Materials Literature
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A global algorithm for implementing the Gibbs tangent plane stability test in multicomponent, multiphase liquid mixtures is described. The algorithm is self-starting and significantly improves the reliability and robustness of multiphase equilibrium calculations. The main improvement is a result of a new approach for…
The effective pair interaction (potential of the mean force) between large hard spherical colloidal particles in a dispersion containing small hard sphere particles has been studied theoretically. We calculated the effective interaction from the total correlation function by solving the Ornstein−Zernike equation. For…
The surface of poly[ N, N‘ -(oxydiphenylene)pyromellitimide] film, Kapton, was modified by plasma graft polymerization of vinylimidazole to improve the adhesion with copper metal, and the surface of the modified Kapton film was investigated by means of XPS and atomic force microscopy. The plasma graft polymerization d…
Hydration dependent structural changes at the nanometer level were investigated in the natural wood cell of Picea abies. Using the technique of small-angle X-ray scattering (SAXS), it was possible to investigate the same specimens at different degrees of hydration, x, in a nondestructive way, which allowed us to separ…
Nd-Fe-B/Fe/Nd-Fe-B trilayers with individual layer thicknesses between 10 and 100 nm have been grown by sputter deposition. The aim of our study is to investigate remanence enhancement due to exchange coupling between the soft- and hard-magnetic layers as a function of the Fe-interlayer thickness d. It is shown that f…
SERS spectra of pyrazine on silver electrode have been recorded and analyzed, assuming a charge transfer effect and using selection rules analogous to those of resonance Raman. With the aim of predicting the effect of this mechanism on the selective enhancement of fundamentals, a method has been proposed based on an a…
Direct measurement of the depletion interaction between electrically charged surfaces has been obtained using the optical technique of total internal reflection microscopy (TIRM). The long-range interaction between a polystyrene sphere and a polished glass plate was measured in aqueous solutions of non-adsorbing collo…
Oligopeptide amphiphiles with different dipeptide moieties of −XYNH 2 (X = Gly and Ala, Y = Gly, Ala, Val, Leu, and Phe) were synthesized. Binding of aqueous dipeptides onto monolayers of equimolar mixtures of these amphiphiles with a benzoic acid amphiphile (2C 18 BCOOH) was investigated by π− A isotherm measurement,…
The frequencies of Si−O stretching, ν Si - O, in layers of montmorillonite and of H−O−H bending, ν 2, in the interlayer water were investigated by infrared spectroscopy. Oriented gels of Li- and Na-montmorillonite equilibrated at different water contents, m w / m c, were obtained by using a miniature pressure membrane…
In acetone and at subambient temperature, manganese complexes of 1,4,7-trimethyl-1,4,7-triazacyclononane-catalyse the selective oxidation of many alkenes and styrenes to epoxides with an efficient use of H2O2; the regio- and chemo-selectivity resemble those of manganese-porphyrin catalysts.
No abstract available.
Synthetic and X-ray structural details, optical and vibrational spectroscopic, and thermal properties of the materials [(CH 3 ) 4 N] 2 M 2 Ge 4 S 10 (where M = Cu, Ag), are described for the first time. Rietveld PXRD full-profile structure refinements of [(CH 3 ) 4 N] 2 M 2 Ge 4 S 10 reveal a novel open-framework arch…
The synthesis of carbon nanotubes filled with silver, gold, and gold chloride is described. The resulting materials have been studied by high-resolution electron microscopy, X-ray powder diffraction, and energy-dispersive spectroscopy (EDS). The EDS data were obtained using a high-resolution electron microscope equipp…
A parametric model has been developed to predict the performance of body armor systems under impact by a chunky steel projectile of arbitrary mass, shape, impact velocity, and impact obliquity. The model, which is based on a six-dimensional non linear regression analysis of extensive test data for Kevlar 29, is capabl…
Tissue engineering has recently attracted a great deal of attention for its potential in repairing, reconstructing, regenerating, or replacing tissues in damaged or diseased organs. A number of tissues and organs have already been investigated using this approach, including cartilage, liver, skin, bone, tendon, ureter…
Nanometer-sized silicon particles have been produced by ultrasonic dispersion of thin sections of porous silicon (PS) in organic solvents. The particles have been characterized by HRTEM (high-resolution transmission electron microscopy), FTIR (Fourier transform infrared) spectroscopy, and fluorescence spectroscopy. HR…
The temperature-programmed reduction of three Pd−Cu/KL-zeolite bimetallic catalysts has been studied using X-ray absorption near edge spectroscopy (XANES) and infrared spectroscopy with the probe molecule CO. We show that complete alloying with electronic perturbation of both components (with respect to their metallic…
We studied the molecular dynamics of vanadyl−chelate complexes covalently attached to the surface of cascade polymers, dendrimers. The rotational correlation times of the ion−chelate complex were determined from computer simulations of their EPR spectra. The chelate 2-(4-isothiocyanatobenzyl)-6-methyldiethylenetriamin…
ABSTRACT Edible films using wheat gluten as the structural matrix with or without different lipid components and pure lipid films were tested for sorbic acid retention properties. A diffusion mechanism following Fick's first law was identified. An experimental procedure was developed for determining the diffusivity co…
We study the slippage of a highly viscous polymer melt ( P monomers per chain) on a solid substrate grafted by a few smaller chains in the mushroom regime ( N monomers per chain, grafting density ν). The friction is provided by the sliding motion of the P chains of the “skin” (thickness R p = P 1/2 a ) which are entan…