Materials Literature
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We present high-energy spectroscopy results on the occupied and unoccupied electronic structures of the strongly anisotropic compounds ${\mathrm{MoO}}_{3}$ and ${\mathrm{K}}_{0.3}{\mathrm{MoO}}_{3}$ near the Fermi level. X-ray photoemission reveals a close similarity of the valence-band spectra in both materials. The…
Small-angle X-ray scattering (SAXS) and differential scattering calorimetry (DSC) were used to demonstrate distinct differences in domain size, phase separation, and hydrogen bonding in a series of segmented urethaneurea elastomers prepared from isocyanate-terminated prepolymers and aromatic diamine chain extenders. T…
Atomic-layer epitaxy (ALE) processes of ZnSe on GaAs(001) have been studied using reflection high-energy electron diffraction (RHEED), total reflection-angle x-ray spectroscopy, and x-ray photoelectron spectroscopy. We have obtained direct evidence that the growing surface of ZnSe(001) changes its chemical composition…
The thermoelectric figure of merit ZT of Hg1−xCdxTe superlattices (SLs) having currents along the growth axis is computed using a realistic SL band structure and the multisubband Boltzmann equation. For a narrow well and wide barrier, a heavy C1 and higher-lying light C2 subband combine to form a (nonoptimal) carrier-…
Neutron diffraction spectra were obtained during various stages of a reversible stress-induced austenite to martensite phase transformation in superelastic NiTi. This was accomplished by neutron diffraction measurements on bulk polycrystalline NiTi samples simultaneously subjected to mechanical loading. Analysis of th…
Faraday and magneto-optical Kerr effect has been used for the investigation of the band alignment as well as of the magnetic properties of epitaxial layers of the ternary alloy system ${\mathrm{Pb}}_{1\ensuremath{-}x}{\mathrm{Eu}}_{x}\mathrm{Te}$ $(0<~x<~1)$ grown on ${\mathrm{BaF}}_{2}$ substrates. Due to the w…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and Properties of New Soluble Polyamides Derived from 2,2'-Dimethyl- 4,4'-bis(4-carboxyphenoxy)biphenylDer-Jang Liaw, Been-Yang Liaw, Jun-Rong Chen, and Chao-Min YangView Author Information Department of Chemical Engineering, National Taiwan University of Science and…
The chemical structure and bonding of the hypermetallic Al5C and Al5C− species have been studied by photoelectron spectroscopy and ab initio calculations. Both Al5C (C2v, 2A1) and Al5C− (C2v, 1A1) are found to have planar structures that can be related to that of the planar square Al4C− by adding one Al+ ion or one Al…
The coenzyme B(12)-dependent isobutyryl coenzyme A (CoA) mutase (ICM) and methylmalonyl-CoA mutase (MCM) catalyze the isomerization of n-butyryl-CoA to isobutyryl-CoA and of methylmalonyl-CoA to succinyl-CoA, respectively. The influence that both mutases have on the conversion of n- and isobutyryl-CoA to methylmalonyl…
Resonant soft-x-ray emission spectroscopy was measured on ${\mathrm{La}}_{x}{\mathrm{Sr}}_{1\ensuremath{-}x}{\mathrm{TiO}}_{3}$ $(x=0,0.05,0.10)$ in the $\mathrm{Ti}2p$ energy region. At the Raman scattering of the ${e}_{g}$ resonance, the $d\ensuremath{-}d$ transition whose Raman shift has an energy value of about 2.…
We present tight-binding-based simulations of the scanning tunneling spectroscopic signal of different types of carbon nanotubes. Capped, finite, and connected nanotubes have been investigated. We have computed scanning tunneling spectroscopy (STS) maps of each nanotube on different parts of the systems for various ti…
We investigate the influence of tube-tube interactions in ropes of (10,10) carbon nanotubes, and find that these effects induce a pseudogap in the density of states (DOS) of the rope of width 0.1 eV at the Fermi level. In an isolated $(n,n)$ carbon nanotube there are two bands that cross in a linear fashion at the Fer…
We report observation of coherent quantum oscillations in spin-10 Fe 8 molecular clusters. The powder of magnetically oriented Fe 8 crystallites was placed inside a resonator, in a dc magnetic field perpendicular to the magnetization axis. The field dependence of the ac-susceptibility was measured up to 5 T, at 680 MH…
The structure of lamellar phases of symmetric AB diblock copolymers in a thin film is investigated. We quantitatively compare the composition profiles and profiles of individual segments in self-consistent field calculations with Monte Carlo simulations in the bond fluctuation model for chain length N=32 and χN=30. Th…
Electron paramagnetic resonance was measured in ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{A}\mathrm{s}/\mathrm{G}\mathrm{a}\mathrm{A}\mathrm{s}$ epilayers with $0.002<~x<~0.01.$ Data were taken as a function of magnetic field orientation at low temperatures. The observed spectra were attributed t…
Structural and optical properties of photocrystallized Se films have been studied using x-ray diffraction (XRD), spectroscopic ellipsometry (SE), and ex situ atomic force microscopy (AFM) techniques. The amorphous $(a\ensuremath{-})$ Se films used are deposited by vacuum evaporation on glass substrates at 300 K. Photo…
The action spectra for the photoinduced insulator-metal transition in ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ were investigated in the $0.45\ensuremath{-}3.05 \mathrm{eV}$ range. The photon-density threshold for the transition exhibits a gaplike behavior at $\ensuremath{\sim}0.4 \mathrm{e…
The hydrogen bonds in films of the polyurethane and the core-shell type polyacrylate-polyurethane microemulsions have been studied by FTIR spectroscopy in the regions of NH absorption and CO absorption. The effects on hydrogen bonds of the composition, the core-shell ratio were revealed. At the same time, the relati…
The surface structure of the ring-banded spherulites in polymer blends PCL/SAN (90/10) was studied by optical microscopy, SEM, and TEM, respectively. It is interesting to find that the surface structure of the ring-banded spherulites in polymer blends PCL/SAN (90/10) is made up of the convex bands. The landscape of th…
We present ab initio total energy calculations of the adsorption energy of one Pd monolayer on ${\mathrm{MoS}}_{2}(1000).$ We consider four different adsorption sites: the Pd atoms on top of Mo, on top of the hole site, on top of the surface S, and on the bridge position halfway between two adjacent S atoms. The large…