Materials Literature
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Temperature dependent dielectric properties of 92% and 99.6% polycrystalline aluminum oxide (Al2O3) substrate materials between room temperature and 550degC are reported, and compared with those of 96% Al2O3. Parallel-plate capacitors with aluminum oxide dielectrics and gold electrodes were used for measurement of the…
Abstract A polydimethylsiloxane (PDMS) modified polyolefin (obtained by reacting an ethylene‐ethyl acrylate‐maleic anhydride (EEAMA) copolymer with an amine terminated PDMS in the melt phase) was used as a processing aid to facilitate the extrusion of linear low density polyethylene (LLDPE). In blends of LLDPE and PDM…
We report the results of investigation on the mechanism of dark conductivity and dielectric relaxation of Bi12GeO20 single crystals and dense ceramics. Alternating current electric characterization was performed in the temperature interval from 30 °C up to 730 °C and frequencies from 1 Hz to 13 MHz. The samples presen…
The aim of this study was to evaluate the benthic diatom composition from the estuary sediment in the Pernambuco State, based on 32 samples. Samples were collected monthly from September through December 1999 (dry period) and from April through July 2000 (rainy period) during four pre established sampling stations. Re…
Liquid-phase sintering of aluminum nitride (AlN) with additives was reviewed. The most important innovation was the discovery of critical sintering aids for AlN densification, specifically rare-earth compounds and alkali-earth compounds. These additives are extremely valuable for increasing thermal conductivity by tra…
The electrical conductivity of molten MCl-NdCl 3 (M = Li, Na, Rb and Cs) has been measured from the liquidus temperature up to ~ 1180 K. The measurements were performed in usual U-shaped capillary quartz cells with platinum electrodes. The molar conductivity (Λ) has been computed by using literature data on the densit…
The absorber materials used in anechoic and semi-anechoic chambers and the field uniformity are described in this paper. The field uniformity of anechoic chamber is simulated with software HFSS 10.0, Ansoft. A low frequency model for absorber-arrays is obtained using the method of homogenization. The simulation result…
Infrared spectroscopy and electron spin resonance measurements are used to study the properties of porous silicon layers on adsorption of the I2 iodine molecules. The layers are formed on the p-an n-Si single-crystal wafers. It is established that, in the atmosphere of I2 molecules, the charge-carrier concentration in…
Abstract The precipitation hardened high‐copper alloy CuNi1Co1Si (UNS design. C70350) was developed in two tempers in a high strength spring material for small connector devices. The combination of high strength, moderate conductivity, excellent thermal stability and good formability is explained by the microstructure…
The friction and wear properties of permanent mould cast AZ91D magnesium alloy were investigated under dry reciprocating sliding conditions by using a ball-on-disk machine. The results indicated that the wear resistance of the alloy was relatively poorer than those of the other commercial alloys. The wear rate per sli…
In Bi 2 Te 3 -based alloys doped with Cu or Cu–halide, Cu atoms show super diffusion in the interstitial positions. As Cu shows donner properties in Bi 2 Te 3 -based alloys, the thermoelectric properties of these alloys change with aging time because of the decrease in Cu atoms or Cu + ions which are oxidized on the s…
Poly(dimethylsiloxane‐amic‐acid)s have been prepared starting from a fluorinated dianhydride, namely 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride, and a mixture of an aromatic diamine and bis(aminopropyl)‐oligodimethylsiloxane of controlled molecular weight, in different ratios. A solution imidization procedure…
Theoretical and experimental works on the plasticity of carbon nanotubes are reviewed in this paper. Theoretical calculations have clarified that plastic elongation and plastic-bend formation occur only at an appropriate high temperature above the critical tensile strain and the critical curvature for straight nanotub…
The crystal structure of chromian pumpellyite from Sarani in the Russian Urals was refined using complementary time-of-flight neutron and X-ray Rietveld methods, to investigate the crystal-chemical behavior of chromium in pumpellyite. The average chemical composition of the sample is CaO 22.06 ± 0.39, MgO 3.95 ± 0.37,…
Transmission electron microscopy has been used to investigate the (1100) and (1103) inversion domain boundaries in a ZnO film prepared by molecular beam epitaxy. The inversion domain was revealed by dark-field images and confirmed by convergent-beam electron diffraction. Interacting with a (0002) stacking fault, the i…
Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Florida, USA, August 5 – August 9, 2007
Highly compact (99%) solid electrolyte Ce0.8Gd0.2O1.9 with submicron (0.3 μm) grains is synthesized. The dilatometric (20–850°C) and conductivity (180–350°C) measurements are performed on the electrolyte in air and as a function of the partial oxygen pressure $$p_{O_2 } $$ (0.21−1×10−25 atm) at 600, 700, and 800°C. An…
OF SODIUM ALGINATE FILMS The effects of sorbitol and formaldehyde on the morphology, water absorption and mechanical properties of sodium alginate films were analyzed. The morphology of the films indicated the presence of small aggregates in the surface of uncrosslinked films, which disappeared with the crosslinking p…
Nanostructured silver films were deposited on polypropylene (PP) nonwovens by RF magnetron sputter coating to obtain the antibacterial properties. Shake flask test was used to evaluate the antibacterial properties of the materials. Atomic force microscope (AFM) was utilized to observe the surface morphology. Energy-di…
Insoluble glucans synthesized by Streptococcus mutans enhance the pathogenicity of oral biofilm by promoting the adherence and accumulation of cariogenic bacteria on the surface of the tooth. The objective of this study was to investigate the effect of Leuconostoc spp. on the in vitro formation of S. mutans biofilm. T…