Materials Literature
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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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
Upon cation complexation, donor–acceptor–donor–substituted intrinsic fluoroionophore 3 shows red-shifted emission spectra accompanied by an extraordinarily high fluorescence enhancement.
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.
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…
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
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…
Synthesis and characterization of new nanocomposites of and a sulfonated, alkylated polyaniline derivative [poly( N ‐propane sulfonic acid aniline), PSPAN] are described. Two types of nanocomposites have been produced, one by reaction of vanadium triisopropoxide solutions with N ‐propane sulfonic acid aniline and one…
The ignition and pyrolysis of some copolymers of methyl methacrylate (MMA) with diethyl(methacryloyloxymethyl)phosphonate (DEMMP) have been studied by a simple tube furnace and by isothermal and non-isothermal TGA. The results indicate that copolymers containing DEMMP thermally degrade, under both air and nitrogen, by…
Fluorinated and chlorofluorinated polyimides with high thermal stability and low optical absorption loss in the optical communication wavelengths of 1.3 and 1.55 μm were investigated for low-loss passive waveguide applications. These polyimides were prepared from pyromellitic dianhydride (PMDA) with 1,4-bis-[4-amino-2…