Materials Literature
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The formation of amorphous ${\mathrm{LiBO}}_{2}$, as well as its particle size and phase-transition mechanism, have been investigated by means of thermal analysis, transmission electronic microscopy (TEM), and high-temperature and normal-temperature x-ray-diffraction analyses. \ensuremath{\zeta}, \ensuremath{\eta}, an…
Summary A problem of elastic structures stress-strain field determination is considered in this article. A theoretical background and computation algorithms of equilibrium finite element method are presented there. The different external effects are estimated, namely: load, prestressing, inicial strains and support se…
Synthetic zircon crystals (ZrSiO4), undoped and doped with Y3+, La3+, Ce3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Tb3+, Dy3+, Ho3+, Er3+, Tm3+, Yb3+, Lu3+, were grown from a flux consisting of a mixture of Li2MoO4 and MoO3 heated to 1125°C and then cooled to 750°C. The cathodoluminescence (CL) spectra of these zircons were an…
Aluminium hydroxide (Al(OH) 3 ) has been treated with a range of surface modifiers including a dicarboxylic acid anhydride (DAA), a silane based system and a maleanised polybutadiene (MPBD). Polypropylene (PP) based composites were produced by twin screw extrusion and their mechanical properties evaluated. At filler l…
Metal-ceramic microstructures were obtained by partial reduction of the spinel compound NiAl2O4. Electron microscopy studies were performed for microstructural characterization, phase identification and chemical analysis. Depending on the reduction temperature, two different morphologies of nearly pure Ni particles, e…
A novel method for the synthesis of silicon-substituted aluminophosphate VPI-5 with enhanced acid catalytic activity is described.
Diatoms are golden brown algae (class Bacillariophyceae) whose cellular contents are enclosed between two valves or shells of silica. They are classified into groups with radial symmetry (centric diatoms) and axial symmetry (pennate diatoms). The latter are subdivided as raphid and araphid diatoms according to the pre…
The effects of microstructure on the micromagnetic Barkhausen signal emissions in AISI 4140 steel are reported. The Barkhausen signal amplitude is known to be highly sensitive to the type and distribution of microstructural inhomogeneities, such as grain boundaries, precipitates and dislocations. The Barkhausen measur…
Abstract A new photochromic nitroindolinospiropyran with a 3,1′-trimethylene bridge was synthesized. Different from the non-bridged spiropyrans it exists mainly as the colored twitter-ionic open form in polar solvents. The following values in CHCl3, DMSO, and CH3OH at 20 °C were determined: (1) molar absorption coeffi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical and Spectroscopic Studies of the Nucleation and Growth of Copper Thin Films on Polyimide Surfaces by Chemical Vapor DepositionNoo Li Jeon and Ralph G. NuzzoCite this: Langmuir 1995, 11, 1, 341–355Publication Date (Print):January 1, 1995Publication History Published…
The electronic structure of glassy B2S3 has been investigated using X-ray photoelectron spectroscopy and the B 1s and S 2p binding energies of this very hygroscopic material have been unambiguously determined. In addition to the experimental analysis of the core and valence spectra, theoretical models have been used (…
The stressed crystal that has been obtained during the crystallization process is considered with particular attention given to the comparative numerical analysis of composition and temperature gradients as the causes of the stressed state. The numerical calculations are referred to the directional solidification meth…
Some new frictional parameters of fabrics determined by the trace analysis of their stick-slip friction property is reported. Both scouring and mercerization processes induce structural consolidation which in turn can increase the frictional resistance, number, amplitudes of the stick-slip, and the differential fricti…
In the analysis of corrosion behaviors of metals in oil & gas well and chemical plants containing CO2 and/or H2S gas, detailed knowledge of a stable corrosion product and its solubility is essential. Thus, a computer program has been developed that can automatically construct the potential-pH diagram and calculate the…
Synthesis, characterization, and liquid crystal (LC) aligning capability of polyimide (PI) for the active matrix (AM) liquid crystal display (LCD) application are demonstrated and discussed. The synthesized PI materials in this research are featured by: 1) a low curing temperature below 200°C due to their organic-solv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHosloppin, a New Pyrone-Substituted Flavonoid from Hoslundia oppositaBonaventure T. Ngadjui, Apollinaire Tsopmo, Johnson F. Ayafor, Joseph D. Connolly, and Hélène TamboueCite this: J. Nat. Prod. 1995, 58, 1, 109–111Publication Date (Print):January 1, 1995Publication History…
Copper tubes suffer from severe localized attack during storage after rinse and de-greasing process in organochlorine solvents. This type of corrosion is triggered by condensed organic acid vapor, e.g. acetic and formic acids that are decomposition products of the solvents used for rinsing and de-greasing of copper tu…
The radical scavenging effects and anticorrosive properties of polyphenols (gallic acid [GA] and two gallotannins) that contained ortho-trihydroxyl aromatic rings but different numbers of GA moieties and different molecular masses were studied. Scavenging of the 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) by the poly…
Abstract Here we study the dynamics and the conformational properties of Rouse polymers in random layered flows. We obtain explicit expressions for the mean squared displacement of the center of mass of the polymer as a function of time and number of beads. The averages involve both the thermal noise and the realizati…
Platinum is a non-inert material which reacts with oxides when in contact at high temperatures. The degree of such reactions depends strongly on the oxygen partial pressures established in the environment of the Pt-oxide reaction couple. If the oxygen partial pressure is decreased, oxygen is released due to (i) the di…