Materials Literature
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Abstract UHMPE fibers can display several morphological features, including skin‐core, microfibrillar and shish‐kebab structures. In this work, an attempt was made to eliminate these morphologies by treating the UHMPE in a two‐roll mill, at temperatures ranging from ambient to 145°C. Up to 130°C the tensile strength a…
Aromatic phosphites drive two kinds of condensation reactions: amidation and esterification. The amideforming reactions are far more efficient, lending themselves to polymerization as well as chain extension. The ester-forming reactions are significantly more sluggish, limiting their usefulness to the extension, graft…
Uniform submicrometer particles of calcium titanium peroxo‐hydroxide were prepared by adding calcium salts to the solution of peroxotitaniun. species chelated with nitrilotriacetic acid (NTA). Similarly, corresponding leadniobium compodnd of [Pb]/[Nb] = 0.75 was obtained by introducing lead salts into the solution of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpreading of a Drop between a Solid and a Viscous PolymerF. Brochard-Wyart and P. G. de GennesCite this: Langmuir 1994, 10, 7, 2440–2443Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July 1994https://pubs.acs.org/doi/10…
"Plain" and a "fancy" yarns were produced using a range of spinning speeds on a hollow spindle machine. The yarns were assessed for different characteristics using both subjective and objective tests, and the results obtained with the different techniques show good agreement. Clearly, there is a progressive change in…
Abstract Electrochemical investigations (polarization curves, polarization resistance measurements), together with weight loss measurements and quantitative chemical analysis of the solutions after immersion of samples were used to evaluate the corrosion behaviour of type 304L and 316L sintered austenitic stainless st…
Vector impedance measurements of radial modes of thin disks (diameter 13 mm and thickness 1 mm) of Pb(Zr0.515Ti0.485)O3 doped with Cr2O3 have been carried out using an impedance analyzer. Piezoelectric equivalent circuit parameters R, L, Ca in series, and Cb in parallel have been measured by simulating ‖Z‖ and θ plots…
Two populations of aggregates are generally indentified in supersaturated solutions of biological macromolecules: small aggregates of a size which is less than 5 nm and large aggregates, the largest of which are at least one order of magnitude bigger. In order to understand the role played by the microporous network o…
The fatigue behavior of a silicon carbide fiber reinforced glass ceramic matrix composite, SiC/CAS subjected to tension-compression cycling was investigated. Two laminate layups were studied: cross-ply, [0/90] 25 and unidirectional, [0] 16 . At first, the fatigue limit based on one million cycles was established for a…
The authors have found a write once read many (WORM) type new optical recording medium of an Ni–NiO heterogeneous system thin film. The structure of the recording medium is a single layer Ni–NiO heterogeneous thin film on a transparent resin substrate. Irradiation of a converged laser diode beam causes a volume expans…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSulfide bond formation for the synthesis of poly(thioarylene) through oxidation of sulfur chloride with aromaticsKimihisa Yamamoto, Mitsutoshi Jikei, Kenji Miyatake, Junya Katoh, Hiroyuki Nishide, and Eishun TsuchidaCite this: Macromolecules 1994, 27, 15, 4312–4317Publicatio…
The AC-behavior of a hydrophilic and a hydrophobic porcelain post insulator is studied during four different rain conditions by measuring the electric field distribution, resistive and capacitive leakage currents and UV-photography of the discharge activity. The results are in agreement with each other and show resist…
Electrodeposited tungsten trioxide films show fast electrochromic response both in aqueous and in nonaqueous solutions. The values of in the tungsten bronzes, , were determined by using a chronopotentiometric technique combined with UV/Vis spectroscopic analysis. The effect of double‐layer charging was discussed. A fi…
Scanning electron microscopy, atomic force microscopy, and Raman spectroscopy were used to characterize the microstructure of photoluminescent porous silicon (PS) layers formed by the anodic etching (HF:H2O:ethanol), at various current densities, of p-type (100) silicon wafers possessing resistivity in the range 1–2 Ω…
Abstract Mit CO 2 ‐LASER‐Technik wurden bei Temperaturen oberhalb 3 000°C Einkristalle einer Hochtemperaturform von TiO (HTiO) dargestellt. Sie kristallisieren mit einer an Oxiden des zweiwertigen Titans bisher nicht beobachteten Kristallstruktur, isotyp zu Wolframcarbid, mit Ti 2+ in trigonal prismatischer Sauerstof…
We present our model for transport and deposition in features for situations in which intermolecular collisions dominate the species transport. Species transport in this ‘‘low’’-Knudsen-number regime is modeled using continuum diffusion. Our model allows both homogeneous reactions and heterogeneous (surface) reactions…
We present linearized augmented-plane-wave calculations for FeCu fcc and bcc metastable phases using the local-density approximation (LDA) as well as the local-spin-density approximation (LSDA). The nonpolarized density of states calculated within the framework of LDA together with the reformulated Stoner theory provi…
Abstract An experimental and numerical analysis of tension tests in the Hopkinson bar is made to assess the suitability of this method to characterize materials in tensile conditions at strain rates about 1000/s. The stress and strain fields that appear in the specimen are analyzed by the finite element method. This m…
Novel AlN‐based ceramic matrix composites were produced using a two‐step infiltration and reaction process. Molten Al alloy was infiltrated without pressure into preforms containing Si 3 N 4 particles (mixed α and β phases). The resultant composites were heat‐treated, causing hard phases (AlN and Si) to form by reacti…
Liquid crystals containing “open” analogues of the mesomorphic amide 1,4,7‐triazacyclononane, i.e., 3,4‐bis(alkoxy)‐ benzoyl substituted diethylenetriamine, are reported, showing that the closed‐ring structure of the central core is not essential for mesomorphism in these compounds. The Figure shows the pronounced pse…