Materials Literature
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The electronic structure of Heusler-type Fe(2)VAl has been studied by high-resolution photoelectron spectroscopy with the excitation photon energy hnu ranging from 21.2 eV (the He I laboratory light source) to 904 eV (the soft X-ray synchrotron light source) for clean surfaces prepared by scraping or fracturing polycr…
Structure and Resonant Characteristics of Amorphous Carbon Pillars Grown by Focused-Ion-Beam-Induced Chemical Vapor Deposition, Fujita, Jun-ichi, Ishida, Masahiko, Ichihashi, Toshinari, Sakamoto, Toshitsugu, Ochiai, Yukinori, Kaito, Takashi, Matsui, Shinji
A two-dimensional antireflection subwavelangth-structured (SWS) surface is fabricated on GaAlAs light-emitting diodes (LEDs) and photodiodes. The SWS is patterned by electron beam lithography and etched by fast atom beams of SF 6 and Cl 2 gases. The SWS grating has a conical profile, 200 nm period and 270 nm groove de…
Carbon nanotubes (CNTs) were screen-sprinted on a patterned indium tin oxide (ITO) substrate and irradiated using an ultra violet (UV) laser. The emission characteristics of screen-printed CNTs were tested with a diode structure with a spacer of 125 µm. The electron emission current increased from 10 µA to 300 µA, and…
X-ray radiation damage of lysozyme single crystals by an intense monochromatic beam from the Advanced Photon Source is studied at cryogenic temperatures between 40 K and 150 K. The results confirm that primary radiation damage is both linearly dependent on the X-ray dose and independent of temperature. The upper limit…
The coordination of carbon atoms in diamond-like carbon (DLC) thin films formed by Ar gas cluster ion beam (GCIB) assisted deposition using fullerene as the carbon source was investigated by measuring near-edge X-ray absorption fine structure (NEXAFS) spectra of the carbon K -edge over the excitation energy range 275–…
The results of experimental and theoretical investigations of the phase equilibria in the titanium–carbon system are generalised. The generalised thermodynamic characteristics of disordered titanium carbide TiC y , are reported. Peculiarities of the crystal structures of all the known and hypothetical compounds of tit…
In the present study using a high-intensity X-ray beam from a third-generation synchrotron radiation source, it is demonstrated that a wide-angle X-ray scattering (WAXS) profile from several globular proteins in solution can reflect not only the overall structures (approximately 300 A distance resolution) but also int…
We have observed localized spin-wave modes in individual thin-film ferromagnetic wires using time-resolved Kerr microscopy as a micron-scale spectroscopic probe. The localization is due to the partial demagnetization of a wire when an external field is applied in the plane of the film and perpendicular to the long axi…
Solubility of glucose isomerase (from Streptomyces rubiginosus ) crystals was measured in situ at 0.1 and 100 MPa. An equilibrium temperature of the crystal with the solution of a given concentration was measured using a two-beam interferometer. The solubility of the crystal decreased to about one-ninth with increasin…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPoly(p-phenylene ethynylene) BrushesJoong Ho Moon and Timothy M. SwagerView Author Information Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Cite this: Macromolecules 2002, 35, 16, 60…
Polymer-dispersed liquid crystals (PDLCs), consisting of a dispersion of LC-rich domains in a polymer matrix, are used in different types of electrooptical devices. Their efficiency can in principle be increased if the LC domains exhibit a uniform characteristic size in the range of the wavelength of visible light. In…
The solubility of potassium carbonate in methanol and the acid−base interaction of these compounds with each other have been considered. The reaction results in the formation of methoxide and hydrocarbonate of potassium. The reported values on the solubility of potassium carbonate differ essentially from the data desc…
A backbone-caged sperm-activating peptide (caged speract) that has a 2-nitrobenzyl group at a backbone amide and a vastly reduced affinity for its receptor (IC50=950 nM) was synthesized. UV irradiation of caged speract photocleaves the 2-nitrobenzyl group (tau1/2=26 micros), restoring its affinity (IC50=0.67 nM) and a…
Hydrogen-bonded supramolecular cation assemblies of (NH4+/NH2-NH3+)(crown ether), where the crown ether is [12]crown-4, [15]crown-5, or [18]crown-6, were incorporated into electrically conducting [Ni(dmit)2] salts (dmit2- = 2-thioxo-1,3-dithiole-4,5-dithiolate). (NH4+)([12]crown-4)[Ni(dmit)2]3(CH3CN)2 had a pyramidal…
This paper comprises the text of a review lecture on the subject of the effects of ultrasound upon mass transport, upon electrode surface phenomena, upon the behaviour of species and upon reaction mechanisms, and selected examples of the benefits of insonation in electroanalysis, electrosynthesis, electrodeposition an…
The structural evolution of a 2D hexagonal mesoporous silica powder during nitrogen adsorption at low temperature is followed by X-ray diffraction. The values for the pore radius and wall microporosity obtained with this technique compare well to the estimations drawn from volumetric measurements. It is further shown…
Antimony compounds are widely used as catalysts for the synthesis of the commercially important polymer poly(ethyleneterephthalate) by polycondensation of bis(hydroxyethyl)terephthalate. The precise nature of the antimony catalysts is, however, unknown. The present study has been conducted with a view to determining t…
This report describes the synthesis and supramolecular organization of a novel class of linear−dendritic block copolymers. The molecules, which are termed rodcoil dendrons, consist of a cholesterol moiety that is attached to l -lysine dendrons of three different generations via a biodegradable oligo( l -lactic acid) n…
The positive axial zero-field splitting parameter D relevant for the S = 2 ground state of [Mn(cyclam)I2]I (cyclam = 1,4,8,11-tetraazacyclotetradecane) is interpreted using the valence bond configuration interaction model which explicitly considers the covalency of the manganese-iodide bond.