Materials Literature
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Abstract Although most industrial drying and separation technologies are based on transport of multiple components, a convenient and practical means of describing multicomponent diffusion over wide temperature and concentration ranges has not been developed for polymer solutions or even for simple liquid mixtures. We…
Intumescent coatings are among the most efficient ways of fire retarding flammable materials. The coatings swell under the influence of heat and form a thick porous charred layer. The latter perfectly insulates the substrate against an excessive increase of temperature and oxygen access. In order to make intumescent c…
Condensation of 3,4-diethylpyrrole with 1,3-diformylindane in the presence of catalytic HBr afforded, following oxidation with FeCl3, the first example of a dicarbaporphyrin in moderate yield; this novel bridged annulene system retains a strong diamagnetic ring current in 1H NMR spectroscopy as well as a porphyrin-lik…
Electrochemical oxidation of p‐silicon of different crystal orientation and doping density has been investigated in fluoride containing nonaqueous solution of acetonitrile and dimethylformamide. The formation of a macroporous layer with macropore diameter and length in the micron range in acetonitrile is observed only…
Abstract The oxidation of dimethyl ether (DME) under flow reactor conditions has been studied experimentally and in terms of a detailed chemical kinetic model. The experiments were performed at atmospheric pressure in the temperature range 600–1500 K and at different air/fuel ratios. Of particular interest was the int…
The fact that only compounds 1a, 1b and 2a in the series 1– 3 show long-range 13C–19F coupling can be used to draw conclusions regarding the structures of these molecules.
This paper investigates the effect of nonsinusoidal voltage, i.e. voltage affected by the presence of harmonics, on intrinsic aging of cable and capacitor insulating materials, i.e. cross-linked polyethylene (XLPE) and polypropylene (PP). The results of life tests under sinusoidal and distorted voltage, the latter obt…
The effect of the simultaneous partial substitution of Co/sup 2+/ for Fe/sup 3+/ and of La/sup 3+/ for Sr/sup 2+/ ion in Sr ferrite on the magnetic properties of anisotropic Sr ferrite magnets was investigated. It was found that the coercive force of Sr ferrite magnets is increased without significant decrease in resi…
We present the design, fabrication, and test of a polarizing beam splitter grating for operation at 633 nm under a angle of incidence. This component is compact and its fabrication is reproducible enough to be integrated in optical reconfigurable interconnect systems. For TE polarization, the incident beam is undeflec…
Mercury (Hg) is one of the most toxic metals found in the environment. The purpose of this study was to investigate the performance of an innovative technology, self-assembled monolayers on mesoporous supports (SAMMS), in separating and immobilizing Hg from aqueous solutions. The high surface area of the mesoporous si…
Contents Adhesion to Wood 9--1 Surface Properties of Wood Adherends 9--2 Extractives on Surfaces 9--3 Knife- and Abrasive-Planed Surfaces 9--3 Veneer Surfaces 9--4 Surfaces of Wood and Nonwood Composite Products 9--5 Physical Properties of Wood Adherends 9--6 Density and Porosity 9--6 Moisture Content and Dimensional…
Reversible binding of hydrogencarbonate to a chiral di-aqua lanthanide complex occurs in the pH range 6.5–8.5, limiting the measured relaxivity in the gadolinium complex and enhancing the metal-based emission in the europium analogue.
Mesoporous silicas have been obtained by the true liquid crystal templating (TLCT) method, using a surfactant RuII complex as the template; on calcination, ruthenium-containing particles are deposited into the pores; the materials show high catalytic selectivity for the hydrogenation of hex-1-ene.
The modeling of heat transfer during combustion of the intumes cent formulation PP-APP/PER is studied. It is proposed a model based on the as sumption that it exits an intumescent front analogous to the phase change process which can describe the fire behavior of an intumescent material in condi tions of forced combus…
Carbamoyl phosphate synthetase catalyzes the formation of carbamoyl phosphate from one molecule of bicarbonate, two molecules of Mg2+ATP and one molecule of glutamine or ammonia depending upon the particular form of the enzyme under investigation. As isolated from Escherichia coli, the enzyme is an alpha,beta-heterodi…
The excited state of polyoxometalates, (POM) arising from absorption of light at the O→M charge transfer (CT) band (near-VIS and UV light), is a powerful oxidizing reagent. The oxidizing ability is manifested, mainly, through formation of OH radicals arising from the reaction of the excited POM with adsorbed water. Th…
Analytic expressions for the eigenvalues for the four-wave components at an oblique angle of light incidence inside a randomly oriented anisotropic magneto-optic dielectric medium are reported explicitly. In particular, these solutions are valid as long as the dielectric function tensor consists of a symmetric and an…
Rat hepatocytes were cultured onto the surface of various amorphous biodegradable polymers composed of lactic acid and glycolic acid which were partially surface hydrolyzed by treating with sodium hydroxide. The polymer surface progressively became more hydrophilic with increasing NaOH treatment time, which was confir…
The preparation of ethylenedithiotetrathiafulvalenes (EDT-TTF) directly functionalized on the TTF core with a primary, secondary or tertiary amide or an hydrazide functional group is described. The X-ray crystal structures of EDT-TTF-CO 2 H, EDT-TTF-CONH 2 , EDT-TTF-CONHMe and EDT-TTF-CONMe 2 are reported. The solid s…
Neutron powder diffraction has been used to examine the crystal structure of the perovskite , at room temperature, and then at elevated temperatures to 1673 K. The orthorhombic structure at room temperature ( Pbnm , a = 5.5245(1) Å, b = 5.4922(1) Å, c = 7.7740(2) Å) was confirmed. At temperatures from about 420 K the…