Materials Literature
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Seven anisotropic diimines and their corresponding dinuclear complexes of rhenium(I) have been synthesized. The crystal and molecular structures of one of the dimines and two of the complexes were determined. In common with related imine ligands which have been synthesized previously, the new diimines were mesomorphic…
The effects of “training” and ausforming on the morphology of stress-induced martensite and its reversion behavior to austenite in Fe–14Mn–6Si–9Cr–5Ni and Fe–28Mn–6Si–5Cr (mass%) alloys have been studied using atomic force microscopy (AFM), with the aim of clarifying the mechanism of the improvement of the shape memor…
This paper presents a method based on both artificial neural networks (ANNs) and on a multidimensional optimization procedure in order to significantly reduce the time taken and to improve the accuracy in evaluating parameters of the Jiles-Atherton model of magnetic hysteresis. The main steps of the method are (1) dat…
Bioimmobilization with sol-gel method is a complicate system, involving many parameters that can affect sol-gel structure and immobilized biomolecules activity. In this study, trypsin, a model enzyme, was entrapped into sol-gel glasses produced from tetraethoxysilane (TEOS) and water to study the relationships between…
Electron paramagnetic resonance (EPR) was applied as an in situ technique at high temperatures up to 1000°C for defect chemical and transport studies of ionic and mixed conductors. Equilibrium absorption intensities were examined as a function of oxygen partial pressure temperature and doping content for the model mat…
A recent paper [Pitteri & Zanzotto (1998). Acta Cryst. A54, 359-373] has proposed a framework for the study of the 'arithmetic symmetry' of multilattices (discrete triply periodic point sets in the affine space). The classical approach to multilattice symmetry considers the well known 'space groups', that is, the grou…
Thin Ni layers were deposited onto clean polymethyl methacrylate (PMMA) and poly(styrene-co-acrylonitrile) (SAN) surfaces by a high vacuum thermal evaporation process. The resulting interfaces were studied by X-ray photoelectron spectroscopy. The Ni deposition on PMMA changes the relative intensity of the C1s spectra…
A unified picture of icosahedral cluster solids obtained by comparing Al-based icosahedral quasicrystals to boron-based cluster solids, which consist of icosahedral clusters of the same group III element, B, is discussed. Metallic-covalent bonding conversion in icosahedral clusters of Al and B was demonstrated by mole…
Reactor produced blends of polypropylene (PP) and polystyrene (PS) are obtained by graft copolymerization of styrene onto polypropylene chains. This technique generates simultaneously a graft copolymer (PP-g-PS) and polystyrene homopolymer. The resulting blends, however, have a low impact resistance and have to be mod…
γ ‐ MnO 2 compounds are usually prepared by oxidative electrodeposition at high constant current density from boiling MnSO 4 solutions. Their structure is made of an intergrowth of ramsdellite and pyrolusite blocks (with a percentage Pr (of rotile) of 40–50%) and of microtwinning (Mt) defects (with a percentage Mt > 4…
Radiation effects on zeolite-NaY have been investigated by irradiation with a 500 keV H+ beam. Zeolite-NaY suffers structural damage under proton irradiation. The crystalline-to-amorphous transition occurs at a total dose equivalent to an ionizing energy deposition of 3 × 1010 Gy and a displacement dose of 0.05 dpa (d…
Sn–Pb alloy-loaded polystyrene (PS) composites were processed by powder mixing and hot pressing. For the composites hot-pressed at the temperatures below the melting point of the alloy, the resistivity dropped sharply if the alloy volume fraction reached 20 vol %. When the composites were processed at temperatures abo…
Tesselation of new porphyrin-based network motifs was demonstrated in crystals by incorporation of the diaminotriazine functions in the molecular building blocks. The title compound was synthesized and successfully applied in the construction of a uniquely structured solid which consists of flat multiporphyrin network…
Conducting layers on KrF excimer-laser-irradiated polyimide film surfaces were investigated by XPS, SEM and Fourier transform infrared (FTIR)– Raman spectroscopy. Analysis of polyimide residue after laser irradiation provided valuable insight into the nature of the formation of conducting layers. The subtle different…
The use of solution activators (dissolved metal salts) to enhance aluminum electrochemical activity in organic media is reported. Aluminum is electrochemically passive in most organic electrolytes and unlike lithium, has not been developed as a battery anode in organic media. We demonstrate significant Al activity in…
Thermotropic ionic nematics with moderate transition temperatures are obtained by dissolving alkali metal salts within nematogens bearing a crown ether moiety; in these media, the ions show a significant ‘apparent ionic order’ as measured by quadrupolar NMR spectroscopy.
The antimicrobial activity of chitosan with different molecular weight was studied. E.colii and St.aureus were used as experimental microbial. The effects of the concentration and molecular weight of chitosan were tested respectively and the antimicrobial mechanism was proposed. It was found that for the chitosan with…
Urea-formaldehyde (UF), polymerized in situ in aqueous media, is a rigid polymer that can be used in the controlled release of bioactive molecules. During the process of polymerization, liquid neem seed oil (NSO) was encapsulated at three different loadings, which was then replaced by diclofenac sodium (DS), the prese…
Characterizing the morphology of modified multiphasic polymer systems, as are often applied for improving the impact strength, is normally a complicated and tedious task. Nevertheless, knowledge about the volume fraction and particle-size distribution of the elastomer phase is important for the specific development of…
Formulas for the wave aberrations introduced into a beam by a prism or a plane grating are derived from the theory of plane symmetric systems. Emphasis is made on the field-dependent aberrations.