Materials Literature
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Novel gold nanoparticles, passivated by monolayers of benzenethiol, biphenylthiol, and similar derivatives, have been synthesized and characterized using UV/vis, NMR, and Fourier transform infrared (FTIR) spectroscopies. The nanoparticle sizes have been evaluated using transmission electron microscopy and UV/vis spect…
A new class of linear unsaturated polyarylphosphate esters based on dibenzylidene cyclopentanone, possessing liquid crystalline‐cum‐photocrosslinkable properties has been synthesized from 2,5‐bis(m‐hydroxyalkyloxybenzylidene)cyclopentanone (m = 6,8,10) with various aryl phosphorodichloridates (aryl = phenyl, naphthyl,…
In situ and ex‐situ atomic force microscopy (AFM) studies of annealing of solution‐grown single crystals of polyethylene (PE) on graphite were performed at temperatures up to 170°C. Structural changes of the crystals began at ∼90°C at the interface between the lamellar crystal and the substrate where solvent traces ar…
The effect of initial synthesis solution pH and tetramethylammonium silicate concentration in the synthesis solution on the physical and chemical properties of MCM-41 was systematically investigated using N(2) physisorption, X-ray diffraction, temperature-programmed reduction, in situ Fourier transform IR, UV-vis, and…
The corrosion behaviour of Nd–Fe–B, a permanent magnetic alloy, has been studied in two different solutions chosen to simulate the effects of marine and industrial environments. The results showed that the corrosion rate of the alloy was about nine times higher in the simulated industrial (sulphate) environment when c…
Abstract Cellular biological materials have intricate interior structures, self‐organised in hierarchies to produce modularity, redundancy and differentiation. As Michael Weinstock explains, the foam geometries of cellular materials offer open and ductile structural systems that are strong and permeable, making them a…
Este trabalho avalia a viabilidade técnica da obtenção de compósitos lignocelulósicos de PVC, utilizando-se resíduo de Pinus elliottii e Pinus taeda como carga reforçativa. Foi desenvolvido um processo simples e economicamente viável de tratamento de resíduos industriais desta madeira, processo este baseado na secagem…
The nonempirical density-functional tight-binding approach to band structure calculations was used to study the structural and electronic properties of new boron nitride graphyne-like nanotubes (α-BN-NT) constructed on the basis of the atomic motif of α-graphyne. All α-BN tubes were semiconductors with gap widths of 3…
Abstract Single crystals of bulk ZnO containing up to about 3% of Mn or Co were grown by chemical vapour transport method and characterized by Raman scattering. By comparison with Raman data taken on pure ZnO samples, a few new structures were observed in the spectra of the doped crystals. The determined frequencies o…
Bulk Cu with high strength and appreciable tensile ductility has been developed by refining the grain size down to nanocrystalline/ultrafine‐range by appropriate combination of conventional rolling at cryogenic condition and controlled recrystallization. The grain size has been estimated at different stages of deforma…
A series of melt blown samples were produced from three hardness grades of ether based thermoplastic polyurethane elastomers (TPU). The fabrics were tested to investigate their structure-property relationship in a melt blown process. Solution viscosities of the web were only 20–26% of there original values indicating…
The effect of uniaxial orientational drawing and isometric annealing on the ratio of polymorphic modifications in the crystalline phase of poly(vinylidene fluoride) is studied. The role of drawing temperature and draw ratio in the structural rearrangements during polymer deformation is analyzed. The conditions providi…
A novel ceramic-metal composite with continuous interconnected ceramic and metal phases has been fabricated from sintered porous particulate AlN preforms infiltrated with magnesium. The 48 vol. % AlN composites are fabricated by pressureless infiltration in argon in the temperature range of 870 °C to 960 °C. An increa…
Abstract In this work we investigated ZnO films grown on semi‐insulating (100) GaAs substrates by pulsed laser deposition. Samples were studied using techniques including X‐ray diffraction (XRD), scanning electron microscopy, atomic force microscopy, Raman spectroscopy, temperature dependent photoluminescence, C‐V pro…
Clothin g protec ts from cold or heat to ma in ta in body thermal comron throu ghout th e full range of human activit ies. Var ious typ es of tac tile . moisture and thermal interac tion s be tween the clothing ma te rial and the human skin determine th e comfo rt leve l of a perso n at a given enviro nm enta l condi…
ABSTRACT In dry‐grind processing to produce ethanol from corn, unfermented solids are removed from ethanol by distillation and dried to produce distillers dried grains with solubles (DDGS), an animal food. Fouling of thin stillage evaporators has been identified as an important energy consumption issue in dry‐grind fa…
In this work, Ag–SiO2 nanocomposite layers were synthesized by introducing Ag nanoclusters into thermally oxidized SiO2 layers, using ion implantation. The field-emission (FE) properties of these layers were studied and correlated with the results from atomic force microscopy and transmission electron microscopy measu…
The final morphology of liquid metallic emulsions, produced in a temperature gradient, depends on the interfacial gradient force acting on small metallic droplets. This force is proportional to the temperature coefficient of the interfacial energy between the two immiscible liquid phases. In the present paper first a…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Bulk ceramic samples of (La 0.7 Sr 0.3 )(Mn 1 − x Cu x )O 3 ± δ manganites are prepared by solid-state reactions. The unit-cell parameters and Mn-O bond distances in the manganites are determined using the Rietveld profile analysis method, and their magnetic properties are studied with the use of ferromagnetic resonan…