Materials Literature
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The use of fuel cells as embarked electrical energy needs a storage system with high dynamic performances [1]. This storage system allows a peak load shaving, and compensates the intrinsic limitations of the main source. The use of supercapacitors [2] for this storage system is quite suitable, because of appropriate c…
Silicon spheres with a size distribution around 1.0 mm diameter, which are applicable to spherical solar cells, were formed by dropping molten silicon through a nozzle in a free-fall tube, namely, the drop method. Here we show a seeding technique for the formation of silicon spheres. In this technique, pure silicon po…
As one of the fundamental prerequisites for composite material applications of single-walled carbon nanotubes, their mechanical properties as reinforcing fillers should be identified in the conventional manner of mechanics of composite materials. In particular, identification of elastic properties under axial tension…
We report on impurity ferroelectricity and ferromagnetic properties in semiconductor-structured CdMnS films. We observed ferroelectric hysteresis in CdMnS. A remnant polarization of 1.72 μC/cm2 and a coercive field of 14.3 kV/cm were obtained in samples with Mn concentration below 2%. The coevaporated CdMnS samples be…
Silylation-based techniques are being actively investigated for dielectric recovery after plasma processing of porous ultralow dielectric constant (low k) dielectrics. A two-step pore sealing and dielectric recovery process was attempted on plasma damaged porous organosilicates (OSG). In the sealing step, an OSG low k…
An Ultracapacitor-based Energy Storage System (UESS) as an alternative to batteries is becoming attractive for Hybrid Electric Vehicles. This energy storage concept requires innovative control methods. In this paper, an UESS composed of two ultracapacitor banks and a boost converter is studied. The control objective i…
This article reports the preparation and characterization of europium-doped zirconium oxide (ZrO2:Eu3+) formed by homogeneous precipitation from propoxyde of zirconium [Zr(OC3H7)4]. The alkoxide sol gel process is an efficient method to prepare the zirconium oxide matrix by the hydrolysis of alkoxide precursors follow…
The paper reports on the results of complex investigations into the physical properties of synthetic quartz single crystals and quartz powders in the temperature range of the α-β transition with the use of neutron diffraction and mechanical spectroscopy. The crystal structure of quartz powders with different average s…
We have investigated the current flow path between the nanotube and the contact electrode in carbon nanotube devices using multiprobe devices. The contact and channel resistances have been evaluated by two methods; transmission-line-model technique and four-probe measurement. By comparing the results, we have found th…
Nanocomposite materials differ from the traditional composite materials in that they provide enhanced properties at comparatively low filler loading with respect to microsize filler. In this research work, silica filled polypropylene micro and nanocomposites were prepared and compared in terms of their thermal propert…
Low carbon 25Cr–35Ni steel (HP type steel) modified with titanium and zirconium has been produced by centrifugal casting. The different phases present in the as cast and aged conditions were described by light optical and scanning electron microscopy with secondary electron imaging and energy dispersive spectroscopy.…
Cost‐efficient ceramic SiCN fibers were produced by the precursor route consisting of four processing steps: synthesis of the polymer, melt‐spinning, curing via electron beam (e‐beam) and subsequent pyrolysis at 1100°C in a nitrogen atmosphere. A special solid and meltable fiber polymer, the so‐called polycarbosilazan…
Microbiologically influenced corrosion (MIC) is very severe corrosion for constructions buried under sea mud environment. Therefore it is of great importance to carry out the investigation of the corrosion behavior of marine steel in sea mud. In this paper, the effect of sulfate-reducing bacteria (SRB) on corrosion be…
A three-dimensional computational fluid dynamics (CFD) model has been created to model high-temperature steam electrolysis in a planar solid-oxide electrolysis cell (SOEC). The model represents a single cell as it would exist in an electrolysis stack. Details of the model geometry are specific to a stack tested at the…
Equimolar copolymerizations of glycolide and L‐lactide were conducted in bulk in the temperature range from 100 to 160°C. The catalytic efficiency of tin(II)2‐ethylhexanoate (SnOct2) and bismuth(III)n‐hexanoate (BiHex3) were compared under identical conditions. Furthermore, four copolymerizations were conducted with b…
A surface coating of silver of CrO 2 nanoparticles at an early stage of growth leads the latter to grow in an anisotropic shape of nanorods. When heating in polymer molecules of polyvinyl alcohol (PVA) in water at ∼90 °C fibrils as long as 10−50 μm (∼300 nm diameter) have developed embedding in the polymer. Small PVA…
Abstract Layer‐by‐layer (LBL) self‐assembly was used to form polymer/clay complexes on paper to enhance its wet strength properties. Initially, alternating layers of poly(allylamine hydrochloride) (PAH) and Kaolin clay were sequentially deposited on quartz substrate and characterized by UV/Vis/NIR spectroscopy as a mo…
Lanthanum strontium manganite ((La 0.8 Sr 0.2 ) 0.9 MnO 3 ; LSM) powder was successfully synthesized by an aqueous gel‐casting technique, using carbonaceous precursors. Both thermal and X‐ray diffraction analysis confirmed that the gel‐casting LSM powder formed a single perovskite phase at 850°C, which is 100°–150°C l…
(0002) textured and epitaxial ZnCo0.07O films were fabricated at room temperature by ion beam deposition on Si substrates. Hall measurement revealed that ZnCo0.07O films were n-type semiconductors with carrier concentrations higher than 1019∕cm3. The carrier concentration of ZnCo0.07O can be manipulated by controlling…
Abstract Estimates of cement phase composition have traditionally been made using bulk chemical analysis and the Bogue calculations, developed over 75 years ago. X-ray powder diffraction analysis provides an alternative with direct phase determination, qualitatively and quantitatively. The Rietveld method to refine mu…