Materials Literature
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Abstract The electrochemical polymerization of azure A has been carried out using repeated potential cycling. The scan potential is set between −0.2 and 1.3 V (vs. Ag/AgCl). The electrolytic solution consisted of 5 mmol dm −3 azure A and 0.5 mol dm −3 Na 2 SO 4 with pH 6.0. The temperature for polymerization was contr…
The dynamic mechanical properties and morphology of novel ethyl acrylate ionomers, poly(ethyl acrylate- co -itaconate) [P(EA- co -ITA)], were investigated. It was found that the P(EA- co -ITA) ionomers showed a well-developed cluster loss tangent peak, which was not seen in poly(styrene- co -itaconate) ionomers. This…
A novel one-dimensional copper(II)-radical complex [Cu(NITmPy)(N3)2(CH3OH)] [NITmPy = 2-(3′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide] has been synthesized and structurally characterized. The structure consists of neutral chains of copper(II) ions alternatively bridged by double symmetric end-on and asymm…
The reaction of iron(III) (meso-tetrakis(N-methylpyridinium-4-yl)porphyrin (Fe(III)TMPyP) with nitric oxide (NO) was studied by electronic absorption spectroscopy, ESR, and electrochemical and spectroelectrochemical techniques in aqueous solutions with pH from 2.2 to 12.0. Fe(III)TMPyP has been found to undergo a redu…
PbS nanocrystals were prepared using water/C 12 E 9 /cyclohexane microemulsions as nanoreactors. The sizes and morphologies of the cubic PbS nanocrystals can be modified by controlling the concentration of ions, the volume ratio of water to surfactant and the reaction temperature. The shuttle-like nanoparticles consis…
The alkali-resistant glass fibers (ARG) are coated with special sizings to provide superior alkali resistance and are designed to reinforce cementitious and other alkali matrixes. The assessment of changes in the fiber surface nanomechanical properties is essential for understanding the fiber bulk mechanical fracture…
Abstract By the use of atomic force microscopy (AFM), formation mechanism of nodular structure in cellulose acetate membranes was systematically investigated. Elementary factors affecting the nodule formation were delineated on the basis of both kinetic and thermodynamic considerations. It was shown that (1) the exact…
Abstract 1 H, 13 C [ 1 H]‐, and 2D HETCOR NMR spectroscopy have been employed to characterize polyacrylonitrile (PAN) homopolymer and copolymers of methacrylic acid (MAA) and itaconic acid (IA) prepared by solvent–water suspension polymerization technique in a mixture containing DMF (solvent) and water. The chemical c…
Abstract The Leeds die‐drawing process has been used to make oriented sheets of toughened polypropylenes. Die‐drawn oriented sheets were produced by drawing at 110°C to draw ratios of 4, 6, and 10. Comparative measurements have been undertaken of the plane stress fracture toughness at room temperature using the essent…
Abstract Nylon 10 12, a newly industrialized engineering plastic, shows a double‐melting phenomenon during melting. Partial melts were obtained when the sample was heated to the temperature between the two melting peaks. A differential scanning calorimeter was used to monitor the energies of the isothermal and nonisot…
A structural characterization of copolymers of syndiotactic polypropylene containing ethylene comonomeric units (PPET) in a wide range of concentrations (0.4−60 mol %) is presented. The copolymer samples are crystalline up to an ethylene content of 18−20 mol %. Ethylene units are partially included in the crystals of…
Sequential amide formation between poly(vinylamine- co - N -vinylformamide)s [poly(VAm- co -NVF)s] with VAm contents of 20, 28, and 42 mol % plus polyAAc using a water-soluble carbodiimide was studied to prepare ultrathin hydrogels on a solid substrate. The analysis of assembly amounts at each assembly step using a qu…
A new Schiff-base macrocycle is obtained by the lead(II) ion templated [2+2] condensation of 3,5-diacetyl-1H-1,2,4-triazole and 1,4-diaminobutane in the presence of sodium hydroxide. Transmetallation of the resulting dilead complex, Pb2(L2)(ClO4)21, in acetonitrile with two equivalents of CoCl2·6H2O leads to the isola…
Abstract To improve the mechanical and water vapor barrier properties of soy protein films, the transparent films were prepared by blending 5 wt % soy protein isolate (SPI) alkaline water solution with 2 wt % carboxymethylated konjac glucomannan (CMKGM) aqueous solution and drying at 30 °C. The structure and propertie…
We have performed x-ray, electrical resistivity, and Raman scattering measurements in ${\mathrm{La}}_{0.70}{\mathrm{Sr}}_{0.30}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}{\mathrm{O}}_{3}$ manganites, with x varying from 0 to 0.40. The appearance of new peaks in the Raman spectra as the Fe content increases is at…
Novel far-infrared (FIR) absorption spectroscopy in conjunction with multiple, fixed external magnetic fields (FIR magnetic spectroscopy, FIRMS) has been used to investigate pseudotetrahedral complexes with the formula M(PPh(3))(2)Cl(2) (M = Ni, Zn; Ph = C(6)H(5)). Crystal structures have been reported for the Ni comp…
Dynamics of low molecular weight and polymeric glass forming liquids in confined geometries has been studied by means of depolarized dynamic light scattering: photon correlation spectroscopy and Fabry-Perot interferometry. The pore size of the glassy matrix amounted to 2.5, 5.0, and 7.5 nm. The glass transition temper…
A mild sonochemical route was used to prepare Bi2Te3 nanocrystals, and Bi2Se2Te and Bi2SeTe2 ternary nano-alloys in aqueous solution; an interfacial mechanism for this sonochemical reaction is discussed. The basic thermoelectric properties (Seebeck coefficient) of the as-prepared nanocrystals were studied, and this si…
We report here the capping of cadmium sulfide nanoparticles (Q-CdS) with a Cd−DMSO complex as a consequence of particle preparation in dimethyl sulfoxide (DMSO). A characteristic sharp peak at 367 nm in the UV−vis for Q-CdS showed a gradual blue shift of ca. 41 nm, indicating the decrease in the particle size with tim…
We present a new quantum mechanics/molecular mechanics (QM/MM) embedding approach for systems with directional polar covalent bonds. This “covalent elastic polarizable environment” (covEPE) scheme features a variational treatment of an energy expression that includes all degrees of freedom of both the QM region (the “…