Materials Literature
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The simultaneous catalytic reduction of both NO X and N 2 O in excess O 2 using propene as the reductant was studied in the absence and in the presence of 10% H 2 O and 50 ppm SO 2 . Reduction took place in a dual-bed catalytic reactor consisting of In/Al 2 O 3 in the upper layer and of Ru/Al 2 O 3 in the lower one. T…
Optical recording and luminescence readout of novel covalently linked photochrome/luminophore supramolecular complexes has been demonstrated by near-field scanning optical microscopy (NSOM). Localized UV irradiation of these complexes dispersed in polymeric matrices resulted in photoinduced state switching and a conco…
Living polymers formed by reversible association of spacers (oligomers) terminated by one donor and one acceptor group at the ends are studied by means of Monte Carlo simulations (using the bond-fluctuation model). To account for the different chemical nature of the associating groups and spacers, we considered three…
Infrared spectroscopy is used to study trapped and physisorbed CO2 in single-walled carbon nanotube bundles (SWNTs) synthesized by the HiPco process. CO2 is entrapped within the SWNTs by acid oxidation of the unpurified sample followed by vacuum heating to 700 K. The trapped CO2 has a single nu3 mode at 2327 cm-1, is…
The confinement of polymer melts in nanoscopic pores leads to chain dynamics significantly different from bulk behaviour. This so-called 'corset effect' occurs both above and below the critical molecular mass and induces dynamic features as predicted for reptation. The confined-to-bulk dynamics crossover is treated an…
Both hexagonal and cubic films were grown on c -plane (0001) sapphire substrate at low temperature. X-ray diffraction measurements show that the cubic Mg x Zn 1− x O films grow along the [111] direction while the hexagonal ZnO films grow along [0001]. The temperature-dependent optical properties of Mg x Zn 1− x O film…
The first nonaqueous conditions are described for catalytic asymmetric epoxidation mediated by iminium salt organocatalysts, providing ee values of up to 67%.
The production of diphenyl carbonate (DPC) by the transesterification of dimethyl carbonate (DMC) with phenol was performed using a variety of solid catalysts. Mg−Al-hydrotalcite was found to have a high activity for this transesterification. A 14.7% yield of DPC and an 11.6% yield of methylphenyl carbonate (MPC) base…
Na 0.5 Bi 0.5 TiO 3 (NBT) nanowhiskers with diameters of 20 nm and lengths of 300 nm have been prepared at low temperature by using a sol–gel–hydrothermal technique, which combined the conventional sol–gel process and the hydrothermal method. The reaction conditions such as alkali concentration and temperature were in…
An analytical expression for the free energy of solutions of associative polymers is obtained in the entire polymer concentration−temperature range. This expression is derived under assumption that both local intrachain loops as well as interchain associations contribute to combinatorial part of the system free energy…
We investigated the correlation between surface wettability and internal structure of polyelectrolyte (PE)/PE and PE/inorganic multilayer films prepared by the spin self-assembly (SA) method. Spin self-assembled poly(allylamine hydrochloride) (PAH)/poly(sodium 4-styrenesulfonate) (PSS) multilayer films deposited from…
This paper describes a simple surfactant-assisted solvothermal approach to the large-scale synthesis of one-dimensional Sb 2 O 3 nanorods, needle-like fibres, nanobelts and nanotubes. The shape of Sb 2 O 3 nanomaterials can be controlled by the concentration of the reactants and CTAB. The growth mechanism and the fact…
Boron nitride whiskers with a special structure have been synthesized by a thermal reaction process. The as-prepared BN whiskers have a length of tens of micrometers and a mean diameter of 500 nm. High-resolution TEM analysis shows that the as-prepared BN whiskers can be described as a nanofiber-interweaved network. I…
In this paper, the chemical functionalization of multi-walled carbon nanotubes by a fluorinated trichlorosilane ((tridecafluoro-1,1,2,2-tetrahydrooctyl)trichlorosilane) is investigated. The chlorosilane has been shown to react with carboxylic acid moieties, created by an oxidative process on the nanotube walls, as wel…
New developments of the adjustable density matrix assembler (ADMA) approach to macromolecular quantum chemistry are described, based on the original fuzzy density matrix fragmentation scheme combined with an approach of using point charges to approximate the effects of additional, distant parts of a given macromolecul…
Smart surfaces can be described as surfaces that have the ability to respond in a controllable fashion to specific environmental stimuli. A heterogeneous (mixed) polymer brush (HPB) can provide a synthetic route to designing smart polymer surfaces. In this research we study HPB comprised of end-grafted polystyrene (PS…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTThermoreversible Polyesters Consisting of Multiple Hydrogen Bonding (MHB)Koji Yamauchi, Akinori Kanomata, Toshihide Inoue, and Timothy E. LongView Author Information Chemicals Research Laboratories, TORAY Industries, Inc., 9-1, Oe-cho,…
We present a formalism for coupling a density functional theory-based quantum simulation to a classical simulation for the treatment of simple metallic systems. The formalism is applicable to multiscale simulations in which the part of the system requiring quantum-mechanical treatment is spatially confined to a small…
We investigate the macroscopic effects of charge-density waves (CDW) and superconductivity in layered superconducting systems with broken lattice inversion symmetry (allowing for piezoelectricity) such as two-dimensional transition metal dichalcogenides. We work with the low-temperature time-dependent Ginzburg-Landau…
The mode of bonding of CO to Ru-modified Pt(100) surfaces prepared by chemical vapor deposition was investigated using infrared reflection absorption spectroscopy (IRAS) in ultrahigh vacuum (UHV). Spectra recorded in the CO stretching region for freshly prepared Ru(θ Ru ca. 0.52)/Pt(100) exposed to saturation coverage…