Materials Literature
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A novel series of monodisperse conjugated oligomers were synthesized by inserting varied segments into blue-emitting oligofluorenes to complete the color gamut of light emission. Quantum mechanical calculations revealed that the electron transition dipoles lie largely parallel to the long molecular axes of the central…
This paper reports an experimental study of the NO−char reaction using two types of biomass wheat straw and eucalyptus wood. The experiments were performed in a fixed bed reactor at 1023−1173 K with NO inlet concentrations ranging from 50 to 1500 ppmv. The char was produced in-situ at the reaction temperature, and a s…
Raw electric-arc-produced single-walled carbon nanotubes (SWNTs) were dispersed in organic solvents via a three-step wet chemistry procedure. The soluble sample was purified by continuous dispersion−centrifugation cycles and well-separated SWNTs with high purity were successfully obtained, which enable us to test the…
The first example of a photoactivated probe of intracellular enzymatic activity is described. The caged derivative of a fluorescent protein kinase C peptide-based sensor was prepared by modifying the free hydroxyl group of a phosphorylatable serine moiety with a photolabile appendage that blocks phosphoryl transfer. W…
Water-induced chain dynamics alterations are of paramount importance in many protein-based polymers because they determine and affect to a great extent the temperature dependence of the end properties. In this study, the thermal behavior of the reversible unfolding and refolding of poly(Val-Pro-Gly-Val-Gly) and poly(V…
The antifouling property and biocompatibility of a polyacrylonitrile-based copolymer membrane were improved by the immobilization of poly(ethylene glycol) (PEG) on the membrane surface. The studied membranes were fabricated from poly(acrylonitrile- co -maleic acid), in which the carboxyl groups could be conveniently c…
In our efforts to systematically investigate the effects of the linker units of flexible ligands and other factors on the structures of Ag(I) complexes with thioethers, five new flexible pyridyl thioether ligands, bis(2-pyridylthio)methane (L(1)()), 1,3-bis(2-pyridylthio)propane (L(3)()), 1,4-bis(2-pyridylthio)butane…
Microelectrode voltammetry has been considered to be a powerful technique for single biological cell analysis and brain research. In this paper, we have developed a simple method to get highly sensitive carbon fiber nanoelectrodes (CFNE) modified by single-walled carbon nanotubes (SWNTs) on the basis of our previous w…
Contacting metallic single-walled carbon nanotubes by palladium (Pd) affords highly reproducible ohmic contacts and allows for the detailed elucidation of ballistic transport in metallic nanotubes. The Pd ohmic contacts are more reliable than the titanium (Ti) previously used for ballistic nanotube devices. In contras…
The proximity of two or more porphyrin or chlorin-like structures has been shown to be crucial in numerous biological processes, such as electron transfers. The one-pot electrochemical synthesis of a dimeric tetraphenylporphyrin with one 1,2-(diphenylphosphonium)benzene as a spacer and of its porphyrin-monomer precurs…
We report on a class of icosahedral aluminum--transition-metal (Al-TM) alloys with true semiconducting behavior. Our description of the structure of these icosahedral quasicrystals is based on the six-dimensional Katz-Gratias-Boudard (KGB) model of the face-centered-icosahedral (fci) quasicrystal and its rational appr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTObservation of Four-Phase Lamellar Structure from a Tetrablock Quarterpolymer of the ABCD TypeA. Takano, K. Soga, T. Asari, J. Suzuki, S. Arai, H. Saka, and Y. MatsushitaView Author Information Department of Applied Chemistry, Gradu…
CO-induced changes in the metal/metaloxide interaction of MgO(100)-supported palladium, silver, platinum, and gold in the form of atoms and layers have been investigated within the density functional theory. CO is found to modify the metal/MgO(100) interaction for atoms and one-atom-thick layers. Generally, the bond s…
X-ray anomalous diffraction, together with a band-structure calculation, was employed to obtain a quantitative understanding of the charge-ordering state in a single-crystalline CaFeO3 thin film. The experimental result shows a characteristic energy dispersion of the nearly inhibited reflection at 150 K, implying Fe a…
A set of chlorin-chlorin and oxochlorin-oxochlorin dyads has been prepared with components in the same or different metalation states. In each case a 4,4'-diphenylethyne linker spans the respective 10-position of each macrocycle. The dyads have been studied using static and time-resolved absorption and emission spectr…
We studied the cutting performance of diamond-coated cemented carbide cutting tools pretreated using acid etching, Murakami reagent etching, interlayer addition, and boronization techniques. The Rockwell indentation test indicates that the best adhesion is obtained from the diamond-coated cutting tool pretreated using…
Films of nanocrystals such as Au, Ag and Pd, semiconducting sulphides such as CdS, ZnS and CoS, and oxides such as Fe2O3 and CuO have been prepared by employing reactions at liquid liquid (organic-aqueous) interfaces. In this method, a suitable organic derivative of the metal taken in the organic layer reacts at the i…
Most of the porphyrin-recognition chemistry we have investigated previously has centred on kinetically labile metal-ligand interactions, such as Z-N and Ru-N. Our interest in the broader scope of molecular recognition required a metal with the ability to specifically recognise non-nitrogen-based ligands, with a signif…
We simulate directional solidification using a phase-field model solved with adaptive mesh refinement. For small surface tension anisotropy directed at 45 degrees relative to the pulling direction we observe a crossover from a seaweed to a dendritic morphology as the thermal gradient is lowered, consistent with recent…
We investigate parameters associated with optical data storage in a variety of amorphous side-chain azobenzene-containing polyesters denoted as E1aX. The polyesters possess a common cyano-substituted azobenzene chromophore as a side chain, but differ in their main-chain polyester composition. Seventeen different polym…