Materials Literature
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The reversible dimerization of the electrochemically or chemically generated cation radicals of diversely substituted tetrathienylenevinylenes ( 1 − 6 ) has been analyzed by concentration and temperature-dependent cyclic voltammetry, UV−vis, near-IR, and ESR spectroscopies, and time-resolved spectroelectrochemistry. F…
Theoretical descriptions of the molecular polarizability and second hyperpolarizability (α and γ) of the linear quadrupolar molecule are presented. By using a valence-bond and two charge-transfer states, three eigenfunctions of a quadrupolar molecule are obtained as linear combinations of these basis states. The analy…
Electronic transport and optical measurements in polycrystalline Pbl2 are reported as part of a study to evaluate the material for large area x-ray imaging applications. The films are deposited by vacuum evaporation with thickness 20–100 μm and have grain sizes of up to 10 μm. The room temperature hole drift mobility…
Numerical simulations of Liesegang systems are performed both with a prenucleation and a postnucleation model. Special interest is dedicated to two-dimensional morphological peculiarities of ring systems. With the prenucleation model, apparent bifurcations or branch points (anastomoses) can be created by adjacent trai…
Deformation and relaxation properties of hypercrosslinked polystyrene networks have been studied by thermomechanical method at a uniaxial compression using individual spherical beads of the polymer. The networks examined were prepared by postcrosslinking of highly swollen beads of a styrene-0.3% DVB copolymer with 0.3…
The significance of the Liftshitz/van der Waals, Lewis-acid, and Lewis-base contributors to the total surface energy of a material is discussed in terms of the molecular design features and surface organization phenomena characterizing film structures prepared from four homologous series of polymeric compounds, namely…
The ab initio tensile test has been applied to the non-polar interface of the {122}, Sigma = 9 tilt boundary in cubic SiC, where the tensile strength and mechanical behaviour at zero temperature are examined using the ab initio pseudopotential method based on the local density-functional theory. This interface is stro…
The temperature dependence of the magnetic moment in ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ and ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ ferromagnetic manganites was studied by means of dc magnetic measurements and by NMR on ${}^{55}\mathrm{Mn}$ nuclei. In addition, for temperatur…
A new class of thiophene-based polymers characterized by the presence of one nonaromatic thienyl S, S -dioxide moiety (O) to every two, four, and six aromatic thienyl units (T) was prepared from the newly synthesized precursors TOT, TTOTT, and TTTOTTT, and electrochemically characterized. The polymers displayed remark…
Aluminum nitride (AlN) was produced via the combustion synthesis of loosely packed aluminum powder (pore fraction of ∼0.8) in a graphite reactor that was lined with permeable carbon felt. Almost‐complete conversion was achieved with a forced flow of nitrogen for beds 50‐150 mm deep (mass of 200‐650 g). The product was…
The crystal structures of Ti2AlN, Ti3SiC2, and Ti3AlC1.8, studied by high-resolution transmission electron microscopy confirmed the P63/mmc space group and the layered nature of these ternaries. The structure of Ti2AlN agrees with that previously determined from analysis of x-ray and neutron diffraction data. Converse…
Prussian blue molecule-based magnets can be designed to exhibit various magnetic properties. One of them based on chromicyanide and vanadium is a magnet at room temperature. Its properties are very sensitive to the synthetic reaction conditions, solvent effects and counterions which can be used to tune the Tc. To stud…
High‐toughness and high‐strength lead zirconate titanate (PZT) composites that contain fine silver particles were successfully fabricated at low sintering temperatures. Addition of silver to a PZT matrix did not result in unwanted reaction phases; however, some silver diffused toward the perovskite crystal structure.…
The transformation from ionic to neutral phases in tetrathiafulvalene-p-chloranil crystals is induced by exciting the charge-transfer absorption band below the transition temperature. The transformation takes place only above a threshold intensity of excitation, and the efficiency of generating neutral-phase domains i…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Comb-Type Biodegradable Polylactide through Depsipeptide−Lactide Copolymer Containing Serine ResiduesFumitaka Tasaka, Hidetake Miyazaki, Yuichi Ohya, and Tatsuro OuchiView Author Information Department of Applied Chemis…
A nanoindentation technique has been applied to demonstrate the mechanical actuation of thin films fabricated by glancing angle deposition. The films were comprised of a porous layer whose microstructures consisted of helical columns that resembled springs. Surmounting the porous layer was a dense capping layer which…
The deformation processes in crystalline polymers have been studie ever since the discovery of chain folding in 1957. Since then, scientists have been intrigued by the different steps of the transformation of the folded-chain lamellar structure of single crystals or of macroscopically isotropic, often spherulitic, pol…
Type 1 Cu centers in cupredoxins, nitrite reductases, and multi-copper oxidases utilize the same trigonal core ligation to His-Cys-His, with a weak axial ligand generally provided by a Met sulfur. In azurin, an additional axial ligand, a carbonyl oxygen from a Gly, is present. The importance of these axial ligands and…
Bacterial resistance to existing antibiotics poses a serious threat to human health. Because the peptidoglycan layer surrounding bacterial cells is essential for survival, the enzymes involved in peptidoglycan biosynthesis are attractive targets for the design of new antibiotics. Unfortunately, many of these enzymes a…
We report detailed lattice dynamical calculations of the large isotropic negative thermal expansion (NTE) over 0--1050 K in ${\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ in its cubic phase. The results bring out the unusually dominant quantitative contributions to NTE of the transverse acoustic, and librational and translation…