Materials Literature
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The (1- x )LaAlO 3 – x SrTiO 3 solid solution system with the perovskite structure was synthesized and its dielectric behavior was investigated. The lattice parameter of (1- x )LaAlO 3 – x SrTiO 3 increases with increasing the fraction of SrTiO 3 in the system. 0.45LaAlO 3 –0.55SrTiO 3 shows a dielectric constant ε of…
Molecular polarizabilities and hyperpolarizabilities of a series of octupolar molecules that are donor-substituted triphenylmethane dyes are calculated. The four-state model of an octupolar molecule is used to describe the nonlinear optical properties of this type of molecules. As the charge-transfer character of the…
Members of a panel of stress-responsive biosensors have been used to study the effect of megahertz frequency ultrasound on Escherichia coli. Insonification causes acoustic cavitation, the collapse of oscillating microbubbles in solution, which can damage bacterial cells. A focused 1-MHz ultrasound transducer, capable…
The electrochemical properties of several substituted terheterocycles thiophene−pyrrole−thiophene oligomers have been studied by cyclic voltammetry and double-potential-step chronoamperometry and then compared with the behavior of the corresponding pure terthiophenes. E ° and lifetimes of the cation radicals have been…
Zinc sulfide (ZnS) powders have been obtained by precipitation from homogeneous solutions of various zinc salt compounds, with S 2‐ as precipitating anion, formed by decomposition of thioacetamide. Spherical particles with a very narrow size distribution can be obtained by controlling the synthesis parameters. The par…
We have investigated the thermal and optical stabilities of the photoalignment layers for nematic liquid crystals (LCs). For the photoalignment layers, three kinds of photoisomerizable polymer systems were studied; a polyamic acid doped with azobenzene molecules, a side-chain-substituted polyamic acid with azobenzene…
A molecular dynamics simulation has been performed for a short chain-molecule system to study structure formation during the crystallization induction period. A model simulating n-alkane having 20 methylene units was used for the short-chain molecule. A model system containing either 250 or 2000 chains was quenched fr…
Base‐catalyzed hydrolysis and condensation of zinc acetate dihydrate in alcoholic environments yields highly concentrated ZnO colloids with molarities near 3 M (50–70 wt % solid content) and particle sizes between 3 and 6 nm. These solutions were optimized to be stable against coagulation for several months and to yie…
ABSTRACT This study was performed to describe an application of the vane method for the rapid, quantitative measurement of spreadability, a subjective, textural property. Yield points of thirteen commercial food items were determined and related to spreadability using models HBTDV‐I and 5X HBTDV‐I Brookfield viscomete…
Bone morphogenetic proteins (BMPs) were originally identified by their ability to induce ectopic bone formation and have been shown to promote both chondrogenesis and chondrocyte hypertrophy. BMPs have recently been found to activate a membrane serine/threonine kinase signaling mechanism in a variety of cell types, bu…
We have investigated fast relaxational processes and the much debated boson peak in the strong glass former, ${\mathrm{B}}_{2}{\mathrm{O}}_{3},$ from 60 to 1300 K (glass transition temperature 523 K) using coherent inelastic neutron scattering. The wave-vector dependence of the dynamic structure factor is different fo…
The room-temperature photoluminescence (PL) of Tb3+ ions has been studied. The Tb ions were implanted into 200 nm thick SiO2 on Si wafers. To achieve a uniform Tb distribution, the implantations were performed at 50, 100, and 190 keV to a total dose of 8.8×1014–1.3×1016 ions/cm2, resulting in Tb concentrations of 0.18…
Erbium environments in several multicomponent glasses are investigated using X-ray absorption fine structure spectroscopy on the Er LIII-edge. Glass hosts studied include aluminosilicate, fluorosilicate, phosphosilicate, alkali phosphate, fluoride, and another multicomponent silicate glass. The Er–O separation is foun…
Milled B-doped mesophase pitch-based carbon fibers (mMPCF's) prepared from a melt-blown petroleum mesophase pitch precursor material have been developed for enhanced Li uptake capacity in Li ion batteries. Raman spectroscopy has been used to investigate the structure of graphitized and B-doped mMPCF's using 632.8-nm H…
A variety of 18-membered cyclodepsipeptides with alternating repeats of aromatic (phenyl or pyridyl) and Ser units in the ring have been synthesized and studied by X-ray crystallography for self-assembly patterns. Single-crystal structures of the macrocycles showed similar, relatively flat-ring structures. Those molec…
A homogeneous and stable amorphous‐type cordierite (2MgO2Al 2 O 3 5SiO 2 ) powder was prepared by a solution‐polymerization route employing a Pechini resin or a poly(vinyl alcohol) (PVA) solution as the polymeric carrier. After calcination at 800°C for 1 h under atmospheric conditions, the bulky precursor changed into…
EXAFS spectra of distorted and disordered small MoS 2 particles were simulated by means of the FEFF7 program. The simulated EXAFS spectra of several models were compared with observed EXAFS spectra of small MoS 2 particles which had been characterized by TEM (Calais et al. J. Catal . 1998, 174, 130). The EXAFS spectra…
Heterologous expression of the phaC1 gene from Pseudomonas aeruginosa, which encodes one of the polyhydroxyalkanoic acid synthases, in Escherichia coli impaired in fatty acid beta-oxidation results in polyhydroxyalkanoic acid accumulation when cells were cultivated on fatty acids. We evaluated the application of the f…
Excitation of a triad artificial photosynthetic reaction center consisting of a porphyrin (P) covalently linked to a fullerene electron acceptor (C 60 ) and a carotenoid secondary donor (C) leads to the formation of a long-lived C • + −P−C 60 • - charge-separated state via photoinduced electron transfer. This reaction…
A scheme for generating complex, spatially separated patterns of multiple types of semiconducting and/or metallic nanocrystals is presented. The process is based on lithographic patterning of organic monolayers that contain a photolabile protection group and are covalently bound to SiO2 surfaces. The process results i…