Materials Literature
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The structure and the composition of surface films formed by chemical conversion coating in Dow7 on pure magnesium and magnesium die cast AZ91D have been studied by XRD, XPS, SEM and TEM combined with ultramicrotomy to clarify the growth mechanism. The films are amorphous containing no definite crystallites detectable…
The interaction of ultraviolet laser light of wavelength 308 nm and a pulse length of 28 ns with 24 inorganic oxides was studied. The laser fluence was varied between 0.009 and 4 J cm−2. The visible result of the laser impulse could be divided into three categories. A number of oxides, CeO2, TiO2, Nb2O5, MoO3 and WO3,…
Polyaniline was doped with dodecylbenzenesulfonic acid (Pani · DBSA) in an agate mortar and used as a conductive additive in melt blends with styrene–butadiene–styrene (SBS) block copolymer. These blends exhibit relatively high levels of electrical conductivity at low-weight fractions of the polyaniline complex. The m…
The effect of convection on microstructure formation is examined experimentally and theoretically for the vertically upwards-directional solidification of Al–4.0 wt% Cu alloys. In this alloy system, the rejected solute is heavier than the solvent so that fluid flow occurs due to the presence of radial gradients in tem…
Description Fifty-seven papers provide a diverse and highly technical discussion of the influence of radiation on the microstructure and mechanical properties of structural materials. Nine sections cover: reactor pressure vessel (RPV) steels, austenitic and ferritic/martensitic alloys, proton and spallation neutron so…
Poly(lactic acid) (PLA) has potential for use in disposable and biodegradable plastics. Blending starch with PLAwould increase biodegradability and reduce costs. However, the brittleness of the starch/PLA blend is a major drawback formany applications. The objective of this study was to characterize thermal and mechan…
The preparation and characterization of the α-Keggin-type, novel tri-TiIV-1,2,3-substituted polyoxotungstates with heteroatoms P and Si are described. The molecular structure of K10H2[α,α-P2W18Ti6O77]·17H2O 1, obtained as a main product (30.4% yield) from the 1 ∶ 3 molar ratio reaction of tri-lacunary precursor Na9[A-…
Multi-walled carbon nanotubes, produced from catalytic decomposition of C2H2, were pre-oxidized by boiling nitric acid before being used as support media in a Co/carbon-nanotube monometallic catalyst system. The microstructures of nanotubes and the cobalt particles were examined by using high-resolution transmission e…
Pure silica mesoporous materials that exhibit remarkable hydrothermal stability may be prepared by restructuring calcined MCM-41 via secondary synthesis involving extended recrystallisation.
A series of titania-modified MCM-41 have been synthesized from varying three kinds of titanium precursors [Ti(OBun)4, Ti(OBun)3(acac), Ti(OBun)2(acac)2] respectively and mesoporous molecular sieve MCM-41, in which titania existed as single or double layers. The samples were characterized by powder X-ray diffraction (X…
A series of casting films blended from starch and waterborne polyurethane (STPU) in aqueous solution were prepared. The structure and properties of the films were investigated by infrared spectroscopy, ultraviolet spectroscopy, scanning electron micrography, strength test, thermogravimetric analysis, and different sca…
A suite of polymer-ready nonlinear optical merocyanines has been synthesised and characterised. The tethering functionality—a vicinal dihydroxypropyl residue—is introduced onto the donor nitrogen of the chromophore precursor without the need for protection/deprotection steps, thereby giving ready access to potentially…
High-intensity sound initiates nucleation and helps to control crystal size and habit to yield products that better meet users' specifications.
Platinum nanoparticles accomodating bifunctional thiolate ligands self-assemble into regular superstructures or organize around a large gold particle; the shape of the superstructures can be modulated by addition of water.
Nonrandom porous mullite ceramic preforms were fabricated by the indirect fused deposition process. MgO was added to commercial mullite powders as a sintering aid. The influence of porosity and the amount of MgO on the densification and mechanical properties was studied. The shrinkage and compressive strength of the p…
Characterisation of alumina supported catalysts was performed by TEM and XPS spectroscopy during formation of multiwalled carbon nanotubes from acetylene at 1000 K. TEM images showed that thick carbon fibres (outer diameter is around 20–40 nm) were generated on Fe/Al2O3 and Co/Al2O3 samples. The only sample producing…
Diffusion of hydrogen in the α-phase Pd– and Pd81Pt19–H systems was investigated at 298 K by electrochemical methods in an aqueous solution of H2SO4. Smooth or Pd-black covered specimens were used. The concentration of hydrogen in the metal matrix was gradually increased by control of the electrode potential; equilibr…
The investigation of the partitioning equilibrium in real polymer systems by Monte Carlo (MC) simulations is reported. In contrast to ideal chain treatments the factors such as flexibility and excluded volume in real chains, the finite concentration of macromolecules φ, and polymer adsorption on pore walls of the attr…
A deep understanding of the two-step, one-flask synthesis of meso-substituted porphyrins requires characterization of the acyclic oligomers, which typically constitute ≥50% of the products. We have employed laser desorption mass spectrometry (LD-MS) to obtain a qualitative yet high resolution view of the oligomer cont…
Equiaxed solidification of steel was investigated with emphasis on the nucleation on titanium nitride (TiN). Ferritic stainless steels bearing different amounts of titanium and nitrogen were remelted using a gas-tungsten-arc welding, and equiaxed grain formation was examined in the as-solidified welds. It was found th…