Materials Literature
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Abstract Monodisperse polyacrolien (PA) microspheres were obtained by a single step process via two mechanisms: (a) aqueous polymerization of acrolein under alkaline conditions and (b) aqueous radical polymerization of acrolein by irradiation with a cobalt source. The diameter of the former microspheres can be varied…
Temperatures of the nematic → isotropic (TNI) and smectic-A → nematic (TSN) transitions in p-quaterphenyl, p-quinquephenyl and p-sexiphenyl have been determined from differential scanning calorimetry measurements carried out on the pure compounds and their binary mixtures. Both transitions are located below the meltin…
Three anhydrous forms (forms I, II, and III), dihydrate (form IV) and monoacetonate (form V) of carbamazepine were prepared and characterized by elemental analysis, infrared spectrum, X-ray powder diffraction, differential scanning calorimetry (DSC), and differential thermal analysis (DTA). The phase transition of the…
The character and occurrence of mist, hackle, and crack-branching features on ceramic fractures are reviewed and possible mechanisms for causing these features are discussed. Besides glass and polycrystalline fractures, substantial attention is paid to fractures of ceramic crystals, for which new data are presented an…
Low-density structures such as colloidal aggregates become increasingly easy to deform mechanically as their size increases. We use recently-proposed scaling properties of such aggregates to investigate the effects of thermal fluctuations and of gravitational forces on such structures. For typical colloidal aggregates…
The conducting organic salt N-methylphenazinium tetracyanoquinodimethanide can be used as an electrode for the oxidation of NADH at a sufficiently rapid rate to be a good detector in an enzyme coupled sensor.
Recently, the transform method for calculating Raman excitation profiles (REP’s) from the absorption spectrum has been extended to include both the Condon and non-Condon sources of scattering. In the present work, this theory is applied to REP’s in the Soret region of ferrocytochrome-c, where data are presented for tw…
The self-trapping of exciton in the CDW phase of one-dimensional many-electron system with short-ranged electron-phonon(e-p) and electron-electron(e-e) interactions is studied by a variational method for exciton and in the adiabatic limit for phonons, so as to clarify its lattice relaxation after the light excitation.…
The present paper states very briefly the main steps leading to the technique of scanning electron microscopy (SEM) of vascular corrosion casts. From the terms presently used (injection method, microcorrosion cast, injection replica, vascular corrosion cast, vascular cast) the use of "vascular corrosion cast" for lymp…
The anchoring strength coefficient B is measured as a function of temperature using a Freedericksz technique in a very thin (l < 2.5 μm) surfactant-treated cell of methoxybenzylidene butylaniline (MBBA). In the nematic phase this parameter varies from approximately 0.065 to 0.013 erg/cm2 for TNI - 20 °C < T < TNI. The…
The elastic energy expression of de Gennes for the non-chiral and chiral smectic-C phases is reformulated, and it is shown that the maximum size of a uniformly oriented sample is limited, not only by the chiral helix but also by a spontaneous bend of the smectic layers. A description of the flexoelectric effects is gi…
We present experimental and theoretical studies of the structures and transitions of the molecular orientation field of a smectic C* liquid crystal in the surface-stabilized geometry. The experimental results show that structures having from two to six stable orientation configurations are possible. The optical proper…
Papers were presented at the following sessions: Leaching Mechanisms; Materials Performance in Repositing Environments; Spent Fuel Studies; Geochemical Interactions; Natural Analogues; Radiation Effects; Research at the US Department of Energy Materials Characterization Center; Processing Technology; Materials Science…
A negative apparent adsorption onto activated charcoal has been observed for methyl alcohol, ethyl alcohol, n-propyl alcohol, n-heptane, methylcyclopentane and methylcyclohexane under pressures of 0.1–196.2 MPa and at temperatures of 298.2–348.2 K. The adsorption isotherm exhibits a straight line with a negative slope…
Abstract The dielectric properties, DC electrical conductivity, and I ‐ V characteristics of thin films of polyelectrolyte complexes formed by glycol chitosan (GlChi) with mucopolysaccharides chondroitin sulfate A (CSA), chondroitin sulfate C (CSC), and hyaluronic acid (HA) have been studied at different temperatures.…
A comparative study of the oxidation behavior of Zircaloy-4 versus austenitic stainless steel No. 1.4970 was performed in high-temperature steam. Nuclear reactor-type tube sections of both materials were exposed on both sides to superheated steam at temperatures ranging from 600 to 1300°C for up to 6 h. The specimens…
Seeds from three sympatric populations of Calotropis procera (Ait.) R. Br., identified on the basis of variation in coronal structure, were kept separately for germination under different environmental conditions. The general trend of percentage germination in laboratory conditions for the population was A-type > B-ty…
A phenomenological model has been developed for predicting iodine-induced stress-corrosion crack (SCC) initiation and growth in Zircaloy cladding. This model is capable of predicting various observed behaviors related to SCC. A recently developed submodel for predicting the effect of texture on SCC has been incorporat…
Least-squares analytical techniques are used to examine additivity relationships for combinedion thermodynamic data to effect appropriation into single-ion components for alkali-metal halide salts by employing Fajans' competition principle. Absolute free energies, enthalpies and entropies of hydration are derived lead…
Fatigue strength and fatigue crack growth rates in nickel-aluminum bronze alloys were measured in air and 3.0 % sodium chloride solution under a free corrosion potential. The effect of a corrosion inhibiting heat treatment (6 h at 700°C followed by air cooling) on fatigue strength and fatigue crack propagation rates i…