Materials Literature
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Mulita com composição 1,4 Al2O3.SiO2 foi sintetizada a partir de α-alumina comercial (Alfa Cesar Company) e de sílica obtida da calcinação da casca de arroz. Essa sílica possui alta área superficial, alta pureza e pequeno diâmetro médio de partícula. Pós de sílica e de alumina foram misturados na proporção estequiomét…
Technological feasibility of a simplified mixed-oxide (MOX) pellet fabrication process, the short process, was studied. About 300 g of microwave heating denitrated (MH)-MOX powder with adjusted plutonium content to 30% could be successfully processed by a tumbling granulator for subsequent pelletizing and sintering pr…
The generalized Thomas-Kuhn sum rules are used to characterize the nonlinear optical response of organic chromophores in terms of fundamental parameters that can be measured experimentally. The nonlinear optical performance of organic molecules is evaluated from the combination of hyper-Rayleigh scattering measurement…
Abstract Polyamide 66–Lotader ® 2210 blends (95/5 w/w), polyamide 66–Cloisite ® 15A binary nanocomposites (98/2 w/w), and polyamide 66–Lotader ® 2210–Cloisite ® 15A ternary nanocomposites (93/5/2 w/w) were prepared by twin‐screw extrusion, and the changes in mechanical properties, morphology, and flow properties of th…
Published in different sources and obtained experimentally and by calculation data on the physicochemical characteristics, existing methods of producing, principles of manipulation and possible fields of application of nitrous oxide as chemical product are considered.
Abstract magnified image Synthesis of a series of near‐infrared dimeric dyes is presented. The intramolecular dimers contain two chromophores linked with a conformationally flexible ether or oligoether bridge. Optical properties of the dyes are discussed. J. Heterocyclic Chem., (2009).
In this work, the model of grain boundary diffusion from a permanent source along nonequilibrium migratory grain boundaries is considered. Grain boundary nonequilibrium is characterized by a value of boundary excess energy up to which relaxation goes. It is shown increasing excess energy and migration velocity of none…
In this work, the characteristics of the edge emission of a homoepitaxial diamond sample grown by chemical vapor deposition (CVD) are reported. Photoluminescence has been excited at 220 nm by using a tunable optical parametric oscillator laser, giving ∼5 ns wide laser pulses. The temperature of the sample has been dec…
Perovskite-type mixed conducting oxides of SrCo1-ySc yO3-δ (y=0.02-0.7) were synthesized by a combined EDTA-citrate complexing method. Different scandium doping concentrations in SrCo1-ySc yO3-δ have significant effects on the phase structure, electrical conductivity, surface properties and oxygen permeation behaviour…
Abstract Nanolayers were deposited onto surfaces of n-type InP single crystal wafers by electrophoresis from reverse micelle colloid solutions containing palladium nanoparticles. Two types of nanolayers were deposited, by applying a positive potential or a negative potential on the InP wafer. Further, wafers with nano…
Homologous series of Zn k In2O k+3 (k=3, 5, 7) and Zn k InGaO k+3 (k=1, 3, 5) were prepared by solid state reaction method and the crystal structures were analysed by X-ray Rietveld analysis in order to clarify the relationship between their crystal structure and thermoelectric properties. For both the series, the lat…
The effect of surface bond reconstruction (SBR) of Si contact surfaces on phonon transport in Si atomic wire is investigated. Green’s function method is applied to calculate the thermal conductance and local heat currents. Results show that the phonon transport in atomic wires is enhanced significantly by SBR at the t…
Silicon quantum dots have been grown in situ in amorphous silicon nitride (SiNx) films on silicon substrate by plasma-enhanced chemical vapor deposition using ammonia (NH3) and silane (SiH4) as reactant gases. After deposition, films were annealed in N2 atmosphere at temperatures ranging from 700 to 1000 °C for 1 min…
Layered LiNi0.4Mn0.4Co0.2O2 has been synthesized by citrate precursor method. Its magnetic properties are investigated by dc magnetization. The high-temperature susceptibility curve follows the Curie–Weiss law with Curie and Weiss constant 1.435(2) emu K/mol Oe and −112(4) K, respectively, larger than those values rep…
Time series of diatom assemblage composition can be obtained from samples of various collection materials. This allows assessment of 'more natural' conditions and their temporal variability in shallow lakes and ponds, similar to traditional core-based palaeolimnology. Such information is useful to underpin restoration…
Powder samples of TiO 2 :A, where A is Mn, V, Co and La, with dopant concentrations of 0.2%, 0.6%, 1.0%, 5.0%, and 9.0%, were prepared by hydrothermal technique and annealed at temperatures ranging from 450°C to 850°C. The crystalline structure and phase of the samples were investigated by XRD, Raman scattering and SE…
Abstract Preservation of initial polymer/catalyst particle morphology under air, was examined using stopped‐flow Ziegler–Natta polymerization with various quenching conditions and post‐chemical treatments. The exposure of the initial particles to air caused the fast formation of cracks on the surface, finally leading…
An enhanced flow sensor is under development at IMTEK to enable simultaneous fluid characterization and flow velocity measurement. Simultaneous measurement of fluid thermal properties is necessary to measure flow rates accurately by thermal means in cases where fluid properties fluctuate in time. Here, we report the d…
Micro-cantilevers can be used as both sensors and actuators. In this work, the design, fabrication and characterization of piezoelectrically driven nano-crystalline diamond (NCD) cantilevers are reported Diamond films were grown on silicon (100) substrates by microwave plasma enhanced chemical vapor deposition (MW-PEC…
In this paper, current state of research and development on carbon nanotube material is overviewed. A brief description on the author's current results of synthesis and purification technologies, characterization and application potentials of multiwall carbon nanotubes in advanced composite materials, thermal dissipat…