Materials Literature
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A series of A2B2 four-arm, miktoarm stars of polystyrene and polyisoprene have been synthesized. The morphological behavior of these materials has been characterized using TEM, SAXS, and SANS, and was found to agree in general with the predictions of Milner's theory for miktoarm star morphological behavior. One sample…
Archaeoglobus fulgidus, a hyperthermophilic, archaeal sulfate reducer, is one of the few organisms that can utilize D-lactate as a sole source for both carbon and electrons. The A. fulgidus open reading frame, AF0394, which is predicted to encode a D-(-)-lactate dehydrogenase (Dld), was cloned, and its product was exp…
In this work we report on direct measurements of the temperature and pressure dependences of the low-frequency dielectric constant along c axis $({\ensuremath{\varepsilon}}_{\ensuremath{\parallel}})$ of GaS, GaSe, and InSe. The temperature dependence of both the ordinary and extraordinary refractive indexes is also pr…
This manuscript presents an overview of work directed toward the creation of arbitrary micron-scale patterns of electroactive polymer films by the application of photolithography. A brief overview of work by other groups in the field is followed by a detailed description of work from our own labs which resulted in the…
Treatment of [U(Cp*) 2 Cl 2 ] and [U(COT)X 2 (THF) n ] (Cp* = η 5 -C 5 Me 5; COT = η 8 -C 8 H 8; X = BH 4 and n = 0, X = I and n = 2) with Na 2 dddt (dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate) afforded the (dithiolene)uranium (IV) compounds [U(Cp*) 2 (dddt)] ( 1 ) and [Na(18-crown-6)] 2 [U(COT)(dddt) 2 ] ( 2 ); ox…
Films of Sm–Co have been sputtered on heated polycrystalline Al2O3 substrates. The effect of variations of the Sm content on microstructure and hard magnetic properties was studied for otherwise constant process parameters. As generally observed, the samples possess a magnetic texture where the easy magnetization dire…
Optical absorption and emission intensities are investigated for ${\mathrm{Nd}}^{3+}$ ions in a $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Nd}}^{3+}{:\mathrm{L}\mathrm{a}\mathrm{S}\mathrm{c}}_{3}{(\mathrm{B}\mathrm{O}}_{3}{)}_{4}$ crystal. Oscillator strengths of transition were measured from absorption spectra record…
Multiphoton photoemission spectroscopy of graphite using 267 nm (4.65 eV) and 400 nm (3.1 eV) excitation wavelength reveals spectroscopic features that allow the identification of the multiphoton excitation process and that correspond to the known bulk band structure. In addition, the $n=1$ and $n=2$ image potential s…
The figure of merit for multilayer thermionic refrigeration is discussed in terms of an effective B factor, which has a similar definition as the B factor in thermoelectrics. We show that high efficiencies for cooling or power generation are only obtained with very high values of this B factor. Such high values can on…
Applying a dc electric field across a fused silica sample at elevated temperatures followed by cooling the sample with the field applied (thermal poling) leads to a second-order nonlinearity that has been linked to the formation of a space-charge region in bulk glass. The first microscopic information on the extent of…
Ito, Moynihan, and Angell [Nature 398, 492 (1999)] compared the kinetic and thermodynamic measures of a glassformer’s “fragility.” For the liquids they considered which include molecular, covalent, and ionic substances, thermodynamic fragility and kinetic fragility follow the same order, suggesting that the thermodyna…
Characterization and magnetic properties of Fe–Co(C) nanocapsules were investigated systematically by means of x-ray diffraction, Mössbauer spectroscopy, x-ray photoelectron spectroscopy, transmission electron microscopy, energy dispersive spectroscopy analysis, chemical analysis, oxygen determination, and magnetizati…
We present a first-principles study of the adsorption of a palladium monolayer on the polar MgO (111) surface. On the clean unreconstructed MgO (111) surface, our spin-polarized calculations confirm the existence of partially occupied states in the gap on both oxygen and magnesium terminations. The adsorption characte…
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The thermodynamic behavior of the carbon schwarzite fcc $({\mathrm{C}}_{36}{)}_{2}$ has been studied by tight-binding molecular-dynamics simulations at constant temperature and pressure. The system is totally ${\mathrm{sp}}^{2}$ bonded and it can be represented as a folded graphite sheet made by hexagonal and heptagon…
The heat shock response in alpha proteobacteria is unique in that a combination of two regulators is involved: a positive regulator, RpoH (sigma(32) homolog), found in the alpha, beta, and gamma proteobacteria, and a negative regulator, HrcA, widely distributed in eubacteria but not in the gamma proteobacteria. To ass…
Plasma-enhanced chemical vapor deposition of vanadium pentoxide thin films from a vanadyl(IV) β-diketonate compound has been performed in a low-pressure reactor under different operating conditions. The effect of various parameters, such as the flow rates of the carrier and reactive gas and the substrate temperatures,…
We discuss the electronic properties of ${\mathrm{VO}}_{2}$ in its monoclinic, insulating phase, by comparing the results of quasiparticle band structure calculations obtained within a model $\mathrm{GW}$ scheme with those of both LDA calculations and available experiments. Our calculations are based on the full-poten…
Early stages of crystallization of polymers may be viewed as thermoreversible physical gelation in which molecular connectivity is introduced by crystallization. Effects of shear strain on the early stages of crystallization of a commercial isotactic polypropylene are studied by dynamic mechanical experiments. Shear c…
Absorption and low-frequency Raman-scattering experiments have been performed on thin films consisting of small silver clusters embedded in a porous alumina matrix. When the Raman excitation wavelength is close to the maximum (\ensuremath{\approx}420 nm) of the Mie band (dipolar surface plasmon resonance) the Raman sp…