Materials Literature
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CdS 0.65 Se 0.35 nanoparticles are grown in a glass matrix by thermally annealing a base glass material, in which Cd, S, and Se were introduced by diffusion. The starting base material contains no crystalline structure. A comparative study of the confinement effects on the annealed samples using photoluminescence, low…
Numerous nontoxic (resorbable) salts were prepared from cations and anions belonging to the human metabolism, such as Na, K, Mg, Ca, Zn and Fe in combination with chloride, iodide, hydroxide, carbonate, acetate, stearate, glycolate, L-lactate, D-mandelate and various N-substituted α-amino acids. All these salts were u…
Our high-pressure x-ray diffraction experiments on berlinite ${\mathrm{AlPO}}_{4}(\ensuremath{\alpha}\ensuremath{-}{\mathrm{AlPO}}_{4})$ show that it transforms to a crystalline Cmcm phase beyond 13 GPa. The persistence of diffraction pattern up to 40 GPa does not confirm the previous conclusions of high-pressure amor…
In one spatial dimension, the metastable dynamics and coarsening process of an n ‐layer pattern of internal layers is studied for the Cahn–Hilliard equation, the viscous Cahn–Hilliard equation, and the constrained Allen–Cahn equation. These models from the continuum theory of phase transitions provide a caricature of…
The first observation of photorefractivity in ferroelectric liquid crystals (FLCs) is reported here. Dopant chromophores chosen to optimize production of mobile ions and careful control of the wavevector and light polarization are believed to play a decisive role in the observed behavior. The Figure is a schematic ill…
Molecular alignment of liquid crystals using infrared light is presented as a viable alternative to UV-vis irradiation. In this technique, a free electron laser (FEL) is used to vibrationally excite the columnar mesophase of the triphenylene-based discotic liquid crystal HHOT. Upon FEL irradiation the microscopic text…
Electro-chemomechanical expansion and contraction in polypyrrole films synthesized electrochemically from pyrrole in electrolytes of p -phenolsulfonic (PPS) acid has been measured directly in various supporting electrolytes. It is found that the films maintain a high electro-chemomechanical activity and conductivity i…
In only a few years, multiple wavelength anomalous diffraction (MAD) phasing has advanced from an esoteric technique used in only a few favorable cases to the method of choice for solving new macromolecular structures. Before 1994, MAD phasing had been used for fewer than a dozen new structure determinations. In 1999…
Using the kinematical theory of X-ray scattering by crystals with dislocations as developed by Krivoglaz et al. and Wilkens, the dislocation content of compressed copper single and polycrystals was investigated by means of profile analysis of selected diffraction peaks. Measurements of radial intensity distributions I…
Amino‐functionalised siloxanes have been used to increase the number of active sites in leather (and especially suede) available for dye fixation. The use of a second hydrophobic siloxane in conjunction with the amino‐functionalised siloxane, further increases the fastness results. The best results are found for the u…
Photodarkening relaxation under light exposure of a-As2Se3 amorphous films doped with 0.5 at.% of metals Sn, Mn, Sm or Dy and a-AsSe films doped with Sn up to 10.0 at.% Sn was studied in dependence on the impurity and thermal treating. Both factors reduce photodarkening and the degree of reduction depends on the type…
We study the neutron-weighted vibrational density of states $g(E)$ in the i-AlCuFe quasicrystal measured by time-of-flight inelastic neutron scattering (INS). The samples studied were $i\ensuremath{-}{\mathrm{Al}}_{62}{\mathrm{Cu}}_{25.5}{\mathrm{Fe}}_{12.5}$ with different isotopic substitutions. These results are co…
The involvement of sulphate-reducing bacteria (SRB) in microbially influenced corrosion (MIC) of steel and the serious implications associated with their presence in industrial environments have long been known and extensively described. Desulfovibrio desulfuricans ATCC 27774 is an interesting metabolic case of SRB, a…
An atomic force microscope (AFM) was used to measure the distance dependence of the forces between microscopic-size glass spheres coated with gelatin and a solid surface in the presence of aqueous solution. It was observed that the adhesion and binding of microscopic objects on gelatin-coated surfaces is a result of c…
Rietveld structure refinement, 29 Si magic angle spinning (MAS) and 27 Al satellite transition (SATRAS) NMR spectroscopic data are given for three natural samples of meionite and for synthetic end-member meionite. Trends in structural parameters and NMR spectra are discussed for the solid-solution series from marialit…
Film formation from a latex involves interdiffusion of polymer chains. The interdiffusion behavior of polystyrene with H ends, one sulfonate end, and two sulfonate ends are compared via small-angle neutron scattering (SANS) and a direct nonradiative energy transfer technique (DET) at short times. High molecular weight…
Abstract The intercalation complex of a low-defect dickite from Tarifa, Spain, with hydrazine was studied by high-temperature X-ray diffraction (HTXRD) differential thermal analysis (DTA), and ther-mogravimetry (TG). The X-ray diffraction (XRD) pattern obtained at room temperature indicated that the intercalation of h…
Composites of carbon black particles in polyethylene exhibit an unusually rapid increase in resistivity as the applied electric field is increased, making this material commercially useful as current-limiting thermistors, also known as automatically resettable fuses. In this application the composite is in series with…
Recently we reported a study of the thermodynamics of methanesulfonic acid and some of its derivatives. The foundation of these results was a measurement of the heat of reaction of S-methyl thioacetate with aq sodium hypochlorite, leading to methanesulfonic acid. We have reinvestigated this reaction and discovered tha…
Hydrogen in steels causes various types of cracking, which occur when the amount of hydrogen in a steel reaches a critical level. This phenomenon results from excessive internal hydrogen pressure, and is associated with the formation of cracks at material imperfections, for example non-metallic inclusions. Consequentl…