Materials Literature
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Reaction of [Cr V (N)(salen)]·CH 3 NO 2 and [Mn V (N)(salen)] in dimethylformamide or a methanol/water mixture with an aqueous solution of NaCN and CsCl or [N(CH 3 ) 4 ]Cl at elevated temperatures affords in good yields, respectively, yellow microcrystalline compounds of Cs 2 Na[Cr V (N)(CN) 5 ] ( 1 ); [N(CH 3 ) 4 ] 2…
We consider an emulsion whose droplets contain a trapped species (insoluble in the continuous phase) and study the emulsion's stability against coarsening via Lifshitz−Slyozov dynamics (Ostwald ripening). Extending an earlier treatment by Kabalnov et al. ( Colloids Surf., 1987, 24, 19−32), we derive a general conditio…
Magnetotransport properties of the Mn(IV)-rich perovskites Ca1-xLnxMnO3 and Ca1-xThxMnO3 (0 ≤ x ≤ 0.20) have been systematically investigated. Among the different factors governing their colossal magnetoresistance (CMR), we demonstrate that the electron concentration is the predominant one by comparing the effects of…
Mesoporous silicas with variable pore size and architecture were made by using aqueous solutions of block copolymers with one polyelectrolyte block as templates in a sol-gel process. Pore size and connectivity follow the structure of the block copolymer micelles or mesophases, i.e., the resulting silica gel network is…
We study two closely related, nonlinear models of a viscoplastic solid. These models capture essential features of plasticity over a wide range of strain rates and applied stresses. They exhibit inelastic strain relaxation and steady flow above a well defined yield stress. In this paper, we describe a first step in ex…
Small-angle X-ray scattering (SAXS), optical microscopy and differential scanning calorimetry were used to establish relationships between crystallization, microstructure, and equilibrium melting temperature ( T m 0 ) for random copolymers of poly( l -lactide- co - meso -lactide). T m 0 s derived using the Gibbs−Thoms…
A liquid drop on a tilted plate can remain at rest, provided that an hysteresis for the contact angle exists. We examine in this paper the case of small contact angle hysteresis, for which the drops are found to be nearly spherical caps, despite the slope. We derive in particular the condition (both in angle and hyste…
The shape evolution of small heated metal particles is dominated by surface diffusion. When two spheres touch, they will thus merge into one, as they continually decrease their surface area. Focusing on the asymptotic behavior when the radius $r$ of the neck joining the two spheres is still small, it is found that the…
A novel multi-scale seamless model of brittle-crack propagation is proposed and applied to the simulation of fracture growth in a two-dimensional Ag plate with macroscopic dimensions. The model represents the crack propagation at the macroscopic scale as the drift-diffusion motion of the crack tip alone. The diffusive…
We have investigated the possibility afforded by epitaxial ferroelectric oxide thin films to control and image locally the polarization field of ferroelectrics over large areas with submicron resolution, using the metallic tip of an atomic force microscope as a mobile top electrode and local probe of the ferroelectric…
A two-dimensional thermodynamic model was developed to account for the observed difficulty in the fabrication of epitaxial Pb(Zr,Ti)O3 (PZT) thin films in which tetragonal and rhombohedral phases coexist. The thermodynamic formalism based on the Landau–Devonshire’s phenomenological theory predicts the enhanced thermod…
Our extended electrical conductivity and viscosity measurements have revealed a general fractional power relation between them in pure and mixed ionic melts: $\ensuremath{\sigma}T\ensuremath{\propto}(T/\ensuremath{\eta}{)}^{m}$ ( $m\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.8\ifmmode\pm\else\textpm\fi{}0.1$…
Measurements of the temperature dependence of the thermoelectric power and the resistivity of ${}^{18}\mathrm{O}{/}^{16}\mathrm{O}$ isotope-exchanged $({\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Nd}}_{x}{)}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ samples have confirmed the existence of vibronic electronic states bel…
We report STM-induced desorption of H from $\mathrm{Si}\left(100\right)\ensuremath{-}\mathrm{H}\left(2\ifmmode\times\else\texttimes\fi{}1\right)$ at negative sample bias. The desorption rate exhibits a power-law dependence on current and a maximum desorption rate at $\ensuremath{-}7\mathrm{V}$. The desorption is expla…
The notion of magnetic symmetry is reexamined in light of the recent observation of long-range magnetic order in icosahedral quasicrystals [Charrier et al., Phys. Rev. Lett. 78, 4637 (1997)]. The relation between the symmetry of a magnetically ordered (periodic or quasiperiodic) crystal, given in terms of a ``spin spa…
Abstract Ceramic matrix composites are being developed to operate at elevated temperatures and in oxidizing environments. Considerable improvements are being made in the creep resistance of SiC fibers and hence in the high-temperature properties of SiC/SiC composites; however, more needs to be known about the stabilit…
Abstract The relationship between biomineralization and microbiologically influenced corrosion (MIC) is intuitive—microorganisms influence corrosion by both forming and dissolving minerals. Biomineralization that results in mineral deposition on a metal surface can shift the corrosion potential in either a positive or…
Abstract The effect of zinc addition to the primary water on Primary Water Stress Corrosion Cracking (PWSCC) susceptibility and crack growth rate of mill annealed alloy 600 (600MA), covered with oxide film which were formed beforehand in the simulated PWR primary chemistry for long time, were examined in the chemistry…
Abstract Effects of flow velocity on corrosion and galvanic corrosion behavior in wet CO2 environments were investigated using flow loop tester for materials and material combinations from carbon steels to corrosion resistant alloys (CRAs) more than 13%Cr stainless steels. The flow velocity dependence of corrosion rat…
Abstract The efficiency of an inhibitor was evaluated on precorroded samples at different temperatures, pH values and flow velocities. A procedure based on the use of electrochemical impedance spectroscopy (EIS) and rotating cylinder electrodes was implemented in order to study the effect of these variables. An experi…