Materials Literature
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A hydrophobic, CF3-functionalized silica aerogel has been applied to water-oil mixtures to determine oil absorbing capacity of the solid aerogel. Preliminary tests on Prudhoe Bay crude oil mixed with salt water, using the aerogel in powder form, show three regimes for absorbing based on oil to aerogel wt ratios (O/A):…
This paper demonstrates the viability of in-situ transmission electron microscopy for studying the deformation mechanisms of polymer nano-composites. In-situ straining studies are performed on carbon multiwalled nanotube (MWNT)-polystyrene composite films. The experiments show that load transfer across the nanotube-po…
The crystallographic and group theoretical analysis of the structural phase transitions in perovskite and perovskite-like crystals is reviewed. We include ABX3 perovskites and their relative crystals of ReO3 type (G0 = O1 h), elpasolites, cryolites and their relatives (G0 = O5 h), layered crystals of T1AlF4 series (G0…
The lattice thermal conductivity of a thermoelectric material can be significantly reduced at ordinary temperatures by boundary scattering but the beneficial effect on the figure of merit can sometimes be more than offset by boundary scattering of the charge carriers. Here we extend the previous theory to include both…
The oxidation behavior of three precursor‐derived ceramics—Si 4.46 BC 7.32 N 4.40 (AMF2p), Si 2.72 BC 4.51 N 2.69 (AMF3p), and Si 3.08 BC 4.39 N 2.28 (T2/1p)—was investigated at 1300° and 1500°C. Scale growth at 1500°C in air can be approximated by a parabolic rate law with rate constants of 0.0599 and 0.0593 μm 2 /h…
The Nd–Nd and Nd–Yb energy transfer processes are studied in lead fluoroindogallate glasses with the following molar composition: 30PbF2–20GaF3–15InF3–15ZnF2–(20–X)CaF2–XNdF3 (with X=0.1, 0.5, 1, 2, 4, and 5), 30PbF2–20GaF3–15InF3–15ZnF2–(20–X)CaF2–XYbF3 (with X=0.1, 0.5, 1, 2, 3, and 5), and 30PbF2–20GaF3–15InF3–15Zn…
Magnetoliposomes (MLs) conjugated with an antibody fragment to give specificity to a tumor were applied to hyperthermia for cancer. The Fab' fragment of the G250 antibody, which binds to MN antigen on many types of human renal cell carcinoma, was cross-linked to N-(6-maleimidocaproyloxy)-dipalmitoyl phosphatidylethano…
Macromolecules conjugated with polyethylene glycol (PEG) acquire more hydrophilicity, resulting in a longer half-life in circulation and lower immunogenicity. Two novel conjugates for MRI contrast agents were synthesized from a generation-4 polyamidoamine dendrimer (G4D), 2-(p-isothiocyanatobenzyl)-6-methyl-diethylene…
The luminescence of nanocrystalline cubic yttria has been measured for 300 and 80 K. A blueshift and a broadening of the absorption edge, both depending on the particle size were found. The energy of the radiation emitted due to the recombination of a bound exciton does not depend on particle size. The observations ar…
The lithium tetraborate (Li 2 B 4 O 7 ; LBO) crystals were successfully grown by Czochralski technique. The frequency and temperature dependences of dielectric constant and a c conductivity were investigated in the frequency from 100 Hz to 10 MHz along c -axis. The dielectric anomaly with broad peak about 300°C was ob…
A detailed study of the excited state energy migration dynamics that take place within an assembly of Ru(II) and Os(II) polypyridyl complexes linked together through a polymer backbone is presented. The energy migration process is initiated by the photoexcitation of the metal-to-ligand charge transfer (MLCT) transitio…
A simple methodfor the fabrication of anodic aluminum oxide films (AOFs) with perfectly ordered structures (see Figure) is presented by these authors. A common optical grating is used to prepattern the aluminum substrate, which is subsequently anodized under mild conditions to yield an AOF with a photonic bandgap in t…
Polymer-directed enzyme prodrug therapy (PDEPT) is a novel two-step antitumour approach using a combination of a polymeric prodrug and polymer-enzyme conjugate to generate cytotoxic drug selectively at the tumour site. In this study the polymeric prodrug N-(2-hydroxypropyl) methacrylamide (HPMA) copolymer-Gly-Phe-Leu-…
We present 17 O MAS NMR data for crystalline calcium dialuminate (grossite), CaAl 2 O 4 and monoaluminate, CaAl 4 O 7 . The first of these contains an oxygen tricluster site and serves as a model compound for sites of this type in aluminosilicate glasses. Tricluster site NMR parameters are distinct from those of bridg…
The (triphenylphosphine)cobalt(III) complex (2) of 5,10,15-tris(pentafluorophenyl)corrole (1) is shown to be an valuable precursor to complexes that have not been fully characterized previously. In contrast to other cobalt corroles, aromatic amines can be substituted for the triphenylphosphine in 2 to form six-coordin…
Complex impedance spectroscopic data were acquired on single crystals of the morphotropic phase boundary composition of 0.68Pb(Mg1/3Nb2/3)O3-0.32PbTiO3 over a wide range of temperatures (25–525 °C) and frequencies 1 kHz–1 MHz. This study takes advantage of plotting ac data simultaneously in the form of impedance and m…
The diiron-substituted silicotungstate γ-SiW10{Fe3+(OH2)}2O386− (schematically shown) is an effective catalyst for the oxygenation of alkenes in homogeneous reaction media with 1 atm of molecular oxygen. For example, a selectivity for cyclooctene oxide of 98 % and a turnover number of 10 000 were achieved in the epoxi…
A method for microspectroscopy and energy-selective imaging using a special photoemission electron microscope (PEEM) is presented. A modified commercial PEEM was combined with a delay line device as x, y, t detector serving as the basic arrangement for spectromicroscopy. One can measure the time of flight of the elect…
The effects of ultrasound on the adsorption and desorption of phenol using activated carbon and polymeric resin was investigated. For adsorption in a batch adsorber, ultrasound was found to act like a mixer, improving the mass-transfer coefficient through cavitation and acoustic streaming. The mass-transfer coefficien…
The structure of beta-ketoacyl-[acyl carrier protein] reductase (FabG) from Escherichia coli was determined via the multiwavelength anomalous diffraction technique using a selenomethionine-labeled crystal containing 88 selenium sites in the asymmetric unit. The comparison of the E. coli FabG structure with the homolog…