Materials Literature
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Conductive polymer composites showing large positive temperature coefficient (PTC) are made of semi-crystalline polymer as an insulator and a conducting filler, whose concentration is close to the critical volume fraction. In this study, the resistivity and PTC behavior of high density polyethylene (HDPE) filled with…
Laser-ablated copper atoms react with NO molecules in excess neon and argon during condensation to form the CuNO and Cu(NO) 2 complexes as major products and Cu(NO) 2 (NO)* as a minor product. In addition, the CuNO + cation and Cu(NO) 2 - anion are also formed. The product absorptions are identified from isotopic shif…
Lap shear and friction force measurements were carried out on a series of monodisperse polystyrene (PS) films below the corresponding glass-transition temperatures. It showed that adhesion between the PS/PS interface was possible at the temperature below the bulk Tg, and the lower the molecular weight of PS, the lower…
The binding of meso-tetrakis[4-(carboxymethyleneoxy)phenyl]porphyrin (T4CPP), meso-tetrakis[3-(carboxymethyleneoxy)phenyl]porphyrin (T3CPP) and meso-tetrakis[3,4-bis(carboxymethyl-eneoxy)phenyl]porphyrin (T3, 4BCPP) with bovine serum albumin (BSA) at pH 7.4 has been studied at 420 nm in detail. The results show hypoch…
Die Eigenschaften der Verbindungen [K-([2.2.2]-crypt)]3E9 mit isolierten Anionen E93– (E = Ge (1), Sn (2), Pb (3)) wurden EPR-spektroskopisch bei Raumtemperatur und 77 K, magnetochemisch im Bereich von 2 K bis 300 K und cyclovoltammetrisch in Lösung untersucht. Die EPR-Signale von Pulverproben und Einkristallen lassen…
The gene encoding dihydrofolate reductase, hdrA, from the extremely halophilic archaeon Haloferax volcanii was previously isolated from a spontaneous trimethoprim-resistant mutant in a DNA sequence that had undergone amplification. Here, we show that deletion of hdrA did not affect growth in minimal medium and that th…
Ordered titanium dioxide films with large and controllable microstructure have been prepared by a low temperature sputtering deposition method. The Figure displays the “parallel penniform” structure of the films, which have very large surface area and excellent contact to the underlying substrate, rendering them poten…
The diffusivities of C and O in calcite were determined in a pure CO 2 atmosphere at 100 MPa and temperatures ranging from 600 to 800 °C. The calcite crystals were preannealed and H 2 O was excluded from the system to determine the self-diffusion coefficients. The CO 2 consisted of 99% 13 C and 90% 18 O. After heating…
An NiO/yttria‐stabilized zirconia (YSZ) layer sintered at temperatures between 1100° and 1500°C onto dense YSZ electrolyte foils forms the precursor structure for a porous Ni/YSZ cermet anode for solid oxide fuel cells. Conflicting requirements for the electrochemical performance and mechanical strength of such cells…
In this study, extensive Monte Carlo simulation results are reported on the collective correlation factors (the correlated parts of the phenomenological coefficients) in the random binary alloy with the monovacancy mechanism operating at a very small vacancy concentration. It is found that results from the analytical…
Here, we show that an unfolded intermediate of canine milk lysozyme is extraordinarily stable compared with that of the other members of the lysozyme-alpha-lactalbumin superfamily, which has been studied previously. The stability of the intermediate of this protein was investigated using calorimetry, CD spectroscopy,…
We study the early stages of spinodal decomposition (SD) in polymer--liquid-crystal mixtures by solving linearized time-dependent Landau-Ginzburg equations for concentration (conserved order parameter) and orientation (nonconserved order parameter). The theory takes into account a cross term between concentration and…
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…