Materials Literature
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Amorphous and crystalline vanadium pentoxide (V2O5) thin films weregrown onto heated glass substrates using spray pyrolysis technique. Aqueoussolution of ammonium meta-vanadat with different concentrations rangingfrom 0.1 to 0.5M was used. X-ray diffraction study of c-V2O5 revealedpolycrystalline films of orthorhombic…
The Polyaniline-sulfuric acid-glucose oxidase (PANI-H2SO4-GOD) electrode has been investigated in the present work. Platinum electrode was used for the synthesis of Polyaniline-sulfuric acid (PANIH2SO4) film using Potentiometric method with 0.2 M aniline, 1.0 M H2SO4 solution, 1.0 pH and 1 mA/cm2 applied current densi…
Pavement friction during wet conditions continues to be a major safety concern for pavement design and maintenance. The skid resistance of pavements is commonly measured using ASTM E 274, Skid Resistance of Paved Surfaces Using a Full-Scale Tire. However, there are no standard test procedures for evaluating the fricti…
The phase relationships in the LaFeO 3 -LaSrFeO 4 system at temperatures in the range 1000–2100°C in air are investigated, and the phase diagram of the system is constructed. One perovskite-like compound, namely, La 2 SrFe 2 O 7 , which belongs to the Ruddlesden-Popper phases, is revealed in the system.
Abstract It was observed the formation of polymeric films derived from 4‐aminophenol on the graphite electrode in aqueous medium (pH 0.5, 8.0 and 12.0). The electrochemical behavior of formed films was studied by voltammetry cyclic and impedance. These analyses indicate that the preparation in acid medium favors the c…
Methods for piezoelectric characterization include the standard resonance test. At higher powers, however, the material’s inherent nonlinearity acts to significantly affect the expected resonance response. High-power resonance methods have previously been developed to describe piezoelectric nonlinearity. In this artic…
A silver complex is transformed into amphiphilic nanoparticles at room temperature using nanoreactors formed from an amphiphilic polyester. It takes a few minutes to form silver nanocolloids with a narrow particle size distribution. Developed silver forms a stable dispersion in both polar and nonpolar media. The amphi…
Glass exhibits many kinds of photoinduced phenomena, among which the giant photo-expansion appearing in chalcogenide glasses such as As2S3 may be the most dramatic and promising. Its feature, mechanism, and application including micro-lenses are described.
Structural, magnetic and theoretical studies show that the bimetallic pentalene complex, Mn(2)(C(8)H(4)(1,4-Si(i)Pr(3)))(2), contains both high and low spin Mn(ii) in two very different sites.
OBJECTIVE: The objective of this study was to demonstrate that severe mechanical processing of industrial aciniform aggregates results in some fracture of large aggregates and minimal liberation of "primary particles." METHODS: Carbon black and amorphous silica were subjected to uniaxial compression, mixing into rubbe…
In semicrystalline polymers, important toughening is obtained with dispersions of rubber particles. However, adding rubber most often induces a substantial loss in elastic modulus. In the present study, we investigate how to avoid such softening by using ABC triblock copolymers with low rubber content. A polyamide-12…
Advanced TiC∕a-C:H nanocomposite coatings have been produced via reactive deposition in a closed-field unbalanced magnetron sputtering system (Hauzer HTC-1000 or HTC 1200). In this paper, we report on the tribological behavior of TiC∕a-C:H nanocomposite coatings in which ultralow friction is tailored with superior wea…
A bentonita, composta predominantemente pelo argilomineral montmorilonita que lhe confere as propriedades físicas concentra a maior parte das reservas nacionais (62%) no Estado da Paraíba. A transformação da bentonita em argila organofílica consiste em um procedimento laboratorial simples e pode ser realizada através…
Subnanometric ZnO clusters confined in different micropore zeolites are studied by steady-state and nanosecond time-resolved photoluminescence (PL) spectroscopy. The microsecond-scale lifetime is observed at room temperature for ZnO clusters confined in zeolites, which is significantly different from that of macrocrys…
The time dependences after poling of the mechanical quality factor Q m , electromechanical coupling coefficient k 31 and dielectric constant K have been investigated for both “soft” and “hard” lead zirconate titanate (PZT) ceramics. A significant increase of Q m with time was observed for “hard” PZTs, however “soft” o…
The gelation kinetics of aqueous solutions of poly(vinyl alcohol) (PVA) during freezing at −13 °C has been investigated with time-resolved small angle neutron scattering. Crystallization of PVA takes place inside an unfrozen liquid microphase that forms in the matrix of ice crystals and follows a first-order kinetics…
Methanol can be reformed with water, at ambient temperature, using photocatalysis, and this reaction represents a possible low energy, more sustainable pathway to hydrogen production than (for instance) steam reforming. The requirements for the catalysts are rather strict since titania itself is almost inactive for an…
We have measured the second-order nonlinear optical susceptibilities of an SrB 4 O 7 crystal and have determined its electromechanical coupling coefficients, piezoelectric charge and voltage constants, and bulk acoustic wave velocities by a resonance method using high- Q resonators. In addition, the dielectric permitt…
The collagen is the most common protein in mammalians. Thus its interaction with small molecules and particularly amino acids is of interest. Owing to the high degree of order of collagen fibers in a tendon, the 1H-1H and 1H-13C dipolar interactions and the 2H quadrupolar interaction of small molecules interacting wit…
The microstructure evolution in copper electrodeposits at room temperature (self-annealing) was investigated by means of x-ray diffraction analysis and simultaneous measurements of the electrical resistivity as a function of time. In situ studies were started immediately after deposition of the various thick layers an…