Materials Literature
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The synthesis of 4,4′-bis(dialkylaminostyryl)-6,6′-dimethyl-2,2′-bipyridine ligands is described; the corresponding tetrahedral bis(bipyridyl) copper(I) complexes have been prepared, and their second-order nonlinear optical properties determined by harmonic light scattering (HLS) at 1.34 µm; these new octupolar comple…
Cotton and polyester fabrics are treated with radio-frequency plasma (in air) at different power levels and time intervals, and moisture content and surface resistivity behavior are investigated. Plasma treatment lowers the moisture content of cotton and enhances that of polyester. The surface resistivity of plasma tr…
Thin stainless steel films were prepared by sputter deposition onto silicon substrates using a 304 stainless steel target. The film composition was essentially that of 304 stainless steel, but they had a body‐centered cubic structure and were free of sulfide inclusions. Potentiodynamic polarization curves were obtaine…
Despite much debate, there is still little consensus of opinion on the dependence of Zener pinning (the stagnation of grain growth caused by second-phase particles) on the volume fraction. The controversy surrounds attempts to relate the volume fraction of particles to the final pinned grain size. Analytical theories…
This paper focuses on the features that set apart the electron probe microanalysis (EPMA) of highly radioactive material from standard EPMA. In addition, it describes the difficulties encountered in the analysis of irradiated nuclear fuel and explains how certain problems have been solved or at least overcome. The pap…
The synthesis of perovskite-type LaCrO3 under mild hydrothermal conditions is reported. The synthesized product was characterized by means of XRD, IR, SEM and elemental analysis. The results indicated that the phase corresponded to orthorhombic perovskite-type LaCrO3, and the product had a narrow particle size distrib…
The synthesis of CdS nanocrystals has been carried out from the thermolysis in a dynamic vacuum, between 150 and 300 °C, of the novel asymmetric cadmium dithiocarbamate [Cd{S2CNMe(C18H37)}2]; the particles ‘self cap’ during preparation; different size nanocrystals were synthesised, at different temperatures, and there…
Reaction of porphyrin-2,3-diones with aromatic aldehydes and NH4OAc in AcOH–CHCl3 affords 2-aryl-1H-imidazo[4,5-b]porphyrins which, with appropriate substitution, are useful building blocks for the synthesis of multi-porphyrin arrays; porphyrin-tetraones are similarly converted into the corresponding bis-fused systems.
Aluminium and gallium fluoroalkoxide complexes of formula M(OR f ) 3 (HNMe 2 ) [M=Al or Ga; R f =CH(CF 3 ) 2 , CMe 2 (CF 3 ) or CMe(CF 3 ) 2 ] were prepared by reacting the corresponding metal dimethylamide complexes with fluorinated alcohols. The dimethylamine adducts reacted with 4-dimethylaminopyridine to give M(OR…
We report the effect of varying the experimental conditions on the synthesis of colloidal HgTe nanocrystals in aqueous solution, and by using deuterated water (D2O) as a solvent, demonstrate strong luminescence over the full range of the strategic 1.3 and 1.5 µm telecoms windows.
The structure of orthorhombic hen egg-white lysozyme (HEWL) crystallized at 310 K has been refined at 1.7 A resolution. Large displacements of the side-chain atoms with respect to the tetragonal structure were observed in many places, in contrast to small displacements of the main-chain atoms. A chloride-ion binding s…
The destructive adsorption of CCl4 on La2O3 and CeO2 in the absence of any oxidant, such as oxygen, has been studied by X-ray photoelectron spectroscopy and insitu Raman spectroscopy as a function of the reaction temperature and the amount of CCl4 injected. La2O3 was much more reactive than CeO2, and CCl4 destruction…
The ability of CH3 groups to form helical chains of C–H‥π interactions with phenyl rings leads to polar stacking of trigonal octupolar networks in a substituted triazine, and therefore to three-dimensional non-centrosymmetry.
This paper is devoted to the study of resonant waveguide grating filters. It is shown that doubly periodic structures permit one to increase the angular tolerance of the filters without modifying the frequency linewidth. A theoretical study of such structures is presented and their response to an incident Gaussian bea…
A single chamber cell constructed from an yttria‐stabilized zirconia solid electrolyte with a nickel anode and a strontium‐doped lanthanum manganese oxide cathode can generate an electromotive force (emf) of and a power density of in a mixture of methane and air at a flow rate of and . The simultaneous additions of ga…
CdS (E=2.5 eV) nanoparticles were synthesized in reversed micelles and capped with materials of different band gaps and charge compensation ability: Cd(OH)2 (4.0 eV), ZnS (3.2 eV), and CdO (2.3 eV). The preparations allowed the examination and comparison of the efficiencies of confinement of the electron and hole by t…
The glnA gene in the domains Bacteria and Archaea encodes glutamine synthetase, a universally distributed enzyme that functions in ammonia assimilation and glutamine synthesis. We investigated the regulation and function of glnA in the methanogenic archaeon Methanococcus maripaludis. The deduced amino acid sequence of…
In contrast to normal conjugated oligomers, the stilbenoid squaraines 3a–d do not show a convergence of VIS/NIR absorption due to the extension of conjugation; the observed bathochromic effect in the beginning of the series is followed by a hypsochromic effect; this result seems to be characteristic for stilbenoid com…
An extremely fine active bending catheter devised for intravascular cerebral approaches is presented. A catheter with an outer diameter of /spl phi/1.5 mm and a total length of 1,500 mm has been developed. A shape memory alloy (SMA) wire is used as a bending actuator. In order to insert the catheter safely and rapidly…
Polymorphs of the charge transfer salt (bedt-ttf)4[(H3O)- CrIII(C2O4)3]·PhCN [bedt-ttf = bis(ethylenedithio)tetrathiafulvalene] which are either superconducting or semiconducting differ in the spatial distribution of Δ and Λ enantiomers of [Cr(C2O4)3]3– within the unit cell.