Materials Literature
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We have determined the surface plasmon excitation correction (SEC) factor for nickel in the 200–5000 eV range from the ratios of the absolute elastic scattering electron intensities measured by a novel cylindrical mirror analyser and those by the Monte Carlo method. The inelastic mean free paths (IMFPs) of nickel used…
A novel cationic conjugated polymer, poly[(9,9-dihexyl-2,7-fluorene)-alt-co-(2,5-bis{3-[ (N,N-dimethyl)-N-ethylammonium]-1-oxapropyl }-1,4-phenylene)] dibromide, which is water-soluble and emits bright blue fluorescence both in solutions and as films, is synthesized through Suzuki coupling reaction and a post-polymeri…
Half-fringe photoelasticity was used to evaluate the two-dimensional state of stress in epoxy matrix micro-tensile specimens. The experimental technique is described in detail and demonstrated by the measurement of the stress distribution around a circular hole in a thin epoxy film subject to uniaxial tension. The res…
The self-assembly of long chain alkoxy-substituted benzoic acids around tribasic core 1 provides a simple and flexible way to supramolecular liquid crystals with columnar mesophases.
Light scattering spectra of two polymers, polyisobutylene (PIB) and polystyrene (PS), were analyzed in the broad frequency range at temperatures above the glass transition (Tg ). At high temperatures, the spectra followed the qualitative scenario suggested by mode-coupling theory (MCT) of the glass transition. The cro…
Thin film characterization techniques such as Fourier transform infrared spectroscopy and ellipsometry and thermal analysis techniques such as differential scanning calorimetry, thermogravimetric analysis, and dielectric thermal analysis were used to monitor the thermal curing of hydrogen silsesquioxane. This study gi…
Synthesis, structural and magnetic characterization of tetranuclear [(Cu2L)2B] complexes [where H3L is the Schiff’s-base ligand, 1,3-bis(salicylideneamino)propan-2-ol; B is the dipyrazolate entities: methylenebis(3,5-dimethylpyrazolate) (mbdpz) or 4,4′-bi-3,5-dimethylpyrazolate (mdpz)] are reported. The structures rev…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTStructure of Shear-Induced Perforated Layer Phase in Styrene−Isoprene Diblock Copolymer MeltsJong-Hyun Ahn and Wang-Cheol ZinView Author Information Department of Materials Science & Engineering and Polymer Research Institute, Pohang University of Science and Technology, Pohang…
Two pentadentate tribasic ligand systems containing aniline or benzylamine nitrogens covalently linked to a proximate kinetically stable Eu or Tb complex are described. The affinity of these complexes and their non-conjugated analogues for Zn2+, Ca2+ and Mg2+ ions has been measured at ambient pH in a high salt backgro…
Various macrokinetic models, namely, the Avrami, the Tobin, and the Ozawa models, were applied to describe the crystallization process of syndiotactic polypropylene (s-PP) under nonisothermal conditions. Both Avrami and Tobin models were shown to provide a fair description of the experimental data. The Avrami exponent…
Highly substituted porphyrins exhibit significantly distorted, nonplanar conformations in the solid state. The crystallographically determined degree of nonplanarity correlates with a bathochromic shift of the absorption maxima in solution. In addition, nonplanar porphyrins with meso aryl groups show increasing in-pla…
Reaction of 3-(2-pyridyl)pyrazole with 3,3′-bis(bromomethyl)biphenyl resulted in the new ligand L1 which contains two bidentate chelating pyrazolyl/pyridine fragments separated by a meta-biphenyl spacer; this ligand is designed to act only as a bridging ligand, as the two bidentate sites are too far apart to co-ordina…
The effect of entanglements on the glass transition and structural relaxation behaviors has been studied for polystyrene (PS) and phenolphthalein poly(ether sulfone) (PES-C) samples by fast evaporation of the solution of concentrations varying from above the overlapping concentration to far below it, and compared to t…
The influences of solution pH, cation concentration, treatment temperature, time, and ZnO/Ga2O3 molar ratio of the starting solution on the crystallite size, morphology, lattice parameters and chemical composition of hydrothermally synthesized ZnGa2O4 spinel particles were investigated. Nanocrystalline ZnGa2O4 spinel…
A series of tri-component copolymers was synthesized by ring opening copolymerization of cyclic lactones, i.e. glycolide, L-lactide, and caprolactone, using stannous octoate as a catalyst. Various techniques, including FT-IR, 1H NMR, DSC, X-ray diffraction, tensile strength, and contact angle measurements, were used t…
A porous polyurethane vascular prosthesis with an internal diameter of 5 mm was studied. The graft carries a coating of immobilized dipyridamole (Persantin(R)) on the surface of its lumen. Dipyridamole is a potent nontoxic inhibitor of platelet activation/aggregation, and also a strong inhibitor of vascular smooth mus…
Compositional and temperature dependencies of saturation magnetization (M/sub s/) and uniaxial magnetocrystalline anisotropy (K/sub u/) are determined using single crystal CoCr-alloy thin films. Temperature dependencies of M/sub s/ and K/sub u/ are stronger with increasing Cr content. M/sub s/(OK) and Curie temperatur…
Differential scanning calorimetry (DSC), transmission electron microscopy (TEM), and small-angle neutron and X-ray scattering (SANS and SAXS, respectively) have been used to investigate the solid-state morphology of blends of linear (high-density) and model short-chain branched (linear-low-density) polyethylenes (HDPE…
The properties of the [Ru(NH3)5NO]3+ and [Ru(CN)5NO]2− ions are investigated by density functional theory and compared with those of [Fe(CN)5NO]2−. DFT calculations show that the electronic ground-state potential surface of these nitrosyl complexes has local minima (metastable states) with oxygen-bonded NO (MS1), i.e.…
The control of the polymorphism and architectural crystal assembly of calcium carbonate minerals in gels formed by means of collagenous matrices with entrapped polypeptides is reported. It has been observed that the calcium carbonate polymorphic selectivity is related to the local supersaturation within the microenvir…