Materials Literature
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Abstract Monte Carlo (MC) simulations of molecular structure in the interlayers of 2:1 Na-saturated clay minerals were performed to address several important simulation methodological issues. Investigation was focused on monolayer hydrates of the clay minerals because these systems provide a severe test of the quality…
A new family of high‐temperature, oxidation‐resistant, ceramic composites, with (La)‐monazite (LaPO 4 ) serving as a weakly bonded interphase, is proposed. Monazite is stable and phase‐compatible with alumina at temperatures at least as high as 1750°C in air. Especially important for use in high‐toughness composites,…
The amorphous compound MoS3 has been investigated by monochromatic X-ray photoemission ( X P S) and vibrational spectroscopy, as well as by chemical extrusion aimed at identifying structural units inside MoS3. XPS shows that all molybdenum in MoS3 occurs in the 4-t oxidation state, while sulfur is present in at least…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Processing of Improved Organic Second-Order Nonlinear Optical Materials for Applications in PhotonicsL. R. Dalton, A. W. Harper, R. Ghosn, W. H. Steier, M. Ziari, H. Fetterman, Y. Shi, R. V. Mustacich, A. K.-Y. Jen, and K. J. SheaCite this: Chem. Mater. 1995, 7…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDrainage of a Thin Liquid Film Confined between Hydrophobic SurfacesOlga I. VinogradovaCite this: Langmuir 1995, 11, 6, 2213–2220Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June 1995https://pubs.acs.org/doi/10.1021/l…
The review gives a systematic account of the results of detailed studies of the vibrational spectra of a series of industrial amorphous highly disperse silicas (aerosil, silica gel, aerogel) with the aid of inelastic neutron scattering. The observed phenomenon of technological polymorphism and the results of the quant…
Abstract A method for real‐time nondestructive monitoring of small molecules diffusion in polymeric films was developed. The method was based on detection of a fluorescent tracer eluting from the investigated polymer film into the solution in which this film was immersed. The kinetics of the tracer elution, monitored…
Abstract Polyethylene–kaolin composites were investigated with a special emphasis on the control of the interfacial adhesion. Both matrix and filler were modified for this purpose. A stearic acid and maleic anhydride‐grafted polyethylene were used as potential interfacial agents and the efficiency of aminosilane‐surfa…
Abstract The selective dynamic crosslinking reaction by means of the N , N '‐ m ‐phenylene–bismaleimide/poly‐(2,2,4‐trimethyl‐1,2‐dihydroquinoline) system was carried out on PP/EPDM blends and its effect on the Izod impact strength (IIS) was investigated. Three series of PP/EPDM combinations were adopted to establish…
The review surveys data on the known structures of polyoxometalates. The changes in this field which have occurred in the last ten years are traced. Heteropolyacids are considered in detail as a special case of polyoxometalates: their composition and structure, methods of synthesis, stability, and acidity. The bibliog…
First-principles calculations based on density functional theory (DFT) and the pseudopotential method have been used to study the stoichiometric and reduced SnO2 (110) surface. The ionic relaxations are found to be moderate for both the stoichiometric and reduced surfaces, and are very similar to those found in recent…
In a recent PRL, Gonze et al claim that the density functional theory in Hohenberg-Kohn formulation is not valid for crystalline solids in a homogenious electric field. They introduce another theory, density-and-polarization functional theory, which has to substitute the DFT in the calculations of the long-wave dielec…
The low-temperature specific heat for non-magnetic Mg 42 Y 8 Zn 50 quasicrystal has been investigated to get information on the electronic structure. The electronic specific heat coefficient gamma is estimated to be 0.63 mJ mol -1 K -2 , which is about 70% of the value expected from the free-electron model. This small…
A method is presented to calculate ab initio exchange constants and spin-wave excitations of multi-sublattice magnetic structures on the basis of total-energy calculations of incommensurate magnetic structures. Here the exchange energies, dispersion curves and Curie temperature for magnetite (Fe 3 O 4 ) are obtained a…
Far-infrared transmittance and reflectance of PbTiO 3 , PbZr 0.53 Ti 0.47 O 3 and PbZr 0.75 Ti 0.25 O 3 thin films deposited by a sol-gel technique on sapphire substrates were measured between room temperature and 650 degrees C. The spectra were fitted with a classical oscillator model to calculate the dielectric resp…
Persistent spectra hole burning is observed at room temperature in the excitation spectrum for the 7F0→5D0 transition of the Sm2+ ions that are doped in aluminosilicate glass. Glass having the composition of Sm2+-doped Al2O3⋅9SiO2 has been prepared by the sol-gel processing of metal alkoxides and the reaction with H2…
A nanometer-scale recording technique has been demonstrated on an amorphous GeSb2Te4 film with an atomic force microscope (AFM). Data are recorded by locally changing the electrical property of the film with a conductive AFM probe. The conductance of the film is able to be increased more than one hundred times by appl…
A high quantum efficiency for a porous silicon light emitting diode (LED) is demonstrated under pulsed operation. The LED is fabricated from a p+nn+ structure by anodic/hydrofluoric etching followed by deposition of a transparent gold contact. The LED shows a rectifying behavior and emits orange-red light under forwar…
We report electrical impedance measurements of polymer light-emitting diodes employing the soluble, conjugated polymer poly[2-methoxy, 5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) as the light-emitting layer. The diode structures were metal-polymer-metal structures utilizing thin gold as the transparent, po…
Doxorubicin entrapped within conventional liposomes (200 nm in diameter; lip-Dox) has major toxic effects on liver macrophages of the rat for a considerable period of time following i.v. administration, with respect to both specific phagocytic capacity and cell numbers. At different time-points after injection of lip-…