Materials Literature
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An overview of electron backscatter diffraction is presented in which experimental procedures are reviewed together with a basic theoretical description of the mechanism of pattern generation. Manual and automated indexing procedures are described. The new technique of orientation imaging microscopy is presented, with…
A new series of iron(ii) spin-crossover materials of formula [Fe(NH2trz)3 ]X2xH2O [X=1-naphthalene sulfonate (1ns), 2-naphthalene sulfonate (2ns), 4-hydroxy-1-naphthalene sulfonate (4OH-1ns), 4-amino-1-naphthalene sulfonate (4NH2-1ns) and 6-hydroxy-2-naphthalene sulfonate (6OH-2ns)] are reported. The structure of thes…
In order to obtain small, polymer-stabilized particulate carriers for organic iodine to serve as a contrast agent for X-ray computed tomography (CT) an attempt was made to design a carrier based on polymeric micelles. Here we describe the synthesis of an iodine-containing amphiphilic block-copolymer which can micelliz…
Titanium silsesquioxane complexes [Ti(L)(R7Si7O12)], possessing tripodal geometry, represent models for heterogeneous titanosilicate catalysts; the new complexes are exceptionally active and selective catalysts for liquid phase alkene epoxidation reactions.
Outline of optical fibre amplifiers rare earth ions in glasses and transitions for optical amplification fibre materials and fabrications amplification characteristics on fibre amplifiers.
A humidity-sensitive composite film has been synthesized that consists of soluble polyaniline (PAn) and poly(vinyl alcohol) (PVA). PAn gave a percolation threshold where the electrical conductivity rose sharply at a volume fraction of 0.1%. This value is very small compared with that (about 5 vol%) reported in general…
This paper presents a detailed study of the waveguide and plasmon polariton properties of four-layer systems involving highly doped semiconductor material. The dispersion relations of waveguide and plasmon polariton modes are calculated for different geometrical parameters and material properties. Special attention is…
The highest nuclearity complex containing cobalt consists of cubic-close packed planes of hydroxide, methoxide or chloride anions, bridging cobalt(II) centres; preliminary magnetic studies indicate a high-spin ground state and the possibility of superparamagnetic behaviour.
Pyrrole and benzaldehyde were condensed under acidic conditions to produce a mixture of 5-phenyldipyrromethane and 5,10-diphenyltripyrrane; the tripyrrane was utilized in syntheses of meso-phenylsapphyrins, meso-diphenylpentaphyrin and meso-hexaphenylhexaphyrin.
Acoustic cavitation, the primary mechanism of sonochemical effects, is known to be induced more easily by standing waves than by progressive waves. It has been found that acoustic cavitation can be an order of magnitude enhanced by superimposing the second harmonic on the fundamental. Significant synergistic effects b…
Time-resolved studies of luminescence from ytterbium in solution are reported offering opportunities for luminescent imaging in the near IR, and allowing the use of a wide range of aromatic antennae to sensitise the metal centre; the luminescence of the solvated ion and of a wide variety of complexes is examined, both…
ZnS nanocrystals have been synthesized in polymer matrices. Absorption spectrum and small-angle X-ray scattering studies showed that the size of the ZnS nanoparticles wasca. 3.0 nm. Electron diffraction results showed that the ZnS nanocrystals have hexagonal structure. A ZnS nanoparticle/polymer composite as an emitte…
Cu I ions and ligand L self-assemble to generate in solution a mixture of the double helical 1, triangular 2 and square grid 3 complexes, from which 1 has been crystallized and its crystal structure determined.
Mechanical properties of pineapple leaf fiber reinforced low density polyethylene composites have been studied with special reference to the effects of interface modifications. Various chemical treatments using reagents such as NaOH, PMPPIC, silane and peroxide were carried out to improve the interfacial bonding. Both…
Interfaces in liquid-phase sintered Si3N4 materials were investigated employing both analytical and high-resolution transmission electron microscopy techniques (AEM, HREM). Owing to the sintering process that involves the addition of metal oxides to the Si3N4-starting powder, densified materials are composed of Si3N4-…
Synthetic CaCO 3 vaterite obtained by classical routes consists of shapeless particles. However, owing to their small size (50 nm), the particles tend to agglomerate strongly, thus resulting in spherical packs of 3 µm average diameter. Transmission electron microscopy studies of isolated particles are therefore very d…
Efficient second‐order nonlinear optical materials are produced by optimizing the orientation of non‐centro‐symmetrically packed donor–acceptor chromophores. Practical approaches for inducing the favored alignment, for example incorporation of chirality into the chromophore (as shown in the Figure) and H‐bond‐induced…
The modification of poly(propylene imine) dendrimers with apolar endgroups yields effective and highly selective basic extractants of anionic dye molecules from water to solvents, like dichloromethane and toluene.
Ti-β and Ti-MCM-41 catalysts are able to epoxidize methyl oleate using hydrogen peroxide or tert-butyl hydroperoxide as oxygen donors with high conversions and epoxide selectivities.
The evolution of microstructure in dry plain-weave fabric during large shear deformation is described. The entire geometry of the unit cell is defined by four sinusoidal curves in terms of the yarn width, yarn spacing and fabric thickness. The change in microstructure throughout shear deformation prior to wrinkling is…