Materials Literature
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The synthesis of a polyhydroxyalkanoate with medium chain length alkyl substituents by Pseudomonas oleovoranswas investigated using protonated and deuterated forms of octanoic acid in a minimal salts medium. Cultivation with deuterated octanoic acid resulted in a reduced rate of polymer accumulation compared to that w…
Abstract Thermophysical properties of liquid and supercooled tungsten were measured using non‐contact techniques in combination with an electrostatic levitator. Over the 3125–3707 K temperature range, the density measurements can be expressed as ρ ( T ) = 16.7(± 0.33)× 10 3 − 1.08(± 0.08) (kgċ m −3 ) with T m = 3695 K…
The phonon dispersion relations for tetragonal $\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ have been determined along the [100], [110], and [001] directions at room temperature by inelastic neutron scattering. The zone-boundary TA phonon energies for $\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ are considerably lower than th…
Electronic structure and optical spectra of GaAs nanocrystals for a wide range of sizes are studied by using both $s{p}^{3}{s}^{*}$ and $s{p}^{3}{s}^{*}{d}^{5}$ nearest-neighbor tight-binding models. Our results show that the inclusion of $d$ orbitals into a minimal basis set is necessary for a proper description of t…
In this work, we present a novel soft chemical synthesis to aluminum nanoparticles based on the hydrogenolysis of the metastable organoaluminum (I) compound (AlCp*) 4 ( 1 ) in mesitylene at 150 °C and 3 bar H 2 . Aiming at the development of a general wet-chemical, nonaqueous route to M/E intermetallic nanophases (E =…
[reaction: see text] A new dissymmetrical tetrathiafulvalene (TTF) derivative 1 was synthesized as a versatile building block to reach TTF-based donor-acceptor assemblies incorporating C(60) in triad C(60)-TTF-C(60) 2 and/or p-benzoquinone (Q) in fused dyad Q-TTF 3 and triad Q-TTF-C(60) 4.
Cobalt-containing mesoporous materials that have been prepared using different procedures have been comparatively characterized by transmission electron microscopy/energy-dispersive X-ray spectroscopy (TEM/EDS), extended X-ray absorption fine structure spectroscopy (EXAFS), X-ray absorption near edge spectroscopy (XAN…
Abstract Simulations have been carried out on metamaterials in the microwave regime. S ‐parameters obtained from waveguide simulations of a unit cell are used to retrieve the effective permittivity and permeability with which we compute the far‐field radiation of a monopole embedded in a metamaterial substrate using a…
Onconase (ONC) from Rana pipiens is the smallest member of the ribonuclease A (RNase A) superfamily. Despite a tertiary structure similar to RNase A, ONC is distinguished by an extremely high thermodynamic stability. In the present paper we have probed the significance of three structural regions, which exhibit struct…
Summary An edible coating was formed by blending turmeric ( Curcuma longa ) and casein in equal proportions at 95 °C for 12 h. Small quantities of polyvinyl alcohol and propylene glycol were added to encourage film formation and plasticizing respectively. The blend was removed from the reaction vessel and homogenized…
Atherosclerosis is a leading cause of death in the U.S. Because there is a potential to prevent coronary and arterial disease through early diagnosis, there is a need for methods to image arteries in the subclinical stage as well as clinical stage using various noninvasive techniques, including magnetic resonance imag…
Dynamics and microstructure of the surfactant layer in organically modified silicates and their composites with polystyrene were studied as a function of surfactant loading and temperature in the range relevant for melt intercalation. Site selectivity was achieved by using specifically headgroup- and tail-labeled surf…
A monodisperse truncation mutant of MxiH, the subunit of the needle from the Shigella flexneri type III secretion system (TTSS), has been overexpressed and purified. Crystals were grown of native and selenomethionine-labelled MxiH(CDelta5) and diffraction data were collected to 1.9 A resolution. The crystals belong to…
The available models of charge transfer processes in electroactive polymer films are considered. Examples of interpretation of the data of electrochemical measurements using model approaches are given. The emphasis is placed on the interpretation of the results on the impedance of modified electrodes. On this basis, c…
We give the spectroscopic evidence of energy transfer to erbium ions provided by ${\mathrm{SnO}}_{2}$ nanocrystals in silica. The spectral and time resolved analysis of the nanocluster luminescence resonant with ${\mathrm{Er}}^{3+}$ transitions demonstrates that erbium ions take part to energy-transfer mechanisms with…
A mechanism of the thermal and photochemical bleaching of merocyanine to spiropyran is proposed on the basis of CASSCF/CASPT2 calculations on the 6-(2-propenyliden)cyclohexadienone model system. Our results suggest that this photochemical transformation takes place in two steps. First, the initially pumped 1(pi-pi) S2…
Molecular dynamics simulations are employed to obtain the velocity autocorrelation function (VAF) for hard spheres, spanning a wide range of volume fractions from dilute to high-density metastable fluids. For all volume fractions below freezing, Alder's classical positive $3/2$ long-time tail is observed. For volume f…
Individual amorphous carbon nanowires (a-CNWs) were fabricated inside a transmission electron microscope (TEM) by the electron beam induced deposition (EBID) method, and the a-CNWs were graphitized in situ by introducing Fe particles into these a-CNWs and controlled movement of the Fe particles in these CNWs. Detailed…
A positive-microemulsion system (water/sodium linoleate/hexane) was used to make uniform Ag2Se nanoparticles at low temperature (7-10 degrees C) within five to ten minutes. The proposed interface-reaction mechanism was corroborated by transmission electron microscopy (TEM), IR spectroscopy, and X-ray photoelectron spe…
All experimental observations of the uptake of the four title compounds on calcite are consistent with the presence of a reactive bifunctional surface intermediate Ca(OH)(HCO3) that has been proposed in the literature. The uptake of CO2 and SO2 occurs on specific adsorption sites of crystalline CaCO3(s) rather than by…