Materials Literature
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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…
The phase diagram of the pseudobinary Al 4 C 3 ‐AlN system was predicted using thermodynamic models. It was combined with previous thermodynamic descriptions of the pseudobinary Al4C3‐Al 2 O 3 and AlN‐Al 2 O 3 systems, and then thermodynamic properties of the pseudoternary Al 4 C 3 ‐AlN‐Al 2 O 3 system were assessed b…
The hyperthermophilic archaeon Pyrococcus furiosus produces an extracellular, glycosylated hyperthermostable subtilisin-like serine protease, termed pyrolysin (Voorhorst,W.G.B., Eggen,R.I.L., Geerling,A.C.M., Platteeuw,C., Siezen,R.J. and de Vos,W.M. (1996) J. Biol. Chem., 271, 20426-20431). Based on the pyrolysin cod…
A method has been developed to determine the diffusion coefficients of ferric ions in ferrous sulphate doped gels. A radiation induced edge was created in the gel, and two spin-echo sequences were used to acquire a pair of images of the gel at different points of time. For each of these image pairs, a longitudinal rel…
The layered manganite La 1.2 Sr 1.8 Mn 2 O 7 is important in that it displays giant negative magnetoresistance properties, and its study complements the growing body of what we know about the complex size−charge−temperature−magnetic field parameter space of the perovskites A III 1 - x A‘ II x MnO 3 . We report here th…
Electrospray mass spectrometry provides a rapid, convenient technique for characterizing and studying the chemistry of anionic metal sulfide thiolate clusters. Negative-ion electrospray mass spectra have been recorded for the thiophenolate-capped clusters [Me(4)N](4)[E(4)Cd(10)(SPh)(16)] (E = S, Se), [Me(4)N](4)[S(4)Z…
Other| August 01, 1997 Experimental study of Th-bearing LaPO4 (780 °C, 200 MPa); implications for monazite and actinide orthophosphate stability Renaud Podor; Renaud Podor Centre de Recherches sur la Geologie des Matieres Premieres Minerales et Energetiques, France Search for other works by this author on: GSW Google…
New polyconjugated oligomers—oligoaminophenols—have been prepared by the oxidative polycondensation reaction of aminophenols (APs) in the presence of oxidants (H2O2, NaOCl, KOH plus O2). It has been established that the reactivity of AP increases with the series of m- < o- < p-isomers in this reaction. The oligoaminop…