Materials Literature
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Abstract A series of bismaleimide systems containing aliphatic backbone chain have been synthesized and investigated. Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA), Thermomechanical analysis (TMA), rheometry and tensile test were used to characterize the thermal and mechanical properties. I…
To assess the effect of sulfur dioxide impurity on the optical properties and absorption spectrum of glassy arsenic sulfide, we have prepared As 2 S 3 glass samples containing 0.01 to 0.12 wt % SO 2 and have measured their transmission spectra in the range 500–5000 cm −1 . The extinction coefficient of sulfur dioxide…
Most organic coatings, regardless of colour, are pigmented with titanium dioxide (TiO 2 ) to increase their covering power. TiO 2 in its anatase crystal form is highly photoactive under ultraviolet (UV) irradiation. Photo activation of TiO 2 causes the formation of free radicals, which can interact with the organic ma…
It is now well recognized that the increase in global transportation over the last two decades has brought with it an increased potential for the introduction of unwanted microorganisms (aquatic or terrestrial) that may have drastic effects on human and ecosystem health and agriculture. We have developed and validated…
Different kinds of rotor-spun composite yarns are produced by combining staple fibers with filament yarns under various filament over-feed ratios on a modified open-end rotor spinning frame. The effects of filament over-feed ratio on the surface structure of composite yarns were studied and the results showed that the…
Concepts concerning the structure of detonation nanodiamonds were generalized on the basis of data reported in previous publications. The pH value of the nanodiamonds in an aqueous suspension was determined. The mechanism of the longest stage, washing of nanodiamonds with water to remove excess acidity, was considered…
Americanae nace como un proyecto conjunto que surge dentro de la Red Europea de Información y Documentación sobre América Latina (REDIAL), y que ha afrontado la Biblioteca de la Agencia Española de Cooperación Internacional para el Desarrollo (AECID). Esta nueva biblioteca virtual hace más accesibles los libros digita…
Perovskite based oxides have been attracting great interest because of the possible applications in several technological fields such as energy production and gas sensing. The present work focuses on the XPS analysis of three perovskite-based powders: the first is a nanosized La0.6Sr0.4Co0.8Fe0.2O3-δ (LaSrCoFeO) syste…
Abstract Methods for the controlled deposition of ultrathin metal oxide layers onto silver island films for surface‐enhanced Raman scattering (SERS) measurements are reported. Two related deposition techniques are explored for thin film growth: a surface sol‐gel method and atomic layer deposition. Both methods exhibit…
To achieve a narrow product crystal size distribution is a great challenge and of great practical importance in sugar crystallisation. A major cause of the spread of the product crystal size distribution from batch pans is the spread of growth rates associated with the growing sugar crystals. This is termed growth rat…
A new peroxo tungsten complex including N,N bidentate ligand was prepared and characterised, which catalysed H 2 O 2 synthesis of adipic acid and benzoic acid in good yields without organic solvent and phase-transfer catalyst. The reaction is safe, clean and operational in the absence of acidic additives.
Abstract Anti-microbial finishing has been an area of constant interest for processors. In this paper, we carried out studies into the frictional behaviour of the chitosan-coated fabrics. With the increase in chitosan concentration, a decrease in frictional constant values is observed. Test parameters such as normal l…
Long afterglow has been detected in light-excited ZnO quantum dots caused by the spin-dependent tunneling recombination of electron and hole centers. A giant increase in the intensity of afterglow upon a change in the spin orientation of electron and hole centers has been observed under electron paramagnetic resonance…
Experimental investigations are performed to explore the mass transfer during dissolution of solids under hydrodynamic cavitation conditions and to evaluate the effect of cavitation on the dissolution rate after pretreatment of the liquid phase. The results obtained are compared with theoretical data.
Nano-sized SrAl2O4:Eu2+,Dy3+ phosphors with good monodispersity and narrow size distribution were synthesized by the coupling of water-in-oil (W/O) microemulsion with coprecipitation method. The phase composition, morphology, crystallinity, excitation spectra, emission spectra, and afterglow decay of SrAl2O4:Eu2+,Dy3+…
A procedure was proposed for examination of the spatial microdistribution of fissile actinide isotopes ( 235 U, 239 Pu) in various environmental objects (soils, bottom sediments, aerosols, colloid material). Complex analysis of natural actinide-containing microparticles involves α-track radiography (ATR) and neutron-i…
Knudsen effusion mass spectrometric measurements have been performed in the temperature range of 850-950 K over four three-phase mixtures, each phase mixture having at least one phase lying on the MnO-TeO2 binary line of the Mn-Te-O phase diagram, and the rest of the phases lying above this binary line. The three-phas…
Cycloolefin copolymers comprise a new class of polymer materials showing properties, of high glass transition temperature, optical clarity, low shrinkage, low moisture absorption and low birefringence. There are several types of cyclic olefin copolymers based on different type of cyclic monomers and polymerization met…
Abstract Nanocomposites containing poly(vinyl acetate) and montmorillonite (MMT) were prepared using a one-batch emulsion polymerization recipe, assisted by poly (vinylpyrrolidone). The relative clay concentration with respect to the other reaction partners influences drastically the morphological units in the end-pro…
High-temperature nickel-base alloys (superalloys) are widely adopted in industry as materials for structural elements of devices operating upon high temperatures (aerospace turbine blades, etc.). Successful application of these alloys is based on their high mechanical properties. Today, the range of service conditions…