Materials Literature
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Despite the presence and abundance of archaea in low-temperature environments, little information is available regarding their physiological and biochemical properties. In order to investigate the adaptation of archaeal proteins to low temperatures, we purified and characterized the elongation factor 2 (EF-2) protein…
Using scaling theory, we investigate the equilibrium behavior of a melt of functionalized chains, nonfunctionalized polymers, and two infinite, planar surfaces, which model clay sheets. The functionalized chains contain two end groups (one at each chain end) that are highly attracted to the surfaces. We calculate the…
The π-orbital electronic structure of polyhex carbon tori constructed from bent individual single-wall nanotubes is investigated within the tight-binding approach. Analytical solutions for tori from nanotubes of arbitrary radius, length, chirality, and twisting angle are derived using simple geometrical and band-struc…
The dissociation behavior of dilute, immiscible Cu-alloy thin films is found to fall into three broad categories that correlate most closely with the form of the Cu-rich end of the binary alloy phase diagrams. Available thermodynamic and tracer diffusion data shed further light on alloy behavior. Eight alloying elemen…
Larry R. DaltonUniversity of WashingtonDepartment of ChemistrySeattle, Washington 98195-1700andUniversity of Southern CaliforniaLoker Hydrocarbon Research InstituteLos Angeles, California 90089-1661E-mail: dalton@chem.washington.eduE-mail: ldalton@methyl.usc.eduAbstract. Translation of the large molecular hyperpolariz…
The frequency dependent hyperpolarizability of typical donor–acceptor organic nonlinear optical molecules is commonly represented by a nonresonant two-level model, first presented by Oudar and Chemla. We discuss how this model can be extended into the resonant regime, including cases where the molecular transition is…
A simple density functional approach is used to calculate the surface tension and density profiles of the interface between demixed fluid phases for a model colloid-polymer mixture. Using an effective one-component Hamiltonian for the colloids, obtained by integrating out the degrees of freedom of the polymer, we find…
The lattice heating effect on the kinetics of attaining the steady state of hot carrier thermoelectric power in a p-n junction is theoretically studied. It is shown that lattice heating leads to an additional third stage in the process of attaining the steady state in thermal currents and the thermoelectric power of h…
A macroscopic theory for the dynamics of compressible nematic polymer-viscous fluid interfaces is developed from first principles. The theory is used to define and characterize the basic interfacial viscoelastic material properties of the ordered interfaces. The theory is based on a decomposition of the kinematic fiel…
Abstract This paper demonstrates that the carbon—silica dual phase fillers are comprised of aggregates containing both carbon and silica phases. The silica is shown to be finely distributed among the carbon phases within the aggregates and within the particles of the dual phase aggregates. Analysis of the silicon cont…
Abstract An experimental analysis of hysteresis loss, hysteresis loss ratio and input energy of natural rubber (NR) and styrene-butadiene rubber (SBR) vulcanizates having variations of loading of carbon black, precipitated silica and clay has been carried out under uniaxial, pure shear and constrained extension modes…
Abstract Alkoxysilanes can be grafted onto an ethylene homopolymer or copolymer to give a moisture crosslinkable polymer. Moisture crosslinking has many benefits over peroxide‐ or irradiation‐induced crosslinking. Simple, conventional equipment allows processing with lower capital investment and less manufacturing spa…
Abstract Phase transfer catalyst coatings have been developed that increase the stabilization effectiveness of acid absorbers such as hydrotalcite and Type A zeolite in combination with lead stabilizers, and also with organotin stabilizers having structures that previously did not provide synergistic effects with acid…
A theoretical model taking into account the photoisomerization influence on the nematic scalar order parameter is presented. An extension of the Maier-Saupe model is used to investigate the concentration dependence of the scalar order parameter. The evolution of the concentration of cis-trans isomers and of the scalar…
Eight types of low-activation concrete have been developed and some types of low-activation reinforcement have been selected. These materials have been irradiated by thermal neutron with some reference materials. The induced activities have been measured with a Ge detector and a liquid scintillation detector. Based on…
Abstract Solid state characterization of poly(L‐lysine)hydrobromide was obtained via differential scanning calorimetry, thermogravimetric analysis, optical microscopy and infrared spectroscopy. The glass transition temperature of poly(L‐lysine)hydrobromide is 178°C. This thermal transition has not been reported previo…
Our initial paper reported that the catalytic epoxidation of p-methoxystyrene by the Mn(TPP)Cl/LiOCl system in a biphasic medium CH 2 Cl 2 /H 2 18 O produced the expected epoxide with less than 5% of 18 O incorporation.More recently we described the partial incorporation of oxygen atom from labeled water within olefin…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTEffect of Polymer Adsorption on the Surface Tension and Flocculation of Colloidal Particles in Incompatible SolventsNily DanView Author Information Department of Chemical Engineering, Drexel University, Philadelphia, Pennsylvania 19104 Cite this: Langmuir 2000, 16, 8, 4045–4048…
Abstract The odd electron in the δRhRh* orbital of (3,1)-[Rh2(mhq)4py]+ (1+; Hmhq = 4-methyl-2-quinolinol) was estimated to be delocalized onto each π system of the four mhq bridges to the extent of ca. 9% based on its 1H NMR paramagnetic shifts. The experimental spin distribution in the mhq ligands is consistent with…
Abstract Polymer solidification under processing conditions is a complex phenomenon in which the kinetics of flow, high thermal gradients and high pressures determine the product morphology. The study of polymer structure formed under pressure has been mainly made using conventional techniques such as dilatometry and…