Materials Literature
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The catalytic activity of the CoO/CeO 2 and CuO/CoO/CeO 2 systems in selective CO oxidation in the presence of hydrogen at 20–450°C ([CuO] = 1.0–2.5%, [CoO] = 1.0–7.0%) is reported. The maximum CO conversion ( X ) decreases in the following order: CuO/CoO/CeO 2 ( X = 98–99%, T = 140–170°C) > CoO/CeO 2 ( X = 67–84%, T…
(1-x)(Bi1/2Na1/2)TiO3-xBiAlO3 [BNTA100x (0 ≤ x ≤ 0.14)] ceramics were prepared by a conventional ceramic fabrication process. Single-phase perovskite structures were formed when x ≤ 0.08 for BNTA100x. The depolarization temperature, Td, at which piezoelectricity disappears, decreased with increasing x. The piezoelectr…
We report on the fabrication and characterization of large-area 2-D square arrays of subwavelength holes in Ag and Al films. Fabrication is based on thermal nanoimprint lithography and metal evaporation, without the need for etching, and is compatible with low-cost, large-scale production. Reflectance spectra for thes…
The present paper focuses on the epipelic cyanobacteria and algae (particularly desmids). Altogether 45 sediment samples were taken at ponds covering a pH/conductivity and trophic gradients. Statistic evaluation based on environmental variables measured, divided localities into four major groups differing also by sedi…
The generation of surface plasmon interference patterns using a dielectric diffraction grating with a metal film applied in the substrate region is studied. It is shown by way of numerical simulation within the rigorous electromagnetic theory that high contrast interference patterns with a period several times smaller…
The present study is focused on fabrication of high-purity submicrometer alumina ceramic particles (predominantly in sub-100 nm range) from micrometer-sized feed (e.g., 70-80 mum) using sonofragmentation. The effects of various parameters such as ultrasonic frequency, feed concentration, sonication time, surfactant, a…
We have developed a ferroelectric gate field effect transistor (FeFET) with a stacked oxide structure of ZnO/Pb(Zr,Ti)O 3 (PZT)/SrRuO 3 (SRO) on a Pt/SiO 2 -coated silicon substrate. The PZT film which acted as a ferroelectric gate insulator was completely oriented in the (111) direction. The well oriented PZT film wa…
Tellurite glasses of the xNb2O5–(100–x) TeO2, (3 ≤ x ≤ 20 mol%) system have been prepared and studied by IR spectroscopy and differential thermal analysis to explore the role of Nb2O5 on their structure. IR analysis indicates that NbO6 transforms TeO4 units into tellurite structural TeO3 units, with a shift of lattice…
Tetragonal Nb-doped Pb(Zr0.3Ti0.7)O3 (PNZT) films with a lead oxide seeding layer were deposited on the Pt(111)/Ti/SiO2/Si(100) substrates by sol-gel processing. The as-grown PNZT films with thicknesses ranging from about 0.08 to 0.78 μm show highly a-axis preferential orientation, and their ferroelectric and piezoele…
A narrow part of Fe2O3–Bi2O3 phase diagram was re-investigated in order to elaborate single crystals of the multiferroic BiFeO3 (BFO). Centimeter-size single crystals were successfully obtained by flux method, and present a preferred growth direction. X-ray diffraction studied have highlighted that the growth directio…
A polycrystalline sample of superconducting LaFePO was prepared in a tin flux at 1123 K. The structure was determined from single-crystal data (ZrCuSiAs type, P4/nmm, a = 3.9610(1), c = 8.5158(2) Å , Z = 2), and the phase analysis was performed by the Rietveld method. LaFePO is Pauli-paramagnetic and becomes supercond…
Abstract From results of testing materials using a new filler, it was recognized that the wet skid resistance of tires is determined not only by dynamic properties of the tread compounds, but also by elastohydrodynamic lubrication, especially on the micro scale. By reviewing the basic concepts of friction under dry an…
A two-dimensional (2D) foam can be characterised by its distributions of bubble area and number of sides. Both distributions have an average and a width (standard deviation). There are therefore at least two very different ways to characterise the disorder. The former is a geometrical measurement, while the latter is…
The corrosion and anodic dissolution behaviors of pure aluminum in Na2SnO3-containing 4 mol·L−1 KOH methanol-water mixed solutions with a methanol/water volume ratio of 4:1 were investigated. This was carried out by means of hydrogen collection, polarization curve, galvanostatic discharge, scanning electron microscopy…
Polyurethanes (PU) and their polymeric derivatives are widely used in the manufacturing of medical devices. It is important to understand how protein adsorbs onto PU materials as this molecular process directly implicates surface biocompatibility. In this work, we compared protein adsorption at the PU film surfaces wi…
It has been proved earlier that electric properties of polymer insulation can be improved by addition of nano-sized inorganic filler. These materials have attracted a lot of attention. With the addition of nano sized MgO filler in Low Density Polyethylene (LDPE), several improvements in material properties were observ…
Preparation of nanomaterial dispersion or nanofluids requires good characterization techniques, including particle size and morphological measurements. A reliable and straight-forward process to characterize and quantify the degree of dispersion and agglomeration is needed. A wet-cell transmission electron microscope…
Most single-wall carbon nanotube field-effect transistors show significant hysteresis in their transfer characteristics between forward and reverse gate bias sweeps. It was proposed that the hysteresis is due to a dynamic charging process at the carbon nanotube-dielectric interface. We have studied the charge injectio…
The reaction of lanthanide oxohalides with CuO and SeO 2 gave the products Cu 3 Ln(SeO 3 ) 2 O 2 X (Ln = lanthanide, X = Cl, Br). The oxochlorides are formed with all lanthanides, while oxobromides are formed only for Ln = La-Gd. The structures of the Cu 3 Ln(SeO 3 ) 2 O 2 Cl phases for Ln = Nd ( I ) and Y ( II ) were…
Abstract Sulfate‐reducing bacteria (SRB) have been identified as the main corrosive microorganisms causing unpredictable failure of materials. In this present work, a strain of thermophile SRB isolated from Bohai oilfield of China has been characterized and preliminarily identified. Furthermore, its effects on carbon…