Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHybrid Inorganic-Organic Materials by Sol-Gel Processing of Organofunctional Metal AlkoxidesUlrich Schubert, Nicola Huesing, and Anne LorenzCite this: Chem. Mater. 1995, 7, 11, 2010–2027Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSize Effects on the Photophysical Properties of Colloidal Anatase TiO2 Particles: Size Quantization versus Direct Transitions in This Indirect Semiconductor?N. Serpone, D. Lawless, and R. KhairutdinovCite this: J. Phys. Chem. 1995, 99, 45, 16646–16654Publication Date (Print)…
The exact analytic method of evaluating the absorption during scattering in multifaceted convex crystals is developed in a way that permits efficient computation. A fast and accurate algorithm is given for finding the Howells polyhedra whose determination is fundamental to the analytic method. The algorithm allows for…
Recent experiments performed at high pressures indicate that ruthenium can support unusually high concentrations of oxygen at the surface. To investigate the structure and stability of high coverage oxygen structures, we performed density functional theory calculations, within the generalized gradient approximation, f…
The ground-state properties of Fe, Co, and Ni are studied with the linear-augmented-plane-wave (LAPW) method and norm-conserving pseudopotentials. The calculated lattice constant, bulk modulus, and magnetic moment with both the local-spin-density approximation (LSDA) and the generalized gradient approximation (GGA) ar…
An improved energy level diagram for Tm 3+ (4f 12 ) ions in dodecahedral (D 2 symmetry) sites in Y 3 Al 5 O 12 (YAG) has been obtained from experimental absorption and emission spectra. Interferences in line assignment from the spectra of minority perturbed Tm 3+ centres or due to electron-phonon interaction are discu…
The electronic motion in quasiperiodic systems (the Harper model, the Fibonacci chain, two- and three-dimensional Fibonacci quasilattices) is studied, in the framework of a tight-binding Hamiltonian. The spreading with time of the wavepacket is described in terms of the behaviour of the autocorrelation function C(t).…
We report the growth and characterization of crystalline, single-phase zinc blende MnS (i.e., β-MnS). The material was grown on ZnSe buffer layers on (100) GaAs substrates, using solid-source molecular beam epitaxy and a novel valved S cracker with deposition at low (∼110 °C) substrate temperatures. Characterization b…
Eu 3+ luminescence is of special importance as a spectral probe apart from its application in phosphor materials. This is possible for the reason that Eu 3+ has several structure-dependent transitions enabling one to gain insight about the site that it occupies in a given host. On this basis we have attempted to explo…
The possible occurrence of either a charge-density-wave or a Kohn anomaly is governed by the presence of Fermi-surface nesting and the subtle interaction of electrons and phonons. Recent experimental and theoretical investigations suggest such an effect for the hydrogen covered Mo and W(110) surfaces. Using density-fu…
A structure for an electro-optically controlled liquid crystal diffraction grating is proposed, which can dramatically simplify the fabrication process of liquid crystal optical gratings. The structure consists of two alternating stripes. Each stripe is a hybrid liquid crystal cell with adjacent stripes oriented perpe…
Free-standing powder of zinc sulphide quantum particles has been synthesized using a chemical route. X-ray diffraction analysis shows that the diameter of the particles is ∼21±2 Å which is smaller than the Bohr exciton diameter for zinc sulphide. UV absorption shows an excitonic peak centered at ∼300 nm corresponding…
The complete phase diagram of a ``colossal'' magnetoresistance material ( ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$) was obtained for the first time through magnetization and resistivity measurements over a broad range of temperatures and concentrations. Near $x\phantom{\rule{0ex}{0ex}}=\ph…
Formation of aluminosilicate minerals in marine sediments was proposed over 30 years ago as a potentially important control on the chemistry of the oceans. Until now, this reverse weathering process has been largely discounted because of insufficient direct evidence for its existence. Experiments with unaltered, anoxi…
A general class of exact solutions is presented for a time-evolving bubble in a two-dimensional slow viscous flow in the presence of surface tension. These solutions can describe a bubble in a linear shear flow as well as an expanding or contracting bubble in an otherwise quiescent flow. In the case of expanding bubbl…
In this paper we briefly review a model that describes the diffusion-controlled aggregation exhibited by particles as they are deposited on a surface. This model allows to understand many experiments of thin film deposition. In the first part, we describe the model, which incorporates deposition, particle and cluster…
Abstract The copolymers poly(propylene‐ co ‐ethylene) (PP/E) and poly(ethylene‐ co ‐vinyl acetate) (EVA) and blends of these were modified to develop an artificial matrix which promotes the growth of endothelial cells. Covalent immobilization of amino acids or sequences of adhesion glycoproteins should trigger the for…
Abstract Monsanto rheometric, dynamic mechanical, and solvent swelling studies indicate that functional groups of oxidized carbon black chemically react with carboxylated nitrile rubber (XNBR) when heated at high temperature for prolonged time. The reinforcing ability of the surface oxidized carbon black, measured by…
Abstract Coir fibers were chemically modified through alkali treatment, and crosslinking with formaldehyde, para ‐phenylene diamine, phthalic anhydride, and combined crosslinking‐cyanoethylation reactions in appropriate solvent and catalyst. The parent and chemically modified coir were characterized by FTIR spectra. T…
Abstract Photodegradation of incombustible polymer materials [high‐density (HD) and low‐density (LD) polyethylene (PE) containing 0.5 to 2.0 phr of decabromodiphenyl ether (DBDE) or tetrabromobisphenol A (TBA) as a flame retardant] were studied using an Okazaki Large Spectrograph (OLS). Samples were irradiated in air…