Materials Literature
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Abstract Chlorination, bromination and iodination of bis(methylthio)tetrathiafulvalene (BMT-TTF) produced mainly the dihalogenated products (BMT-TTFX2) with small amounts of the monohalogenated derivatives (BMT-TTFX). The molecular structures of BMT-TTFBr2 and BMT-TTFBr2•I3 have been determined, and the conductivities…
The solid-state phase transformations and crystallography of equiatomic TaRu were examined by conventional and in-situ high-temperature transmission electron microscopy, with complementary experiments using X-ray diffraction and dilatometry. This alloy undergoes two displacive phase transformations on cooling from the…
Indium has replaced all of the Tl + ions in fully dehydrated fully Tl + -exchanged zeolite A by a solvent-free redox ion-exchange reaction with In metal at 623 K. The crystal structures of the zeolite before (Tl 12 Si 12 Al 12 O 48: a = 12.153(4) Å, R 1 = 0.054, and R 2 = 0.060) and after the reaction, followed by was…
The complete carbonylation mechanism for the model palladium(II) system, Pd(PH 3 )(CH 3 )(N-O) + CO → Pd(PH 3 )(COCH 3 )(N-O) (N-O = NHCHCOO - ), has been investigated employing nonlocal density functional theory (DFT) and second-order Møller−Plesset perturbation theory (MP2). Four possible mechanisms were identified,…
We used the electron-beam evaporation method in various oxygen partial pressure environments to deposit TiO(2) thin films on various glass substrates at 300 degrees C. We found the threshold oxygen partial pressures above which the film is transparent are different for films on various substrates. Below the threshold…
The effect of composition (phase), texture, microstructure and thickness on electrical properties of Pb(Zr 1- x Ti x )O 3 (PZT) films have been evaluated. Zr-rich PZT films with [111] texture have a higher remanent polarization and dielectric constant, but a lower coercive field as compared with PZT[100] films. Ti-ric…
The dissolution of calcite (CaCO 3 ) in the presence of aqueous solutions containing maleic acid ( cis -HOOC−CH CH−COOH) in the pH range 4.3−8.2 has been studied by means of atomic force microscopy utilizing a flow cell of known hydrodynamics and modelable convection/diffusion. The latter permits the interpretation of…
The development of the concept of chirality from the early work of Pasteur, van't Hoff and Le Bel to the work of Cahn, Ingold and Prelog is presented, and the constraints that chirality imposes on the symmetry of molecules - that chiral molecules may not possess an improper axis of rotation - is discussed. The relatio…
It is proposed that melt-extrusion of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) at varying processing temperatures and screw speeds causes changes in the atomic positioning of the oxygen atoms in the helix structure due to torsion of the main chain bonds. By wide angle X-ray scattering it was observed that an incre…
The local structures of amorphous Ge0.52Te0.48 and Pd0.01Ge0.17Sb0.26Te0.56 were examined by extended x-ray absorption fine structure. In amorphous GeTe film, only Ge atoms were observed in the nearest-neighbor of Te atoms. The average coordination number around Te atoms in amorphous GeTe is 1.5 which is close to twof…
Photoablation of polyimide (Dupont Kapton™) and poly(ethylene terephthalate) (PET) (Dupont Mylar™) were studied in vacuum using 248 nm, 16 ns excimer laser pulses. A sensitive electron beam ionizer/quadrupole mass spectrometer detector was used to measure mass, translational energy, and angular distributions of the ne…
Optically reflective composite polyimide films have been prepared by casting a dimethylacetamide solution of silver(I) acetate, hexafluoroacetylacetone, and the poly(amic acid) derived from 3,3‘,4,4‘-benzophenone tetracarboxylic acid dianhydride (BTDA) and 4,4‘-oxydianiline (4,4‘-ODA) onto an fully imidized parent BTD…
The following article is Part II of a three-part series on the use of polymer insulating materials in outdoor insulation applications. Despite three decades of service history, polymer insulation materials do not have the same level of standardization as porcelain. As with any technology that is not well standardized,…
Abstract The interactions between carbon layers and lithium atoms are described with a semiempirical molecular orbital method in order to clarify the Li storage mechanism in amorphous carbon (a-C) materials used in Li ion rechargeable batteries. The general electronic and geometric structures of Li-doped a-C materials…
Abstract The reactions of 2-phenylbenzothiazoline with [M(CH3COO)2]·4H2O (M = Co(II) and Ni(II)) afford the complexes [M(phbt)2 ] (phbt = 2-(phenylmethyleneamino)benzenethiolato) via a ring opening reaction of 2-phenylbenzothiazoline. Spectroscopic data indicate that the cobalt and nickel atoms occupy a tetrahedral an…
Abstract Octa‐ tert ‐butylphthalocyanina‐tonickel(II) ( 4 ) was synthesized from 3,5‐di‐ tert ‐butylphthalonitrile ( 1 ) and nickel acetate. A nonstatistical mixture of the four structural isomers 4a–d was obtained. The isolation of the structural isomers 4a–d by preparative HPLC (MPLC) allowed their unequivocal ident…
Summary: The starvation-stress response of Vibrio (Listonella) anguillarum was investigated and characterized with regard to changes in cell morphology and the ability of V. anguillarum to survive starvation, heat shock, exposure to H 2 O 2 and exposure to ethanol. The ability of V. anguillarum to survive exposal to t…
In order to improve our understanding of the link between the cyclic deformation of single crystals and of polycrystalline materials, a study was performed on copper bicrystals. Testing under strain control within the high cycle regime was performed in isoaxial [149] (90° and 180°) twist boundaries and [149]/[001] bic…
A structural analysis of the so-called smectic Q mesophase was performed on nine different chiral compounds. Not less than four different structures were observed, and they all belong to the crystal of defects class. The defects of the liquid crystalline organization are stacked in three dimensional crystalline lattic…
A systematic study of the promoting effect of various elements on crystallization and texture of tungsten sulfide (WS2) thin films is presented. Best crystallization at relatively low annealing temperatures Ta=650–750 °C is achieved by adding sodium sulfide or nickel to the film, while the strongest texture is achieve…