Materials Literature
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Atualmente, um dos problemas que acometem o meio ambiente é a poluição ocasionada pelo descarte de filmes plásticos de polímeros sintéticos sem nenhum controle. Uma das alternativas para minimizar este problema é a utilização de amido na elaboração de materiais biodegradáveis que possuem alta degradabilidade quando la…
Single crystal rods, having nanometer-size diameter, were grown with uniform crystallographic orientation inside a matrix of alumina nanopores. The fabrication process of this nanocomposite structure consists of several stages. First, a highly dense array of alumina pores (about 1011cm−2 and an average diameter of abo…
Highly oriented polypropylene fiber reinforced random PP copolymer composites were produced by film-stacking method. The reinforcing fibers were carded and needle punched and the film-stacked packages were compression molded at different processing temperatures (T=150…170°C) and holding times (t=90…600 s). For charact…
N-confused or inverted porphyrins, a family of porphyrin isomers that contain a confused pyrrole ring connected through its alpha and beta' positions in the macrocycle, exhibit unique physical and chemical properties, like, for instance, the ability to stabilize unusual oxidation states of metals due to the reactivity…
Diagrams potential-pH are plotted for different phase components of corrosive nonmetal inclusions in steels in sulfide-containing media at 25°C, 1 atm (air), and a i = 10−3 mol/l. Thermodynamic peculiarities of their corrosion and electrochemical behavior are analyzed.
Abstract Fluorocarbon films using a monomer, 1H, 1H, 2H‐perfluoro–1‐dodecene were deposited in a continuous radio frequency (RF) glow discharge, the process was carried out in a parallel‐plate RF discharge onto stainless steel reactor in order to produce coating with a water‐and oil–repellent surface. Fourier‐Transfor…
Abstract Pulsed laser deposition (PLD) is used to deposit pure metals (Pt and Au) and a mixture of metals (Pt–Ru) at the surface of a porous aluminum anodic oxide (AAO) substrate. In the case of Pt, thick films (> 300 nm) with pore diameters larger than 150 nm (macroporous), replicating the pore structure of the un…
Knowledge of the nucleation and growth behavior of polymorphs is vital in a variety of industrial applications. With the aid of the growth probability method the nucleus size is obtained as a function of the driving force for crystallization by simulating the growth probability of clusters of various sizes. From these…
Experiments are described on the propagation of corona discharges over the surfaces of cylindrical PTFE and porcelain insulators under positive impulse voltages. A rod-plane electrode arrangement has been used to which a single value of peak voltage, with the same impulse profile, has been applied throughout. Quantiti…
We report the results of fluid transport experiments in aqueous foams under microgravity. Using optical and electrical methods, the capillary motion of the foam fluid and the local liquid fractions are monitored. We show that foams can be continuously wetted up to high liquid fractions ( approximately 0.3), without an…
During particulate solid processing, particle-particle and particle-wall collisions can generate electrostatic charges. This may lead to a variety of problems ranging from fire and explosion hazards to segregation, caking, and blocking. A fundamental understanding of the particle charging in such situations is therefo…
Phthalocyanines are promising molecules which present very attractive properties for nonlinear optical applications of both second and third orders. Different solutions of zinc phthalocyanine in toluene at increasing concentration were investigated by spectroscopic analysis in order to get the best conditions for the…
In neutral and close-to-neutral solutions, which contain no surface-active substances, iron dissolves via a two-step scheme. The transfer of the first electron across the interface involves water molecules that dissociate during the adsorption; the transfer of the second electron limits the process under steady-state…
The effects of Cu addition on the corrosion behavior of austenitic stainless steel in 18.4 N sulfuric acid (H2SO4) at 80°C to 120°C was investigated through anodic polarization, cathodic polarization, long-term immersion, x-ray photoelectron spectroscopy (XPS) analysis, and scanning Auger microscopy (SAM). The additio…
We study the role of interlayer interfaces on the polarization response of ferroelectric-paraelectric bilayers using a nonlinear thermodynamic model. We carry out a numerical analysis for prototypical BaTiO3–SrTiO3 bilayers ranging from 40to800nm total thickness as a function of SrTiO3 fraction. There exists a critica…
Abstract The adsorption of proteins on poly(2‐hydroxyethyl methacrylate) (PHEMA) brushes was systematically investigated from the viewpoint of the size‐exclusion effect of the concentrated brushes. By use of surface‐initiated atom transfer radical polymerization, well‐defined, concentrated PHEMA brushes were successfu…
The effects of the polydispersity of the structure of gold nanoshells and of the limited electron free path in a thin metal layer on the spectra of resonance light scattering of a suspension of two-layer nanoparticles are studied theoretically and experimentally for the first time. It is shown theoretically that both…
An experimental 512kB embedded PCM uses a current-saving architecture in a 0.13μm 1.5V CMOS. The write scheme features a low-write-current resistive device and achieves 416kB/s write-throughput at 100muA cell current. A charge-transfer direct-sense scheme has a 16b parallel read access time of 9.9ns in an array drawin…
Electromagnetic interference (EMI) shielding characteristics of carbon nanofiber-polystyrene composites were investigated in the frequency range of 12.4-18 GHz (Ku-band). It was observed that the shielding effectiveness of such composites was frequency independent, and increased with increasing carbon nanofiber loadin…
Abstract The linear rheology of PP‐TiO 2 composites was investigated as a function of the filler particle size. Small amounts (ϕ = 4.5%) of micron and nano‐sized TiO 2 spherical particles were added to the polymer by melt compounding. In spite of the low particle volume fractions and the weak polymer‐filler interactio…