Materials Literature
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A flexible piezoelectric composite with 0-3 connectivity, made from Lead Zirconate Titanate (PZT) powder and vegetable-based polyurethane (PU), was doped with small amount of semiconductor powder. As a result a composite with 0-0-3 connectivity was obtained. The nature of absorption and steady state electrical conduct…
Films of titanium nitride deposited by physical vapor deposition on 304 L stainless steel substrates were hot isostatic pressed (HIP) under 150 MPa at 550 °C. To study the effects of this treatment on the microstructure of those films, X-ray diffraction analyses, Rutherford Backscattering spectroscopy, scanning electr…
The development of simple methods for removal of heavy metals from aqueous samples is a relevant field of research. In this connection, the electrodeposition of the Cd+2 ion, one of the most toxic species for animals and human beings, was investigated in aerated pH 4.8 sulfuric-sulfate solutions. In potentiostatic con…
In this work, several tests of thermal cycling under constant load are carried out on Ti-45.0Ni-5.0Cu (at%) shape memory wires. The properties related to the Stress Assisted Two Way Memory Effect (SATWME) of the material are investigated as a function of the mechanical loading history for the same temperature range du…
In this work we obtained microporous and mesoporous silica gels by sol-gel processing. Tetraethylortosilicate (TEOS) was used as precursor. Nitric acid and hydrofluoric acid were used as catalysts. In order to study the affect of formamide as drying additive, we used a molar ratio alkoxide/formamide of 1/1. The perfor…
Zirconia/stainless steel composites have been prepared by a wet processing method with metal volume concentration ranging from 15% to 30%. The composites were characterized by electrical and mechanical measurements. The dependence of the electrical properties of these composites with the metal concentration presents a…
A natural bentonite sample from Argentina was activated by sulfuric acid in different concentrations (20 and 40 wt%) and different contact time (120 and 210 min), at the same temperature (90 °C) . The ratio of the mass of clay to the volume of acid solution was 1:10 (w/v). These materials were tested to verify its ble…
The crystal structure parameters and magnetic and electrical properties of La 1− x Ca x MnO 3− x /2 reduced manganites with 0≤ x ≤0.5 are established. These investigations contribute to the understanding of magnetic interactions in manganites without Mn 4+ ions. It is found that these manganites show a long-range anti…
Abstract This paper reviews the effects of polymer macrostructure (molecular weight and the styrene content of SBR) and diene microstructure on the fracture and fatigue life of styrene-butadiene rubber (SBR) and butadiene rubber (BR) vulcanizates. Effects of experimental parameters, such as carbon black and vulcanizin…
Polymer-based composite materials are being used extensively in semiconductor packaging as thermal interface materials. In the flip-chip technology these materials are inserted between the chip and the heat spreader and also between the heat spreader and heat sink. The composites generally have a polymer base and high…
Described in this article is an apparatus in which thermopower and resistivity can be measured almost simultaneously from 10 to 300 K in a closed cycle refrigerator system. A distinction of this system is that the samples are mounted on integrated circuit (IC) chips for rapid introduction of the sample into the measur…
The synthesis and characterization of a soluble metal-free polyethyleneoxide-capped phthalocyanine and the corresponding lead compound are described. This phthalocyanine was designed to allow the formation of dimers but to inhibit formation of higher aggregates. The monomer/dimer equilibrium constant in chloroform sol…
The silicon–cerium oxide interface is studied using x-ray photoelectron spectroscopy. The oxidation and reduction of species at the interface are examined as a function of annealing temperature both in vacuum and oxygen ambient, in order to determine their relative stabilities. By depositing a very thin CeO2 film (∼30…
An antireflection surface with sub-wavelength structure has been successfully fabricated on a fused silica substrate. The fabricated antireflection structured surface consists of a microcone array of fused silica with a period shorter than the wavelengths of visible light. The microcone array is made by a reactive ion…
Recent developments in solid oxide fuel cell (SOFC) materials and stacks have been reviewed mainly from the viewpoint of the materials chemistry associated with stack development. Firstly the general features of SOFCs are described to clarify the materials problems which need to be solved and the technology that needs…
Highly conductive and transparent aluminum-doped zinc oxide thin films have been prepared from the solution of zinc acetate and aluminum nitrate in ethanol by the sol–gel process. The effect of changing the aluminum-to-zinc ratio from 0 to 5 at. % and annealing temperature from 0 °C to 700 °C in air has been investiga…
Stable hollow polyelectrolyte capsules were produced by the layer-by-layer assembling of non-biodegradable polyelectrolytes – poly(allylamine) and poly(styrenesulfonate) on melamine formaldehyde microcores followed by the core decomposition at low pH. A proteolytic enzyme, α-chymotrypsin, was encapsulated into these m…
We here tabulate and describe all currently recognized proteins of the phosphoenolpyruvate:sugar phosphotransferase system (PTS) and their homologues encoded within the genomes of sequenced E. coli strains. There are five recognized Enzyme I homologues and six recognized HPr homologues. A nitrogen-metabolic PTS phosph…
We present a new interatomic potential capable of describing the cubic and tetragonal phases of zirconia. From an analysis of molecular‐dynamics simulations of the structural fluctuations in the cubic phase close to the transition temperature, we show that the cubic‐to‐tetragonal transition is displacive. In addition,…