Materials Literature
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The electroreduction of nitrate ions is investigated in acid and neutral aqueous solutions (HClO 4 and NaClO 4 as electrolytes) at polycrystalline copper electrodes, copper single crystals and at copper particles deposited in polyaniline (PANI) layers. In the presence of low nitrate concentrations (5 mM), the reductio…
The crystal of a (ethylenedioxytetrathiafulvalenoquinone-1,3-diselenolemethide, 1 ) 2 ·FeBr 4 ·(1,2-dichloroethane, DCE) 1/2 salt obtained by electrochemical oxidation of 1 in DCE containing a supporting electrolyte, NBu 4 ·FeBr 4, exhibits metallic conductivity down to 0.45 K. The negative magnetoresistance of the el…
In this paper, a series of polyaniline (PAn) nanostructures from fiber to star-like, net-like and coral ball are prepared by controlling the synthesis conditions, including monomer/stabilizer ratio, pH, and reagent adding method and rate, in diffusion polymerization. Products are characterized by FTIR, SEM, and XRD. P…
In this Brief Report, we study the dispersion relations of plasma waves which propagate parallel to the surface of the single-walled metallic carbon nanotubes. We use the classical electrodynamics in our calculations. Electronic excitations on the nanotube surface are modeled by an infinitesimally thin layer of the $\…
Boron-11 nuclear magnetic resonance (MAS NMR) and Raman spectroscopies have been used to study four families of glasses: x Cs 2 O(100− x )ZMW (0< x <10), where ZMW represents the borosilicate glass MW to which oxides Z (Al 2 O 3 , La 2 O 3 and MgO) are added such that, overall, 1.0≤ R (= [modifier]/[B 2 O 3 ])≤2.5; K…
Neutron diffraction and 31 P nuclear magnetic resonance spectroscopy were used to probe the structure of phosphate glass biomaterials of general composition (CaO) 0.5− x (Na 2 O) x (P 2 O 5 ) 0.5 ( x = 0, 0.1 and 0.5). The results suggest that all three glasses have structures based on chains of Q 2 phosphate groups.…
There is continued interest in the problem of extracting structures from x-ray and neutron diffraction data on liquids and glasses. Traditional Fourier transform techniques, with their inherent weakness of possible systematic and truncation artefacts being introduced into the estimated distribution functions, are incr…
Scanning electron microscopic (SEM) moiré method was used to study the surface structure of three kinds of butterfly wings: Papilio maackii Menetries, Euploea midamus (Linnaeus), and Stichophthalma howqua (Westwood). Gratings composed of curves with different orientations were found on scales. The planar characteristi…
Using a density-functional approach, we calculate the principal vibrational spectra of vitreous SiO 2 and vitreous GeO 2 and discuss their analogies and differences. For both glasses, we generate model structures consisting of a random network of corner-sharing tetrahedra and differing only by their packing density. T…
Changing shapes: Metastable spherical aggregates of gold nanoparticles undergo a one-to-one, thermally induced transformation into heterodimers comprising connected plate and spherical domains. By controlling the reaction time, it is possible to isolate a variety of structures differing in the relative sizes of the do…
The ability of dissolved potassium monocarboxylate salts to produce surface passivation and to inhibit aqueous corrosion of copper was studied. The electrochemical measurements indicate that the inhibiting efficiency of these compounds, with a general formula Cn-1H2n-1COOK or CnK (n=3...12), is dependent on the hydroc…
A new one-dimensional heterochiral coordination polymer [Co(bmdt)(N3)2].MeCN (1.MeCN) with well-isolated chains was prepared via a self-assembly process. Magnetic data show that intrachain ferromagnetic couplings via the single end-to-end azide group are observed, which is an extraordinary case among the azide-bridged…
Abstract Polypropylene (PP) and polystyrene (PS) are immiscible and incompatible. Since both PP and PS components possess no reactive functional group, reactive compatibilization of a PP/PS blend is impossible unless certain reactive functional groups are imparted to either PP or PS. In this study we provide a simple…
Abstract Polypropylene (PP) or, in some cases, poly (lactic acid) (PLA) were compounded with cellulosic fibres. The amount of fibres used was in the range 10–30 vol % and, in case of PP, a series of compounds was prepared with a minor amount of maleated PP as a compatibiliser. This matrix was denoted MAPP. Before comp…
In the present paper, the ion dynamics and relaxation of fluoride ions in Pb(1-x)Sn(x)F(2) (with x=0.2-0.6) solid solutions, prepared by mechanochemical milling, are studied in the conductivity formalism over wide ranges of frequencies and temperatures. The conductivity spectra of the investigated materials are analyz…
Hydrogen exhibits the highest heating value per mass of all chemical fuels. Furthermore, hydrogen is regenerative and environmentally friendly. Hence, hydrogen storage is very important for humans. Hydrogen storage in metal hydrides is considered as one of the most attractive methods. In the present work, the hydrogen…
Abstract The total structural energy per primitive lattice cell, density of electron states, spatial distribution of electrons and elastic modulus in fcc Fe–H solid solutions are studied using the density functional theory and Wien2k program package. It is shown that hydrogen increases the density of electron states a…
De-inking paper sludge (DPS) and primary sludge (PS) containing 20% secondary sludge from a paper mill were characterized as to their suitability for the manufacture of medium density fiberboard. Compared with DPS, PS had a lower ash content, higher holocellulose content, more and longer fibers, lower pH, and higher b…
The water absorption and dimensional stability of wood impregnated with melamine-ureaformaldehyde (MUF) and wood impregnated with different nanofiller/MUF formulations were investigated. Three kinds of nanoparticles, Cloisite® 30B, Claytone® APA, and Cloisite® Na+, were selected and mixed with MUF resin, and subsequen…
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