Materials Literature
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This paper concerns a relaxation of the assumption of uniform mixture composition in the interior of sonoluminescence bubbles. Intense temperature and pressure gradients within the bubble drive relative mass diffusion which overwhelms diffusion driven by concentration gradients. This thermal and pressure diffusion res…
Results of Monsanto rheometic studies and measurements of physical properties reveal that precipitated silica interacts chemically with epoxidized natural rubber (ENR) during high temperature (180°C) molding and the extent of chemical interaction increases in the presence of silane coupling agent, namely N-3(N-vinyl b…
Interpenetrating polymer networks (IPNs) were prepared from polyurethane (PU)-modified epoxy with different molecular weight of polyol and polyurethanes based on the mixture of polydiol and polytriol by a one-shot method. Two types of PU-modified epoxy: PU-crosslinked epoxy and PU-dangled epoxy were synthesized, and t…
Density functional theory (DFT) and multiconfiguration self-consistent field (MCSCF) calculations on the oxo FeO(4)(2)(-) (Fe(VI)) and the hypothetical oxo FeO(4)(-) (Fe(VII)), and FeO(4) (Fe(VIII)) and peroxo FeO(2)(O-O)(z)() [z = -2 (Fe(IV)), z = -1 (Fe(V)), z = 0 (Fe(VI))], Fe(O-O)(2)(z)() [z = -2 (Fe(II)), z = -1…
Anodic coupling of 5,5‘-bis(3,4-(ethylenedioxy)thien-2-yl)-2,2‘-bipyridine has produced a new ion-coordinating polyconjugated polymer as thin films on electrodes. The polymer has been characterized by cyclic voltammetry, FTIR reflection−absorption, UV−vis spectroscopy, electrochemical quartz crystal microbalance, in s…
γ-Li x V 2 O 5 ( x = 0.9−1) was synthesized at 350 °C. The material was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The synthesis reactions were studied by thermogravimetric analysis (TGA). The composition of γ-Li x V 2 O 5 was determined by atomic absorption spectroph…
Water vapor adsorption/desorption isotherms at 298 K and XRD measurements and nitrogen isotherms at 77 K before and after exposure to water vapor were determined on pure silica MCM-41 samples; samples had different pore widths and were prepared by different synthesis methods, including hydrothermal and room-temperatur…
Impregnation of hyper-cross-linked polystyrene (HPS) by either Co 2 (CO) 8 in 2-propanol or the [Co(DMF) 6 ] 2+ [Co(CO) 4 ] - 2 complex in dimethylformamide (DMF), followed by thermolysis at 200 °C, results in the formation of discrete Co nanoparticles. The concentration and characteristics of such nanoparticles were…
An effective photochemical route is reported here for size-controlled synthesis of nonaqueous colloidal gold particles in a highly polar and viscous medium, formamide in the presence of poly(vinylpyrrolidone). The effective photoreduction of AuCl 4 - in the nonaqueous system is attributed to the higher degree of disso…
The new biodegradable starch graft copolymer, starch- g -polycaprolactone (PCL), was synthesized by using the ring-opening graft polymerization of a ε-caprolactone (CL) monomer onto starch backbone. The grafting reactions were conducted with various starch/CL/water feed ratios to obtain starch- g -PCL copolymers with…
Steady-state luminescence spectroscopy and luminescence decay analysis have been employed to study the association of two rare earth ions (i.e., Eu 3+ and Tb 3+ ) with poly(ethylene glycol) in the absence and in the presence of 2,2‘-bipyridine, which acted as an antenna of near-UV radiation. Three different systems ha…
We previously demonstrated that metal nanoclusters ranging in size from 1 to 2 nm can be prepared within dendrimer templates. In this two-step synthesis, metal ions (for example, Cu 2+, Pd 2+, and Pt 2+ ) first partition into the interior of, for example, a hydroxyl-terminated poly(amidoamine) (PAMAM) dendrimer, and t…
Nanocomposite materials were prepared from an elastomeric medium-chain-length poly(hydroxyalkanoate) (Mcl-PHA) latex as semicrystalline matrix using a colloidal suspension of hydrolyzed cellulose whiskers as natural and biodegradable filler. After stirring, the preparations were cast and evaporated. High-performance m…
Mesoporous materials have been synthesized that are composed of hybrid frameworks in which inorganic and organic components have a fixed stoichiometry and are covalently bonded. The creation of UOFMN (unified organically functionalized mesoporous networks) materials incorporates concepts employed in the synthesis of M…
A theoretical study of Heisenberg exchange and double exchange interactions in iron–sulphur superclusters is presented. The clusters can play an important role in biological systems (proteins and enzymes) acting as so-called active centers. The cluster with valence 4+ can be modeled by four Fe(III) and two Fe(II) ions…
It is shown that fluids consisting of particles that interact with potentials containing an accessible hard core have elastic moduli at infinite frequency that are infinite in magnitude. A consequence of this is that such a fluid, at any density or temperature, is not viscoelastic as are all real fluids. The viscosity…
Raman spectroscopy of matrix-isolated, mass-selected Fe3 and Ag3 reveal that both are Jahn–Teller distorted triangular molecules. The observed spectrum of Ag3 can be accounted for adequately using an approximate Jahn–Teller potential truncated at the quadratic term [Wedum et al., J. Chem. Phys. 100, 6312 (1994)] with…
This paper describes the characterizations of structural and electrochemical properties of nanoparticle thin films derived by a one-step exchange−cross-linking−precipitation route. While there exists a stepwise layer-by-layer construction method, our motivation stems from seeking an alternative and simpler pathway to…
The superconducting proximity effect in single-walled carbon nanotubes connected to niobium electrodes was controlled with the use of nearby gates that tune the niobium-nanotube transparency. At 4.2 kelvin, when the transparency was tuned to be high, a dip in the low-bias differential resistance was observed, indicati…
p-type doping of molecular-beam-epitaxy grown layers of the diluted magnetic semiconductor Zn(1-x)MnxTe is achieved by using an active nitrogen cell. The strong interaction between the localized Mn spins and the holes deeply modifies the transport properties (metal-insulator transition, spin-dependent Hall effect). In…