Materials Literature
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A simple bend stress relaxation (BSR) test has been developed to measure the creep‐related deformation properties of ceramic fibers and whiskers. The test was applied to a variety of commercial and developmental Si‐based fibers to demonstrate test capabilities and to qualitatively evaluate the relative creep resistanc…
Electron localization and optical transmission in one-dimensional systems with two components distributed according to the Rudin-Shapiro sequence are investigated. The nature of the eigenstates in the diagonal tight-binding model is studied by making use of nonlinear recurrence relations satisfied by the associated tr…
Free‐end torsion tests were carried out on polycrystalline copper samples at room temperature, 125°C, 200°C and 300°C. The lengths of the samples increased at room temperature and 125°C, but increased and then decreased at 200°C and 300°C. Pole figures were measured on these samples at increasing shear strains up to γ…
A copper–cerium oxide sample prepared with an atomic ratio, Cu : Ce, of 0.01 has been studied by electron paramagnetic resonance (EPR) spectroscopy. A well resolved spectrum of copper(II) ion pairs has been evidenced and the hyperfine structure of the perpendicular components clearly appears. The high resolution can b…
Abstract The objective of this chapter is to acquaint the reader with the molecular concepts of clay-water interactions that are pertinent for understanding the hydration, swelling, and rheological behavior of clays. In this regard, the topics of special importance are colloidal characteristics of the clay particles,…
The successive displacement of plasma proteins adsorbed to artificial surfaces (biomaterials) is well documented, mostly by specially designed experiments that stretch out the effect in time and space. Analysis of displacement has been focused principally on molecular events on the adsorbing surface. In this paper att…
The adsorption of three cell adhesive proteins with known thrombogenic activity [fibrinogen (FGN), fibronectin (FN), and vitronectin (VN)] was quantified from mono-component protein solutions, from a quaternary-component protein solution, and from plasma and diluted plasma in order to compare their potential for adsor…
Polyimides from 4,4′-hexafluoroisopropylidene diphthalic anhydride and fluorine-containing diamines varying in structure have been prepared in order to study the effect of different fluorinated segments upon the dielectric constant. The thermal and electrical properties of the new polymers are discussed. The effect of…
Abstract Organic anions can increase the solubility of P and Al in soils and may influence nutrient availability and soil weathering. In Spodosols of the southeastern USA, oxalate has been identified as the dominant organic anion. Therefore, the objectives of this study were to examine the influence of oxalate on the…
Twelve hydrogen-bonded hydrogen-L-tartrate salts, capable of second harmonic generation (SHG), have been synthesized {the crystal structure of piperazinium(2+) bis-hydrogen-L-tartrate, [H2NC4H8NH2][C4H5O6]2, is reported} the structural significance of hydrogen bonding and its use as a tool in crystal engineering is di…
The temporal evolution and morphology of two-dimensional grain growth are simulated by Monte Carlo simulation techniques. In the simulation, the anisotropy of the grain boundary energy is incorporated into the model. Compared with the case in which no anisotropy of boundary energy is assumed, the suppression of grain…
Thin films of tin‐doped , with different tin contents produced by a powder pyrolysis technique have been investigated by x‐ray absorption spectroscopy and x‐ray diffraction. At the indium K‐edge, extended x‐ray absorption fine structure (EXAFS) investigations reveal that the indium atomic environment is modified by th…
A kinetic model based on the theory of strain-induced interactions is developed to describe the effect of elastic strain on structural transformation kinetics. An ordering transition resulting in a reduction in the crystal lattice point-group symmetry in a substitutional solid solution is considered. Our computer simu…
The interaction of benzene with Faujasite (FAU) type structures with varying Si ∶ Al ratio and cation content has been analysed. Using the electronegativity equalization method (EEM), the charge perturbation of a benzene molecule located in the supercage (on the three-fold axis) and the interaction energies with the f…
Polymer-bearing lipids have recently been incorporated into liposomes that are used in in vivo drug delivery. This strategy has improved the liposome's ability to avoid the reticuloendothelial system and has thereby increased its circulation time in the bloodstream. In order to understand the physical basis for this,…
A new soluble, low band-gap polymer, poly(2,3-dihexylthieno[3,4-b]pyrazine)2b, which is dark blue–black in the neutral state and which becomes transparent light yellow when doped has been prepared; it has a doped film conductivity of 3.6 × 10–2 S cm–1 and a band-gap (film) of ca. 0.95 eV making it one of the lowest ba…
A series of chiral esters has been prepared that exhibits unusual liquid-crystalline properties. In this family of materials the general molecular structure is one where a rigid aromatic core has two peripheral aliphatic chains attached to it, one of which carries a chiral carbon atom adjacent to the core itself. The…
The ability of room temperature vulcanizing (RTV) silicone rubber insulator coatings to suppress leakage current, thereby preventing power outages due to contamination, was studied. The RTV coatings were applied to porcelain suspension and line post insulators for a comparative study of the performance of coated and u…
Abstract High density polyethylene (HDPE) is toughened by particles of rigid inorganic filler CaCO 3 , which is treated with phosphate. The stress‐strain curve of the HDPE/modified‐CaCO 3 (80/20) composite covers a greater area than that of HDPE, and the impact strength of HDPE is greatly improved by modified CaCO 3 f…
A rotaxane with two rigidly held porphyrins as stoppers is synthesized by a copper(I)-based template strategy.