Materials Literature
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Abstract The degradation of polypropylene–polyethylene copolymers (which were used to make the seats for the Olympic stadium in Barcelona, Spain), in response to natural aging for 2.5 years and artificial aging for 5000 h in a xenon lamp chamber, was studied. The extent of the various photoreactions, including the for…
The aim of this research was to prepare mononuclear ruthenium corroles, because of the well-documented potency of analogous porphyrin complexes in catalysis. The syntheses of the mononuclear nitrosyl complexes [Ru(tpfc)(NO)] and [Ru(tdcc)(NO)] (tpfc=trianion of 5,10,15-tris(pentafluorophenyl)corrole, tdcc=trianion of…
The photoconductivity of TlGaSe 2 layered single crystals are investigated in the temperature range 78–300 K. Both the ac-photoconductivity (ac-PC) and the spectral distribution of the photocurrent were studied at different values of light intensity, applied voltage and temperature. Dependences of carrier lifetime on…
Abstract This work aimed to examine the effect of addition of tire‐tread reclaimed rubber on the properties of two natural rubber (NR) compounds with respect to the reclaimed rubber concentration and mastication time, the properties of interest including rheological and cure characteristics, physical and mechanical pr…
Photoluminescence and structural properties of cadmium sulphide thin films grown by different techniques, J Aguilar-Hernández, G Contreras-Puente, A Morales-Acevedo, O Vigil-Galán, F Cruz-Gandarilla, J Vidal-Larramendi, A Escamilla-Esquivel, H Hernández-Contreras, M Hesiquio-Garduño, A Arias-Carbajal, M Chavarría-Cast…
Electrical treeing is of interest to the electrical generation, transmission and distribution industries as it is one of the causes of insulation failure in electrical machines, switchgear and transformer bushings. In this paper a deterministic electrical tree growth model is described. The model is based on electrost…
The [M(4)(II)L(4)](8+) [2 x 2]-grid-type complexes 1-8 present a set of features of particular interest for potential applications. All complexes exhibit multiple reduction levels at low reduction potentials paired with rather high stability. The modulation of the reduction potentials is possible by introduction of ap…
In an aqueous solution at room temperature, 1,4,8,11-tetraazacyclotetradecane-1,8-bis(methylphosphonic acid) (H(4)L(1)) and Cu(I) (I) form a pentacoordinated (pc) complex, pc-[Cu(L(1))](2-), exhibiting conformation I of the cyclam ring. At high temperature, the complex isomerises to a hexacoordinated isomer, trans-O,O…
The thermally induced motion of nanometer-sized surfactant micelles in water is used to create strong attractive forces between micron-sized disks of wax in a mixed aqueous dispersion of microdisks and microspheres. The short-ranged attractive force due to the depletion of micelles from between the microdisks is much…
Poly-12-hydroxystearic acid (PHSA) is widely used as a coating on colloidal spheres to provide a "hard-sphere-type" interaction. These hard spheres have been widely used in fundamental studies of nucleation, crystallization, and glass formation. Most authors describe the interaction as "nearly" hard sphere. In this pa…
The relationship of the volume and the weight versus frequency for high-frequency transformers is studied. A complete analytical procedure taking into consideration core loss and winding loss (including eddy current loss) is developed. Analytical and experimental results reveal that higher frequency does result in sma…
A family of L-lysine-based low-molecular-weight compounds with various positively charged terminals (pyridinium and imidazolium derivatives) was synthesized and its gelation behavior in water was investigated. Most of the compounds can be very easily synthesized in high yields (total yields >90 %), and they function a…
The author investigates the temperature effects of PM (permanent magnet) motors using neodymium magnets on the torque production capability and on the efficiency of the motor. When PM motors are designed to operate in a wide temperature range, the reversible demagnetization of the neodymium magnets with temperature an…
A strategy for finding transition paths connecting two stable basins is presented. The starting point is the Hamilton principle of stationary action; we show how it can be transformed into a minimum principle through the addition of suitable constraints like energy conservation. Methods for improving the quality of th…
Eutectic two-phase cells, also known as eutectic colonies, are commonly observed during the solidification of ternary alloys when the composition is close to a binary eutectic valley. In analogy with the solidification cells formed in dilute binary alloys, colony formation is triggered by a morphological instability o…
Angle is more important than diameter: (n,n) Single-walled carbon nanotubes (SWCNTs; see picture) are less reactive than fullerene towards exohedral addition reactions. The reactivity of (n,n) SWCNTs towards sidewall addition reactions depends on the pyramidalization angles of the tube C atoms. Even with the same diam…
Bulk and thin film specimens of AgB2 were prepared. The bulk pellets were obtained from the powders of the constituents and the films were produced by cosputtering and sequential sputtering. The specimens were annealed and subjected for X-ray and Auger analysis. Preliminary results seems to indicate that AgB2 is an in…
We report a detailed study of steplike metamagnetic transitions in polycrystalline $\mathrm{P}{\mathrm{r}}_{\mathrm{0.5}}\mathrm{C}{\mathrm{a}}_{\mathrm{0.5}}\mathrm{M}{\mathrm{n}}_{\mathrm{0.95}}\mathrm{C}{\mathrm{o}}_{\mathrm{0.05}}{\mathrm{O}}_{\mathrm{3}}$. The steps have a sudden onset below a critical temperatur…
We provide a detailed description of a model and its computational algorithm for the secondary electron emission process. The model is based on a broad phenomenological fit to data for the secondary-emission yield and the emitted-energy spectrum. We provide two sets of values for the parameters by fitting our model to…
Alpha-, beta-, gamma-, and delta-MnO(2) single-crystal nanowires/nanorods with different aspect ratios have been successfully prepared by a common hydrothermal method based on the redox reactions of MnO(4)(-) and/or Mn(2+). The influences of oxidant, temperature, and inorganic cation (NH(4)(+) and K(+)) template conce…