composition of the graft polymers was analysed with elementary analyses. A correlation between the…
The cytoplasmic protein-tyrosine kinase Fes has been implicated in cytokine signal transduction, hematopoiesis, and embryonic development. Previous work from our laboratory has shown that active Fes exists as a large oligomeric complex in vitro. However, when Fes is expressed in mammalian cells, its kinase activity is…
New experimental study of heavy ion and proton induced SEU at reduced voltage (i.e. reduced critical charge) reveals interesting results. It is shown that the heavy ion cross section and microprobe mapping scale like the threshold LET and the parameter, which is almost invariant under bias changes, is the effective ch…
The structure of tetrahedral amorphous carbon (ta-C) films deposited by a filtered cathodic vacuum arc has been studied using micro-Raman spectroscopy in terms of substrate bias, nitrogen gas partial pressure (ta-C:N films) or aluminum content in a mixed aluminum/carbon target (ta-C:Al films) during deposition. The fi…
Oxide/oxide microcomposites were fabricated and tested to evaluate the effectiveness of monazite (LaPO 4 ) and hibonite (CaAl 12 O 19 ) as interlayers in sapphire‐reinforced Al 2 O 3 ‐matrix composites. For interlayer thicknesses of 0.3‐0.5 µm, both interlayers showed evidence of crack deflection; however, debond leng…
Polymer layered silicate nanocomposites may be formed by annealing layered silicate particles with a polymer melt. Polymer molecules leave the bulk melt and intercalate between the silicate layers, producing a structure in which polymers are confined on the nanometer scale by the silicate layers. We report here molecu…