Materials Literature
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Unprecedented eta 3 pi-donor behavior of the benzyltrimethy-lammonium ion is observed in the polymeric silver(I) complex [(PhCH2NMe3)Ag7(C2)(CF3CO2)6]n that comprises a columnar backbone constructed from the fusion of Ag8 square antiprisms each enclosing an acetylide dianion.
Zinc oxide (ZnO)‐based pastes with tailored rheological properties have been developed for direct‐write fabrication of thick‐film varistor elements in highly integrated, multifunctional electroceramic devices. Such pastes exhibited pseudoplastic behavior with a low shear apparent viscosity of roughly 1 × 10 4 Pa·s. Up…
The intergranular glassy film (IGF) composed of silicon oxynitride in a Si 3 N 4 ceramic material has been studied by molecular dynamics calculations. Structural analyses showed that the presence of an IGF having both nitrogen and oxygen reduces the number of dangling bonds at the junction between the IGF and adjacent…
Density functional calculations are reported on the addition of methane to Group 6 metallocenes, M(η-C5H5)2 (M), M(CH2(η-C5H4)2) (a-M) and M(η-C5Me5)2 (M*) where M = Mo and W. Full geometry optimisations were carried out on the singlet and triplet 16 electron complexes, 1[M] and 3[M], the η2-methane complexes, 1[M(η2-…
The electrochemical characterization of thin films of the ionically functionalized polyacetylene analogues poly(tetramethylammonium 2-cyclooctatetraenylethanesulfonate) (P(A)) and poly[(2-cyclooctatetraenylethyl)trimethylammonium trifluoromethanesulfonate] (P(C)) is reported along with an electrochemical approach to t…
Novel nanodimensional dyads were prepared by Bingel reaction of meso, meso-linked oligoporphyrin bis-malonates with C60. Distinct conformational effects were observed as a result of strong fullerene-porphyrin interactions, which also lead to efficient quenching of the porphyrin luminescence.
Experimental study of room temperature photoluminescence (PL) from silica nanoparticles and mesoporous silicas induced by ultraviolet and visible laser light (λEXC=266 and 532 nm or 4.66 and 2.33 eV, respectively) reveals several well-defined PL bands in the red- and near-infrared spectral range, which are peaked at 1…
Thin films of tungsten oxide were deposited on silicon substrates using reactive radio frequency sputtering. The structure of the films strongly depends on the conditions of deposition and post-treatment. Important issues are the influences of oxygen pressure during deposition and annealing temperature on the morpholo…
Mechanical alloying (MA) treatment was applied for the fabrication of fine-grained high nitrogen stainless steels. Chromium nitride (Cr2N) powder was mixed with Fe-Cr binary alloy powder to control its mean chemical composition to be Fe-23mass%Cr-1mass%N which is enough to stabilize austenitic structure at room temper…
Two new cyano complexes, K[Fe(bipy)(CN)4]·H2O (1) and (μ-bipym)[Mn(H2O)3{Fe(bipy)(CN)4}]2[Fe(bipy)(CN)4]2·12H2O (2), have been synthesised and their structures determined by single-crystal X-ray diffraction. Complex 1 is made up of mononuclear [Fe(bipy)(CN)4]− anions, potassium cations and water molecules of crystalli…
Amorphous silica–alumina catalysts were prepared in the sol–gel reaction of tetraethoxysilane in the presence of aluminium nitrate and various organic additives, and the effects of the additives on both pore formation and acid-site generation were investigated. Macropores with bicontinuous morphology are formed in the…
Abstract Measurement of optical rotation in RbTiOAsO 4 (RTA) with the tilter method resulted in an optical rotation of ρ 12 = +17(3) o /mm at a wavelength of 670nm, when a (100) sample was tilted about [001]. A tilt about [010] showed no rotation, as expected from the directional dependence of optical rotation calcula…
Poly(methyl silsesquioxane) (MSQ)–titania optical thin films were synthesized and characterized in this study. An MSQ precursor with a mixed cage and network structure was prepared first, which had end groups of Si–OH and Si–OCH3. Then, it was reacted with titanium(IV) n-butoxide, followed by spin-coating and multi-st…
To investigated the preferential complexing behavior of isomeric xylenes, syndiotactic polystyrene (sPS) membranes are prepared using varying compositions of p- and m-xylene. Complex formation between sPS and xylenes was studied by means of thermogravimetric and FT-IR analyses to determine the exact amounts of solvent…
A systematic study of the influence of the nature of organic electrolytes on the formation and morphology of the macropores obtained on various medium- and low-doped p-type silicon samples (15-0.015 Ω cm) during anodization is presented. Optimizing the HF/organic solution composition allows extension of the limit of m…
X-ray diffraction measurements on the Cr–H system were made using synchrotron radiation at high hydrogen pressures and high temperatures, and the phase diagram was determined up to p(H2)=5.5 GPa and T\\lesssim1400 K. Three solid phases were found to exist; a bcc phase (α) of low hydrogen concentrations, x=[H]⁄[Cr]\\le…
A series of meso-phenylpyridylporphyrins and their respective supermolecular species obtained by the coordination of [ Ru ( bipy ) 2 Cl ] + groups to the pyridyl substituents was synthesized and characterized. Their spectroscopic and electrochemical behavior were similar to that observed for the meso-tetra(4-pyridyl)p…
Crystallization from solution is an industrially important unit operation due to its ability to provide high purity separations. The control of the crystal size distribution can be critically important for efficient downstream operations such as filtration and drying, and product effectiveness (e.g., bioavailability,…
Highly branched stilbene dendrimers were synthesized and their photochemical behavior was studied. Even the stilbene dendrimer with molecular weight over 6500 underwent trans-cis isomerization in the excited singlet state within the lifetime of 10 ns. The photoisomerization of C=C double bond of stilbene dendrimers in…
The hemocompatibility of four different wettable polymer membranes, namely Cuprophan (CE), polyether-polycarbonate (PC-PE), polysulfone (PSU), and polyetherimide (PEI), was investigated with respect to fibrinogen (Fng) adsorption and platelet adhesion/activation. In order to estimate the polar and dispersion component…