Materials Literature
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Manganese N-confused porphyrins activate C-C and C-H bonds upon heating or air oxidation; the dimer complex [Mn(NCTPP)]2 is reduced at two meso positions, and the pyridine coordinated monomer breaks the internal C-H bond upon heating or exposure to oxygen.
We report simulations demonstrating subwavelength focusing of electromagnetic waves, from one homogeneous and isotropic dielectric to another, through a flat lens made of a realizable negative-refractive-index (NRI) metamaterial. The NRI metamaterial consists of a two-dimensional inductor/capacitor (L/C) loaded transm…
The mechanism behind superconformal filling of fine features during surfactant catalyzed chemical vapor deposition (CVD) is described and the metrology required to predict it is identified and quantified. The impact of adsorbed iodine coverage on copper deposition rate during chemical vapor deposition of copper on pla…
The isolation and structural elucidation by single crystal X-ray diffraction of triclinic and monoclinic modifications of an inclusion complex of beta-cyclodextrin with the same guest, methylparaben, are reported.
The first preparation of an Fe(II) spin-crossover complex including a 1,3-dithiole ligand is reported. Crystal analyses of both the low- and the high-temperature phases reveal that short S...S contacts play a key role in an abrupt spin transition.
Abstract The rheological and mechanical properties of a polystyrene‐polyisobutylene‐polystyrene (SIBS) block copolymer containing 30 wt% polystyrene (PS) and its blends with PS (SIBS/PS) were investigated. Atomic Force Microscopy (AFM) was used to visualize the nanostructured phase morphology of the SIBS, which is res…
Long-term water exposure may degrade polymer-matrix composites. This study investigated the water-aging of whisker composites. It was hypothesized that whiskers would provide stable and substantial reinforcement, and that whisker type would affect water-aging resistance. Silica-fused Si(3)N(4) and SiC whiskers were in…
We report unprecedentedly high electrocatalytic activity of electropolymerized films of poly(3,4-ethylenedioxythiophene) (PEDOT) toward the redox reactions of 2,5-dimercapto-1,3,4-thiadiazole (DMcT) which is a promising cathode material for high-energy Li-ion batteries. The irreversible redox reaction of DMcT monomer…
The electrochemical behavior of vanadium(II) was examined in the 66.7-33.3 mole percent aluminum chloride-1-ethyl-3-methylimidazolium chloride molten salt containing dissolved VCl2 at 353 K. Voltammetry experiments revealed that V(II) could be electrochemically oxidized to V(III) and V(IV). However at slow scan rates…
meso-Tetraalkyltetrabenzoporphyrin (TATBP) and related transition metal benzoporphyrin liquid crystalline compounds, TATBPMnCl, TATBPNi, and TATBPCu (4 series, 28 kinds) are reported that display a hexagonal columnar discotic columnar (Colh) phase. These liquid crystalline compounds have been studied by cyclic voltamm…
Hexasilsesquioxane cages (T6) have been prepared from a range of alkyl and aryl trichlorosilanes using a "non aqueous" hydrolysis with dimethyl sulfoxide.
Precipitation in a commercial duplex stainless steel, Zeron-100, has been investigated using conventional and high-resolution electron microscopy. Acicular fcc precipitates of Ni-rich nphase formed in the Cr-rich fmatrix by suitable heat treatment. The orientation relationships between a large number of particles and…
Microstructural and mechanical properties of organic surfactant templated nanoporous thin silica films have been studied by X-ray diffraction, Fourier transform infrared spectroscopy, and nanoindentation. Compared with many other porous low- k dielectrics, the self-assembled molecularly templated nanoporous silica fil…
An attempt has been made to obtain strongly cube-textured sheet steels with fine grains employing oxide-separator-induced decarburization. The steels of the chemical compositions around Fe–3%Si–1%Mn–0.05%C were hot-rolled, twice cold-rolled with in-between annealing into 0.35 mm thickness and then subjected to the lam…
A novel photochromic multilayer film containing polyoxometalates has been fabricated using layer-by-layer self-assembly.
Superparamagnetic as well as fine ferrimagnetic particles such as Fe3O4, have been extensively used in magnetic field induced localized hyperthermia for the treatment of cancer. The magnetic materials with Curie temperature (Tc) between 42 and 50 degrees C, with sufficient biocompatibility are the best candidates for…
The shear problem for nematic polymers consists in characterizing all stable stationary orientational distributions, steady and unsteady, versus shear rate and material parameters. Continuum theory [cf. Leslie (1968), Ericksen (1960)] provides formulas for the shear response of liquid crystals in terms of a single vis…
One-bond Pt-Pt nuclear spin-spin coupling constants J(Pt-Pt) for closely related dinuclear Pt complexes can differ by an order of magnitude without any obvious correlation with Pt-Pt distances. As representative examples, the spin-spin couplings of the dinuclear Pt(I) complexes [Pt(2)(CO)(6)](2+) (1) and [Pt(2)(CO)(2)…
The synthesis of 2-(4-phenyl)-6-anthracenes and 4,4′-bisphenyl-2,6-anthracenes, disubstituted by saturated (decyloxy) or unsaturated ((Z)-dec-4-enyloxy) chains, is reported. All the materials are liquid crystals and exhibit smectic A and/or C phases. As compared to the saturated chains, the unsaturated ones provide a…
The Manufacturing Advisory Service (MAS) is a concept level manufacturing process and material selection tool, geared toward educating designers in basic process capabilities and informing experienced designers about new technologies. The designer enters a dialogue with the MAS, answering questions about production qu…