Materials Literature
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Reaction of an alkene with aqueous hydrogen peroxide and a catalytic quantity of a heteropolyacid adsorbed onto magnesium, aluminium or zinc oxide leads to complete, rapid cleavage of the alkene to give carbonyl compounds.
This paper presents the science and technology developments in the field of high performance aromatic polyimides and their composites in relation to space applications as follows; 1) Development of polyimides as an high performance materials 2) High perfonnance polyimide film like materials for spacecraft applications…
Rotational molding is one of the most important methods for the manufacture of hollow plastic products. However, there are several unsolved problems that confound the overall success of this technique. Part warpage caused by inappropriate mold design and processing conditions is one of them. An experimental study is r…
A new approach for calculating the temperature coefficients of magnetic parameters is proposed in order to more accurately describe high temperature characteristics of magnetic materials. Using this new approach, the "true" (or instantaneous) temperature coefficient of any magnetic parameter at a specific temperature…
The phase ‘NdMnO 3 ’ has been synthesised and characterised by a combination of electron probe microanalysis, X-ray and neutron diffraction and H 2 -reduction thermogravimetry. NdMnO 3 forms, at ≈1400 °C, over the range Nd 1.00(1) Mn 0.95(1) O 2.92(1) to Nd 0.88(1) Mn 1.00(1) O 2.72(1) . Oxygen contents vary in air ov…
Unsymmetrical teriary amines were oxidized with a few oxidants in the presence of bovine serum albumin to give the corresponding N-oxides of the highest optical purity ever reported (up to 66%) for the reaction of asymmetric oxidation of amines via their kinetic dynamic resolution.
Development of reliable and eco-friendly process for synthesis of nanoparticles is an important step in the field the of nanotechnology. Nanotechnology involves the tailoring of materials at the atomic level to attain unique properties, which can be suitably manipulated for the desired applications. Among them silver…
Iron nitrides were prepared by nitrogenizing α-iron in ammonia gas at temperatures from 100°C to 700°C. In the case using iron foils as a starting material, Fe2-3N and Fe4N were formed as a main crystal phase at the temperature ranges of 450-700°C and 250-400°C, respectively. A crystal phase like to Fe16N2 was formed…
The bundle theory of polymer crystallisation expounded by Allegra (J. Chem. Phys., 1977, 66, 5453; Ferroelectrics, 1980, 30, 195) is revisited as new experimental and simulation results are considered. We propose a framework by which recent evidence of structure formation prior to crystallisation may be understood at…
Itoigawaite, SrAl2Si2O7(OH)2·H2O, is a new member of the lawsonite group found in the Itoigawa-Ohmi district, central Japan. It is orthorhombic, Cmcm, a = 6.031(2), b = 8.945(2), c = 13.219(4) Å, Z = 4. The strongest lines in the X-ray powder diffraction pattern are 4.68 (s) (111), 4.26 (vs) (021), 3.31 (vs) (113), 2.…
Photoinduced nematic (N)-to-isotropic (I) and thermal I–N phase transition behaviour of liquid crystals (LCs) with donor–acceptor azobenzenes was investigated. Photoirradiation of mixtures of the azobenzenes and host LC resulted in N–I phase transition due to trans–cis photoisomerisation of the azobenzenes, and the N…
The condensation of a dipyrromethane with ferrocene aldehyde leads to a single atropisomer of α,α-5,15-bis(ferrocenyl)-2,8,12,18-tetrabutyl-3,7,13,17-tetramethylporphyrin 1; electrochemistry of 1 and Ni-1 reveals two consecutive ferrocene-based one-electron oxidation waves, which are separated by 0.19 and 0.41 V, resp…
A cryochemical synthesis of silver nanoparticles stabilised by poly(2-dimethylaminoethyl methacrylate) (poly-DMAEMA) has been performed; it has been found using optical spectroscopy, dynamic light scattering and electron microscopy that silver sols prepared with these nanoparticles in water, acetone and toluene are st…
Crystal chemical aspects of ferroelectrics AnMnO3n+2 with layered perovskite-like structure (the idealized and real structures, nature of phase transitions, the Curie temperatures, peculiar properties of Sr2Ta2O7, stability of the layered structure, formation of solid solutions) are discussed.
This paper addresses options for using agricultural materials alone or in combination with wood to produce composition panel products. Past research and technology available on a regional basis throughout the world is reviewed first. Agricultural fiber options for North America are discussed and a brief review of perf…
Reactions of europium with copper or silver in molten alkali metal/polytelluride fluxes have produced the new polytelluride compounds, Cu 0.66 EuTe 2 , KCu 2 EuTe 4 and Na 0.2 Ag 2.8 EuTe 4 . All three compounds are stable in air and crystallize as red–brown plates in tetragonal space groups. Cu 0.66 EuTe 2 crystalliz…
This work studies a polypropylene/ammonium polyphosphate/polyurethane intumescent fire retardant material. It reports the foaming expansion under a normal strain and the variation of the apparent viscosity of the heat-treated material measured using a plate–plate rheometer. The loss of the protective character of the…
The aim of the study was to prove the importance of the binary mixture composition and spheronization speed on pellet properties. Extrudates from different binary mixtures of microcrystalline cellulose (MCC) and dicalcium phosphate dihydrate were prepared with a power-consumption-controlled extruder and spheronized at…
Molecular dynamics (MD) simulations based on Tersoff interatomic potentials have been carried out for amorphous silicon carbonitride (Si-C-N) ceramics. Short-range atomic arrangements and self-diffusion behavior in Si-C-N are investigated. In the Si-C-N amorphous network with homogeneously distributed carbon atoms, si…
A total synthesis of cytochalasin D 3 is reported in which the key step is an intramolecular Diels–Alder reaction used to close the 11-membered ring simultaneously introducing the required stereochemistry at four of the stereogenic centres, C(4), C(5), C(8) and C(9). The precursor 21 for the Diels–Alder reaction was p…