Materials Literature
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The mechanical properties and processing performances of conventional magnesium alloys still could not meet the need of important application fields due to some demerits, such as poor formability, low creep resistance and unsatisfactory strength at elevated temperature. Recent investigations have shown that additions…
In this letter, we address the design of thin planar retrodirective reflectors via transformation optics. Exploiting form-invariant transformations of Maxwell's equations, we derive the constitutive properties of an anisotropic and spatially inhomogeneous transformation-medium coating which, laid on a flat metallic su…
Electron paramagnetic resonance (EPR) has been used to study the properties of trapped electrons or holes in XLPE and in 12.5% vinylsilane-treated SiO2nano-particles in XLPE specimens. Both electrically unstressed and electrically stressed (up to 25 kV/mm) specimens were used. The EPR spectra of both materials indicat…
Degree of poly (lactic acid) (PlA) foil degradation by the filamentous fungi i.e. Aspergillus ustus, A. sydowii, A. fumigatus, Paecilomyces lilicanus and Penicillium verrucosum has been investigated. A degradation process has been conducted in dynamic conditions at 30°C for 10 days in a medium containing 0.1% of foil…
Pulsed thermoelectric cooling is an attractive approach for the site specific thermal management of infrared sensors and other low-heat flux devices. Intense Joule heating caused by electrical interface resistance, however, can severely degrade pulsed cooling performance. Numerical simulations are used to quantify the…
Formation of the first binary stacks of an intact organocopper aggregate with the arenes naphthalene and 2,2'-bithiophene is reported; crystallographic data suggest that the supramolecular assembly process is supported by Cu-pi, Cu-S, and perfluoroarene-arene pi-interactions.
We have investigated the carbon mono-vacancy in Ta4AlC3 by first-principles calculations. We identify the 2a sites as the probable carbon vacancy sites in Ta4AlC3 based on the energetics of vacancy formation. It was found that introducing carbon vacancies decreased the phase stability of Ta4AlC3. There are no signific…
Kinetic data for structural relaxation in silver iodomolybdates at the glass transition temperature (Tg) are obtained by high-pressure differential scanning calorimetry (HP-DSC) and are compared with activation energies (EA) and volumes (VA) obtained earlier from conductivities below Tg. The results are fitted to an e…
A novel approach for the creation of photopatternable fluorescent polyethylene-based liquid crystal composites was developed. Stretched porous polyethylene (SPPE) films were used as the polymer matrices. A liquid crystalline (LC) photopolymerizable mixture containing nematogenic dimethacrylate, cholesterol-containing…
Vegetable oil-based and potentially biodegradable polyesters were prepared from 9-hydroxynonanoic acid methyl ester. This paper describes ozonolysis of vegetable oils and the method for preparation of useful monomers and in particular 9-hydroxynonanoic acid methyl ester. Ozonolysis of soybean oil and castor oil in met…
Creep-recovery behaviour of natural fibre–biopolymer composite systems, poly(lactic acid)–flax and poly(hydroxybutyrate)–flax, with various additives, was quantitatively resolved into elastic deformation, viscoelastic deformation and viscous flow. Comparative interpretation of creep behaviour between composites with d…
Mechanical reliability such as strength and brittleness is of great interest for application of brittle materials, i.e. glasses and glass fibres. In this paper we study the fracture behaviour and the tensile strength of glass wool fibres (GWFs) of both basalt and E-glass compositions, which play an important role in b…
The dynamics of adsorption and oxidation of CO on Ru(0001) electrode in sulfuric acid solution have been studied using in situ FTIR spectroscopy under potential control and at open circuit, the latter at 20 and 55 degrees C. The in situ IR data show clearly that the bisulfate anion adsorbs on the Ru(0001) surface over…
“Etch and coat” methods, potentially useful for large scale production of superhydrophobic surfaces on metals, have been extended by introduction of a thin 20 nm Au interlayer which allowed thiol surface modifiers to be investigated. Fe, Ti and Zn surfaces modified in this way with a polyfluorothiol generally had lowe…
Thermal process characterization based on calculating effective activation energies from variable temperature diffuse reflection infrared spectroscopy (VT-DRIFTS) measurements is demonstrated. Experimental factors that affect the accuracies of activation energy values are outlined. Infrared radiation scattering effici…
The unique physical properties of nanowires and nanotubes originate from either the small dimensions of the objects, or structural modifications induced by the confined synthesis and surface effects. These features make them very promising for applications in nanoelectronics and nanosensors in particular. In this pape…
Homogeneous partition coefficients (D) for Ra and Ba in calcite were determined from coprecipitation experiments using the Continuous Addition Method (CAM). The D-values derived for Ra and Ba are: DRa = (1.5 ±0.6) ×10-1 and DBa = (1.6 ±1.1) ×10-2. Although these data were derived at low precipitation rates (R) for cal…
This communication shows experimental results that clearly demonstrated the influence of the crystalline surface structure of the platinum electrode on the early stages of the electropolymerization of pyrrole in aqueous media. The platinum surface structure determines adhesion, coverage level, charge transfer properti…
Human beta(2)-microglobulin (beta(2)m) forms amyloid fibrils in hemodialysis related amyloidosis. Peptides spanning the beta strands of beta(2)m have been shown to form amyloid fibrils in isolation. We have studied the self-association of a 13-residue peptide Ac-DWSFYLLYYTEFT-am (Pbeta(2)m) spanning one of the beta-st…
Two dinickel mimics, [LNi2(DMF)4](ClO4)3 () and [L'Ni2(CH3CN)4](ClO4)3 (), for the active site of urease supported by a disubstituted benzoate polydentate ligand were synthesized and fully characterized, subsequently addition of urea afforded two urea adducts, [LNi2(urea)4](ClO4)3 () and [L'Ni2(urea)4](ClO4)3 ().