Materials Literature
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5,15-substituted porphyrins are valuable compounds in bioorganic and materials chemistry. A new synthesis has been developed that employs 1,9-diformylation of a dipyrromethane, conversion of the diformyldipyrromethane to the bis(imino) derivative, and reaction of the bis(imino)dipyrromethane + a dipyrromethane to give…
Self-exchange of isotopically labeled polycarboxylic acid within a polyelectrolyte multilayer proceeds to completion and is reversible. Similar exchange with poly(styrene sulfonate), which forms nonlabile polyelectrolyte complexes, is slow and irreversible but is facilitated by polyvalent ion pairing interventions of…
A model of two-stage semiconductor thermoelectric refrigerators with external heat transfer is proposed. The performance of the refrigerator obeying Newton’s heat transfer law is analyzed using the combination of finite-time thermodynamics and nonequilibrium thermodynamics. Two analytical formulas for cooling load ver…
The crystal structure of a collagen-model peptide [(Pro-Pro-Gly)(9)](3) has been determined at 1.33 A resolution. Diffraction data were collected at 100 K using synchrotron radiation, which led to the first structural study of [(Pro-Pro-Gly)(n)](3) under cryogenic conditions. The crystals belong to the P2(1) space gro…
It is theoretically demonstrated that the electric-field-induced heating of the electron gas in carbon nanotubes can lead to population inversion in the electron subbands, which results in the generation of electromagnetic waves in the terahertz range by hot electrons. This phenomenon can be used for the creation of r…
The electronic properties of amorphous carbon nitride were studied by x-ray-absorption near-edge structure (XANES) and valence-band photoelectron spectroscopy (PES). The nitrogen incorporation was found to induce graphitization, as evidenced by an increase of the sp2 cluster in C and N K-edge XANES spectra. The struct…
We present experimental and theoretical results on the absorption and dispersion of a single-walled carbon nanotube (SWNT) with and without fluorine (F) doping in the frequency range of 0.2–3THz. Under the doping conditions, the power absorption, index of refraction, and the real and imaginary parts of the conductivit…
Systematic investigation of the electronic phase separation on macroscopic scale is reported in the organic Mott system $\kappa$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}$]Br. Real space imaging of the phase separation is obtained by means of scanning micro-region infrared spectroscopy using the synchrotron radiation. The phase s…
Abstract By precipitation with ammonia of ethanolic solutions containing the appropriate proportions of gallium and aluminium nitrate, following by calcination of the resulting gels at 773 K, mixed Ga 2 O 3 /Al 2 O 3 oxides having Ga:Al ratios of 9:1, 4:1, 1:1, 1:4 and 1:9 were obtained. Powder X‐ray diffraction showe…
Antibody-antigen binding events at a monolayer protein concentration have been demonstrated on nanostructured adaptive silver films (ASFs) using surface-enhanced Raman scattering (SERS) and luminescence-based assays. It is shown that proteins stabilize and restructure the ASF to increase the SERS signal while preservi…
Abstract A new supramolecular complex of a perfluoro‐tagged palladium phosphine catalyst to a dendritic core‐shell architecture with a perfluoroalkyl shell was used as recoverable catalyst for Suzuki couplings. This homogeneous complex can also serve as a model for related catalysts adsorbed on fluorous silica gel.
PURPOSE: To evaluate the in-vivo pharmacokinetics of magnetic resonance imaging (MRI) contrast agents, the excretion of zinc and copper via urine was studied for three gadolinium (Gd) chelate complexes. MATERIALS AND METHODS: Urine samples were taken before, three hours, and six hours after intravenous administration…
Article Application of polymeric multilayers of starch onto wood fibres to enhance strength properties of paper was published on August 1, 2005 in the journal Nordic Pulp & Paper Research Journal (volume 20, issue 3).
We report the thermal conductivity κ and specific heat C measurements down to 0.3 K on single-crystalline samples of n -type Sr 8 Ga 16 Ge 30 and p -type Ba 8 Ga 16 Ge 30 clathrates. The overall temperature dependence of κ( T ) of both samples with a plateau at about 20 K and a quadratic T dependence below 1 K is well…
Au colloids were used to fabricate nanoscale-tunable Au nanofilms on silicon for surface-enhanced IR absorption bases in both ambient and electrochemical environments. This wet process incorporates the self-assembly of colloidal Au monolayer using 3-aminopropyl trimethoxysilane as the organic coupler with subsequent c…
Pseudomonas putida CA-3 is capable of accumulating medium-chain-length polyhydroxyalkanoates (MCL-PHAs) when growing on the toxic pollutant styrene as the sole source of carbon and energy. In this study, we report on the molecular characterization of the metabolic pathways involved in this novel bioconversion. With a…
Carbon nanotubes have drawn tremendous interest due to their excellent mechanical and electronic properties. Carbon nanotubes have a similar molecular structure as that of graphene sheets. Hence, characterization of mechanical properties of graphene sheet based on equivalent continuum modelling is of considerable impo…
The electrical properties of single-walled carbon nanotubes (CNT) are of intense interest due to applications in nanoelectronics. Cyclic voltammetry and chronoamperometry have been used to explore the Ru(bpy)32+ electrocatalytic oxidation of DNA-solubilized carbon nanotubes. Dramatic current enhancements are observed…
We have investigated theoretically the inception mechanism and growth of the damage inside the insulation system of a polymeric cable under working conditions. We focused, in particular, our attention on damage originating from microscopic defects such as voids. In order to clarify the implications of these defects fo…
Transparent p-type copper aluminum oxide (Cu–Al–O) semiconducting thin films, with Cu∕Al atomic ratios ranging from 1.0 to 4.3, were deposited by plasma-enhanced metal-organic chemical-vapor deposition. The films were grown on z-cut single-crystal quartz substrates, at a substrate temperature of 450°C. Crystalline CuA…