Materials Literature
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In this work we present a prospective study on the possible use of certain quasicrystalline alloys in order to improve the efficiency of segmented thermoelectric generators. To this end, we obtain a closed analytical expression for their compatibility factor [G. J. Snyder and T. S. Ursell, Phys. Rev. Lett. 91, 148301…
Ba ( Co x , Ti 1 − x ) O 3 thin films were prepared on fused quartz substrate by a sol-gel method. The results of x-ray diffraction showed that the films are perovskite phase and the change of lattice constant caused by different Co concentration is undetectable. Optical transmittance measurement indicated that Co dop…
Abstract The degradation of PI film irradiated with VUV in a wavelength of 5 to 200 nm is investigated. The results show that transparency of PI film decreases obviously after irradiation and more obviously for the film irradiated with VUV of higher intensity. In addition, the absorption line red‐shifts for the PI fil…
Using in situ high-pressure x-ray diffraction methods, the compressibility of 30nm 3C–SiC nanocrystals was studied under hydrostatic conditions while helium was used as pressure transmitting medium, as well as under nonhydrostatic conditions without pressure medium. No threshold pressure phenomenon was observed for th…
Abstract Latex based on fluoroacrylate (TAN) and other comonomers was prepared via miniemulsion polymerization in the presence of stearyl trimethyl ammonium chloride (STAC) and 2, 2′‐azobis (2‐amidinopropane) dihydrochloride (ABAP) as a water soluble initiator. Light transmittance studies demonstrated that the light t…
For a deeper insight into the structure of Bombyx mori silk fibroin, some model peptides containing tyrosine (Y), valine (V), and serine (S) in the basic (AG)n sequence were synthesized by the solid-phase method and analyzed by Raman spectroscopy in order to clarify their conformation and to evaluate the formation and…
The blueshift of the optical absorption edge along with the intense red photoluminescence (PL) peak has been observed from micron-long crystalline silicon nanowires prepared by pulsed-laser vaporization of heated Si (mixed with metal catalyst) targets. Previous studies on the confinement in silicon nanostructures resu…
Aluminum-induced layer exchange (ALILE) was used to crystallize amorphous silicon–germanium (a-Si1−xGex) alloys. A bilayer structure of aluminum (Al) and a-Si1−xGex was deposited on quartz substrates and annealed below the eutectic temperature of the binary Al–Ge alloy (420°C). The annealing process results in an almo…
Abstract Summary: Polyaniline nanobelts have been synthesized by a self‐assembly process using the chemical oxidative polymerization of aniline in a surfactant gel. The morphologies of polyaniline nanostructures were characterized by field‐emission scanning electron microscopy and transmission electron microscopy. The…
Using a nanomanipulation system contained within a scanning electron microscope we investigate the thermionic electron emission from multiwall carbon nanotubes. Peak emission currents of 65nA are measured. The carbon nanotubes being grown at low temperature by the chemical vapor deposition method are defective with po…
Abstract The vulcanization characteristics of silica‐filled natural rubber (NR) were studied in the presence of silane coupling agents, 3‐octanoylthio‐1‐propyltriethoxysilane (NXT) and bis [(3‐triethoxysilylpropyl) tetra sulfide] (TESPT, or Si‐69). The scorch time, cure rate index, and the rate constant of NR were mea…
We investigated single-wall carbon nanotubes filled with lead oxide, PbO, by transmission electron microscopy and Raman spectroscopy. It is concluded that PbO crystallizes in the orthorombic phase forming nanowires inside the nanotubes. The positions of the PbO Raman lines are downshifted as compared to the bulk mater…
Abstract Summary: Several different series of cellulose acetate‐ graft ‐poly(hydroxyalkanoate)s (CA‐ g ‐PHAs) were synthesized over a wide range of compositions by the graft copolymerization of lactic acid, L ‐lactide, ( R , S )‐ β ‐butyrolactone, δ ‐valerolactone and ε ‐caprolactone onto the residual hydroxyl positio…
Abstract A poly(ethylene terephthalate) (PET)/montmorillonite clay nanocomposite was synthesized via in situ polymerization. Microscopic studies revealed that in an isothermal crystallization process, some crystallites in the nanocomposite initially were rod‐shaped and later exhibited three‐dimensional growth. The cry…
Nitrogen-doped carbon nanotubes ($\mathrm{N}$-doped $\mathrm{CNTs}$) were synthesized by exposing $\mathrm{CNTs}$ under high input power nitrogen plasma $(3.1\phantom{\rule{0.3em}{0ex}}\mathrm{kW})$, using a microwave plasma enhanced chemical vapor deposition system. In the analysis of high resolution transmission ele…
BACKGROUND: Identification of effective systemic antineoplastic drugs against anaplastic thyroid carcinomas has particularly important implications. In fact, the efficacy of the chemotherapeutic agents presently used in these tumours, is strongly limited by their low therapeutic index. METHODS: In this study gemcitabi…
The saturation magnetic moment Ms and the Curie temperature TC of the half-metal-type Co2CrGa Heusler alloy have been investigated. The value of Ms at 4.2K for the L21-type Co2CrGa alloy is 3.01μB∕f.u., in agreement with the generalized Slater-Pauling line and the theoretical calculation. The Curie temperature TC and…
Abstract Much research related to the use of natural fibers in polymeric matrix composites has been developed. The presence of OH groups in the chemical components of the natural fibers generates an important hydrophylic tendency that produces adhesion lacks with hydrophobic polymeric matrices. In this work natural f…
Single ZnO nanorods with diameters of ∼130nm were grown on Au-coated Al2O3 substrates by catalyst-driven molecular beam epitaxy. Individual nanorods were removed from the substrate and placed between Ohmic contact pads and the current–voltage characteristics measured as a function of temperature and gas ambient. In th…
We report photoconductivity at infrared wavelengths, 975–1300nm, from a polymer∕nanocrystal quantum dot composite. Biased films of the conjugated polymer poly[2-methoxy-5-(2′-ethylhexyloxy-p-phenylenevinylene)] (MEH-PPV) sensitized with PbS nanocrystals (∼5nm diameter) demonstrate photocurrent at wavelengths beyond th…