Materials Literature
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In pyridine, p-tolylisocyanate reacts with [NBun4]3[α-PMo12O40] to give a number of products, among which are the highly functionalized neutral species [Mo10(NC6H4Me-p)12(PY)2O18], the azo compound p-MeC6H4NNC6H4Me-p, and reduced derivatives of α-[PMo12O40]3–.
Two types of water detritiation systems have been designed for fusion reactors of ITER scale. One of the systems is a combination of WD (Water Distillation) and VPCE(vapor phase catalytic exchange) columns. The other is a combination of a WD column and a CECE(combined electrolysis catalytic exchange) column. Three wat…
We compute in the strong-segregation regime the phase diagram of A−B diblock copolymer with added B homopolymer to see if the bicontinuous phase can be stabilized by adding homopolymers. Our work is motivated by the results of Ajdari and Leibler, who showed using a bending expansion that a single copolymer bilayer in…
A single-flow surface model unifying damage mechanics and plasticity is developed for quasi-brittle solids in general and concrete in particular. The necessity of using both plasticity and damage mechanics is discussed, and the preference for developing a single-flow surface model over the existing bi-surface models i…
The first monosubstituted decasilasesquioxane, PhH9Si10O15, and the analogous PhH7Si8O12 molecule have been prepared and characterized by IR and Raman spectroscopy and X-ray crystallography. Both have crystallographic C1 symmetry, but their cages exhibit an approximate Cs, and an effective C3, symmetry, respectively i…
One-electron and multielectron reductions of 2,7,12,17-tetrapropylporphycene (H 2 TPrPc) and its Fe, Co, Ni, Cu, and Sn complexes in 2-PrOH solutions have been studied by radiolytic techniques. Formation and decay of intermediates formed upon one-electron reduction have been followed by kinetic spectrophotometric puls…
X-Ray structural analyses of the charge-transfer complex (EDT–TTFC12)2·TCNQF4, 2, and the radical cation salt EDT–TTFC12·ClO4, 3, revealed an interesting effect of chlorine substitution on the crystal stacking mode; the electrical conductivity of 2 is unusually high, although it has a mixed-stacking structure.
The electronic structure of Mg 2 Ti 2 B 2 O 8, a warwickite with Mg in the outer octahedra, Ti in the inner ones, is studied with approximate molecular orbital calculations. A chemical construction of the band structure, density of states, and bonding of this material begins with molecular octahedral and bioctahedral…
We investigated the effect of bulky pendent side groups on the structure of mesophase in a thermotropic main-chain liquid-crystalline polymer, poly[(phenylsulfonyl)- p -phenylene 1,10-decamethylenebis(4-oxybenzoate)] (PSHQ10), synthesized in the present study. For comparison, poly( p -phenylene 1,10-decamethylenebis(4…
Tribromo-trialkoxytriphenylenes and trialkoxytriphenylenes are derivatized directly on a polyaromatic core to give novel discotic liquid crystals radially substituted symmetrically and asymmetrically with two different functionalities.
TbIII chelates containing aromatic moieties show sonoluminescence in aqueous solutions during the sonolysis of water. The observed 5D4→7FJ transitions of TbIII are due to the excitation of ligand, followed by an intramolecular energy transfer from the ligand to the central ion, which finally emits. No sonoluminescence…
Abstract Results concerning the catalytic activity of catalysts prepared by Equilibrium Deposition Filtration (EDF) and corresponding catalysts prepared by conventional impregnation techniques are reported. These results show that the EDF and co‐EDF methodologies may be used for preparing very active catalysts even wi…
The photodegradation of alkannin/shikonin (A/S) was studied as a function of solvent polarity, pH and ionic strength. This process follows an apparent first-order kinetic reaction. The photodegradation rate is inversely proportional to the solvent polarity in the order of chloroform > dichloromethane > 2-propanol > et…
A series of tests was run to characterize the through-the-thickness tensile strength of a variety of composites that included two-dimensional (2D) braids, 2D and three-dimensional (3D) weaves, and prepreg tapes. A new test method based on a curved beam was evaluated. The through-the-thickness deformations were charact…
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A number of new poly(organophosphazenes) have been synthesized which bear 2-butenoxy or (4-(allyloxy)phenyl)phenoxy side groups. Cosubstituent groups included trifluoroethoxy, phenoxy, or (benzyloxy)phenoxy groups. Species with (4-(allyloxy)phenyl)phenoxy units underwent Si−H coupling with linear silanes or siloxanes…
We studied the mechanism behind the double-zincate process, used for pretreating aluminum alloy, through SEM observation, electrode potential tracing, and weight changes determined during each zincate process. Zinc particles grew during the first zincate process, with a thin, uniform Zn layer forming during the second…
Very sharp deformation textures, with single maxima of more than 50x random centred on the rotated cube component ({001}<110>), were produced by submitting a non‐oriented electrical steel sheet to various sequences of cross‐rolling. The cold rolled sheets were subsequently annealed at 730 º C for 3 min. The resu…
In the ZrO 2 ‐Cr 2 O 3 system, metastable t ‐ZrO 2 solid solutions containing up to 11 mol% Cr 2 O 3 crystallize at low temperatures from amorphous materials prepared by the hydrazine method. The lattice parameter c decreases linearly from 0.5149 to 0.5077 nm with increased Cr 2 O 3 content, whereas the lattice parame…
The potential for using subsize specimens to determine the actual properties of reactor pressure vessel steels is receiving increasing attention for improved vessel condition monitoring that could be beneficial for light-water reactor plant-life extension. This potential is made conditional upon, on the one hand, by t…