Materials Literature
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The results of an investigation of the electronic structure of lithium tetraborate crystals using experimental (x-ray photoelectron spectroscopy) and theoretical (quantum-chemical modeling) methods are reported. The experimental spectrum of the valence-band states of the crystal lies 2–15 eV below the Fermi level and…
To predict phase selection in a ternary eutectic system, approximate growth models of eutectic cells are proposed. Two models are proposed. The first assumes that the growth adjustment should be governed by elimination and branching of the two solid phases and assumes the extreme condition and uses the Burden-Hunt mod…
The objective of this research is to experimentally characterize the spatial distribution of an additive across the thickness of a single-layer polymer film. Concentration-distribution data are then used to quantify the amount of additive that diffuses from the bulk of the film to the film surfaces as a function of ti…
The dinucleating phenolate-hinged ligand 4-tert-butyl-2,6-bis[bis(2-pyridylmethyl)aminomethyl]phenolate (bpbp–) has been used to prepare a series of FeIIIMII complexes containing independent species at the exogenous binding sites. These sites are occupied by fluoride and water ligands and show the general formulation…
Collagen, as a fibrous protein constituting approximately one third of the total protein in the body is synthesized by fibroblasts and is a major component of extracellular matrix in many tissues such as vessels, heart, kidney, liver, skin, tendons, bone and cartilage. The collagen molecule consists of three polypepti…
A cylindrical coordinate separation-of-variables solution is developed for the determination of the internal and the near-surface electromagnetic fields for the arrangement of a focused beam incident upon a homogeneous infinite circular cylinder. The angle of incidence and the focal point location of the beam, as well…
This paper reports initial results in the application of shape memory polymer (SMP) technology to the active disassembly of electronic products. The smart material SMP of polyurethane (PU) composition was employed. Created for these experiments were novel SMP releasable fasteners, with which it is possible to effectiv…
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…