Materials Literature
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The high‐temperature electrical properties (conductivity and thermopower) of the Co 0.4 Fe 2.6 O 4 ‐Mn 0.4 Fe 2.6 O 4 join were measured in order to determine the cation intersite distribution and establish the conduction mechanism. The cobalt and manganese site occupancies show a nearly linear composition dependence.…
Abstract X‐ray photoelectron spectroscopy was used to track chemical structure changes in conducting polypyrrole films which were electrochemically grown at various current densities. The film structures were correlated to changes in the film electrical conductivities. High resolution spectra of the C 1s, N 1s and O 1…
The theory of ultrasonic propagation in single-phase polycrystals presented in previous articles [J. Acoust. Soc. Am. 72, 1021–1031 (1982); 73, 1160–1163 (1983)] is generalized to calculate the scattering coefficients and phase and group velocities of plane compressional and shear waves in multiphase polycrystals. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTime-resolved SAXS on crystallization of a low-density polyethylene/high density polyethylene polymer blendH. H. Song, R. S. Stein, D. Q. Wu, M. Ree, J. C. Phillips, A. LeGrand, and B. ChuCite this: Macromolecules 1988, 21, 4, 1180–1182Publication Date (Print):April 1, 1988P…
The limits of families of stable solutions for the equation ε^2 Δu_ε − f(u_ε) + T(|x|) = 0 over radially symmetric domains with no-flux boundary conditions are discribed. Particular emphasis is placed on the characterization of points of discontinuity of these limits (interfaces) and on the description of the graph of…
Abstract This paper describes the method used to produce a Si 3 N 4 standard for use as a reference material in XPS measurements of silicon nitride related compounds. The reference material was made by high dose ion implantation of N + into a (100) Si wafer and annealing the wafer at 1150°C. Rutherford back‐scattering…
Synthesis of zirconium boride, ZrB 2 , from zirconium borohydride, Zr(BH 4 ) 4 , has been explored by a variety of methods, including chemical vapor deposition (CVD) in a hot tube, laser CVD with both continuous‐wave (cw) and pulsed lasers, and cw‐laser synthesis of fine powders. In all cases, ZrB 2 was the only cryst…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of cellulose. 2. Low-energy crystalline arrangementsIstvan Simon, Leslie Glasser, Harold A. Scheraga, and R. S. John ManleyCite this: Macromolecules 1988, 21, 4, 990–998Publication Date (Print):April 1, 1988Publication History Published online1 May 2002Published in…
We point out for the first time that the classical Lehmann effect, which arises when a temperature gradient is applied parallel to the helical axis of a cholesteric droplet, is not only due to a dynamic cross-coupling between director orientation and temperature, but has also a static contribution. In addition it is d…
Physical and chemical characterizations of vitreous oxides were performed utilizing several techniques. The microstructure of is estimated from IR absorption spectra. As a result, it is suggested that micro structural change occurs at a composition of ca. in the system with a transformation from to short‐range order w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic and magnetic properties of nickel-substituted rubredoxin: a variable-temperature magnetic circular dichroism studyAndrzej T. Kowal, Isabel C. Zambrano, Isabel Moura, Jose J. G. Moura, Jean LeGall, and Michael K. JohnsonCite this: Inorg. Chem. 1988, 27, 7, 1162–116…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrazine and pyridine complexes of copper(II) trifluoromethanesulfonate. Crystal structure of tetrakis(pyridine)bis(trifluoromethanesulfonato-O)copper(II) and magnetic exchange in (pyrazine)bis(trifluoromethanesulfonato-O)copper(II)John S. Haynes, Steven J. Rettig, John R. S…
Abstract The theory of coalescence in melts of polymer blends was derived on the basis of the Smoluchowski theory for colloid systems. An approximation for a flux of particles used for solutions of colloids in water was analyzed. It is shown that this approximation cannot be used for polymer blends, and an approximati…
Abstract A new attempt of utilizing solid acid to the cross aldol reaction of silyl enol ethers with aldehydes or acetals has been investigated. Among solid acids employed, the reaction is promoted most effectively by a catalytic amount of aluminium ion-exchanged montmorillonite (Al-Mont). Simple diastereoselection is…
Magnetism: a primer and reviewS Saini, RB Frankel, DD Stark and JT Ferrucci, JrAudio Available | Share
The zero-temperature phase diagram of mixed-stack charge-transfer crystals is investigated through a diagrammatic valence-bond technique. The direct solution of the single-chain Hubbard Hamiltonian inclusive of intersite Coulomb interactions constitutes the basis for a perturbative, adiabatic treatment of the electron…
During the past year, a dedicated triple-axis powder diffractometer has been in routine operation at the Brookhaven National Synchrotron Light Source as a user-oriented facility. The diffractometer is designed to allow easy interchange between energy-dispersive and monochromatic beam experiments. In the latter mode of…
Polytitanates in the BaO‐TiO 2 system with Ba: Ti ratios ranging from 1:2 to 1:5 were prepared employing the liquid mix technique. The samples were heated at 600° to 1300°C in oxygen, and Raman spectroscopy was used to investigate the phase relations in the system. The powders of various compounds were amorphous at te…
Abstract Size of colloidal CdS particles in aqueous medium was controlled by adding thiols in the procedure of the preparation. The change in optical absorption spectra and the quantum yield of photoinduced electron transfer were measured for these size-controlled CdS colloids.
Abstract New bismaleimides containing ether bonds were prepared. The thermal properties of the bismaleimides were investigated by differential scanning calorimetry (DSC). The effects of structure of the bismaleimides and curing conditions on the thermal and mechanical properties of the cured resins such as initial dec…