Materials Literature
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Soluble polypyrrole has been synthesized by In-situ chemical oxidative polymerization method in aqueous solution of pyrrole monomer. The solution contained dodecyl benzene sulfonic acid (DBSA) as a dopant and ammonium persulfate (APS) as an oxidant. The reaction temperature was 20°C for 24 hours. The prepared polypyrr…
Abstract The paper presents the history of diatom studies carried out in the Gulf of Gdańsk and the Vistula Lagoon since the beginning of the 20th century. One aspect of the research focuses on describing the structure of planktonic and benthic communities living in different parts of the area or occurring in their su…
Nanofibrous membranes based on poly (vinyl chloride) (PVC) were prepared by electrospinning. The morphology of nanofibrous was observed under field emission scanning electron microscope (FE-SEM) and effects of instrument parameters including electric voltage, tip to collector distance, and solution parameters such as…
Nanocristais de CaWO4 foram sintetizados pelos métodos de coprecipitação com diferentes razões do solvente (água/etilenoglicol) e processados à temperatura ambiente. Estes nanocristais foram caracterizados por difração de raios X, espectroscopia Raman, espectroscopia na região do infravermelho com transformada de Four…
Low-Ni and Ni-free varieties of duplex stainless steels (DSSs) have been successfully developed for the first time on laboratory scale in SAIL. The alloy compositions for Ni-free and low-Ni (<1.5 wt%) DSSs were evolved through formulation of appropriate chromium and nickel equivalents to achieve an optimum phase balan…
Carbon nanotubes (CNTs) are insoluble in small aromatics, but solubilisation is possible when special solubilisers are added to the solvent. The solubiliser molecules are composed of a large aromatic moiety, which adsorbs to the CNT, and a solvophilic group connected by a short aliphatic chain. The experimental findin…
It was previously reported that Ca-doped (K,Na)NbO3 + ZrO2 could be cofired with nickel inner electrodes in a reducing atmosphere. In the present study, the piezoelectric properties of Sn-doped (K,Na)NbO3 + ZrO2 ceramics were investigated. We prepared Sn-doped (K,Na)NbO3 + ZrO2 ceramics and Ca-doped (K,Na)NbO3 + ZrO2…
The diffuse phase transition in relaxor-based 0.93Pb(Zn1/3Nb2/3)O3–0.07PbTiO3 ferroelectric single crystals is studied by observing the large thermal hysteresis over 100 K of the longitudinal acoustic (LA) phonon. By observing this hysteresis in the LA phonon frequency with different temperature-cycles, it is conclude…
We study the phase-separation kinetics of a binary (AB) mixture confined in a thin film of thickness D with a temperature gradient. Starting from a Kawasaki-exchange kinetic Ising model, we use a master-equation approach to systematically derive an extension of the Cahn-Hilliard model for this system. We study the eff…
The focus in the present work is to study the agro-waste corn husk bio-filler as reinforcement for polypropylene. These materials have been created by extrusion and injection molding. The effect of filler content by 10, 20, 30 and 40 wt. % and mesh sizes of 50~100, 100 and 300 on the mechanical properties was studied.…
The main objective of this work is to synthesize polyaniline/ferric chloride composite and to measure the conductivity of the as prepared composite. And also, to analyze the ability of using Ferric Chloride doped polyaniline as an electrode material for the fabrication of supercapacitor application. By in-situ polymer…
Abstract There are presented the results of researches conducted on the steel cast with surface alloy layer in this work. The measurement of the thickness, hardness and abrasion wear resistance was conducted in accordance with norm ASTM G 65-00. The measurement of the corrosion resistance was conducted in accordance w…
We investigate the effect of surfactants on the problem introduced by Jeong and Moffatt [J. Fluid Mech. 241, 1–22 (1992)] to model the free surface deformation induced by two rollers beneath an infinite interface in a bath of viscous fluid. We demonstrate that the presence of surfactant dramatically affects the shape…
Abstract The paper presents the results of investigations on the resistive structure with a graphene oxide (GO) sensing layer. The effects of dangerous gases (hydrogen and nitrogen dioxide) on the structure were studied; the resistance changes were examined during the flow of the selected gas in the atmosphere of synt…
We explore the possibility of achieving superdirectivity in metamaterials by relying on magnetoinductive waves, short-wavelength slow waves capable of providing rapidly varying current distribution. Using a dimer of magnetically coupled split rings we identify conditions for achieving superdirectivity in terms of the…
El perifiton es un componente de las comunidades bióticas acuáticas, su estudio es importante tanto desde la perspectiva ecológica, para comprender el funcionamiento de los ecosistemas acuáticos, como desde el punto de vista ambiental, pues su composición y estructura pueden servir como indicadores de la calidad del a…
We investigate via Monte Carlo simulations the kinetically constrained Kob-Andersen lattice glass model showing that, contrary to current expectations, the relaxation process and the dynamical heterogeneities seems to be characterized by different time scales. Indeed, we found that the relaxation time is related to a…
Intercalations of metals and silicon between epitaxial graphene and its substrates are reviewed. For metal intercalation, seven different metals have been successfully intercalated at the interface of graphene/Ru(0001) and form different intercalated structures. Meanwhile, graphene maintains its original high quality…
The paper aims to justify the methods for calculating the composite details with curvilinear trajectories of fiber stacking. The novelty of the approach is defined by the fact that following the traditional techniques of stacking the fabrics or prepregs, the mechanics of composites considers quasihomogeneous materials…
Structures induced by deformation in the narrow zone of a contact between two copper plates that is prepared by explosive welding are systematically investigated at the micro-, meso-, and macrolevels. Plastic jets, regions of metal plastic flow anomalous localization, are discovered in areas adjacent to the contact su…