Materials Literature
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Future X-ray astronomical missions will need to address a number of important goals such as studying the dynamics of clusters of galaxies, determining how elements are created in the explosions of massive stars, and revealing most of the "normal" matter in the universe which is currently thought to be hidden in hot fi…
As a continuous work to find more epothilone congeners produced by the epothilones A and B producing Sorangium cellulosum strain So0157-2 in the large-scale fermentation (5000 L), we reinvestigated the chemical compositions of the fermentation broth. Consequently, two new epothilone variants (1-2) and one new natural…
A protecting group Ph2P(O) for terminal ethyne was newly developed. This protecting group can be introduced readily to terminal ethyne by CuI-catalyzed phosphination and subsequent oxidation with H2O2. Ph2P(O)-protected ethynes remained intact in Sonogashira coupling, and their high polarity enabled easy separation of…
We report the synthesis and crystallographic studies of paddlewheel-based methyl cobaloxime assembly formed from methyl cobaloxime, isonicotinic acid, and Zn(NO(3))(2). The cobaloxime units are assembled over two-dimensional metal-organic polyhedra constructed from isonicotinate and Zn metal ions.
Abstract: In this paper, a novel amperometric phenol biosensor with immobilization of polyphenol oxidase (tyrosinase) on electrochemically polymerized polypyrrole-polyvinylsulphonate (PPy-PVS) film has been accomplished via the entrapment technique on the surface of a platinum electrode. The amperometric determination…
We constructed a metallic grating on a deep-subwavelength scale and tested its plasmonic features in visible frequencies. The deep-subwavelength metallic grating effectively acts as an anisotropic homogeneous uniaxial form-birefringent metal, exhibiting different optical responses for polarizations along different opt…
In this paper, we investigate the ageing process and composition of plain trimethylsilane (TMS) plasma-polymerized films using a rotating polarizer and analyzer spectroscopic ellipsometer. Moreover, x-ray photoelectron spectroscopy (XPS) depth profiling studies on these films will be presented for a more detailed unde…
This paper reviews spin-transfer magnetization switching in ordered alloy-based nanopillar devices. L10-ordered FePt was used for one of the earliest demonstrations of spin-transfer switching in perpendicularly magnetized systems. The behaviour of magnetization switching deviates from the predictions based on a macro-…
TlBr is a material of interest for use in room temperature gamma ray detector applications due to is wide bandgap 2.7 eV and high average atomic number (Tl 81, Br 35). Researchers have achieved energy resolutions of 1.3 % at 662 keV, demonstrating the potential of this material system. However, these detectors are kno…
Electric-field induced nanolithography (FINL) on four hydrophilic polymer brushes is demonstrated. FINL is a nanoscale surface patterning method that depends on an electrochemical reaction at the tip–brush interface. FINL feature size depends on the applied bias, relative humidity, and exposure time. FINL patterning y…
The lumen degradation and chromaticity shift in glass and silicone based high-power phosphor-converted white-emitting diodes (PC-WLEDs) under accelerated thermal tests at 150°C, 200°C, and 250°C are presented and compared. The glass based PC-WLEDs exhibited better thermal stability than the silicone by 4.8 time reduct…
The formation process and structure of a self-assembled monolayer (SAM) of lipoic-acid-terminated polyproline on a gold surface in aqueous solution were investigated by several techniques. The amount of polyproline molecules on the gold surface was determined from the area of the reductive desorption peak, and orienta…
ASTRO-H is a general purpose X-ray observatory scheduled for launch in 2014. Two soft X-ray telescopes (SXT) and two hard X-ray telescopes (HXT) will be onboard covering energy range of 0.2 -80 keV. Thermal control of the telescope is similar to that of Suzaku, using a thermal shield (TS) placed in front of the telesc…
Metal nanoparticles (NPs), such as gold (Au) and silver (Ag), are important for chemistry, physics, and biology due to their unique optical, electrical, and photothermal properties. Such NPs are widely used for immobilization of various bioactive substances, including peptides, enzymes, antibodies and DNA. The synthes…
Newly designed magnetic-alloy/noble-metal FeCo/Pt nanorods have been first reported and fabricated through a length-controllable catalyzing-synthesis process in which the growth of FeCo nanorods was induced on Pt nanotips. The length of FeCo/Pt nanorods depends on the number of platinum nanotips. The proposed synthesi…
Abstract Permeation of mixtures of butane isomers through 6FDA‐DAM (2,2‐bis(3,4‐carboxyphenyl) hexafluoropropane dianhydride–diaminomesitylene) dense films is shown to deviate from the dual‐mode transport model, even if one accounts for nonideal bulk flow effects. Two hypotheses are proposed to explain the deviations…
Xylose-extracted corncob residue (X-ER), a byproduct from the xylose production industry, is a potential cellulose-rich energy resource. However, attempts to achieve large-scale production of cellulosic ethanol using X-ER have been unsatisfactory due to a lack of understanding of the substrate. This study presents the…
We present calculations on the implementation of attosecond nanoplasmonic streaking (APS) spectroscopy on isolated nanoparticles. APS spectroscopy might enable a remote measurement of plasmonic field oscillations in the optical regime with sub-cycle temporal resolution, where plasmons are excited by a few-cycle near-i…
High quality Pr${}_{0.7}$Ca${}_{0.3}$MnO${}_{3}$/SrRuO${}_{3}$ superlattices were fabricated by pulsed laser deposition. The SrRuO${}_{3}$ layers grew either in orthorhombic or tetragonal symmetry depending on the thickness of the Pr${}_{0.7}$Ca${}_{0.3}$MnO${}_{3}$ layers. Since the Pr${}_{0.7}$Ca${}_{0.3}$MnO${}_{3}…
To explore the influencing effect of different transition metal ions on the coordination geometries and structural architectures of metal–organic complexes with the same ligand, 10 new coordination compounds of a monobranched tripodal ligand N -[ N ′-(carboxymethyl)benzimidazol-2-ylmethyl]- N, N -bis(benzimidazol-2-yl…