Materials Literature
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The diamond-to-\ensuremath{\beta}-tin phase transitions of Si and Ge under uniaxial compression are investigated with ab initio calculations. A thermodynamic analysis is used to identify the transition pressures at uniaxial compression. The transition pressures were found to be pronouncedly lower than those at hydrost…
The depletion interaction between two parallel repulsive walls confining a dilute solution of long and flexible polymer chains is studied by field-theoretic methods. Special attention is paid to self-avoidance between chain monomers relevant for polymers in a good solvent. Our direct approach avoids the mapping of the…
In this work, we present the results of the investigation of the effect of prolonged cycling on the hydriding/dehydriding properties and on the structure of nanocrystalline MgH 2 −V composite under hydrogen containing 110 ppm of carbon monoxide. The hydrogen charge and discharge kinetics of the nanocomposite hydride w…
An experimental study showed the enhancement effect of di- tert -butyl peroxide on poly(α-methylstyrene) (PAMS) thermal degradation in trichlorobenzene solution (12.5 g/L). Peroxide was continuously injected into the reacting polymer solution at low flow rates (0.3−4.0 mL/h). Samples were taken periodically and analyz…
The cis-doubly N-confused porphyrin, H2N2CP, containing two adjacent confused pyrrole rings has been investigated from the point of view of its acid-base and electrochemical behavior in dichloromethane. This novel porphyrin isomer can form two metal-carbon bonds in the central core, stabilizing metal ions in unusually…
An approach to generate inversion walls in nematic liquid crystals using optical reorientation is described. Planar cells with small pretilt are exposed to an oblique laser beam, which reverses the director tilt angle within the irradiated area. During the electric Freedericksz transition an inversion wall surrounding…
The changes in the structure and catalytic activity of three iron oxides (α-FeOOH, γ-Fe 2 O 3, and an Fe 3 O 4 −C composite) were studied by temperature-programmed desorption/degradation (TPD) and XRD analysis. Thermal desorption analysis was performed for the fresh iron oxide catalysts. Thermal degradation experiment…
The results of an assessment of the state-of-the-art in the design and manufacturing of large composite structures are described. The focus of the assessment is on the use of polymeric matrix composite materials for large airframe structural components, such as those in commercial and military aircraft and space trans…
The tetrabutylammonium gamma-dodecatungstosilicate has been crystallized in a 6/1 acetonitrile/water solvent. An X-ray single-crystal analysis was carried out on [N(C4H9)4]4-gamma-[SiW12O40] which crystallizes in the orthorhombic system, space group P2(1)2(1)2(1), with a = 19.0881(3) A, b = 21.4435(3) A, c = 26.0799(1…
The interaction between swift charged particles and the electronic surface modes of a cylindrical cavity is described according to classical and quantum-mechanical formulations. We perform a quantization of the collective modes and obtain expressions for the coupling with external probes moving with arbitrary trajecto…
A variety of naturally occurring biomaterials owe their unusual structural and mechanical properties to layers of beta-sheet proteins laminated between layers of inorganic mineral. To explore the possibility of fabricating novel two-dimensional protein layers, we studied the self-assembly properties of de novo protein…
The mononuclear PPh4[Fe(phen)(CN)4]*2H2O (1) complex and the cyanide-bridged bimetallic [[Fe(phen)(CN)4]2M(H2O)2]*4H2O compounds [M = Mn(II) (2) and Zn(II) (3); phen = 1,10-phenanthroline; PPh4 = tetraphenylphosphonium cation] have been synthesized and structurally and magnetically characterized. Complex 1 crystallize…
The phase state of 25 poly(ethylene oxide- b -isoprene) (PEO−PI) diblock copolymers spanning the composition range 0.05 < f PEO < 0.8 has been studied using small-angle X-ray scattering and rheology. In addition, the thermal and thermodynamic properties have been obtained from differential scanning calorimetry and pre…
We present large-scale molecular-dynamics simulations of a nematic-isotropic interface in a system of repulsive ellipsoidal molecules, focusing in particular on the capillary-wave fluctuations of the interfacial position. The interface anchors the nematic phase in a planar way, i.e., the director aligns parallel to th…
Direct comparison of scanning tunneling microscopy and high resolution core level photo-emission experiments provides a rationale for the mechanism of formation of a two dimensional (2D) binary alloy (1/3 mono-layer (ML) Sn(1- x)Six/Si(111)-\sqrt3X\sqrt3R30). In contrast with recent theoretical predictions, the pure m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDyeing CrystalsBart Kahr and Richard W. GurneyView Author Information Department of Chemistry, University of Washington, Box 351700, Seattle Washington 98195-1700 Cite this: Chem. Rev. 2001, 101, 4, 893–952Publication Date (Web):March 27, 2001Publication History Received8 Ju…
A comprehensive investigation of ultrasonic frequency and its role in sonochemical activity and sonoluminescence (SL) has been performed. SL spectra and intensity were examined at four frequencies (205, 358, 618, and 1071 kHz) and in the presence of varying argon and oxygen saturation ratios. A series of high-energy r…
Transparent nanostructured NiO electrodes have been prepared by heating Ni(OH) 2 sol−gel films at a temperature of 300−320 °C. Nanostructured NiO (bunsenite) behaves as a p-type semiconductor and has an indirect band gap of 3.55 eV. It shows a strong anodic electrochromic effect, as it changes color from transparent t…
Abstract In this article, sulfonated ethylene‐propylene‐diene monomer terpolymer (H–SEPDM) was used to treat CaCO 3 particles. CaCO 3 particles are encapsulated by H–SEPDM through the reaction of sulfonic acid group (SO 3 H) in H–SEPDM with CaCO 3 to improve the interface adhesion of CaCO 3 with HDPE. In case the tre…
Abstract In this article, flexible nylon 6,6 was reinforced with rigid‐chain aromatic polyamides based on poly(4,4′‐diphenylsulfone terephthalamide) (PSA), poly( p ‐diphenyl oxide terephthalamide) (POA), poly( p ‐diphenylmethane terephthalamide) (PMA), and isophthaloyl chloride (IPC). Various high molecular weight blo…