Materials Literature
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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…
In a polycrystalline material it is usual for three grains, and therefore three grain boundaries, to meet on a line, the ‘triple line’. Since grain boundaries can be interpreted as dislocation networks, a question arises about the dislocation balance at the triple line. It is shown that, if the dislocation balance is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase separation by spinodal decomposition in polycarbonate/poly(methyl methacrylate) blendsThein Kyu and Jeanne M. SaldanhaCite this: Macromolecules 1988, 21, 4, 1021–1026Publication Date (Print):April 1, 1988Publication History Published online1 May 2002Published inissue 1…
The operative and controlling mechanisms of steady‐state creep in sintered α‐SiC have been determined both from kinetic data within the ranges of temperature and constant compressive stress of 1670 to 2073 K and 138 to 414 MPa, respectively, and from the results of extensive TEM and other analytical analyses. Dislocat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilute solution behavior of 3-arm asymmetric and regular 3- and 12-arm polystyrene starsNitya Khasat, Robert W. Pennisi, Nikos Hadjichristidis, and Lewis J. FettersCite this: Macromolecules 1988, 21, 4, 1100–1106Publication Date (Print):April 1, 1988Publication History Publi…
Thermochromism and anomalous temperature dependence of emission spectra have been observed in poly(3-alkylthiophene) films, and are explained in terms of the transition of poly(3-alkylthiophene) conformation. The spectral change by laser irradiation and its memory have also been confirmed. The application of this phen…