Materials Literature
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A green process, using a recyclable tungstate-exchanged Mg-Al layered double hydroxide (LDH-WO4(2-)) heterogenised catalyst and aqueous H2O2 oxidant in water, leads to N-oxidation of aliphatic tert-amines to amine N-oxides in quantitative yields, at a high rate at room temperature.
A new structural family of heteropolytungstate complexes containing trans-dioxo uranium(VI) (uranyl) groups has been isolated in good yield by reaction of UO22+ with [NaAs4W40O140]27− (W40) in aqueous solution. The “lacunary” anion, [(UO2)3(H2O)5As3W29O104]19−1 is formed by the reaction of W40 with UO2(MeCO2)2 at pH 7…
New perylene–porphyrin dyads have been designed that exhibit superior light-harvesting and energy-utilization activity compared with earlier generations of structurally related dyads. The new dyads consist of a perylene mono(imide) dye (PMI) connected to a porphyrin (Por) via an ethynylphenyl (ep) linker. The PMI–ep–P…
The [X − (X + N)] electron density distribution in a 3D ferromagnetic purely organic free radical, p-(methylthio)phenyl nitronyl nitroxide, is reported and analysed in terms of magnetic interactions. From the atomic charges obtained by multipolar refinement against the X-ray data, a charge transfer by intermolecular h…
To minimize compliance mismatch between native artery and arterial graft prosthesis over the entire pressure regions, we proposed a coaxial double tubular artificial graft which consists of an enhanced compliant inner tube and a less compliant outer tube, both of which were fabricated using well-controlled multiply mi…
The thermal conductivity of 10 mm thick low density polyethylene foam sheets cut from a block produced by a compression molding process has been studied in the temperature range between 24°C and 50°C. The cellular structure and the matrix polymer morphology have also been characterized to find out the main microscopic…
Chemical modification of Ar plasma-pretreated poly(tetrafluoroethylene) (PTFE) film by UV-induced graft copolymerization with glycidyl methacrylate (GMA), followed by reactive coupling of 3-aminopropyltriethoxysilane (APS), or reactive immobilization of polyaniline (PANI) chains had been carried out to improve the adh…
The stability of bassanite and the mechanism of dehydration of natural gypsum were investigated by in situ micro-Raman spectroscopy in the temperature range 300–380 K and 300–450 K. From the thermal evolution of the sulphate (940–1200 cm) and water (3250– 3750 cm) molecular stretching (ν1 and ν3) modes, it was evident…
Liquid dewetting, physical confinement, and attractive capillary forces have been combined to assemble monodispersed spherical colloids into complex, zigzag aggregates characterized by well-defined internal structures and tightly controlled lengths.
We report the effect of the concentration of hydroxide ion adsorbed on indium tin oxide (ITO) in the electrodeposition of zinc oxide (ZnO) by potential modulation method. We found that by applying an optimal constant potential of −0.72 V, X-ray diffraction (XRD) peak intensity of crystalline phase indicating ZnO (100)…
Comparative investigations between the new lyocell fibers and the regular viscose and modal types were made in order to explain the reasons for the differences in the mechanical properties of the fibers. The purpose was a systematic analysis of structure characteristics and of influence of aqueous medium on the mechan…
The ligands cyanate and di-2-pyridyl ketone (dpk) are used to construct a tetranuclear cobalt(II) complex involving μ1,1-cyanate bridges: [Co4(dpk-OH)2(dpk-OMe)2(NCO)4], which shows a dicubane-type structure, with two missing vertices, and having ferromagnetic interactions.
The application of a mixed conduction model and a new contact electric impedance (CEI) technique to predict quantitatively the electronic and ionic transport properties of oxide films on iron in a nearly neutral tetraborate solution is discussed. The mixed-conduction model emphasizes the coupling between the ionic def…
The effects of tempering temperature on wear resistance and surface roughness of a high speed steel (HSS) roll manufactured by centrifugal casting method were investigated in this study. Hot-rolling simulation test was carried out using a high-temperature wear tester capable of controlling speed, load, and temperature…
Ternary complexes of formula [Gd–DO3A–L–(H2O)] (where L is a carboxylate-containing ligand) display exchange lifetimes of the metal-coordinated water that can be modulated as a function of L.
Hollow mesoporous silica fibers have been synthesized under acidic conditions in a two-phase static system. The fibers always have a circular internal architecture with hexagonally arranged channels running perpendicularly around the fiber axis. The inner radius of the hollow fibers is variable and the fibers are conn…
Age determination of plutonium particles is a highly important task in view of the pending cut-off treaty for nuclear weapons materials. By collecting particles from the vicinity or inside the nuclear facilities and determining their ages, it is possible to monitor the observance of the cut-off agreement. In this stud…
Mechanisms of a variety of charge and lattice ordered phases observed in halogen-bridged binuclear metal complexes are theoretically studied by applying the exact diagonalization and strong-coupling expansion methods to one- and two-band extended Peierls–Hubbard models. In R4[Pt2(pop)4I]nH2O [R = Na, K, NH4, (CH3(CH2)…
Silicon-based microelectromechanical system (MEMS) devices are made from single-crystal silicon, polycrystalline silicon (polysilicon) films obtained by low-pressure chemical vapour deposition and certain ceramic films. For high-temperature applications, SiC films are being developed to replace polysilicon films. Trib…
In this article, we present an experimental study of the formation of a Langmuir–Blodgett (LB) monolayer of alkanethiol-encapsulated gold particles. We developed a procedure for preparing the LB spreading suspension from an aqueous gold colloid, and we fabricated a large-scale densely packed monolayer of alkanethiol-e…