Materials Literature
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Electrical discharges may occur in gas, liquid as well as solid insulating materials. This paper describes the investigation results on the discharges in air, silicone oil and low density polyethylene (LDPE) using needle plane electrode system under AC voltage of 50 Hz. The experimental results showed that for dischar…
Mudanças no Índice de Fluxo à Fusão (MFI) foram correlacionadas com o deslocamento da curva de distribuição de massa molar (MWD) geradas pela degradação termo-mecânica do polipropileno (PP) sujeito a múltiplas extrusões. A degradação foi modelada utilizando-se a Função de Distribuição de Cisão de Cadeia (CSDF), que po…
At every phase transition of ferroelectric (FEL) and antiferromagnetic (AFM) RMnO3(R = Y, Ho, Er), one of mirror symmetries is frozen. Some tensor components contributing to second-harmonic generation (SHG) are derived to be linearly proportional to these order-parameters. As a result, we can determine the sign of the…
As membranas cerâmicas encontram larga aplicação, principalmente em processos cujas temperaturas de trabalho são superiores a 250 ºC, como também na separação de soluções em que o pH é extremamente ácido, ou mesmo quando há solventes orgânicos no sistema. Em contrapartida, as membranas cerâmicas apresentam a desvantag…
ZnO:Er(III) nanosystems were synthesized by a combined rf-sputtering/sol-gel (SG) approach. In particular, the adopted route consists in the rf-sputtering of erbium (guest) onto as-prepared zinc oxide xerogels (host) obtained via sol-gel, followed by ex-situ heat treatments in air (300-600 °C, 1-5 h). The obtained sam…
Highly ordered nickel nanowire (50 and 12 nm in diameter) arrays were successfully deposited into the nanoporous alumina template film on a gold-coated silicon wafer. The electrodeposited nickel nanowires have a preferred (220) fibre texture, that is the [110] direction parallel to the wire axis. With electropolishing…
Abstract Rheological properties and extrusion processability have been evaluated for poly(ethylene terephthalate‐ co ‐ethylene isophthalate) (P(ET‐EI)) modified by a styrene‐acrylate‐based copolymer with glycidyl functionality in an extruder. Adding a small amount of the modifier enhances melt elasticity to a great ex…
Four new complex salts trans[RuIICl(pdma)2LA][PF6]n [pdma = 1,2-phenylenebis(dimethylarsine); LA = 1,4-bis[E-2-(4-pyridyl)ethenyl]benzene (bpvb), n = 1, 1; LA = N-methyl-1,4-bis(E-2-(4-pyridyl)ethenyl)benzene (Mebpvb+), n = 2, 2; LA = N-phenyl-1,4-bis(E-2-(4-pyridyl)ethenyl)benzene (Phbpvb+), n = 2, 3; LA = N-(2-pyrim…
Abstract Nanocomposites made of polymer-derived Si–C–N ceramic reinforced by single-wall carbon nanotubes (SWCNTs) were prepared for the first time. The synthesis procedure involved ultrasonic dispersion of the nanotubes into a liquid polysilazane precursor polymer, followed by cross-linking and thermolysis. With the…
In this letter, the broadband notch filter exhibiting a flattened bandstop spectral response is experimentally demonstrated for the first time by using the guided-mode resonance associated with the periodic subwavelength structure possessing asymmetric binary grating profiles. The proposed filter consisting of grating…
The crystal structure of vlasovite, Na-2 Zr (Si4O11), from the Kipawa alkaline complex, Quebec, Canada, monoclinic, a 11.0390(5), b 10.0980(3), c 8.5677(4) angstrom, beta 100.313(1)degrees, V 939.6(1) angstrom(3), space group 4,72/c. Z = 4, D (calc.) = 3.008 g.cm(-3), was refined to all R, index of 1.9% based oil 1352…
Equal-channel angular pressing (ECAP) process was applied to a 12 mm × 12 mm × 80 mm billet of pure copper (99.98 wt.%) at room temperature. The shear deformation characteristics, microstructure evolution, and tensile properties were investigated. A combination of high strength (∼420 MPa) and high elongation to failur…
Abstract The thin films containing transition metal complex tris(1,10‐phenanthroline) ruthenium(II) Ru(phen) 3 Cl 2 (abbr Ru(phen) 3 , phen=1,10‐phenanthroline), and 12‐molybdophosphoric acid [PMo 12 O 40 ] 3− (abbr PMo 12 ) were fabricated on quartz, silicon and ITO substrates by layer‐by‐layer (LBL) method. The LBL…
Abstract A three-dimensionally ordered array consisting of highly monodispersed nanoporous carbon spheres with a novel starburst structure was successfully fabricated via the self-assembly of mesoporous silica/carbon composite spheres and the subsequent dissolution of the silica templates.
High-temperature mass spectrometry was used to determine the Gibbs energies, activities, and chemical potentials of SrO and SiO2 in glasses and melts of the SrO-SiO2 system in the temperature range 1840–1970 K. Negative deviations from the ideal behavior were revealed in the system. The standard enthalpies of formatio…
A new conversion coating process for electrogalvanized (EG) steel based on a cerium nitrate (Ce[NO3]3) solution with some additives has been developed that reduces the total treatment time to 70 s. The corrosion current densities of untreated and treated EG samples have been monitored during exposure to 0.5 N sodium c…
ence, has been oriented to material science and Laser triggering in order to increase the reproducibility of excess of power production during loading of palladium with deuterium. Isoperibolic calorimetry in gas phase, isoperibolic and flow calorimetry with electrochemical systems have been carried out. Nuclear ashes…
Transparent artificial boundary conditions and an algorithm for computing the augmented scattering matrix are proposed for finding surface waves in a prescribed range of decay rates. An infinite-dimensional fictitious scattering operator is constructed that determines all waves decaying exponentially with distance fro…
The desorption of Cs and Na atoms from the corresponding layers applied to a gold film deposited on textured tungsten ribbon with a preferred orientation of the (100) surface is studied by thermal desorption spectroscopy with the products of thermal desorption scanned on a pulsed time-of-flight mass spectrometer. The…
An X-ray diffraction study of the electric field-induced metal–insulator transition (MIT) of a vanadium dioxide (VO 2 ) film on a sapphire (001) substrate, which exhibited MIT at a temperature of approximately around 68 °C with a three-order change in resistivity, was performed. A simple device fabricated using a VO 2…