Materials Literature
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The effect of blend ratio and compatibilization on dynamic mechanical properties of PP/NBR blends was investigated at different temperatures. The storage modulus of the blend decreased with increase in rubber content and shows two Tg's indicating the incompatibility of the system. Various composite models have been us…
Anomalous effects associated with the electrochemical cycling of electrogenerated polypyrrole films after polarization at high cathodic potentials were simulated from a derivation of the electrochemically stimulated conformational relaxation model. The cathodic treatment promotes the compaction of the polymer by confo…
The mode assignments of the sixteen Raman bands observed for monoclinic zirconia (ZrO2) have been made by measuring the Raman spectra of the cationic- as well as the anionic-labelled compounds, that is, 91.22Zr(16O1—x18Ox)2 (x = 0.002 to 0.760) and 93.80Zr16O2. The four Raman bands at 334, 224, 192, and 180 cm—1 were…
We demonstrate the deposition of ZnS thin films with a thickness of 0.04 to m at temperatures ranging from 25 to C from chemical baths comprising zinc sulphate, triethanolamine and thioacetamide at pH of about 10. The as-deposited films do not show crystallinity, are very resistive (conductivity ) and possess no photo…
Luminescence properties are reported for the Eu 2+ -doped materials Ba 2 Mg(BO 3 ) 2, Ba 2 Ca(BO 3 ) 2, and Sr 2 Mg(BO 3 ) 2; they exhibit red, green, and yellow emission, respectively. Results from these materials have been coupled with those from another extensive series of Eu 2+ -doped borates to establish a correl…
Abstract The unsteady‐state kinetics of NH 3 adsorption–desorption and of selective catalytic reduction (SCR) of NO with NH 3 were studied over model V 2 O 5 /TiO 2 and V 2 O 5 –WO 3 /TiO 2 catalysts by transient response techniques. Over both catalysts the dynamic experiments could be successfully described by a kine…
The diesel particulate filter (DPF) technology with the use of fuel additives as regeneration aids is a promising technology for modern and future low-emissions diesel engines. The development of efficient and reliable DPF systems requires understanding of the regeneration process. Although the role of mathematical mo…
Macroscopically oriented silicate−surfactant liquid crystals are produced by slow cooling of lamellar and hexagonal mesophases through their isotropic−anisotropic phase transition in an 11.7 T magnetic field. Comparisons of in situ experimental and simulated 2 H NMR spectra quantify the degrees of orientational order…
Silver and mercury ions are reduced in a common solution by sodium borohydride in the presence of poly(ethyleneimine). Colloidal alloy particles are formed, whose plasmon absorption band is blue-shifted with increasing mercury-to-silver ratio. The reduction mechanism is rather complex: large mercury “drops” are first…
The state of the art in understanding of electromigration induced failure is outlined in the following review. An overview of the basic principles responsible for electromigration in conductors is followed by an explanation of what the consequences of electron flow directed mass transport are in circuit wiring with an…
The ability of clip shaped molecules based on the building block diphenylglycoluril to form complexes with dihydroxybenzene guest molecules has been studied in detail. The binding strength of these complexes can be varied over a wide range ( K a ≈ 0−10 5 M - 1 ), by applying small modifications in the host or the gues…
Other| October 01, 1997 Surface site-specific interactions of aspartate with calcite during dissolution; implications for biomineralization H. Henry Teng; H. Henry Teng Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Atlanta, GA, United States Search for other works by this author on: GSW Go…
The breaking thread and the sessile drop methods have been used to evaluate the interfacial tension between a polypropylene (PP) and a polyethylene-terephthalate (PET). An excellent correlation was found between the two. The breaking thread technique was then used to evaluate the interfacial tension of these blends at…
Simulations of translational motion on lattices with spatially heterogeneous dynamics have been performed. Translation occurs by nearest neighbor jumps on a three-dimensional simple cubic lattice. The overall lattice is subdivided into cubic blocks. The rate for jumps within a given block is controlled by the local re…
A new class of crown spirobenzopyrans were designed and synthesized. The crown spirobenzopyrans showed thermally irreversible photochromism only in the presence of alkali-metal cations accompanying cation-selective coloring efficiency. Thus, the new crown spirobenzopyrans could transmit information of two different si…
The characterization of the hepatobiliary contrast agent Gd-EOB-DTPA (gadolinium 3, 6, 9-triaza-3, 6, 9-tris(carboxymethyl)-4-(4-ethoxybenzyl)-undecandicarboxylic acid) in various media (water solution, protein containing solution, phosphorylated metabolites solution, and excised and perfused liver) was performed usin…
Abstract Packaging is important to preserve food quality. It is a barrier to water vapor, gas, aroma, and solute migration between the food and the environment. With the recent increase in ecological consciousness, research has turned toward finding biodegradable materials. The different kinds of biopackaging are disc…
Seven strains of filamentous fungi and one yeast were isolated from flax that was dew retted in the United States. These filamentous fungi were subcultured to purity and identified, and six appear not to have been reported earlier as isolates from dew-retted flax. Five of the purified U.S. strains, two fungi isolated…
2-O-(beta)-Mannosylglycerate, a solute that accumulates in some (hyper)thermophilic organisms, was purified from Pyrococcus furiosus cells, and its effect on enzyme stabilization in vitro was assessed. Enzymes from hyperthermophilic, thermophilic, and mesophilic sources were examined. The thermostabilities of alcohol…
Surface molecular motions of monodisperse polystyrene (PS) films, their binary and ternary blend films, and commercially available polydisperse PS films were investigated on the basis of scanning force microscopic (SFM) measurements at 293 K. The monodisperse PSs were synthesized by a living anionic polymerization. Th…