Materials Literature
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Siliceous (SiMCM-41) and aluminosilicate mesoporous molecular sieves (AlMCM-41) with variable framework Si/Al ratios have been used as supports to immobilize manganese 2,2‘-bipyridine (L) complex cations, [MnL 2 ] 2+, via incipient-wetness impregnation or ion exchange with MnL 2 (NO 3 ) 2 in acetonitrile. Electron spi…
The properties of poly(ethylene terephthalate) (PET) and polypropylene (PP) blends and PET/maleic anhydride-grafted PP (MAgPP) reactive blends were investigated. Two blend systems were immiscible based on tan δ measured by dynamic mechanical analyzer (DMA). In case of PET/MAgPP blends, the reaction of ester groups of…
The thermodynamic properties of hard sphere fluids and their glasses, from molecular dynamics simulations, are described within a unified formalism, by expressing the number of configurations of a fluid as a sum, over all its glasses, of the number of configurations of each glass. For pure hard spheres and a mixture t…
LaCrSb 3, a new layered material, crystallizes in space group Pbcm with a = 13.266(3), b = 6.188(1), and c = 6.100(1) Å at 293 K as determined by neutron diffraction. Corrugated CrSb 2 layers are stacked normal to [100] and are separated by La 3+ ions and a nearly square planar Sb layer. Resistivity data indicate meta…
The morphologies of two series of model graft copolymers were studied using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). Both series of materials have monodisperse polybutadiene (PB) backbones and monodisperse polystyrene (PS) graft blocks. In one series there are on average five tri…
The extent of metal−ligand orbital mixing and the degree of electronic coupling between [M(bpy) 2 ] 2+ fragments linked through a redox active 1,4-dihydroxy-2,5-bis(pyrazol-1‘-yl)benzene (p-L) bridge is described, where M is Os or Ru and bpy is 2,2‘-bipyridyl. This is the first reported example of osmium and ruthenium…
Molecular dynamics answers the question “what is ‘liquid’?” by describing the detailed dynamic structure of simulated liquids in the many-dimensional phase space of statistical mechanics. The Lyapunov instabilities of liquid motion reveal collective dynamic modes, quite unlike those of solid state studies, superimpose…
Studies have been carried out on two solvent-dependent structures of Co(NO 3 ) 2 with trans -1,2-bis(4-pyridyl)ethylene (bpee) and their interconversions. X-ray analyses disclose that the molecule obtained in MeOH/CHCl 3 is an infinite ladder structure, [Co(NO 3 ) 2 (bpee) 1.5 ·3CHCl 3 ] n (triclinic P 1̄; a = 10.415(…
The structure of thin films of a symmetric diblock copolymer, P(dS- b -MMA) (dS = perdeuterated styrene, MMA = methyl methacrylate), was investigated near preferential and nonpreferential (neutral) surfaces. Neutral surfaces were achieved at the substrate and air interfaces by localizing random copolymer, P(S- r -MMA)…
A fast flow reactor-quadrupole mass spectrometer coupled with a laser vaporization source is used to study the gas-phase reactions of nickel and nickel oxide cluster anions (Ni x O y -, where x = 1−12 and y = 0, 1, or 2) with nitric oxide. The results indicate that three processes are occurring in the presence of the…
A new class of hybrid redox polyether melts has been prepared by covalent attachment of short polyethylene oxide “tails” to perylene, resulting in highly viscous materials with improved solubility in common solvents ranging from alcohols to toluene. Solid-state voltammetry of the neat, undiluted materials is made poss…
Three new layered phosphates were isolated by employing high-temperature, solid-state reactions. These compounds belong to the A I 2 B II P 2 O 7 family. Na 2 MnP 2 O 7, 1, crystallizes in the triclinic space group P 1̄ (No. 2) with a = 5.316(2) Å, b = 6.580(2) Å, c = 9.409(3) Å, α = 109.65(3)°, β = 95.25(3)°, γ = 106…
Ruddlesden−Popper (RP) phases with the formula (CaO)(CaMnO 3 ) n, where n = 1, 2, 3, and ∞, have been prepared using the Pechini citrate gel process at temperatures as low as 900 °C under flowing oxygen. The compounds were characterized by X-ray powder diffraction, Rietveld profile analysis, thermal gravimetric analys…
Electroactive polymers from 3-(4-fluorophenyl)thiophene, 3-(4-cyanophenyl)thiophene, 3-(4-methylsulfonylphenyl)thiophene, and 3-(3,4-difluorophenyl)thiophene were electrochemically deposited onto carbon paper electrodes from tetramethylammonium trifluoromethanesulfonate (Me 4 NCF 3 SO 3 )/acetonitrile and/or tetraethy…
We report study of recovery dynamics, followed by in-situ resistivity measurement after 100 MeV oxygen ion irradiation, in cold rolled Fe at 300K. Scaling behavior with microstructural density and temperature of sample have been used to establish stress induced defects formed during irradiation as a new type of sink.…
We describe instrumentation that has been constructed at the National Institute of Standards and Technology (NIST) for measurement of the index of refraction of solid materials in the spectral region from 0.5 micrometer to 1000 micrometer using Fourier-transform based spectrophotometers and etalon samples. Preliminary…
Liquid−liquid equilibrium data for the extraction of cyclohexane + benzene + dimethyl formamide with 10, 20, 30, and 50 mass % ethylene glycol were measured. The NRTL equation was used to correlate the experimental data and to predict the phase composition of the quaternary system. The agreement between the predicted…
This paper describes various methods for the construction of trapped mode solutions within wave guides and along diffraction gratings; in the latter case the solutions are often called Rayleigh–Bloch waves. One of the main results is the explicit construction of a number of new trapped mode solutions within a wave gui…
The supramolecular assembly of octyl-, hexadecyl-, and benzyl-substituted complementary tectonics based upon barbiturates (BA) and 2,4,6-triaminopyrimidines (TP) were studied in bulk, in cyclohexane, and in a polypropylene matrix. As evidenced by means of wide-angle X-ray scattering, FTIR spectroscopy, and atomic forc…
Tris(2-mercaptobenzyl)amine, S 3 N, and tris(2-hydroxybenzyl)amine, O 3 N, were investigated with In 3+ and Ga 3+ in solution and in the solid state to help interpret the contrasting in vivo behavior of their complexes as diagnostic imaging probes. To this end the protonation and metal binding constants were determine…