Materials Literature
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Abstract Fourier‐transform infrared spectral studies of an amorphous linear aromatic polyurethane at various temperatures were performed. Hydrogen bonding was studied in the NH stretching (3347 cm −1 ) and the bending (1535 cm −1 ) regions, using the band decomposition technique. The variations with temperature are u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Free Polymer on the Structure of a Polymer Brush and Interaction between Two Polymer BrushesC. M. Wijmans, E. B. Zhulina, and G. J. FleerCite this: Macromolecules 1994, 27, 12, 3238–3248Publication Date (Print):June 1, 1994Publication History Published online1 May…
Dense Sic ceramics were obtained by pressureless sintering of β‐Sic and α‐Sic powders as starting materials using Al 2 O 3 ‐Y 2 O 3 additives. The resulting microstructure depended highly on the polytypes of the starting SiC powders. The microstructure of SiC obtained from α‐SiC powder was composed of equiaxed grains,…
We present a spectroscopic overview of ${\mathrm{Cr}}^{4+}$-doped ${\mathrm{Y}}_{3}$${\mathrm{Al}}_{5}$${\mathrm{O}}_{12}$ (YAG), a new laser material for the near-infrared region (NIR). It is found that only 2% of the Cr ions are tetrahedrally coordinated ${\mathrm{Cr}}^{4+}$. However, the optical spectra are dominat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn situ x-ray diffraction study of crystallization kinetics in PbZr1-xTixO3, (PZT, x = 0.0, 0.55, 1.0)Angus P. Wilkinson, James S. Speck, Anthony K. Cheetham, Srinivasan Natarajan, and John Meurig ThomasCite this: Chem. Mater. 1994, 6, 6, 750–754Publication Date (Print):June…
Two different kinds of europium(III) chelates, luminescent and nonluminescent, were prepared. The chelates were coupled to bioanalytical reagents, such as antibodies, after activations of the amino group on the chelates with thiophosgene,2,4,6-trichloro-1,3,5-triazine, or iodoacetic anhydride. The reactivities of the…
Abstract Poly(vinylidene difluoride) (PVDF) films were irradiated by means of heavy ions (in the electronic stopping‐power range) and electrons. Both types of ionizing radiation induce in the polymer film ionizations and excitations, but swift heavy ions induce a huge density of excitations and ionizations along the i…
A methodology for the straightforward and consistent evaluation of the constituent properties of ceramic‐matrix composites (CMCs) is summarized, based on analyses from the literature. The results provide a constitutive law capable of simulating the stresshain behavior of these materials. The approach is illustrated us…
A thermodynamically stable face-centred icosahedral phase with a pentagonal dodecahedral solidification morphology has been found in Zn[sbnd]Mg[sbnd]RE (RE [tbnd] Y, Tb, Dy, Ho or Er) alloys. We report here the structure, stability and morphology in this new group of icosahedral alloys on the basis of results for the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Characterization of Sol-Gel Derived Oxycarbide Glasses. 1. Study of the Pyrolysis ProcessLaurence Bois, Jocelyne Maquet, Florence Babonneau, Hubert Mutin, and Djamilha BahloulCite this: Chem. Mater. 1994, 6, 6, 796–802Publication Date (Print):June 1, 1994Publicati…
A systematic investigation of monatomic spherical sorbates in the supercages of zeolites Y and A by molecular dynamics technique is presented. Rates of intercage diffusion, rates of cage visits, and the diffusion coefficients have been calculated as a function of the sorbate-zeolite interaction strength. These propert…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced Electron- and Energy-Transfer Processes Occurring within Porphyrin-Metal-Bisterpyridyl ConjugatesJean-Paul Collin, Anthony Harriman, Valerie Heitz, Fabrice Odobel, and Jean-Pierre SauvageCite this: J. Am. Chem. Soc. 1994, 116, 13, 5679–5690Publication Date (Prin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly Active Manganese-Containing Polyoxometalate as Catalyst for Epoxidation of Alkenes with Hydrogen PeroxideRonny Neumann and Mohammad GaraCite this: J. Am. Chem. Soc. 1994, 116, 12, 5509–5510Publication Date (Print):June 1, 1994Publication History Published online1 May…
We have investigated the influence of the interaction range on the shape of the phase diagram in a system of particles that interact via a hard-sphere potential plus an attractive Yukawa interaction. The gas–liquid phase diagram is evaluated both by Gibbs ensemble Monte Carlo simulation and reference hypernetted chain…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT"Smart" Cascade Polymers. Modular Syntheses of Four-Directional Dendritic Macromolecules with Acidic, Neutral, or Basic Terminal Groups and the Effect of pH Changes on Their Hydrodynamic RadiiJames K. Young, Gregory R. Baker, George R. Newkome, Kevin F. Morris, and Charles S…
The range of validity and the accuracy of scalar diffraction theory for periodic diffractive phase elements (DPE’s) is evaluated by a comparison of diffraction efficiencies predicted from scalar theory to exact results calculated with a rigorous electromagnetic theory. The effects of DPE parameters (depth, feature siz…
Measurements of the magnetic moment and susceptibility of diamond, graphite along and perpendicular to the c axis, ${\mathrm{C}}_{60}$, and carbon nanotubes are reported as a function of magnetic field (0H55 kOe) and temperature (4.5 KT310 K). The data on ${\mathrm{C}}_{60}$ are diamagnetic, confirm previous results,…
Polarizabilities and hyperpolarizabilities and their frequency dispersions are calculated for para-nitroaniline immersed in solution using a reaction field response model. Single- and multiconfigurational wave functions are self-consistently optimized in the presence of the reaction field of the solvent and used as re…
Composition and temperature of ferroelectric La-doped lead zirconate titanate ceramics influence its electric fatigue behavior, defined as the degradation of the electrical properties under the action of an ac field applied for a long time. Compositions of rhombohedral symmetry exhibit little or no fatigue compared wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Properties of Novel Water-Soluble Conducting Polyaniline CopolymersMy T. Nguyen, Paul Kasai, James L. Miller, and Arthur F. DiazCite this: Macromolecules 1994, 27, 13, 3625–3631Publication Date (Print):June 1, 1994Publication History Published online1 May 2002P…