Materials Literature
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The corrosion behavior of Zr alloys depends on the kind, size, and distribution of the intermetallic second-phase particles. TEM examinations of Zr-Sn-Fe-Cr alloys irradiated in PWRs at temperatures between 300 and 370°C and fast fluences in the range of 5E21 to 1.3E22 cm-2 have been performed to study the irradiation…
The occurrence of platelet phases in equiax, directionally solidified (DS), and single crystal (SC) turbine blades, vanes, and integral wheels was investigated.Examples of platelet phases in turbine components made from low carbon PWA1480, Cl03 (or PWA1483, AF56, or SX792), IN792+Hf (or ClOl), lN939, lN6203, and GTDll…
This study investigates the stoichiometry and the thermal stability of K(+)- and CO(3)(2)(-)-containing apatites (KCAp's) obtained by the hydrolysis of monetite. The analysis results of the samples after drying reveal that the KCAp's start to lose carbonate at temperatures </= 400 degrees C. The predominant substituti…
A double submerged impinging jet (DSIJ) cell has been built allowing an identical hydrodynamic regime to be established on both faces of a bipolar electrode consisting of either a Pt sheet or a free-standing polypyrrole (PPy) membrane. Both electrode materials have been studied in this cell, in the presence of electro…
A new type of self-assembled porphyrin/phthalocyanine multilayer film is prepared by alternating deposition of oppositely charged rigid planar molecules; the deposition process and photochemical and photophysical properties are studied in detail.
The equilibrium conditions for two-dimensional (cylindrical) solid−liquid−fluid systems are developed, taking into account the possibility of constraints imposed on the motion of the contact lines. The solid surface is assumed to be rigid, insoluble, and nonreactive, but it may be rough or heterogeneous or both. The l…
The combined effects of non-planarity in the porphyrin macrocycle and β-substitution on the photophysical properties of a series of basket-handle porphyrins are described. The introduction of a short chain across the periphery of the porphyrin ring induces deformation in the porphyrin ring and β-substitution further e…
Grain boundary diffusion of Ag in Cu and in a Cu-0.091 at.% Ag alloy has been investigated. An experimental method to separate the effect of different grain boundaries present in the samples and the effect of segregation on grain boundary diffusion profiles is described. It is shown that in the case of silver diffusio…
Graft copolymerization of styrene onto mercaptochitin has been examined. Chitin was first tosylated to give tosylchitin, which was subsequently transformed into mercaptochitin. Athough the graft copolymerization was carried out in suspension, it proceeded efficiently to give chitin derivatives having polystyrene branc…
Liquid crystalline ordering in polymer brushes formed by macromolecules with mesogenic groups in the main chain and immersed in a solvent is investigated theoretically by numerical calculations within a self-consistent field approximation. Existence of a microphase-segregated brush regime with a collapsed orientationa…
Sodium sulfonated poly(styrene−ethylene−butylene) random ionomers [P(SEB- co -SSNa)] were obtained by hydrogenation, sulfonation, and neutralization of styrene−butadiene copolymers containing 45 wt % styrene. The dynamic mechanical properties were measured as a function of temperature for ionomers of a wide range of i…
The first two transition metal compounds incorporating triazole-nitronyl-nitroxide radicals as ligands have been synthesized. These compounds are [Cu(4-Me-3-Nit-trz)(4)](ClO(4))(2) (1) and [Ni(4-Me-3-Nit-trz)(4)](ClO(4))(2) (2) with 4-Me-3-Nit-trz = 2-(3-[4-methyl-1,2,4-triazolyl])-4,4,5,5-tetramethylimidazoline-1-oxy…
Prolonged photolysis of aqueous solutions containing α-K5[BW12O40]·9H2O 1 and MeOH at pH 0.1 led to the formation of the diamagnetic six-electron-reduced species K5[BW12O37(H2O)3]·13.5H2O 2, via successive disproportionations between the protonated two-electron reduced species [H2BW12O40]5–. Single-crystal X-ray diffr…
We examined the catalytic efficiency of 18 pig citrate synthase mutants. The residues mutated were selected according to two criteria: the conservation of that residue in all known citrate synthase sequences, and the importance of that residue in substrate-amino acid interactions suggested by the extensive crystal str…
As a first step in understanding the calcification mechanism, a matrix protein in the gastrolith of the crayfish Procambarus clarkii was purified and sequenced. The protein was insoluble in acid, but after trypsin digestion, it dissolved in 6 M urea. The trypsin-digested protein dissolved in urea solution was purified…
Three different structural models, a random pore model, a changing grain size model, and a distributed pore size model (DPSM), have been used to predict the sulfation conversion ( X s ) vs time ( t ) curves of seven limestones with different pore structure in seven narrow particle size cuts between 100 and 2000 μm. No…
A unique, unexpectedly stable rhodium complex containing hydride, alkene and dioxygen ligands in cis-positions to each other is synthesized and fully characterized spectroscopically and crystallographically.
A study of crystallization, melting, and morphology is carried out for homopolyimides derived from 3,3‘,4,4‘-biphenyltetracarboxylic dianhydride (BPDA) and either 1,3-bis(4-aminophenoxy)benzene (134APB) or 1,12-dodecanediamine (C12), as well as copolyimides containing different compositions of 134APB and C12. For copo…
Secondary kH/kT kinetic isotope effects in H2O and kH/kT or kD/kT isotope effects in D2O have been measured for the triosephosphate isomerase-catalyzed conversion of dihydroxyacetone 3-phosphate (DHAP) to D-glyceraldehyde 3-phosphate. The proton transfer steps are made rate-limiting using [1(R)-2H]-labeled substrate i…
The interaction of water as a solvent on selected faces of crystals of N-n-octyl-D-gluconamide and α-resorcinol has been examined using the Monte Carlo molecular simulation technique. The interaction energies for N-n-octyl-D-gluconamide are in good agreement with the experimentally observed contact angles, and indicat…