Materials Literature
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Kinetics of lamellar microstructure development of poly(aryl ether ether ketone) (PEEK), poly(aryl ether ketone ketone) containing 70% isophthalate moieties (PEKK(30/70)) and their 50/50 blend during isothermal crystallization and subsequent melting have been studied by DSC, transmitted light intensity, and time-resol…
The theory of depletion flocculation in colloid + nonadsorbing polymer mixtures is extended to cover size polydispersity of the polymer. The case of colloid + binary polymer mixture is studied in detail. The main conclusion is that phase separation is enhanced in a colloid + binary polymer mixture when compared with a…
A structural characterization of two series of ferroelectric low molar mass organosiloxanes is described. X-ray and dilatometry studies have been used to determine the impact of variations in mono- or di-mesogen architecture, halogen substitution and siloxane content on the mesophase structure and thermal behaviour. A…
We show that a conventional continuum formulation of the equations and boundary conditions for the spreading of a pure molten material over a cold, solid substrate of its own kind has no meaningful solution for the angle of attack θs of the fusion front at the contact line, which is the quantity that determines contac…
Abstract The “C” family of alloys, the original being Hastelloy® alloy C (1930's) was an innovative optimization of NiCr alloys having good resistance to oxidizing corrosive media and NiMo alloys with superior resistance to reducing corrosive media. This combination resulted in the most versatile corrosion resistant a…
In this paper we report on crystal growth and the electrical characterization of the compounds CuGaTe2, CuInTe2 and their solid solutions CuIn1—xGaxTe2. Single crystals were obtained by zone melting and a vertical Bridgman technique. From resistivity and Hall effect measurements in the temperature range of 35 to 400 K…
Abstract The crystal structure of a natural, ordered IIb-4 triclinic clinochlore has been refined in space group C 1̄ from 4282 unique X-ray intensity measurements of which 3833 are greater than 3 times the statistical counting error (3σ). Unit cell parameters are a = 5.3262(6) Å; b = 9.226(1) Å; c = 14.334(3) Å; α =…
We study the self-organization of a polydisperse A−B multiblock copolymer melt with repulsive interactions between the different monomers. In the framework of the one-loop (Hartree) approximation we consider the influence of the polydispersity parameter u, which is the ratio of the first two moments of the block lengt…
This paper presents the orientational relaxation of nonlinear optical (NLO) chromophore in a linear polyurethane of T-polymer based on 4-[(2-hydroxyethyl)amino]-2-(hydroxymethyl)-4‘-nitroazobenzene (T-AZODIOL) and aromatic diisocyanate of tolylene 2,4-diisocyanate (TDI). T-polymer has the feature that NLO dipole momen…
We propose a theoretical model that successfully describes numerically such major features of the electrical conductivity of the surface of ice as its magnitude and frequency dependence. Comparison of the model with experimental results on σ s confirms that the magnitudes of the ice surface charge density and ice surf…
The microbiological barrier properties of food-packaging paperboards, coated with polyethylene, mineral pigment or a biodegradable polymer and of high-density paper were examined with confocal laser scanning microscopy. The results show that the spatial distribution of microscopically observable bacterial cells was un…
Abstract An Fe-berthierine occurs in a buried laterite from the Late Cretaceous (Cenomanian) in southwestern Minnesota. It formed beneath a lignitic horizon in which reducing solutions percolated through a laterite comprising gibbsite, kaolinite and goethite. Morphologic differences suggest 2 separate conditions of Fe…
Transition metal oxides are a class of materials that are vitally important for developing new materials with functionality and smartness. The unique properties of these materials are related to the presence of elements with mixed valences. The measurement of cation valence states can be performed using X-ray photoele…
For the first time, it has been observed that tin island films used in surface infrared experiments give rise to an electromagnetic enhancement of the infrared absorption spectrum. The surface enhancement of the infrared (SEIR) absorption by tin island films is shown for evaporated nanometric films of 5,14-pentacenedi…
A rhodium(II) porphyrin bimetalloradical complex, • Rh(CH 2 ) 6 Rh • ( 1 ) reacts with CO and ethene to form an ethanedionyl reductive coupling product, Rh(CH 2 ) 6 Rh(μ-C(O)C(O)) ( 2 ), and an ethylene-bridged complex, Rh(CH 2 ) 6 Rh(μ-CH 2 CH 2 ) ( 4 ), respectively. Reaction of 1 with 1,3-butadiene proceeds by a 1,…
Quantum chemical calculations have been performed using density functional theory to model the mechanism of selective catalytic reduction of NO by NH 3 on vanadium oxide. The reaction is initiated by NH 3 adsorption on a Brønsted site modeled as a dimer cluster model representative of vanadium oxide, containing a term…
Bacterial adhesion is a central step in infection on biomaterial surfaces; however, the relation between biomaterial surface properties and adhesion remains poorly understood. To quantitatively determine the relationship among polyurethane surface properties, protein coating, and adhesion, we have compared attachment…
Evaluation of Surface Complementarity, Hydrogen bonding, and Electrostatic interaction in molecular Recognition (ESCHER) is a new docking procedure consisting of three modules that work in series. The first module evaluates the geometric complementarity and produces a set of rough solutions for the docking problem. Th…
The structural and physical properties of layered cuprates of a $R{\mathrm{CuO}}_{2}$ delafossite structure have been investigated for various rare-earth elements $R:$ Y, La, Pr, Nd, Sm, and Eu. An oxygen-rich delafossite-derived phase, $R{\mathrm{CuO}}_{2+\mathrm{\ensuremath{\delta}}}$ $(\ensuremath{\delta}>~0.5),…
Sodium tetraphenylboron (NaBPh4) can extract both exchangeable K+ and nonexchangeable K+ held in the interlayer of phyllosilicate minerals in soils and is a potential soil test method for plant-available K+. Eleven midwestern soils were used to (i) compare the ability of various kinetic equations to model nonexchangea…