Materials Literature
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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…
A novel strategy for the synthesis of a substituted polyaniline that can be switched between a self-doped and non-self-doped state is presented. The approach uses the complexation between boronic acid-substituted aniline, a diol (d-fructose), and fluoride to generate an anionic monomer. Under these conditions, chemica…
Multiferroic laminated composites consisting of lead-zirconate titanate (PZT)/polyvinylidene-fluoride (PVDF) particulate composite layers and Tb-Dy-Fe alloy (Terfenol-D)/PVDF particulate composite layers, prepared by a simple hot-molding technique, were reported. In the laminated composites, the polymer PVDF is inert…
The Langmuir–Blodgett technique has been applied to build optically homogeneous thin films of chemically solubilized single-wall carbon nanotubes (s-SWNTs) which possess good surface spreading properties at the air/water interface. Deposition can be performed in a layer-by-layer fashion up to 100 or more layers either…
Cross-linking of sulfonated poly(ether-ether)ketone-poly(vinyl alcohol) (SPEEK-PVA) materials yields flexible polymer films, possessing high light-sensitivity and ion-exchange capabilities. Adsorbed Ag+ ions are photoreduced in the film under illumination (lambda = 350 nm), leading to metal nanoparticle formation in p…
Enhanced catalytic combustion of methane gas was achieved using novel ceramic support structures. These support structures consist of a three-dimensional lattice of rods, created by a direct fabrication technique (robocasting). The rods (725−1000 μm in diameter) are oriented in such a way as to create no line-of-sight…
Abstract Polypropylene‐based composites were prepared by melt blending with nano‐silica, which was pre‐treated by grafting polymerization onto the surface. Tensile moduli and strengths of the composites were determined as a function of the nano‐silica content and the amount of the grafting polymers chemically attached…
Copper oxide thin films deposited on Si (100) by a filtered cathodic vacuum arc with and without substrate bias have been studied by atomic force microscopy, x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The results show that the substrate bias significantly affects the surfac…