Materials Literature
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An optimized interparticle potential has been developed for its use in computer molecular dynamics simulations of vitreous boron trioxide (v-${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$) which includes four-particle interactions. This is required to force the formation of planar six-membered (boroxol) rings in such simulation…
This paper embodies the belated publication of a thesis submitted by JJE to the Free University of Amsterdam in 1955; heretofore the data (heat of sublimation of cyclotetradecane, 21.34+/-0.10 kcal/mol or 89.33+/-0.42 kJ/mol; heat of sublimation of trans-stilbene, 20.68+/-0.08 kcal/mol or 86.57+/-0.33 kJ/mol) were ava…
Polyurethane (PU) surfaces were modified by coupling polyethylene glycol (PEG; molecular weight, 1,000) chains carrying different terminal groups (PU-PEG1K-OH, PU-PEG1K-NH2, PU-PEG1K-SO3) and longer PEG chains (MW, 3,350; PU-PEG3.4K-OH). The modified PU surfaces have the same PEG (1K) chain density. Surface induced pl…
Despite the globalization and internalization of competition and surplus of apparel production, high labour costs and other economic pressures, apparel products are still being produced using traditional methods and machinery, the mechanics of which have not fundamentally changed since the seventeenth century, even no…
A p-type oxide thin film, NiO, and an n-type thin film, ZnO, were fabricated by a liquid phase method using metal acetates as starting reagents. Both the films were transparent, uniform in thickness and porous. By repetition of coating of the n- and p-type films a p–n contact was formed. The contact exhibited nonlinea…
One-dimensionally periodic fivefold quasicrystals have been found in the AlCo-Ni system. They are characterized by a fivefold rotation axis as a unique symmetry element in selected-area electron diffraction (SAED) patterns which is consistent with contrast features in high-resolution transmission electron microscopy (…
Abstract A 50/50 (weight ratio (38/62 mole ratio referred to repeating units)) blend of poly(butylene terephthalate) (PBT) and polyarylate (PAr), was studied by means of thermal, solubility, X‐ray and nuclear magnetic resonance techniques after annealing procedures that enable transesterification. Prolonged thermal tr…
The second harmonic generation (SHG) parameters for metal‐containing ferroelectric liquid crystals are reported for the first time. Some of the materials, based on the structure shown in the Figure, exhibit reasonable NLO efficiencies despite the fact that the molecules themselves do not possess well‐defined donor–acc…
Gadolinium (Gd3+) is known to be the most paramagnetic ion but is also a very toxic cation often used in pharmacology as a putative stretch-activated channel inhibitor. Gadodiamide, a nonionic Gd3+ chelate, is frequently injected i.v. into magnetic resonance imaging (MRI) to enhance contrast. To determine whether this…
Abstract On the basis of measurements of bound rubber and physical properties and the results of Monsanto rheometer, dynamic mechanical and infrared spectroscopic studies, it is observed that strong rubber-filler interaction occurs between XNBR and precipitated silica filler. During molding, XNBR was found to be cross…
We have prepared stable colloidal suspensions in a lyotropic liquid crystal exhibiting an isotropic-nematic-lamellar phase sequence. Small angle neutron scattering (SANS) and dynamic light scattering (DLS) studies show the existence of attractive interparticle interactions in the nematic phase, which lead to a gas-liq…
A solution processible thiophene polymer with a hydrogen-bond-forming urethane group in the side chain, viz., poly[2-(3-thienyl)ethanol n-butoxycarbonylmethylurethane] (PURET), has been synthesized. The polymer is soluble in a wide variety of solvents such as chloroform, dimethylsulfoxide, N-methylpyrrolidone, and tri…
The introduction of hydrogen to AISI 430 stainless steel by electrochemical charging was studied. Tensile tests were employed to elucidate the mechanical behavior of the alloy responding to the effect of aging after cathodic charging ynamic charging, and interrupted charging. The fractography was investigated by scann…
In this paper, we focus on the magnetic abrasive process as a sizing process and present a theory which explains the out-of-roundness error phenomenon based on force analysis of the material removal mechanism. The theory is independent of the size and material of the workpiece and the design of the magnetic abrasive m…
Abstract A target fiber study using two garments purchased from two major UK clothing retail chains was carried out using cinema and car seats as potential recipient items. A total of 17 acrylic fibers matching one of the target garments and six cotton fibers matching the remaining target garment were found on the rec…
Abstract The β-crystal nucleating effect on polypropylene has been compared between γ-quinacridone and quinacridonequinone. While the β-crystal does not form at γ-quinacridone content below 1 ppm where red coloring is recognized on the molded article, much β-crystal forms even at quinacridonequinone content below 1 pp…
Des exprériences de calorimétrie haute résolution ont été réalisées pour déterminer les chaleurs spécifiques et les chaleurs latentes associées aux transitions de phase des homologues de la série crystal liquide nF2BTFO1M7: 3-fluoro-4[1-methyl-heptyloxy]4'-($4''$-alcoxy-$2'',$ $3''$-difluorobenzoyloxy)tolanes. Ces pro…
The objective of the present work was study of the behavior of active coatings of hydrophilic acrylic polymers bearing salicylic acid residues linked covalently to the macromolecular chains, after their application to woven and knitted Dacron vascular grafts. In vitro tests were carried out under dynamic flow conditio…
The dispersion of stress waves in pressure bars distorts a propagating stress pulse, and hence limits the accuracy with which dynamic stress can be measured. This dispersion is caused by a frequency dependence of phase velocity, and previous methods of dispersion correction have adjusted the phase shift of dispersed f…
Abstract The metal complexes ( E,E )‐[{diethyl 2,2′‐[1,2‐phenylenebis(iminomethylidyne)]bis[3‐oxobutanoato]}(2–)‐ N,N′,O 3 ,O 3′ ]manganese (Mn 1a ), [3,3′]‐[1,2‐phenylenebis(iminomethylidyne)bis(2,4‐pentanedionato)(2–)‐ N,N′,O 2 ,O 2′ ]manganese (Mn 1b ), and (Z,Z)‐[diethyl 3,3′‐(1,2‐phenylenediimino)bis(2‐cyano‐2‐pr…