Materials Literature
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An attenuated total reflection (ATR) method for surface plasmon polariton (SPP) excitation was studied to improve the sensitivity level of the classical Raman scattering from adsorbates on a metal surface. The enhancement of the Raman band intensity using both in- and out-coupling of the SPP is 400 for copper phthaloc…
The reaction of ebis (title ligand) with TCNQ produces a mixed-valence salt formed by a tetracation consisting of one centrosymmetric molecule of the neutral ligand and two dications, mutually related by the symmetry center and bearing a Se−Se bridge. The neutral ligand and the two dications are held together by the S…
We have synthesized a new poly(imide) precursor for solution electrodeposition onto conducting surfaces. The new monomer, N, N‘ -bis[ p -phenylamino(phenyl)]-1,4,5,8-naphthalenetetracarboxylic diimide (DNTD), contains a central naphthalene diimide moiety flanked by two dimerizable diphenylamine groups. DNTD was oxidat…
Applications of quantum chemistry approaches are considered to elucidate the mechanisms of structural phase transitions in H-bonded molecular crystals. The KH 2 PO 4 (KDP) family and squaric acid (H 2 SQ) are studied as examples. Proton rearrangements within H-bonds O H···O ⇄ O···H O are treated in terms of variation…
Anion-deficient perovskite oxides of the formula AM 1- x Al x O 3- x (A = Na or K; M = Nb or Ta) have been prepared for 0 < x ≤ 0.5. Diffraction experiments reveal that while the potassium compounds adopt orthorhombic/cubic perovskite structures similar to the parent KNbO 3 /KTaO 3, the sodium compound, NaNb 0.5 Al 0.…
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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