Anion Rotation and Cation Transport in the Rotor Phase α -Sodium Orthophosphate: Paddle-Wheel Mechanism Redefined in View of New Experimental Results
The high-temperature phase of sodium ortho-phosphate, α -Na
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Microwave discharge-assisted catalytic conversion of NO to N2
By coupling microwave discharge with an Fe/HZSM-5 catalyst, novel effects have been observed for the conversion of NO to N2 in the presence of excess oxygen with high efficiency.
Hyperbranched porphyrins—a rapid synthetic approach to multiporphyrin macromolecules
A new class of porphyrin containing hyperbranched polymers has been prepared via proton-transfer polymerisation utilising an A2 + B3 approach, thus providing an accelerated entry into the construction of branched multiporphyrin architectures.
Polyion complex fiber and capsule formed by self-assembly of poly-L-Lysine and gellan at solution interfaces
Different characteristic surface structures such as capsules, regularly spaced droplets, and fibers are formed by electrostatic interaction between poly-L-lysine (PLL) and gellan gum via polyion complex (PIC) formation. Spherical droplet PIC capsules of varying diameters form in solutions. Some dyes adsorb on the surf…
Organic–inorganic hybrid materials. Preparation and properties of dibenzo-18-crown-6 ether-bridged polysilsesquioxanes
Dibenzo-18-crown-6 ether derivatives bearing two (1, 2) or four (3) hydrolysable Si(OR)3 groups have been synthesised. Their hydrolysis and polycondensation gave rise to new hybrid organic–inorganic materials incorporating dibenzo-18-crown-6 ether moieties covalently linked to silica by two or four Si–C bonds. The com…
Surface microarchitectural design in biomedical applications:In vivo analysis of tissue ingrowth in excimer laser-directed micropored scaffold for cardiovascular tissue engineering
A micropatterned microporous segmented polyurethane film (20 x 12 mm in size, 30 micrometer thick) with four regions was prepared by excimer laser microprocessing to provide an in vivo model of transmural tissue ingrowth in an open cell-structured scaffold specially designed for cardiovascular tissue engineering. Thre…
Cyclo-depolymerisation of poly(ethylene naphthalene-2,6-dicarboxylate) and ring-opening polymerisations of the cyclic oligomers obtained
Commercial poly(ethylene naphthalene-2,6-dicarboxylate) (PEN) was cyclo-depolymerised by treatment of a suspension in 1,2-dichlorobenzene at 180 °C with 3 mol% of di-n-butyltin oxide as a catalyst. The cyclic oligomers, produced in up to 93% yield, were characterised by gel permeation chromatography, 1H NMR spectrosco…
A versatile route to organically-modified silicas and porous silicas via the non-hydrolytic sol–gel process
The non-hydrolytic sol–gel route has been used to provide a versatile synthesis of organically-modified silicas (ormosils), via a rapid, facile reaction in the absence of any solvent. The ormosils are synthesised by reaction of silicon halides with alkoxides, where one or both of the reactants contains the organic sub…
In Situ and Ex Situ Studies of Imidazole and Its Derivatives as Copper Corrosion Inhibitors. II. AC Impedance, XPS, and SIMS Studies
The objective of this work was to investigate the efficiency of imidazole derivatives for corrosion inhibition of copper in 0.5 M hydrochloric acid. Corrosion inhibition was studied using impedance spectroscopy. Imidazole and its derivatives 4‐methylimidazole, 4‐methyl‐5‐hydroxymethylimidazole, 1‐phenyl‐4‐methylimidaz…
Synthesis and characterization of new soluble polyesters derived from various cardo bisphenols by solution polycondensation
A series of new polyesters was prepared from terephthaloyl (or isophthaloyl) chloride acid with various cardo bisphenols on solution polycondensation in nitrobenzene using pyridine as hydrogen chloride quencher at 150 °C. These polyesters were produced with inherent viscosities of 0.32–0.49 dL · g−1. Most of these pol…
Improvement in Fatigue Strength of Silicon Manganese Steel SUP7 by Using a Cavitating Jet.
It is possible to strengthen metallic materials by using a cavitating jet to introduce compressive residual stress in the material surface, since the impact of collapsing cavitation bubbles peen the surface in the same way as shot peening. In order to demonstrate the improvement in the fatigue strength of a material b…
15 N NMR study of nitrate ion structure and dynamics in hydrotalcite-like compounds
We report here the first nuclear magnetic resonance (NMR) spectroscopic study of the dynamical and structural behavior of nitrate on the surface and in the interlayer of hydrotalcite-like compounds ( 15 NO 3 - -HT). Spectroscopically resolvable surface-absorbed and interlayer NO 3 - have dramatically different dynamic…
NANOSCOPICS OF DISLOCATIONS AND DISCLINATIONS IN GRADIENT ELASTICITY
Abstract. The results of application of gradient theory of elasticity to a description of elastic properties of dislocations and disclinations are reviewed. The main achievement made in this approach is the elimination of the classical singularities at defect lines and the possibility of describing short-range interac…
Morphology Control of BaMgAl[sub 10]O[sub 17]:Eu Particles: The Use of Colloidal Solution Obtained from Alkoxide Precursor in Spray Pyrolysis
The morphology of phosphor particles was controlled by changing the precursor solution used in the spray pyrolysis. The colloidal and aqueous solutions were obtained using aluminum isopropoxide and aluminum nitrate as the source of aluminum. The characteristics of particles prepared from colloidal solution were compar…
Chain extension and biodegradation of poly(butylene succinate) with maleic acid units
Unsaturated groups were introduced into the main chains of poly(butylene succinate) (PBS) by the condensation polymerization of 1,4-butanediol with succinic acid and maleic acid (MA). The resulting aliphatic polyesters were subjected to chain extension via the unsaturated groups with benzoyl peroxide (BPO), BPO/ethyle…
Unusually high cation-induced fluorescence enhancement of a structurally simple intrinsic fluoroionophore with a donor–acceptor–donor constitution
Upon cation complexation, donor–acceptor–donor–substituted intrinsic fluoroionophore 3 shows red-shifted emission spectra accompanied by an extraordinarily high fluorescence enhancement.
Rapid synthesis of colossal magnetoresistance manganites by microwave dielectric heating
Colossal magnetoresistance manganites have been synthesised by the microwave dielectric heating of metal nitrates, which act both as effective microwave susceptors, and a ready source of oxidizing NO2 to induce mixed valency.
Nature of the transition from two- to three-dimensional ordering in a confined colloidal suspension
We report the results of extensive molecular dynamics simulations of solid-to-solid transitions in two- to six-layer colloidal suspensions confined between two smooth parallel walls. The studies are designed to elucidate the ordered particle packings that interpolate between the structures of two- and three-dimensiona…
The preparation of a polystyrene-iron composite by using ultrasound radiation
Ultrasound radiation is employed to prepare a composite material made of polystyrene and amorphous iron nanoparticles. The thermal stability and magnetic properties are reported. © 2000 Society of Chemical Industry
Electrochemical and Structural Characterization of Ti-V-Ni Hydrogen Storage Alloys with BCC Structure
Various Ti‐V‐Ni hydrogen storage alloys branched from , one of Ni‐substituted alloys, were prepared by an arc‐melting method. All alloys prepared in this work were composed of both black and white phases to a greater or lesser extent. It was found by X‐ray diffractometry and electron probe microanalysis that the black…