Materials Literature
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It is very important for a spinner to be able to predict the degree of spinnability of a given fibre quality. Certain process conditions must be taken into account here. This paper describes how the spinnability or a given fibre quality on a rotor and ring spinning machine can be predicted with a reliability of 95% by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBond Strength Trends in Halogenated Methanols: Evidence for Negative Hyperconjugation?William F. Schneider, Barbara I. Nance, and Timothy J. WallingtonCite this: J. Am. Chem. Soc. 1995, 117, 1, 478–485Publication Date (Print):January 1, 1995Publication History Published onli…
Thermodynamic parameters of melting for mono- and di-substituted benzenes and naphthalenes have been examined. Correlations with molecular structural parameters are discussed. With very few exceptions, ortho- and meta-disubstituted benzenes melt at lower temperatures than para-isomers, an enthalpic effect related to c…
With the introduction of artificial implant devices, a new host of biomembrane-like structures have been introduced into the bio-media made up of the synthetic matrix, adsorbed proteins and lipids. Lysosomal hydrolases, e.g. cholesterol esterase (CE), are implicated during the tissue response near the tissue-implant i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal Synthesis of (Ph4P)2[Hg2As4S9] and (Me4N)[HgAs3S6]. Extended Chains and Layers Based on the Condensation of [AsS3]3- UnitsJun-Hong Chou and Mercouri G. KanatzidisCite this: Chem. Mater. 1995, 7, 1, 5–8Publication Date (Print):January 1, 1995Publication History P…
The application of Preisach modelling to the study of the microstructure-hysteresis interplay in soft magnetic materials is reviewed. It is shown that mean-field effects are mainly due to the change of the total domain wall surface energy along the hysteresis loop. The reconstruction of the Preisach distribution from…
The pyrolytic evolution of poly(N‐methylsilazane), –[H 2 SiN‐Me] x –, from preceramic polymer to ceramic product is followed by heating samples of the partially cross‐linked polymer, in 200°C increments, from ambient temperature to 1400°C. The intermediate products are characterized by chemical analysis, diffuse refle…
The refractive indices, optical anisotropies, polarisabilities and order parameters of a number of phenylthiophenes and the parent dithienyl and biphenyl compounds with butylsulfanyl and cyano substituents have been measured. The presence of a thiophene ring leads to: (i) increased values of n∥ and n⊥ with the latter…
The reaction of barium glass filler with water was determined by investigation of the effects of the particle size of barium glass filler on the water sorption rate and the mechanical properties of composite resin. Barium glass and quartz were milled to obtain powders with different average particle sizes. These powde…
The new trinuclear heteropolyperoxo complexes [NMe4]2[(RPO3){MO(O2)2}2{MO(O2)2(H2O)}](R = Ph, M = Mo 1 or W 2) have been isolated and the crystal structure of the molybdenum complex is reported. A series of analogous molybdenum complexes (R = Me, Et, Bun or But; M = Mo) have also been synthesised and characterised. Th…
Abstract The frequency dependence of the real and imaginary parts of the complex dielectric constant ϵ(ω) in compounds XMnY (X = Ni, Pd, Pt, Cu; Y = Sb, Sn) having Cl b structure are investigated in the spectral range ħω = 0.05 to 8 eV. The values of conduction electron plasma and relaxation frequencies ω p and γ, res…
Ultraflne titanium dioxide powder was synthesized by the gas-phase oxidation of titanium tetrachloride in a multistage aerosol reactor. The reactor consisted of three zones: an evaporation zone for TiCl4, a preheating zone for oxygen and vaporized titanium tetrachloride, and a reaction zone. Preheating temperature of…
A strategy is set out for the design and synthesis of a series of cyclic porphyrin oligomers which should be able to bind two or more substrate molecules, catalyse a reaction between them and release the product(s). Exploratory syntheses and some spectroscopic properties of butadiyne-linked cyclic dimer, trimer and te…
The interactions of hydrogen with palladium–ceria catalysts have been studied by volumetric and magnetic susceptibility measurements. The ratio Hirr : Pdtotal, where Hirr stands for irreversibly adsorbed hydrogen, lies in the range 2.5–3.5; this result is ascribed to hydrogen spillover from palladium to ceria. The upt…
The X-ray crystal structure of a [2]catenane is reported; the two cycles which comprise the link are related by crystallographic symmetry, so only when a packing diagram is generated is the interlocked structure revealed.
Contact angle, electrokinetic, and X-ray photoelectron spectroscopic (XPS) measurements have been used to study the surface properties of flame- and oxygen plasma-pretreated polypropylene/ ethylenepropylene-diene monomer rubber (PP-EPDM) blends and of ethylene vinyl acetate (EVA) copolymers grafted with carboxyl group…
The rate of butane isomerization at low temperature is more than two orders of magnitude greater over sulfated zirconia with iron and manganese than over unpromoted sulfated zirconia. Therefore, the bulk and surface structures of the unpromoted and promoted catalysts have been investigated using X-ray absorption spect…
Diamond photoconducting detectors (PCDs) are one of the primary x-ray diagnostics for z-pinch experiments at Sandia National Laboratories’ Saturn facility. Diamond PCDs represent a significant advance in the state of the art for electrical x-ray detectors because of their stability of response, overall flatness of res…
Abstract Polymethacrylates with laterally attached azobenzenes were prepared to cause molecular reorientation of this chromophore in their thin films by linearly polarized irradiation with an exposure energy of less than ca. 100 mJ/cm 2 . A homogeneous alignment was induced by assembling a nematic liquid crystal cell…
Magnetohydrodynamic flows play an important role in the design of liquid-metal fusion reactor blankets. The interaction of the plasma-confining strong magnetic field and the electrically conducting coolant and breeding material may cause high pressure drop and unusual flow structures compared with hydrodynamic flows.…