Materials Literature
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This paper deals with the derivation of a macroscopic model for columnar dendritic solidification of binary mixtures using the volume averaging method with closure. The main originalities of the model are first related to the explicit description of evolving heterogeneities of the dendritic structures and their conseq…
Abstract Moisture (55 wt%) treated silica compounds, bis(triethoxysilylpropyl)disulfide(TESPD)/silica/carbon black/S-SBR was processed in a batch mixer and they were investigated with respect to the alcohol residue level in silane, the processability, the vulcanization characteristics, and the mechanical properties. T…
Abstract Linear and nonlinear oscillatory and extensional flow was studied for polymer layered silicate nanocomposites of organically modified bentonite in ethylene-vinyl acetate copolymer with 18 wt.% of vinyl acetate (EVA18). It was found that the rheological properties of EVA18 nanocomposites were distinctly differ…
Calorimetric and dielectric experiments are presented near the recently proposed Lifshitz point in order to study the nature and properties of the newly suggested phase transitions in the electric-field-temperature (E-T) phase diagram. It was found that both calorimetric and dielectric results obtained across the rece…
Objetivo: Avaliar a ação do dimetil-sulfóxido (DMSO) na necrose distal de retalhos randômicos isquêmicos em ratos. Métodos: Foram utilizados 30 ratos machos, linhagem Wistar, peso entre 220 e 363g e idade média de 3 meses. O retalho cutâneo dorsal (8x2cm) com pedículo cranial foi descolado, reposto em seu leito e sutu…
Abstract The new monoclinic oxide borates Na 2 RE 2 (BO 3 ) 2 O (RE = Dy, Ho) were synthesized using standard solid-state reactions in the temperature range 900 - 950 ◦ C. They are isotypic to the known phases Na 2 RE 2 (BO 3 ) 2 O (RE = Y, La, Nd, Sm-Gd, Er). The single crystal X-ray structure determination of Na 2 D…
Niobian rutile (Ti 4+ 0.63 Nb 5+ 0.14 Fe 2+ 0.11 Ta 5+ 0.08 Fe 3+ 0.02 W 6+ 0.01 Sn 4+ 0.003)� 0.99 O2 from the Greenbushes granitic pegmatite, Western Australia, contains lamellae (~5 � 50 � m in size) of disordered ferrocolumbite (Fe 2+ 0.80 Mn 2+ 0.12 Ti 4+ 0.07)� 0.99 (Nb 5+ 1.48 Ta 5+ 0.28 Ti 4+ 0.13 W 6+ 0.09 Sn…
The morphology and order-to-disorder transition (ODT) of solutions of a low molecular weight poly(styrene- b -ethylene- alt -propylene) in squalane were studied by four different methods: DSC, modulated DSC, rheology, and small-angle X-ray scattering (SAXS). The ordering from disordered micelles to the BCC morphology…
The dielectric barrier corona discharge (DBCD) in a wire-cylinder configuration and the dielectric barrier discharge (DBD) in a coaxial cylinder configuration are studied. The discharge current in DBD has a higher pulse amplitude than in DBCD. The dissipated power and the gas-gap voltage are calculated by analyzing th…
Ca1-xLa xTiO3 powders were prepared by the polymeric precursor method. X-ray diffraction (XRD), FT-Raman spectroscopy, transmission electron microscopy (TEM), and N2 and CO2 adsorption were used for the microstructural and surface characterization of the powders. Room temperature photoluminescence (PL) was observed in…
Este trabalho teve por finalidade analisar algumas características de misturas de solo, cimento e cinzas de bagaço de cana-de-açúcar para sua possível utilização na fabricação de materiais alternativos de construção. Para tal, amostras de cinzas de bagaço de cana-de-açúcar foram submetidas a um tratamento prévio que c…
The development of X-ray photoelectron spectroscopy (ESCA, XPS) is reviewed from an historical perspective that is relevant to its use for analytical chemistry. The emphasis is on early development of the technique, primarily during the period, 1964–1977. During these years there were significant developments in instr…
Plasma sprayed metal end connections of metallized film capacitors are the weak link for pulse power applications which involve discharge times of tens of microseconds and less. This problem will only get worse with increased capacitor energy density. The present contribution quantifies the relationship between the "q…
A framework is presented for understanding charging processes in low vacuum scanning electron microscopy. We consider the effects of electric fields generated above and below the specimen surface and their effects on various processes taking place in the system. These processes include the formation of an ionic space…
A simple kinetic model of temperature-dependent processes accompanying the writing and decay of diffraction gratings in a polymer matrix doped with azo-dye chromophores under illumination with spatially modulated and linearly polarized light is introduced and studied using Monte Carlo simulations. The model generalize…
Abstract We have created one‐ and two‐dimensionally structured polymer networks dispersed in a liquid‐crystal solvent using a holographic exposure technique. These structures have potential for electrically switchable, reverse‐mode, polarization selective and non‐selective diffractive optical elements. Using a simple…
O processo de peletização consiste na aglomeração por via úmida de pós de uma substância ativa e excipientes sob a forma de unidades esféricas. Estas unidades esféricas, denominadas pela expressão anglo-saxônica pellets, diferem de grânulos obtidos pelo processo clássico de granulação no que respeita às característica…
A description of the preparation of zirconium oxide (ZrO2) polycrystalline powder by the sol–gel method is presented. To prepare ZrO2 powder to be used as a thermoluminescent (TL) phosphor in dosimetric application, it is necessary to analyze some structural properties before, such as it’s crystallinity. In this work,…
We have grown single crystals of a Li 6 Gd(BO 3 ) 3 :Ce (LGBO:Ce) scintillation phosphor modified with sodium. The thermostimulated luminescence curves of the crystals of Li 6− x Na x Gd(BO 3 ) 3 :Ce (0.1< x <0.3) exhibit, in addition to the peak at 425 K observed for the initial compound, a new intense peak at 362 K.…
Abstract The average molecular weight and molecular weight distribution of polyhydroxybutyrate can be affected by different bacterial strains, different cultivation time and also different carbon sources. Food waste was proven to have a high potential in the induction of biosynthesis of polyhydroxybutyrate with differ…