Materials Literature
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We have investigated systematically the effects of various gas adsorbates (H2, N2, O2, and H2O) on the electronic structures and the field emission properties of open edges of single-walled carbon nanotubes by density functional calculations. All of the molecules, except N2, dissociate and chemisorb on open nanotube e…
We report here, for the first time, synthesis of anchored Pd complexes in mesoporous supports such as MCM-41 and MCM-48 as true heterogeneous catalysts for hydrocarboxylation of aryl olefins and alcohols to give excellent conversion ( approximately 100%) and regioselectivity ( approximately 99%) for 2-arylpropionic ac…
Modification induced by 110 MeV Ni ion irradiated thin film samples of C60 on Si and quartz substrates were studied at various fluences. The pristine and irradiated samples were investigated using Raman spectroscopy, electrical conductivity and optical absorption spectroscopy. The Raman data and band gap measurements…
Using an atom-vacancy exchange algorithm, we investigate the kinetics of the order-disorder transition in an fcc A_3B binary alloy model following a temperature quench from the disordered phase. We observe two clearly distinct ordering scenarios depending on whether the final temperature T_f falls above or below the o…
Codeposition of impurities during the growth of a vicinal surface leads to an impurity concentration gradient on the terraces, which induces corresponding gradients in the mobility and the chemical potential of the adatoms. Here it is shown that the two types of gradients have opposing effects on the stability of the…
Motivated by recent experiments we have carried out an Event Driven computer simulation of a diluted binary mixture of granular particles vertically vibrated in the presence of gravity. The simulations not only confirm that the kinetic energies of the two species are not equally distributed, as predicted by various th…
We present characterization data for linear poly(isoprene- b -styrene- b -ethylene oxide) (PI−PS−PEO) triblock copolymers containing equal volume fractions of PI and PS ( f PI = f PS ) and varying amounts of PEO, 0 ≤ f PEO ≤ 1 / 3 . Detailed characterization by TEM, SAXS, dynamic mechanical spectroscopy, static birefr…
Monte Carlo (MC) simulations of lattice models are a widely used way to compute thermodynamic properties of substitutional alloys. A limitation to their more widespread use is the difficulty of driving a MC simulation in order to obtain the desired quantities. To address this problem, we have devised a variety of high…
The effect of chitosan with different molecular weights as coatings for shelf-life extension of fresh fillets of Atlantic cod (Gadus morhua) and herring (Clupea harengus) was evaluated over a 12-day storage at refrigerated temperature (4 +/- 1 degrees C). Three chitosan preparations from snow crab (Chinoecetes opilio)…
We have fabricated high performance field-effect transistors made from semiconducting single-walled carbon nanotubes (SWNTs). Using chemical vapor deposition to grow the tubes, annealing to improve the contacts, and an electrolyte as a gate, we obtain very high device mobilities and transconductances. These measuremen…
Traditionally, corrosion protection of many reactive materials is associated with organic coatings, which are applied as thick multilayer films with thicknesses ranging from some 10 μm to some 100 μm. However, increasing interest exists in thin and ultrathin corrosion protecting films. This is particular true for mode…
Abstract The aluminium–magnesium alloy EN‐AW 5754 is studied with SEM, energy‐dispersive x‐ray imaging (EDX), AES and XPS after treatment by chemical etching and blasting with glass beads or alumina grit. Blasting proves to change more than the surface profile. The freshly treated surfaces are fully covered with a car…
Abstract Structure development during drawing was studied for three sets of polyamide‐66 (PA66) fibers with density, optical microscopy, wide‐angle X‐ray diffraction, and Fourier transform infrared spectroscopy. The crystallinity, estimated by density measurements, remained virtually constant with increasing draw rati…
The effects on void nucleation of fluctuations respectively due to the randomness of point-defect migratory jumps, the random generation of free point defects in discrete packages, and the fluctuating rate of vacancy emission from voids are considered. It was found that effects of the cascade-induced fluctuations are…
Abstract The XPS images of copper‐rich intermetallic particles in an aluminium alloy have been obtained after argon ion removal of the oxide at the surface of mechanically polished 2024T3 alloy. Comparison of the XPS analysis before and after etching indicates that the oxide does not include significant concentrations…
Langmuir−Blodgett (LB) films (nine double layers) of 2-[4-( N -dodecanoylamino)phenyl]-5-(4-nitrophenyl)-1,3,4-oxadiazole on gold were analyzed by means of infrared (IR) ellipsometry followed by theoretical interpretation of the measured spectra in a uniaxial anisotropic layer model. The same material in a KBr pellet…
The local spin method suggested previously for defining the spin state of an atom in a molecule is applied to model manganese complexes with three and four manganese centers. This method extracts from the wave function a spin for the manganese centers that has been compared to the one suggested by chemical intuition.…
Hydrogen/deuterium exchange rates in amide-functionalized monolayer protected gold clusters (MPCs) are controlled by the radial nature of the surface, with inhibition and catalysis observed at different chain lengths.
Sweating operations were explored for various crystalline layers obtained during layer-melt crystallizations. The crystalline layers used in sweating operations were crystallized at different cooling rates of 0.1, 1, and 5K/min, and different feed compositions of 80, 85, and 90 wt% caprolactam–cyclo hexanone mixtures.…
The Langmuir, Freundlich, and Temkin isotherms were fitted to copper (Cu) adsorption data of 20 highly calcareous soils of Fars Province, ranging widely in relevant physical and chemical characteristics. One-gram samples of each soil were equilibrated for 24 h with 30 mL of 0.01 M CaCl2 containing 50 to 500 mg Cu L−1.…