Materials Literature
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Recent developments in off-lattice self-consistent-field theories for inhomogeneous complex fluids are reviewed. Particular emphasis is given to the treatment of intermolecular interactions and compressibility, to the role of fluctuations, and to the discussion of the coarse-graining length which is inherent to the th…
Using a recently developed algorithm for generic rigidity of two-dimensional graphs, we analyze rigidity and connectivity percolation transitions in two dimensions on lattices of linear size up to L=4096. We compare three different universality classes: The generic rigidity class; the connectivity class and; the gener…
A theoretical study is given of a new type of optical vortex in nonlinear anisotropic media. This is called an ``optical spin vortex'', which is realized as a special solution of the two-component non-linear Schrödinger equation. The existence of spin vortex is inherent in the spin texture that is caused by the anisot…
A variational formulation of the time-dependent linear response based on the Sternheimer method is developed in order to make practical ab initio calculations of dynamical spin susceptibilities of solids. Using gradient density functional and a muffin-tin-orbital representation, the efficiency of the approach is demon…
The density of states in the vicinity of the Fermi level of single-wall carbon nanotubes can be expressed in terms of a universal relationship that depends only on whether the nanotube is metallic or semiconducting. We compare the predictions of this approximate relationship with densities of states calculated using f…
While bulk crystallization from impure solutions is used industrially as a purification step for a wide variety of materials, it is a technique that has rarely been used for proteins. Proteins have a reputation for being difficult to crystallize and high purity of the initial crystallization solution is considered par…
The crystallization, melting behavior, and morphology of a low ethylene content block propylene–ethylene copolymer (BPP) and a high-density polyethylene (HDPE) blend were studied. It was found that the existence of ethylene–propylene rubber (EPR) in BPP has more influence on the crystallization of HDPE than on that of…
The synthesis and characterization of PtS 2 nanoclusters synthesized in AOT/hexanol/heptane inverse micelles are reported. Electron diffraction and optical spectroscopy have been used to characterize these nanoclusters. The electron diffraction results show that the nanoclusters have the same crystal structure as bulk…
The swelling behavior of thermoplastic elastomeric blends of nylon-6 and acrylate rubber (ACM) has been studied in various solvents and oil at different temperatures. The blends, both with and without dynamic vulcanization, show excellent solvents and oil resistance at elevated temperature. The interfacial reaction be…
Ternary metal hydrides containing both an alkali metal and a transition metal can be synthesized by the conversion of a mixture of the alkali-metal hydride and the transition metal in an atmosphere of hydrogen at temperatures between 500 and 800 K. At low hydrogen reaction pressures, only hydrides containing transitio…
Two novel two-dimensional (layered) intermetallic copper selenoantimonates Cu 2 SbSe 3 ·0.5en ( I ) and Cu 2 SbSe 3 ·en ( II ), have been prepared by soft solvothermal reactions of CuCl, SbCl 3, and Se with A 2 Se (A = Na, K) in the presence of ethylenediamine. Single-crystal X-ray diffraction analyses show that both…
Polyethylene terephthalate fibers cords were modified with argon, oxygen, and successive argon/oxygen cold plasmas as a function of treatment time. Plasma treated cords were coated with resorcinol formaldehyde latex, then tested as rubber reinforcing materials. The peel strength was discussed with respect to the polar…
The temperature influence on the thermal degradation products evolved from poly(ethylene terephthalate) (PET) was investigated. The experiments were carried out within the temperature range of 200–700°C in air. The main volatile toxic products and weight losses during thermal degradation of PET were determined. The re…
A ruthenium complex of meso-tetrakis(2,6-dichlorophenyl)porphyrin, [Ru(II)(TDCPP)(CO)(EtOH)], is immobilized into mesoporous MCM-41 molecular sieves; the supported Ru catalyst can effect highly selective heterogeneous alkene epoxidations using 2,6-dichloropyridine N-oxide as terminal oxidant. Aromatic and aliphatic al…
The heteropolyanion [PW 11 O 39 RhCl] 5- ( 1-Cl ) was synthesized by hydrothermal reaction of [PW 11 O 39 ] 7- and RhCl 3 at 150 °C for 20 h. The tetramethylammonium salt of 1-Cl was characterized by elemental analysis, 31 P and 183 W NMR, and solution molecular weight determination by ultracentrifugation (found 2744…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTRhodium−Carbon Bond Formation in Aqueous Solution. Synthesis, Structure, and Reactivity of the Functionalized Heteropolytungstates, [XW11O39RhCH2COOH]5,6- (X = P, Si)Xinyi Wei, Michael H. Dickman, and Michael T. PopeView Author Information Department of Chemistry, Box…
Dielectric, gravimetric, dynamic mechanical, and infrared measurements are reported on the effect of different stoichiometric ratios on the water absorption of diglycidyl ether of bisphenol A (DGEBA), MY720 (Ciba Geigy) cured with stoichiometric variations of triethylenetetramine (TETA), (BDH). Resin samples were prep…
The adsorption of humic acid onto chitin and chitosan has been investigated. The uptake of humic acid from aqueous solution was determined from changes in concentration, as measured by ultraviolet-visible spectroscopy. The decrease in humic acid removal was observed with the increase in pH. A significant uptake of hum…
A series of 5,15-diphenylporphyrinatonickel(II) derivatives containing electron-releasing (Me(2)NC(6)H(4)C&tbd1;C-) and -withdrawing groups [-CHO, -CH=C(CN)(2), -CH=C(CO(2)Et)(2), -CH=CHCHO] in opposite meso positions has been synthesized through the classical formylation, halogenation, Knoevenagel condensation, and p…
Tungsten oxide−zirconia catalysts were prepared by drying powdered Zr(OH) 4 with ammonium metatungstate aqueous solution, followed by calcining in air at high temperature. Characterization of prepared catalysts was performed by using Fourier transform infrared (FTIR), Raman, and X-ray photoelectron spectroscopy (XPS),…