Materials Literature
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A process for wet powder spraying of binder‐free particle suspensions using pulse injection was devised for the fabrication of gas electrodes. The resulting deposited electrodes were found to have fine and uniformly distributed pores, to have good adhesion, and low interfacial resistance on electrolyte substrates. The…
Abstract Summary: We analyze the collapse transition of flexible homopolymer chains in the bond‐fluctuation model employing the Wang‐Landau Monte Carlo algorithm. The coil‐globule transition is followed by a first order transition into a solid state occurring in the collapsed globule. In the thermodynamic limit (chain…
Abstract A new method for the preparation of thermoplastic vulcanizates (TPVs) was successfully applied. Starting with a miscible system of a semi-crystalline thermoplastic polymer and an elastomer precursor, phase separation was induced by the increase in molecular weight during selective crosslinking of the elastome…
This experiment introduces to students the X-ray diffraction and photoluminescence spectroscopy techniques as tools to verify structural order–disorder transformations in solid-state materials. To achieve this goal, Sm 3+ ions were added to a PbTiO 3 lattice by soft chemical synthesis—the so-called polymeric precursor…
A series of copper-cerium oxide catalysts were prepared, and their properties toward the reaction of CO oxidation in hydrogen-containing gas mixtures were studied. It was found that the copper-cerium oxide catalysts are stable, active, and selective in this reaction. The conditions under which these catalysts decrease…
The alkali (Li0.5Na0.5) modified strontium barium niobate (SBN) was prepared by a conventional mixed oxide method. X-ray diffraction was carried out to study the phase changes developed in the sample. Quantitative x-ray analysis was also carried out to study the effect of (Li0.5Na0.5) on the “extent of reaction” in SB…
This work describes the fabrication and development of a polyaniline based conductimetric pH sensor. Two types of drop coated polyaniline films were investigated and it was found that the undoped emeraldine base polyaniline produces the best electrical response to pH. The results obtained show that the lowest conducta…
The static and dynamic yield stresses have been obtained for two different silica‐fumed aqueous suspensions (2.5% and 7.5% v/v). An experimental method proposed by Cheng [D.C‐H. Cheng, Rheol. Acta, 25, (1986), 542–554] for thixotropic systems has been used to obtain the dynamic yield stress. To get the static yield st…
Abstract It is shown that porous Silicon in various geometries and morphologies can be used for novel optical elements by combining theoretical insights with suitable porous structures and some pre‐ and post‐processing of the Silicon. The paper restricts itself to light propagation in the pore direction. Theoretical a…
Nanoporous films of crystalline anatase with intended application in dye-sensitized photovoltaic cells were investigated by NMR cryoporometry, NMR diffusiometry, electron microscopy, and X-ray diffraction. The nanoparticles from which the films were subsequently sintered were prepared in two ways, one with an acidic a…
Pd/ZrO2 nanocomposite materials were synthesised following a two-step procedure. Firstly, tetragonal zirconia was prepared via a chemical route; then it was subjected to an in-situ electrochemical impregnation with palladium nanoparticles. Different process times lead to a different Pd loading in the resulting materia…
Experiments on the heat transfer characteristics and natural circulation performance of the passive residual heat removal system (PRHRS) for the SMART-P have been performed by using the high temperature/high pressure thermal-hydraulic test facility (VISTA). The VISTA facility consists of the primary loop, the secondar…
Composites consisting of different quantities of vapor grown carbon nano-fibers (untreated and oxygen plasma treated) in a polypropylene matrix have been prepared using extrusion and injection molding technique. In order to increase the adhesion between fibers and polymer matrix, oxygen plasma treatment onto the carbo…
Article Direct Bronsted acid-catalyzed derivatization of cellulose with poly(L-lactic acid) and D-mandelic acid was published on May 1, 2007 in the journal Nordic Pulp & Paper Research Journal (volume 22, issue 2).
La 2 ∕ 3 Ca 1 ∕ 3 MnO 3 (LCMO) films have been deposited on (110)-oriented SrTiO3 (STO) substrates. X-ray diffraction and high-resolution electron microscopy reveal that the (110) LCMO films are epitaxial and anisotropically in-plane strained, with higher relaxation along the [1–10] direction than along the [001] dire…
We report on the experimental realization of a magnifying superlens working in the visible frequency range. Our design is based on a metal-dielectric plasmonic metamaterial, which consists of alternating positive and negative refractive index layers.
This review explores recent developments of photoinduced electron transfer systems based on interlocked molecules, especially [60]fullerene ( C 60 ) and porphyrin-containing [2]rotaxanes. A number of synthetic methodologies for the construction of C 60 -containing interlocked molecules with various photo- and electro-…
Abstract An analysis of the steady-state film blowing process based on a two-phase constitutive model that accounts for flow-enhanced crystallization is presented. The amorphous melt phase is represented by a multi-mode Giesekus constitutive equation with a transformation-dependent relaxation time and the semi-crystal…
The article presents a three-dimensional coupled numerical solution of momentum, mass, energy and solute conservation equations, for binary alloy solidification. The interdendritic flow in the mushy zone is assumed to obey the Darcy's law. Microsegregation is governed by the lever rule, assuming local equilibrium at p…
Experimentally observed mechanisms of the formation of oxide structures on metals in electrolytes under electric discharge conditions are described. Processes of the formation of oxide layers generated by an ensemble of independent spark and arc discharges, the formation of films due to nucleation and radial growth of…