Materials Literature
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Abstract Two different types of plasticized poly(vinyl chloride) (PVC) used for biomedical disposable devices—extruded and injection moulded—were studied in the non‐sterilized condition and after 25 and 50 kGy of beta irradiation. The polymer surfaces were analysed by scanning electron microscopy (SEM) equipped with a…
Abstract Poly(vinyl chloride) was blended with an acrylic rubber at a variety of blending ratio using a twin‐screw extruder. The acrylic rubber was compounded with sulfur and sodium stearate in a two‐roll mill prior to the blending. Dynamic vulcanization was performed in a compression mould at 170°C. Mechanical proper…
Abstract A new one‐dimensional phase, CsGaSe 3 has been synthesized and characterized by single crystal X‐ray diffraction, differential thermal analysis, and single crystal UV/Vis spectroscopy. The structure contains infinite chain anions, [GaSe(Se 2 )] — separated by Cs cations. The Ga 3+ cation is in a distorted tet…
The incommensurately modulated structure of the fresnoite framework-structure type compound Ba(2)TiGe(2)O(8) has been solved using a (3 + 1)-dimensional superspace approach. The structure is orthorhombic and adopts the superspace group Cmm2(0,beta,1/2)s00 with beta approximately 0.635 at room temperature. The refineme…
Carbon monoxide (CO) adsorption at 90 K on Cu(100), (110), and (111) covered with submonolayer Fe at room temperature has been investigated using infrared reflection absorption spectroscopy (IRRAS). Saturated adsorption of CO on the 0.3-monolayer (ML)-thick Fe/Cu(111) bimetallic surface yields two C−O stretch bands at…
Dielectric spectroscopy was carried out on the van der Waals liquid, 1,1(')-di(4-methoxy-5-methylphenyl)cyclohexane (BMMPC) in the supercooled state at pressures up to 218 MPa. The excess wing in this type-A glass former exhibits a response to pressure and temperature changes that is identical to that of the primary s…
The crystal structure of a 4-alpha-helical bundle protein has been determined by the application of a 23-dimensional molecular-replacement search performed using a stochastic method. The search model for the calculation was a 26-residue-long polyalanine helix amounting to less than 13% of the total number of atoms in…
Abstract Blends of styrene–butadiene–styrene (SBS) or styrene–ethylene/1‐butene–styrene (SEBS) triblock copolymers with a commercial mixture of polystyrene (PS) and poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) were prepared in the melt at different temperatures according to the chemical kind of the copolymer. Although…
Structures of porcine insulin crystals soaked in 1 M sodium sulfate at pH 5.00, 5.53, 5.80, 6.00, 6.16, 6.26, 6.35, 6.50, 6.98 and 9.00 have been determined at between 1.7 and 1.9 A resolution. GluB13 exhibits a single conformation at pH </= 5.80, two conformations between pH 6.00 and 6.98 and a single conformation at…
Abstract The morphology, mechanical and viscoelastic behavior of latex blends of unvulcanized natural rubber (NR) with carboxylated styrene‐butadiene rubber (XSBR) were investigated, with special reference to the effect of the blend ratio, temperature, and frequency. Mechanical properties like tensile strength, modulu…
The ${}^{93}\mathrm{Nb}$ and ${}^{45}\mathrm{Sc}$ nuclear-magnetic-resonance (NMR) spectra of disordered relaxor ferroelectrics ${\mathrm{PbSc}}_{1/2}{\mathrm{Nb}}_{1/2}{\mathrm{O}}_{3}$ (PSN) and ${\mathrm{PbMg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}$ (PMN) have been studied at $T>{T}_{m},$ where ${T}_{m}\ensur…
We consider molecular dynamics simulations to study a polymerlike liquid meniscus between two parallel plates moving at constant opposite velocities. We investigate contact line motion versus the speed of the solid and the shapes of the liquid interface for several liquid/solid interaction amplitudes. The associated w…
An interfacial stress rheometer has been used to study the rheological properties of a silicone oil/water interface in the presence of siloxane surfactants that are used in the personal care industry as water-in-silicone-oil emulsifiers. The surfactants are graft-type poly(dimethylsiloxane)−poly(oxyalkylene) copolymer…
We show that the existence of stable, ordered $3d\ensuremath{-}5d$ intermetallics CuAu and NiPt, as opposed to the unstable $3d\ensuremath{-}4d$ isovalent analogs CuAg and NiPd, results from relativity. First, in shrinking the equilibrium volume of the $5d$ element, relativity reduces the atomic size mismatch with res…
Abstract A method to quantify the composition of thin films using infrared spectroscopic ellipsometry (IRSE), supplemented by visible spectroscopic ellipsometry (VISSE), is proposed. Because ellipsometry measures the thickness and optical constants of a surface layer simultaneously, the absorption coefficient of the f…
Branched copolymers with a dendritic structure were synthesized by grafting poly(2-vinylpyridine) (P2VP) side chains onto linear and arborescent polystyrene substrates of generations G0−G2 randomly functionalized with acetyl groups. The P2VP side chains were generated in tetrahydrofuran using 1,1-diphenyl-3-methylpent…
We have carried out a broad survey of tetraphenylporphyrin derivatives in relation to their possible hyperporphyrin character. The majority of the free-base tetraphenylporphyrins studied, i.e., TArPH 2; Ar = p -X−C 6 H 4, where X = CH 3, H, F, CF 3, and NO 2, when dissolved in trifluoroacetic acid (i.e. when centrally…
The technique of high-temperature oxidation tandem differential mobility analysis has been applied to the study of diesel nanoparticle oxidation. The oxidation rates in air of diesel nanoparticles sampled directly from the exhaust stream of a medium-duty diesel engine were measured over the temperature range of 800-11…
To investigate the luminescent and thermal properties of organic compounds with rigid entities, a series of new blue/purple luminescent bridging ligands, 4,4'-(N-7-azaindolyl)diphenylacetylene (5), 4-(N-7-azaindolyl)-4'-(2,2'-dipyridylamino)diphenylacetylene (6), 4,4'-(2,2'-dipyridylamino)diphenylacetylene (7), and 4,…
Sparse-matrix sampling using commercially available crystallization screen kits has become the most popular way of determining the preliminary crystallization conditions for macromolecules. In this study, the efficiency of three commercial screening kits, Crystal Screen and Crystal Screen 2 (Hampton Research), Wizard…