Materials Literature
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In this paper, the influence on optical properties of alkali halides such as CsCl in a covalent glassy matrix has been investigated. Chalcogenide glasses belonging to the (GeS2)-(Ga2S3)-CsCI system with high ratio of CsCl present an entire transparency in the visible range. These glasses maintain good transmission up…
We report the dynamic mechanical behaviour of leather within the temperature range - 100 to 300°C, where three major viscoelastic transitions were identified, termed a, β and y. The β transition peak represents the glass transition temperature of the amorphous region of collagen molecules. It also demonstrates that ta…
Abstract Smectite formation in a vertisol developed from a granitic parent rock in the Kaélé region of Cameroon in a tropical, dry climate was studied by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), chemica…
Abstract In this study, suspension polymerization is described to fabricate microcapsules containing n-hexadecane as phase change material. In the suspension polymerization, casein is employed as emulsifier and stabilizer instead of synthetic surfactant. Microcapsules with polystyrene as shell and n-hexadecane as core…
There has been much investigation into the implementation of field effect transistors; however, a commercial device is still not available. An attempt is made here to develop a ferroelectric gate device using an Al0.3Ga0.7N∕GaN heterostructure with a two dimensional electron gas (2DEG). The ferroelectric copolymer pol…
Large organic single crystals are prepared simply by crystallization from solution. Anthracene single crystals with positive hexagonal plane (5 × 5 × 0.16 mm 3 ), anamorphic hexagonal plane (7 × 4 × 0.19 mm 3 ), and long hexagonal plane (14 × 4 × 0.29 mm 3 ) are obtained using carbon tetrachloride, acetone and benzene…
Researches in the area of gas insulated systems (GIS) reliability are still attracting a considerable attention from the electric utilities and the scientific community in many countries. Solid insulating spacers in GIS represent the weakest points in these systems, and several troubles and systems' outages have been…
Streptoverticillium kashmirense AF1 with the ability to degrade a natural polymer, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) was isolated from municipal sewage sludge by soil burial technique. The PHBV film was degraded by the action of extracellular enzymes secreted by the microorganisms. Degradation of PHB…
ABSTRACT. Biodiversity of cyanobacteria in industrial effluents. In order to study the biodiversity of cyanobacteria in industrial effluents, four different effluents such as dye, paper mill, pharmaceutical and sugar were selected. The physicochemical characteristics of all the effluents studied were more or less simi…
Abstract In this study, the effects of processing parameters on the cellular morphologies and mechanical properties of thermoplastic polyolefin (TPO) microcellular foams are investigated. Microcellular closed cell TPO foams were prepared using a two‐stage batch process method. The microstructure of these foamed sample…
Diamond surface oxidation by atomic oxygen, annealing up to ∼700°C, and in situ exposure to thermally activated hydrogen were studied by high resolution electron energy loss spectroscopy (HREELS). After atomic oxygen (AO) exposure, HREELS revealed peaks associated with CHx groups, carbonyl, ether, and peroxide-type sp…
A printable high-speed thin-film transistor (TFT) fabricated on a regular plastic transparency film is proposed. The carrier transport layer of the TFT is an ultrapure carbon nanotube (CNT) thin film of high density (>1000 CNTs per µm2) formed at room temperature by dispensing a tiny droplet of an electronic-grade…
Four surface activation methods were evaluated on a series of wood-fiber reinforced thermoplastic composites (WPCs) as a means to improve the adhesion of a water-based acrylic coating. Treatments with chromic acid and oxygen plasma performed best, increasing the acrylic coating peel load to WPCs by 170 and 122%, respe…
The effect of Al doping on the magnetic properties of Zn(Cu)O based dilute magnetic semiconducting thin films has been systematically investigated. Epitaxial thin films have been deposited onto sapphire c-plane single crystals using pulsed laser deposition technique. X-ray diffraction and high resolution transmission…
Magnesium, nickel and cobalt hydrotalcite‐like compounds (MgHT, NiHT, and CoHT), with similar M2+:Al3+ ratios were synthesized and characterized by XRD. It was confirmed from XRD that the materials have hydrotalcite‐like structure. MgHT, NiHT, and CoHT were calcined and treated with fluoride solutions in a batch syste…
This manuscript presents the preparation and characterization of polycrystalline ZnO/ZnS nanoribbons decorated by γ-Fe 2 O 3 clusters. The weight percentages of ZnO, ZnS, and γ-Fe 2 O 3 in the product were 22.2, 69.3, and 8.5%, respectively. The nanoribbons were synthesized by a two-step, solution-based method. First,…
The optical absorption spectra from bismuth ferrite (BiFeO 3 ) have been studied at high pressures up to 60 GPa in diamond anvil cells. An electronic transition at which the energy of the optical absorption edge decreases sharply from ∼1.5 eV to zero has been observed at room temperature in a pressure range of 45–55 G…
Biomateriais poliméricos são desenvolvidos para uso como substitutos de tecidos danificados e/ou estimular sua regeneração. Uma classe de biomateriais poliméricos são os biorreabsorvíveis, compostos que se decompõem tanto in vitro quanto in vivo. São empregados em tecidos que necessitam de um suporte temporário para s…
Apesar do desenvolvimento tecnológico e científico, a malária permanece como um dos maiores problemas de saúde a serem combatidos. As estratégias modernas para o controle da doença prevêem ações conjuntas, como o combate do inseto vetor, diagnóstico rápido e preciso, garantia de terapêutica adequada, redução dos casos…
The use of solid-state (17)O NMR to determine local chemical environment and to characterise oxygen dynamics is illustrated in studies of zirconium tungstate, ZrW(2)O(8), and tungsten oxide, WO(3). Simple 1D magic-angle spinning (MAS) NMR allows the chemical environments in ZrW(2)O(8) to be readily characterised, and…