Materials Literature
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Classical dynamics simulations, coupled directly with semiempirical molecular orbital theory, reveal some of the important oxidation chemistry occurring in single wall carbon nanotubes. Two chemisorption reactions, 1,2 and 1,4-cycloaddition with 1O2, are observed from the simulations, the latter determined as the kine…
The relationship between the pressure, volume, and temperature (PVT) of poly(vinylidene fluoride) homopolymers (PVDF) and poly(vinylidene fluoride)–hexafluoropropylene (PVDF–HFP) copolymers was determined in the pressure range of 200–1200 bar and in the temperature range of 40°C–230°C. The specific volume was measured…
The McMurry coupling of tris(5-formyl-2-thienyl)methanes affords novel cage molecules which are bicapped with tris(2-thienyl)methanes and where all the sulfur atoms of thienyl groups direct inward.
The henequen fiber/poly(hydroxybutyrate-co-hydroxyvalerate) resin (PHBV) interfacial shear strength was characterized by single-fiber fragmentation (SFF) (also called the single-fiber composite test) and microbond techniques. The surface microstructure and tensile properties of henequen fibers were characterized using…
Seasonally irrigated flooding and fluctuation of groundwater level control the redoximorphic features, saturation, and reduction of rice‐growing Ultisols in different landscape positions of Taiwan. The objective of this study was to quantify soil hydromorphology of an Ultisol toposequence with different saturation and…
The potential application of ultrasonic attenuation spectroscopy to the in situ examination of solution phase crystallization processes is examined through studies carried out on two organic compounds: urea and (L)-glutamic acid. For this study a commercial ultrasonic spectrometer [Ultrasizer by Malvern Instruments Lt…
Bioresorbable films can serve simultaneously as anatomic support structures and as drug delivery platforms. In the present study, bioresorbable PLLA films containing dexamethasone were developed through solution processing. The effect of processing parameters on the film morphology and the resulting mechanical propert…
Highly efficient, segmented thermoelectric unicouple incorporating advanced thermoelectric materials with superior thermoelectric figures of merit are currently being developed at the Jet Propulsion Laboratory (JPL). These segmented unicouples incorporate a combination of state-of-the-art thermoelectric materials base…
Poly(2-methyl aniline) or poly(ortho-toluidine), as ring substituted derivative of aniline, has been synthesized electrochemically in various concentrations of H2SO4 and HCl, and then characterized by cyclic voltammetry, as well as by impedance and Raman spectroscopy. The cyclic voltammograms of poly(o-toluidine) and…
An experimental setup for in situ infrared reflection absorption spectroscopy (IRAS) studies of atmospheric corrosion of confined metal surfaces is described. Information about the drying process of confined metal surfaces and the chemical composition and growth rate of the corrosion products in the confinement was ob…
The melting phase diagram of the two-component system 2-methyl-2-chloro-propane ((CH3)3CCl) and carbon tetrachloride (CCl4) has been determined by combining X-ray powder diffraction and thermal analysis. The isomorphism relation between the orientationally disordered (OD) stable face-centered cubic (FCC) phase of (CH3…
The proposed two-step preparation route for rare earth polyborates, i.e. dehydration of boric acid in the presence of rare earth oxide at low temperature followed by careful annealing at 700 °C, led to, for the gadolinium case, a new gadolinium pentaborate (GdB5O9) that can not be prepared by conventional high-tempera…
Ambient oxidation of nanosized silicon nitride powder produced by the vapour phase reaction of silicon tetrachloride and ammonia has been studied in this work. Aliquots of the powder were stored in argon gas, in dry air and in air of 80% humidity, and changes in the bulk and surface properties were investigated agains…
Thermal and rheological properties of sodium dodecyl sulfate (SDS)-modified soy protein isolate (SPI) adhesives were studied using differential scanning calorimetry (DSC) and rheometry. The ordered structure of native SPI was denatured as SDS concentration increased, and thermal stability of native SPI decreased at hi…
Semiconductor detectors based on natural diamonds have been installed on the Large Helical Device (LHD) heliotron to measure the energy distribution of charge exchange fast neutral particles from different viewing angles. Advantages of a natural diamond detector (NDD) are (1) very compact size, (2) relatively easy han…
Cyclotetramerization of a mixture of 3,4-dicyano-1,2,5-thiadiazole or 3,4-dicyano-1,2,5-selenodiazole with 3,6-diamyloxyphthalodinitrile gives new unsymmetrical porphyrazines with annulated 1,2,5-thia(seleno)diazole and 3,6-diamyloxybenzene rings; the structures of the 1:3 products H2{XN2}{3,6-(OAm)2Bz}3Pz (X = S, Se)…
The solid state system Bi2O3:ZrO2 has been investigated up to 28 mol% ZrO2 using X-ray and neutron powder diffraction, ac impedance spectroscopy and differential thermal analysis. X-Ray powder diffraction has shown that a solid solution is formed with general composition Bi2 − xZrxO3 + x/2 (0.05 ≤ x ≤ 0.17) for sample…
The gold(I) precursor Au(O2CNEt2)(PPh3) has been successfully employed to graft isolated Au(PPh3) fragments on amorphous silica. Molecular models of the silica surface, i.e. Ph3SiOH, (c-C5H9)7Si7O12SiOH and (c-C5H9)7Si7O9(OH)3, have been found to react with Au(O2CNR2)(PPh3), R = Me, Et, yielding the corresponding sila…
The effects of chain cleavage and circular permutation on the structure, stability, and activity of dihydrofolate reductase (DHFR) from Escherichia coli were investigated by various spectroscopic and biochemical methods. Cleavage of the backbone after position 86 resulted in two fragments, (1--86) and (87--159) each o…
Results obtained for polyacrylonitrile microcellular foam thin films deposited on carbon fibers are presented. It appears that surface modifications by flow or water steam at high temperature lead to an increase of the film surface area as well as a proportional increase of capacitance. The films were characterized by…