Materials Literature
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The Rayleigh-Brillouin light scattering in chalcogenide glasses of the Ge-Sb-S system in the (Sb 2 S 3 ) x (GeS 2 ) 100− x ( x = 0–50) set is investigated. The longitudinal hypersonic velocity, the high-frequency longitudinal elastic modulus, the extinction coefficient at the wavelength λ = 0.6328 μm, and the Landau-P…
Sistemas de materiais nanoestruturados são mais comumente definidos como aqueles que contêm pelo menos uma característica microestrutural com dimensões nanométricas (até 150 nm). O interesse em nanocompósitos de matriz cerâmica está associado à melhoria nas propriedades mecânicas e ao desgaste. Dispersões de pequenas…
The influence of different chemical classes of waxes, used commercially as internal and external lubricants, on the processing behaviour of PVC in profile extrusion is described, drawing on the results of systematic laboratory testing. The present study concentrates on long chain ester waxes, oxidised polyethylene wax…
Abstract Modification of Lyocell dopes with special additives enables the creation of new innovative materials. Additives with functional groups and active surfaces may initiate complex chemical reactions in cellulose/ N ‐methylmorpholine‐ N ‐oxide monohydrate (NMMO) solutions. The effect of carboxylic groups on the t…
It is shown that a spatially localized collective excitation of the atomic sublattice (autosoliton) appears and propagates in a structurally unstable crystal occurring in a pretransition state. The autosoliton, on the one hand, is a structural defect comprising two interphase boundaries separated by the second phase,…
Este trabalho reporta a obtenção de nanopartículas de aluminato de zinco dopado com Eu3+, por meio do método de síntese por reação de combustão. Foram preparadas quatro amostras com diferentes concentrações de dopante, para avaliar o efeito do teor de Eu3+ na luminescência dos pós obtidos. Os resultados de difração de…
Abstract Brass films were formed on steel rods by magnetron sputtering by using 63 wt% Cu - 37 wt% Zn target in Ar plasma. The brass plated steel rods were inserted in crude rubber and then cured to form various samples. Rubber-brass inter-reacted layers were investigated by cross sectional TEM observation. Evaluation…
In this article, thermoluminescence (TL) studies on a Sm3+ doped SrB4O7 compound irradiated by an electron beam are reported for the first time. The polycrystalline powder samples of SrB4O7:Sm phosphor were prepared by a solid-state reaction in air at high temperature, and the TL glow curves and TL emission spectra af…
The dispersion of TiO2 nanoparticles in high‐impact polystyrene (HIPS) has been studied. The TiO2 nanoparticles obtained are in a uniform diameter of 20–50 nm and an anatase phase. After being treated by a coupling agent of rear earth‐aluminate, the TiO2 nanoparticles can be dispersed uniformly in HIPS by using a co‐r…
Summary The release of mercury and thallium from liquid eutectic lead-bismuth alloy (LBE) under a flowing Ar/7%-H 2 atmosphere has been studied in the temperature range from 408 to 1292 K using γ-ray spectroscopy. For technical applications such as liquid metal spallation targets or accelerator driven systems, where l…
Two new 5‐substituted 1,3,4‐thiadiazole‐2‐carboxylate esters have been synthesized via ring closure of appropriate tricarbonyl precursors using Lawesson's reagent. The chemistry described is the first report of such methodology in the organic literature. The new materials display broad smectic C phases and show consid…
This research concerned with the use of rice husk (Oryza sativa) as a filler for polypropylene and its recycle ability. Rice husk (200 mesh and 40% by weight) and polypropylene were compounded in a twinscrew extruder and injection moulding technique was applied in order to obtain testing specimens. It was found that t…
The evolution of the plastic strain macrolocalization pattern in low-temperature creep of commercial purity aluminum is studied. The localization pattern depends on a stage in the creep curve. At the stage of steady-state creep, localization zones propagate in the form of a wave traveling with a velocity proportional…
Cesium triborate (CsB 3 O 5 ) is expected to be an efficient harmonic generator in the UV region. However, as-grown single crystals of CsB 3 O 5 often contain a high density of optical scattering centers that significantly reduce device performance. We found that these can be removed by a post-growth heat treatment wi…
This paper presents the results of studying the thermoluminescent (TL) characteristics of Gadolinium-doped Zirconium oxide (ZrO2:Gd) films. Samples were prepared by the spray pyrolisis method depositing them on different substrates using various concentrations of the dopant and exposing to UV radiation of different wa…
Abstract The distribution of substituents of cellulose xanthogenate and carboxymethyl cellulose along the cellulose chains and therefore in relation to the molecular mass can be measured using size exclusion chromatography including a multi angle laser light scattering and mass detection for determining the molecular…
The ionic conductivity and permittivity of glasses based on ZrF4, BaF2, LaF3, AlF3 and NaF (ZBLAN) or PbF2, InF3, BaF2, AlF3 and LaF3 (PIBAL) are studied. The influence of the glass composition on the glass transition temperature (Tg) and on the crystallization temperature (Tx) is reported. For all ZBLAN glasses the t…
Abstract The inclusion of vanadocene dichloride (VDC) and 1,1′-dimethyl vanadocene dichloride (MeVDC) into cyclodextrines (α-CD, β-CD and γ-CD) was studied by EPR spectroscopy. It was found that VDC and MeVDC with β-CD and γ-CD form true inclusion compounds, but with α-CD, VDC and MeVDC gave only fine dispersion mixtu…
To study the behavior of fluorite in SiO 2 ‐Al 2 O 3 ‐Na 2 O‐K 2 O‐H 2 O melts, we conducted both crystallization and dissolution experiments. In the first case, fluorite crystallized from melts enriched in Ca relative to F. In the second case, ground fluorite (<10 μm) was partially dissolved into melts of initiall…
A nonwoven fibrous filter media is modeled as a planar stochastic array of straight lines defining multiple polygons. The cumulative distribution and mean of the hydraulic diameter of these polygons is determined, and related theoretically to the “mean flow” pore diameter commonly measured by commercial partial flow t…