Materials Literature
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An analytical treatment of quasi-equilibrium carrier transport in disordered materials at moderate electric fields is presented. The transport equation derived has the form of a conventional Fokker-Plank equation with drift, diffusion and field-assisted diffusion terms. General formulae are obtained for drift mobility…
Abstract The overall isothermal crystallization kinetics for nucleated and non‐nucleated isotactic polypropylene (iPP)‐dotriacontane systems was investigated. Adipic acid was used as the nucleating agent. Half‐time was determined via differential scanning calorimetry as a function of the experimentally controlled vari…
Abstract Methyl‐3,3,3‐trifluoropropylsiloxane (F)‐dimethylsiloxane (D) random and block copolymers were prepared. The random copolymers were prepared by equilibrium copolymerization starting from a mixture of cyclic F and D siloxanes with potassium silanolate as the catalyst. The F‐D block copolymer was prepared by se…
Abstract Non‐isothermal crystallization growth rates of nucleated and non‐nucleated isotactic polypropylene (iPP) in dotriacontane were determined experimentally by thermal optical microscopy. Adipic acid was used as the nucleating agent. The non‐isothermal growth rates of the nucleated and non‐nucleated systems were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSolid-state cathode materials for lithium batteries: effect of synthesis temperature on the physical and electrochemical properties of silver vanadium oxideRandolph A. Leising and Esther Sans TakeuchiCite this: Chem. Mater. 1993, 5, 5, 738–742Publication Date (Print):May 1, 1993…
Charge substitutions generated by site-directed mutagenesis at the termini of adjacent anti-parallel alpha-helices in a four-helix bundle protein were used to determine a precise value for the contribution of indirect charge-charge interactions to overall protein stability, and to simulate the electrostatic effects of…
We have measured the inelastic electron scattering spectra of a variety of Si and SiO2 thin films from the fundamental absorption threshold to well above the L-shell thresholds. We have used Kramers–Kronig analyses and sum rules to obtain the dielectric and optical response functions. We compare the optical properties…
We study a system of hard spherocylinders in contact with a hard wall, assuming that the length-to-width ratio of the spherocylinder tends to infinity. The Onsager approximation is applied to calculate the free energy of the system. The integral equation for the one-particle distribution function is solved in the unia…
Recent research into using offline and online diagnostics to study ageing of generator insulation is discussed. Preventive maintenance based on offline diagnostic methods and adequate updating of windings are reviewed. A few examples of online partial discharge measurements and sensor designs of and concepts under dev…
An improved algorithm is described for automated structure-factor refinement using convergent-beam electron diffraction patterns. In addition to refinement of structure factors, absorption coefficients and sample thickness, the new algorithm includes beam-direction refinement, the inclusion of weak-beam effects using…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of electronically excited copper(II)-porphyrin with oligo- and polynucleotides: exciplex building process by photoinitiated axial ligation of porphyrin to thymine and uracil residuesPeter Mojzes, Laurent Chinsky, and Pierre Yves TurpinCite this: J. Phys. Chem. 19…
A Herzberg–Teller expansion for π electrons in the ground state of conjugated polymers identifies quadratic electron–phonon (e–ph) contributions and suggests a σ+π reference force field F0 based on butadiene. Linear response theory then fixes linear e–ph coupling constants for the Raman shifts in polyacetylene (PA) du…
Using an iterative method modernized with the adaptive subadjustment, we calculated phase functions of the focusators into a longitudinal axial line-segment, which is characterized by the constant light intensity along the line. Numerical studies were performed of a focal area: a character of variations of both the tr…
Abstract In situ surface enhanced Raman spectra (SERS) of adsorbed oxygen were obtained during oxygen adsorption and ethylene epoxidation on Ag catalyst surfaces at temperatures between 25 and 400 °C and atmospheric total pressure. Three types of Ag catalysts were investigated: (I) Ag supported on a ‐Al 2 O 3 , (II) A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of halogens with laser-ablated boron: infrared spectra of BXn (X = F, Cl, Br, I; n = 1, 2, 3) in solid argonParviz Hassanzadeh and Lester AndrewsCite this: J. Phys. Chem. 1993, 97, 19, 4910–4915Publication Date (Print):May 1, 1993Publication History Published online…
The stratification dynamics of thin circular horizontal soap films was studied experimentally. A series of metastable circular stratification domains with different thicknesses were observed. Bubble-form instabilities of Rayleigh's type always appear at the borders of the thinnest domains. It has been found that the d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and stability of poly(3,4-dibutoxythiophenevinylene) copolymersMargaret L. Blohm, James E. Pickett, and Paul C. Van DortCite this: Macromolecules 1993, 26, 11, 2704–2710Publication Date (Print):May 1, 1993Publication History Published online1 May…
Photoinduced and thermally induced bleachings of as-deposited GexS100−x and (Ge0.3S0.7)100−yAgy films were systematically studied in the ranges of 21≤x≤42 and 0≤y≤67 using optical transmission measurement. The bleachings for the Ge-S system show a maximum at around the stoichiometric composition GeS2, whereas that for…
The thermodynamic constraint relating the standard free energy of formation of an oxide (MO c ) to its oxygen potentials by Δ G f 0 (MO c ) =½ƒ o c Δ Ḡ (O 2 ) d C ′ has been used to develop the full spectrum of oxygen potentials of the U─O and Zr─O systems at high temperatures. Henry's law is applied to the metal regi…
A systematic study of cobalt site preferences has been carried out in a number of rare-earth iron compounds. The M\"ossbauer source technique employed in this work offers a direct and unambiguous way to determine quantitatively cobalt site preferences in these compounds at extremely low cobalt contents. Data quality a…