Materials Literature
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A new pregnane steroid with an unusual formyl group (1) was isolated from the stems of Caralluma umbellata, together with three known steroid compounds. The structure of 1 was elucidated on the basis of spectral evidence including 2D NMR studies.
The correlation between the exciton-phonon interaction and the electrical transport property for the as-grown and annealed ZnO epilayers were investigated. From fitting of the Bose–Einstein approximation using emission parameters extracted from temperature-dependent photoluminescence spectra, it was found that the str…
The synthetic tin-selenium member of the cylindrite structural family, with the empirical formula Sn 31.52 Sb 6.23 Fe 3.12 S 59.12 based on electron-microprobe data, has a triclinic crystal structure composed of two alternating layer types, both with a pronounced one-dimensional modulation, and with a noncommensurate…
Motivated by a recent upsurge in experimental studies of nanoparticles formed by unimolecular crosslinking, we present several models to elucidate the atomic scale processes through which these nanoparticles are formed. Extensive simulations demonstrate that the crosslinking temperature, the polymer chain persistence…
ZrW 2 O 8 is known as a material that shows negative thermal expansion. Amorphous ZrW 2 O 8 with a particle size of 50–300 nm was prepared by a sol–gel process at a lower temperature of 723 K for 12 h. X‐ray diffraction analysis showed that the amorphous ZrW 2 O 8 started to crystallize at 833 K and remained kinetical…
An in situ optical absorbance technique was used to monitor the growth of vertically aligned single-walled carbon nanotubes (VA-SWNTs) at various temperatures and pressures. The effects of the growth temperature and ethanol pressure on the initial growth rate and catalyst lifetime were investigated. It was found that…
Recent magnetic susceptibility measurements for polycrystalline samples of binuclear nitrosyl iron complexes, [Fe2(C3H3N2S)2(NO)4] (I) and [Fe2(SC3H5N2)2(NO)4] (II), suggest that quantum-mechanical entanglement of the spin degrees of freedom exists in these compounds. Entanglement E exists below the temperature T E th…
Radio-frequency noise suppression by using magnetic composite sheets on a microstrip line was studied in the frequency range from 0.5 to 10 GHz. The microstrip line was composed of Cu conductor line and grounded dielectric substrates, which was designed by IEC standard (IEC 62333-2). Fe and NiFe nanopowders were fabri…
The authors present a fabrication process of large-area (1.7×1.7 mm2) dielectric and metal-coated lamellar freestanding gratings structured at the micrometer scale. Both the stress management and the drying problems have been carefully optimized for the fabrication of drilled membranes. Transmission spectra measuremen…
In the case of a hypothetical severe accident in a nuclear pressurized water reactor, the formation of radiotoxic RuO4(g) may occur in the reactor containment building, resulting from the interactions of ruthenium oxide deposits with the oxidizing medium induced by air radiolysis. Consequently, this gaseous ruthenium…
The kinetics of the partial oxidation of isobutane with molecular oxygen on Rh(111) single-crystal surfaces were studied by using a collimated molecular beam under ultrahigh vacuum conditions. Both hydrogen and water were shown to form as primary products, not after secondary reforming or water-gas shift steps as it h…
We report on fabrication of hybrid inorganic-on-organic thin film structures with polycrystalline zinc oxide films grown by atomic layer deposition technique. ZnO films were deposited on two kinds of thin organic films, i.e. pentacene and poly(dimethylosiloxane) elastomer with a carbon nanotube content (PDMS:CNT). Sur…
Here we report the two-step synthesis of high aspect-ratio gold nanorods via combining low pH growth and higher cetyltrimethylammonium bromide concentration. The approach is motivated by the "slow growth principle," which has been demonstrated recently as a effective protocol to prepare high aspect-ratio one-dimension…
This paper deals with the development of a modeling approach for describing the magnetomechanical behavior of magnetostrictive actuators. The model couples the finite element solution, accounting for eddy currents in the magnetic materials, with a modified Preisach-type model, identified starting from the static chara…
The phase separation of a binary fluid can lead to the creation of two horizontal fluid layers with different concentrations resting on a solid substrate and divided by a diffuse interface. In the framework of the Cahn–Hilliard equation, it is shown analytically and numerically that such a layered system is subject to…
Focused electron-beam-induced deposition (EBID) allows the rapid fabrication of three-dimensional nanodevices and metallic wiring of nanostructures, and is a promising technique for many applications in nanoresearch. The authors present two topics on platinum-containing nanostructures created by EBID. First, they repo…
The spectral-luminescence manifestations of the formation of quantum dot (QD)-phthalocyanine complexes as a result of electrostatic interaction have been investigated. Effective QD luminescence quenching has been found in complexes of this type. The luminescence of the molecules associated in complexes with QDs is als…
The behavior of the elastic moduli and sound absorption in a terbium orthoborate single crystal at low temperatures is studied. The components of the tensor of the elastic moduli of this system are determined. A structural phase transition and a transition of the magnetic subsystem into an antiferromagnetically ordere…
The seedlayer effect on crystallographic structure and magnetic properties of cosputtered SmCo films on Cu underlayer was investigated. Highly textured (001) SmCo5 thin films were obtained by introducing a thin Ti or Ta seedlayer. Especially, with the Ta seedlayer, the half maximum of the rocking curve of SmCo (001) p…
A conductive polyaniline/poly(ethylene terephthalate) (PANI/PET) composite film was fabricated via the oxidative graft copolymerization of aniline (ANI) onto the plasma-induced poly(acrylic acid) (PAAc) grafted PET surface. The attenuated total reflectance Fourier transform infrared spectroscopy spectra (ATR-FTIR) and…