Materials Literature
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We have successfully grown Bi2Te3 thin films on CdTe(111)B using molecular-beam epitaxy. Structural and transport properties have been investigated using in situ reflection high-energy electron diffraction, θ–2θ x-ray diffraction analysis, thermopower, and Hall measurements. Both the crystallinity and the transport ar…
The effect of localized holes on the long-range antiferromagnetic order in bilayer cuprates is studied, by applying the renormalization group to the appropriate non-linear sigma model. The theory accounts quantitatively for the magnetic phase diagram of Ca doepd YBa_2Cu_3O_6.
Bi2Sr2-xLaxCaCu2O8+d superconducting whiskers were successfully grown from Bi-rich meltscontaining various La contents. Effect of La-doping on the whisker growth, structure and superconductivity has been studied. It has been found that the whiskers can be grown only from La-doped melts, no whisker was obtained from th…
Oriented, single phase thin films of La1−xCaxMnO3 have been deposited onto (100)-oriented LaAlO3 (0.1<x<0.5) substrates using the pulsed laser deposition technique. While for some compositions, the physical properties (transport and magnetization) of the as-grown films are higher than the bulk values, fo…
Superconductivity in thin films and powders, and in single crystals of Pr-123 has been found by Blackstead et al. and Zou et al., respectively. Nevertheless, up to now it has never been reported in sintered-policrystalline samples. We have prepared high-quality samples of this material by following a sol-gel method. W…
Omega-Methacryloyloxyalkyl phosphorylcholine (MAPC) polymer, which has various methylene chain lengths between the phosphorylcholine group and the backbone, was synthesized with attention to formation of the biomembrane. The effect of water-soluble poly(MAPC) on the function and activation of blood cells was evaluated…
The adhesion of marrow stromal osteoblasts and the adsorption of fetal bovine serum (FBS) proteins to end-capped poly(D,L-lactic acid) 50:50 (PLA50) of molecular weight 17,000 (PLA5017), non-end-capped PLA50 of molecular weight 11,000 (PLA5011h), and a diblock copolymer made of poly(ethylene glycol)-monomethyl ether o…
Crosslinking of dermal sheep collagen (DSC) was accomplished using 1, 4-butanediol diglycidyl ether (BDDGE). At pH values > 8.0, epoxide groups of BDDGE will react with amine groups of collagen. The effects of BDDGE concentration, pH, time, and temperature were studied. Utilization of a 4-wt % BDDGE instead of 1-wt %…
The attachment of human umbilical vein endothelial cells (HUVECs) on substrates that had been covalently grafted with the cell adhesion peptides Arg-Gly-Asp (RGD) was investigated. This approach was used to provide substrates that are adhesive to cells even in the absence of serum proteins and to cells that have had n…
Silk fibroin membranes recently have been suggested as matrices for biomedical applications, such as guided tissue regeneration and burn wound dressings. The aim of this study was to evaluate the inflammatory potential of fibroin films and to compare the fibroin films with two model materials with completely different…
Changes to the surface plasmon resonance band of stable nanoscopic gold particle films were monitored with a UV−vis spectrometer as the films come in contact with a host analyte of varying concentrations. The gold particle films were prepared via a sputtering and annealing method and were secured in a flow cell with e…
We present a light-harvesting strategy that utilizes organic donor molecules to achieve sensitized metal-to-ligand charge transfer (MLCT) based emission. In this scheme, coumarin dye molecules are covalently linked to the periphery of diimine ligands in Ru(II) inorganic complexes that display MLCT excited states. Our…
Nanosized titanium(IV) oxide in the anatase form was synthesized by hydrolysis of titanium(IV) alkoxide in toluene with water that was dissolved from the gas phase at high temperatures (150−300 °C). With elevation of the reaction temperature and an increase of the reaction time, the crystallite size of the anatase was…
A portable acoustic emission monitoring system has been developed and used to test both laboratory samples and practical equipment. A fibre optic cable provides electrical isolation and protection for the operator and the monitor. This has been tested on high voltage equipment up to 400 kV. In laboratory samples it ha…
Strictly alternating copolyimides containing aliphatic spiro units were prepared via diimide (with five-membered rings)−dianhydrides (with six-membered rings) derived from 2,8-dioxaspiro[4.5]decane-1,3,7,9-tetrone (TCDA) and diamines. The polymerization was conducted by the conventional two-step procedure using the di…
Micelles with unprecedented flowerlike arrangements of the poly(ferrocene) cores (shown in the TEM image) are among the supramolecular architectures generated in the self-assembly of a novel organometallic triblock copolymer from silicon-bridged [1]ferrocenophane monomers and [Me(2)SiO](3) in hexane, a solvent selecti…
A series of new anionic, cationic, and betainic methine dyes (an example is illustrated here) have been synthesized from methyl- or methylene-substituted 2,2-difluoro-1,3,2-dioxaborines and reactive formyl derivatives. These dyes have intense long-wavelength absorptions in the red or near-infrared region.
Dendrimeric polyphenylselenides are prepared in high yield using propyloxy spacers to connect the phenyseleno groups to the dendrimeric core. The selenides catalyze the oxidation of bromide with hydrogen peroxide to give positive bromine species that can be captured by cyclohexene in two-phase systems. The increase in…
Auf geordnete Weise auf Graphit adsorbieren und mit molekularer Auflösung abbilden ließen sich erstmals supramolekulare Systeme aus gitterartigen Metallkoordinationsverbindungen. Dabei zeigte sich, daß – in Abhängigkeit von den jeweiligen Liganden – die Metallgitter parallel oder senkrecht zum Substrat angeordnet sind…
Supramolecular arrays in which a free-base (or zinc) porphyrin is connected by axial coordination of its meso-pyridyl groups to one or more ruthenium porphyrin units have been studied by steady-state and time-resolved techniques. Besides their attractive structures—“open-box” or “flying saucer”—these arrays exhibit in…