Materials Literature
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Arrays of multi-walled carbon nanotubes (MWCNTs) were fabricated by pyrolysis of iron phthalocyanine (FePc). A silicon wafer and a stainless steel plate were used as the substrates. MWCNTs grown on the silicon wafer were packed closely to each other and were thus well aligned, while those grown on the stainless steel…
Highly dense piezoelectric ceramics of tungsten bronze-type (Sr 1.9 Ca 0.1 ) 1-0.5 x Ba x NaNb 5 O 15 (where x =0.1–0.8) were prepared by spark plasma sintering. The crystallographic parameters, dielectric behaviors and piezoelectric properties of the sintered ceramics were investigated, and the effects of the Ba subs…
Abstract The crystallization and melting behavior of bisphenol A polycarbonate treated with supercritical carbon dioxide (CO 2 ) has been investigated with differential scanning calorimetry. Supercritical CO 2 depresses the crystallization temperature ( T c ) of polycarbonate (PC). The lower melting point of PC crysta…
Abstract Ramie yarns were treated with various concentrations of NaOH at room temperature and subsequently crosslinked with 1,2,3,4‐butanetetracarboxylic acid (BTCA). The microstructure and tensile properties of the treated yarns were characterized. X‐ray diffraction (XRD) and FTIR were used to study the crystalline s…
Epitaxial ZnO films have been grown on Si(111) substrates by molecular beam epitaxy using oxygen plasma. An initial Zn layer deposition followed by its oxidation produces a superior template for the subsequent ZnO growth and a low-temperature ZnO buffer layer improves the structural and optical properties of ZnO films…
The use of nanosphere lithography to construct two-dimensional arrays of polystyrene (PS) particles coated with multilayered polyelectrolyte (PE) shells and truncated eggshell structures composed of PE thin layers is reported. The truncated eggshell PE structures were produced by extraction of the PS particle cores wi…
We measured and analyzed the electrical resistivity (ρ), Hall coefficient ( R H ), Seebeck coefficient ( S ) and magnetic susceptibility (χ) of γ-phase Na 0.6 CoO 2 and α-phase Na 0.9 CoO 2 crystals prepared by solution growth using NaCl-Na 2 CO 3 -B 2 O 3 fluxes. The ρ of α-phase Na 0.9 CoO 2 (ρ α ) is much higher th…
The CO 2 −CH 4 reaction on Rh/Al 2 O 3 was studied by in situ infrared spectroscopy coupled with pulse and step transient techniques. Steady-state isotopic 13 CO transient studies at 773 K and 0.1 MPa show that the formation of gaseous 13 CO 2 closely follows that of linear 13 CO, indicating that linear CO is an activ…
In a supermolecular system, the sum of properties is more than that of the individual components. The combination of rod and disc shaped groups (see picture) in the right ratio allows the design of a material with nematic and several layered (smectic) phases. Shape-induced nanophase segregation of rods and discs leads…
The behavior of fluorinated surfactant F(CF2)8C2H4(OC2H4)9OH in water solution was investigated, and the preparation ofmesoporous molecular sieves was achieved. A direct micellar phase (L1) and a hexagonal (H1) liquid crystal were found. Small-angle X-ray scattering measurements proved that the hydrophobic chains are…
We describe two strategies for tackling the equilibrium statistical mechanics of inhomogeneous colloid—polymer mixtures treated in terms of the simple Asakura—Oosawa—Vrij (AO) model, in which colloid—colloid and colloid—polymer interactions are hard-sphere like, whereas the polymer—polymer interaction is zero (perfect…
Ultrafine particles of various metals [Cr, Mn, Fe, Al, Ni, Cu, In, Si, Ge, Zn, Mg and Sn], produced by the gas evaporation method were covered with the oxide layer of thickness less than 10 nm by exposure to air. In order to clarify the structure and thickness of the surface oxide layer on various metal ultrafine part…
Abstract The instantaneous elastic recoveries of poly(trimethylene terephthalate) (PTT), PET, and PBT filaments were comparatively analyzed by a tensile testing machine. The conditions of the measurement were studied and the mechanism of instantaneous elastic recovery of these three aromatic polyester filaments is dis…
Polypyrrole (Ppy) was prepared by a photoelectropolymerization technique using different current densities on Ru-dye sensitized titanium dioxide nanoporous films. Solar cells were constructed using gold as the counter electrode with Ppy acting as the hole conductor and current–voltage characteristics were measured rev…
Abstract Poly(methyl vinyl ether‐ co ‐maleic anhydride) formed films from aqueous formulations with characteristics that are ideal as a basis for producing a drug‐containing bioadhesive delivery system when plasticized with a monohydroxyl functionalized plasticizer. Hence, films containing a novel plasticizer, triprop…
Zwei Arten von Aromatizität: Experimentellen und theoretischen Ergebnissen zufolge haben acht- und neunatomige Borcluster die Struktur vollständig planarer molekularer Räder mit einem sieben- bzw. achtfach koordinierten Boratom im Zentrum (siehe Bild, B grün). Die Radien dieser „Miniräder“ liegen zwischen 1.8 und 2.0…
A new class of crystalline inclusion complexes of a multiarm hyperbranched polyether combined with various cyclodextrins (CDs) was successfully prepared. Using self-condensing ring-opening polymerization, a kind of multiarm polyether with a hyperbranched poly(3-ethyl-3-oxetanemethanol) core and multiple linear poly(et…
(1- x )(Na 1/2 Bi 1/2 )TiO 3 – x BaTiO 3 ( x =0.06) with 0–5 at.% lanthanum was prepared by the conventional mixed oxide method. The effect of La 3+ doping on dielectric and piezoelectric properties of the ceramics was studied. The ceramics' relaxor behavior is more distinct after La 3+ doping. At room temperature, th…
A sputter-deposited SmCo 5 thin film with perpendicular magnetic anisotropy has been developed. The Sm–Co film, composed of [Co (0.41 nm)/Sm (0.31 nm)] 35 , was prepared by sputtering on a Cu (100 nm)/glass substrate at various substrate temperatures. The coercivity was found to increase rapidly at 325–345°C and to be…
This work elucidates the basic mechanisms active in microstructure and the associated surface energy for a widely used bioinert ceramic, magnesia partially stabilized zirconia (MgO–PSZ) following CO2 laser treatment. CO2 laser irradiation results in rapid heating of the surface and consequently leads to the surface de…