Materials Literature
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L’hétéropolytungstate [(H 3 Sb III W 17 O 59 )U IV (HW 5 O 18 )] 11– a été préparé à partir de tungstate de sodium et, soit de fluorure, soit de chlorure d’uranium(IV). L’étude cristallographique montre que l’atome central d’uranium(IV) est au centre d’un antiprisme d’Archimède. Il est coordonné par quatre atomes d’ox…
Novel selenium-containing π-conjugated compounds have been studied for the development of organic metals, superconductors, and field-effect-transistors. Methylenedithiotetraselenafulvalene (MDT-TSF) and its related electron donors are effectively synthesized by the recently developed synthetic method consisting of the…
Synchrotron x-ray diffraction studies of a ${\mathrm{Sn}}_{2}{\mathrm{P}}_{2}{\mathrm{S}}_{6}$ crystal near the continuous ferroelectric phase transition have revealed that the critical scattering contains two independent components. The extraneous narrow component appears to originate from the strained, near-surface…
Abstract The structural and physical properties of polyamide 66 (PA66)/syndiotactic polystyrene (sPS) blends were studied with electron microscopy, wide‐angle X‐ray scattering (WAXS), differential scanning calorimetry (DSC), dynamic mechanical thermal analysis, and tensile creep, stress–strain, and impact measurements…
Abstract Immiscible polymer systems are known to form various kinds of phase‐separated structures capable of producing self‐assembled patterns at the surface. In this study, different surface characterization methods were utilized to study the surface morphology and composition produced after annealing thin polymer fi…
Abstract The use of higher‐functionality oligomers of glutaraldehyde on network formation was investigated and compared with glutaraldehyde monomer in step‐growth reactions. The effect of using such oligomers in network formation depends on the stoichiometry, which alters either the branching or both the branching and…
Quantum Dots are unique for two very important reasons both of which can potentially be commercially exploited: •The electronic and optical properties of Quantum Dots are dependent on the particle size.•As the Quantum Dot nanoparticle becomes smaller the ratio of the number of surface atoms to those in the interior in…
Mesostructured chalcogenide-based materials with long-range order and semiconducting properties can be prepared using suitable molecular building blocks, linkage metal ions and surfactant molecules. In this paper we present surfactant templated, open framework platinum tin selenide and telluride materials assembled us…
Binary and ternary sulphide glasses, in contrast to their selenium counterparts, are usually not fully polymerized. This circumstance provides a means to examine the role of nanoscale phase separation effects on global elastic phase diagrams of disordered networks. In bulk Ge x As x S1 − 2 x glasses, the non-reversing…
Abstract Summary: A water‐soluble gold nanoparticle aggregate 2 was prepared by chloroauric acid and a polypseudorotaxane 1 of mono‐6‐thio‐ β ‐cyclodextrin with poly(propylene glycol) bis(2‐aminopropyl ether) ( $\overline M _{\rm w}$ ≈ 2 000) in the presence of sodium borohydride in N , N ‐dimethylformamide (DMF) solu…
Abstract Uniform and strongly adherent poly( o ‐toluidine) (POT) coatings have been synthesized on low carbon steel (LCS) substrates by electrochemical polymerization (ECP) of o‐toluidine under cyclic voltammetric conditions from an aqueous sodium tartrate solution. Cyclic voltammetry (CV), UV‐visible absorption spect…
Ordered mesoporous silica films were synthesized using pre-organized block copolymer templates in supercritical carbon dioxide. Poly(ethylene oxide- block -propylene oxide- block -ethylene oxide), PEO- b -PPO- b -PEO, films doped with p -toluenesulfonic acid (p-TSA) were infused with carbon dioxide solutions of silica…
Gold bead electrodes were modified with submonolayers of 3-mercaptopropionic acid or 2-aminoethanethiol and further reacted with poly(amidoamine) (PAMAM) dendrimers (generation 4.0 and 3.5, respectively) to obtain films on which Prussian Blue (PB) was later absorbed to afford mixed and stable electrocatalytic layers.…
: Butadiene-acrylonitrile rubber (NBR) was blended with ethylene- propylene-diene rubber (EPDM) in the presence and absence of different amounts of bromobutyl rubber (BIIR) to be tested as a compatibilizer. The results revealed that 10 phr was the optimum amount of BIIR to get a compatible blend. Dicumyl peroxide (DCP…
The ability of MP2, B3PW91 and PBE0 methods to produce reliable predictions in structural and spectroscopic properties of small selenium-halogen molecules and cations has been demonstrated by using 6-311G(d) and cc-pVTZ basis sets. Optimized structures and vibrational frequencies agree closely with the experimental in…
Abstract The solubility of ethylene in toluene and in toluene (90 wt %)/styrene–butadiene rubber (SBR; 10 wt %) solutions was determined because the solubility data were of interest for the kinetic study of the metallocene‐catalyzed homopolymerization of ethylene and the copolymerization of ethylene with α‐olefins. Th…
We present studies of magnetic circular dichroism in Cr $2p$ resonant photoemission of epitaxial $\mathrm{Cr}{\mathrm{O}}_{2}$ thin films. The results reveal that the occupied Cr $3d$ bands center at an energy of 1 eV below the Fermi level, and that photoemission spectral weight originating from Cr $3d$ is weak at the…
Abstract Summary: A novel ABC triblock copolymer with a rigid‐rod block was synthesized by atom transfer radical polymerization (ATRP). First, a poly(ethylene oxide) (PEO)‐Br macroinitiator was synthesized by esterification of PEO with 2‐bromoisobutyryl bromide, which was subsequently used in the preparation of a poly…
We have studied the optical and electrical properties of two bent-core substances with an azo linkage in their cores. Pump-probe laser studies, direct textural observations, and spectrophotometric recordings show an initial decrease of light transmission, which at larger light intensities (approximately 1 mW/mm2) is f…
Onconase (ONC), a member of the RNase A superfamily extracted from oocytes of Rana pipiens, is an effective cancer killer. It is currently used in treatment of various forms of cancer. ONC antitumor properties depend on its ribonucleolytic activity that is low in comparison with other members of the superfamily. The m…