Materials Literature
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In situ time-resolved X-ray absorption spectroscopy was used to observe the first stage of NiO nanoparticle formation. The spectra of Ni K-edge (and their Fourier transforms) during heating show a systematic structural phase transformation (amorphous to crystalline) near 400 °C. Crystallization occurs during heating o…
Abstract Lanthanide complexes with linear and cyclic octadentate oligopyridine-amine ligands were synthesized, and their molecular structures were determined by single-crystal X-ray crystallography. All of the complexes had a distorted capped square antiprism (CSAP) geometry, and the coordination environments of lanth…
Gas insulated switchgear (GIS) has been increasingly being used in recent years and high reliability and rational insulation design are required. This research provided V-N characteristics (the dielectric breakdown voltage versus number of repetitions characteristics) regarding the internal insulation and creeping ins…
This article reports the sensitization of the glow peak at 300 °C in crystalline quartz by using high doses of gamma radiation. Five lots of samples were prepared from single crystals extracted from different geological occurrences in Brazil. The specimens were submitted to high doses of 60Co radiation starting at 25…
The disposal of cured rubber has become a major environmental problem. Discarded rubber was devulcanized by an open two-roll cracker-cum mixing mill both in the presence or absence of diphenyl disulfide at 120°C (Mechano-Chemical Process, MCP), and then the obtained devulcanized mass was revulcanized again by the addi…
Abstract Nanostructured p‐type and n‐type porous silicon samples were prepared for (100) and (111) orientations and a systematic study is carried out on the effects of orientations, dopant type (boron and phosphorous), current density (20 and 30mA/cm 2 ) and etching time on the formation, optical and thermal propertie…
Abstract In this work the effect of melt mixing condition and of a trans ‐esterification catalyst on miscibility of poly(methyl methacrylate) (PMMA)/polycarbonate of bisphenol A (PC) blends is studied. In particular, at high temperature chemical reactions between PMMA and PC phases can take place; these strongly chang…
OBJECTIVE: The aim of the study was to evaluate the pure titanium castability and internal porosity with 3 different sprue designs. METHOD AND MATERIALS: The sprue designs selected were the conventional cylindrical, funnel-shaped, and sheet-form sprue formers. To evaluate the castability, the mesh monitor was chosen.…
<abstract language="eng">The first days of radioactivity, the discoveries of X-rays, radioactivity, of alpha- and beta- particles and gamma- radiation, of new radioactive elements, of artificial radioactivity, the neutron and positron and nuclear fission are reviewed as well as several adverse historical marks, such a…
Effect of Annealing Temperature on Dielectric Constant and Bonding Structure of Low-k SiCOH Thin Films Deposited by Plasma Enhanced Chemical Vapor Deposition, Lee, Sungwoo, Yang, Jaeyoung, Yeo, Sanghak, Lee, Jaewon, Jung, Donggeun, Boo, Jin-hyo, Kim, Hyoungsub, Chae, Heeyeop
Abstract The imidazole covalently coordinated sandwich‐type heteropolytungstates Na 9 [{Na(H 2 O) 2 } 3 {M(C 3 H 4 N 2 )} 3 ‐ (SbW 9 O 33 ) 2 ]· x H 2 O (M=Ni II , x =32; M=Co II , x =32; M=Zn II , x =33; M=Mn II , x =34) were obtained by the reaction of Na 2 WO 4 ·2H 2 O, SbCl 3 ·6H 2 O, NiCl 2 ·6H 2 O [MnSO 4 ·H 2 O…
The effect of flash lamp annealing applied to ZnO single crystals implanted with 3.6 at. % Fe has been studied. For intermediate light power, the implantation-induced surface defects could be annealed without creation of secondary phases within the implanted region. At the same annealing temperatures, however, ion-bea…
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…