Materials Literature
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Wet, wetter, wettest: The surface wettability of copper films can be controlled between superhydrophobicity and superhydrophilicity by micro- and nanoscale hierarchical structures and self-assembled monolayers of alkanoic acids. The picture shows the shapes of water droplets on films prepared with different acids and…
The bis(μ-hydroxo)-bridged dioxovanadium site in [γ-1,2-H2SiV2W10O40]4− catalyzes the epoxidation of alkenes in the presence of only one equivalent of H2O2 with a high yield of epoxide, high efficiency of H2O2 utilization, unusual regioselectivity, and unprecedented diastereoselectivity (see picture).
We demonstrate that annealing of a vicinal Si(111) surface at about 800 C with a direct current in the direction that ascends the kinks enhances the formation of atomically straight step edges over micrometer lengths, while annealing with a current in the opposite direction does not. Every straight step edge has the s…
Silicon self-assembly at step edges in the initial stage of homoepitaxial growth on a vicinal Si(111) surface is studied by scanning tunneling microscopy (STM). The resulting atomic structures change dramatically from a parallel array of 0.7 nm wide wires to one dimensionally aligned periodic clusters of the diameter…
We have studied terahertz (THz) emission from arsenic-ion implanted GaAs both experimentally and using a three-dimensional carrier dynamics simulation. A uniform density of vacancies was formed over the optical absorption depth of bulk GaAs samples by performing multi-energy implantations of arsenic ions (1 and 2.4MeV…
Ab-initio self consistent field calculations using double zeta Gaussian basis set expansions were performed on conformers of Dimethoxymethane and Dimethoxyethane. The gauche-trans energy differences using the rigid rotor approximation were calculated.
Size-controlled nanocrystalline silicon ( nc - Si ) has been prepared from a - SiN x / a - Si:H/a - SiN x ( 'a' standing for amorphous) sandwich structures by thermal annealing. Transmission electron microscope analyses show that the mean size and the grain size distribution (GSD) of the nc - Si are controlled by the…
This paper describes the current results from a program of work carried out at TNO Defence, Security and Safety (formerly known as TNO Prins Maurits Laboratory), The Netherlands. To investigate ageing, a series of analogue motors were cast containing Micron DBST sensors to measure bond stress and chemical sensors to m…
The loss of the Space Shuttle Columbia highlighted concerns about the integrity of the Shuttle's thermal protection system, which includes Reinforced Carbon-Carbon (RCC) on the leading edge. This led NASA to investigate nondestructive evaluation (NDE) methods for certifying the integrity of the Shuttle's wing leading…
This paper describes results of a numerical analysis evaluating the feasibility of high-temperature shape memory alloys (HTSMA) for active clearance control actuation in the high-pressure turbine section of a modern turbofan engine. The prototype actuator concept considered here consists of parallel HTSMA wires attach…
Copper catalysts for complete oxidation of hydrocarbons supported on natural zeolites of different structure and origin were prepared by ion-exchange procedure. The catalytic experiments demonstrate that the temperature of beginning of hydrocarbons conversion is in the range of 170-300 °C, depending on the composition…
The formation of gold nanoparticles in mordenites has been studied by the methods of FTIR spectroscopy of adsorbed CO and diffuse reflectance UV-visible spectroscopy. Different states of ionic and metallic gold were detected in the zeolite cavities and on the external surface of the zeolite – Au + and Au 3+ ions, char…
Thin films of Cu x S are grown by chemical vapor deposition using Cu(thd) 2 (thd = tetramethylheptanedionate), H 2 S, and H 2 as the precursors. A deposition profile, not caused by depletion of the precursors, is present in all films. Hydrogen is needed for growth to occur; in atomic layer deposition of Cu x S the rea…
Abstract Se@NiSe2 nanocables were synthesized using a procedure that combines self-sacrificing template method and hydrothermal method, in which nanorodes of trigonal selenium served as template. The nickel selenide nanotubes were obtained by appropriate evaporation to remove Se cores.
Beta sheet peptides (e.g., amyloid beta) are known to form ion channels in lipid bilayers possibly through aggregation, though the channel structure is not clear. We have recently reported that a short beta sheet peptide, (xSxG)(6), forms porin-like voltage-gated channels in lipid bilayers [Thundimadathil et al. (2005…
Abstract A successful demonstration of the formation of mesostructural pores in iron phosphate has been reported by using generation 4.0 poly(amido amine) dendrimer as a single molecular template.
The use of surface plasmon resonance (SPR) as a nondestructive, nonerasing readout of the isomerization state of a photochromic dithienylethene covalently linked to a chemically modified gold surface was investigated. Four different binding layers were examined: 11-mercaptoundecanol (MUO), an amine-modified 11-mercapt…
Mesoporous silica microtubules were hydrothermally prepared with tetraethoxysilane (TEOS) as silica source and the supramolecular assembly of β-cyclodextrin and the nonionic surfactant Triton X-100 (TX-100) as the structure-directing agent. The products exhibit a well-developed tubular morphology with diameters betwee…
Abstract We found that Y2Ti2O7 samples prepared by polymerized complex method with excess amounts (5%) of Y showed higher photocatalytic activity for overall water splitting reaction than those prepared with a stoichiometric ratio of Y and Ti (1:1). The excess Y prevented the formation of the impurity TiO2 rutile whic…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTTemplate Polymerization Using Artificial Double StrandsKen-ichi Hamada, Takeshi Serizawa, and Mitsuru AkashiView Author Information Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-00…