Materials Literature
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Cosublimation of 1,3- and 1,4-benzene-bis(1,2,3,5-dithiadiazolyl) and iodine/bromine affords crystals of the mixed valence salts 1,3- and 1,4-[(S2N2C)C6H4(CN2S2)][X] (X = I, Br). The crystal structures of the two iodide salts consist of perfectly superimposed stacks of molecular units with interannular spacing along t…
The different routes for the synthesis of aluminum nitride (AIN) powders are reviewed: the different industrial techniques from both the direct nitridation of aluminum metal and the carbothermal nitridation of alumina, and also other synthesis routes not industrially developed up to now. This paper presents a comprehe…
In this paper, piezoelectric properties of (Bi1/2Na1/2)1–x (Sr1/2Ca1/2) x TiO3 system were studied from the viewpoint of lead-free piezoelectric materials. To improve electromechanical properties in this system, MnO was added to this system. In the composition of x = 0.13 which was close to morphotropic phase boundary…
The operative damage mechanisms in a series of C‐matrix composites loaded in tension and shear have been investigated. The composites contained either C fibers or Nicalon fibers, both with and without a carbon coating. The matrix consisted primarily of ex‐phenolic carbon with a final carbon layer introduced by chemica…
Abstract Quantitative x‐ray analysis of spherical inclusions embedded in a matrix is not possible using the classical ZAF and ϕ(ρ)Z methods based on specimens of homogeneous composition. Gauvin et al . (1992) have demonstrated that Monte Carlo simulations can be used to perform quantitative analysis of spherical inclu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleComments on "Redox Processes on Pure Ceria and Rh/CeO2 Catalyst Monitored by X-ray Absorption (Fast Acquisition Mode)S. Bernal, J. J. Calvino, G. A. Cifredo, and J. M. Rodriguez-IzquierdoCite this: J. Phys. Chem. 1995, 99, 30, 11794–11796Publication Date (Print):July 1, 1995Publ…
The addition of sintering additives to silicon carbide particles by electrostatic adsorption of colloidal A1 2 O 3 and Y 2 O 3 sols has been studied as a way to achieve an optimum homogeneity in the microstructure. The adsorption behavior of the sol particles was examined by electrophoretic measurements and X‐ray fluo…
Abstract Monofunctional phthalocyanines 7a,b , one bearing a sulfo and the other one a carboxyl group, were synthesized by lithium alkoxyde‐catalyzed statistical tetramerization of 4‐(4‐ tert ‐butylphenoxy)‐1,2‐benzenedicarbonitrile ( 3c ) with 1,2‐dicyanobenzenes 3a,b carrying a carboxyl or sulfo group. Tribenzonapht…
Based on biochemical and ultrastructural data, hyphochytriomycetes are believed to share an ancestor with oomycetes and heterokont algae. In order to study the phylogeny of the hyphochytriomycetes, we determined both the small- and large-subunit ribosomal RNA sequence of Hyphochytrium catenoides. Phylogenetic trees we…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNovel Synthetic Routes to Carbon NitrideM. Todd, J. Kouvetakis, T. L. Groy, D. Chandrasekhar, David J. Smith, and P. W. DealCite this: Chem. Mater. 1995, 7, 7, 1422–1426Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 19…
Abstract The 2,2′-bi-1H-imidazole (H2BIM) derivatives were studied from the point of the interplay of proton-transfer (PT) and electron (charge)-transfer (CT) interactions. Seven new states among the speculated 25 independent species were identified based on the study of their redox and acid dissociation properties. I…
The influence of chirality on the nonlinear optical properties of poly(isocyanide)s is examined. It is found that the chiral and nonlinear properties can occur on different levels of the molecular structure and can therefore be separately tuned, but that they still can be coupled together. The NLO properties of chiral…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoating Polystyrene Particles by Adsorption of Hydrophobically Modified DextranC. Fournier, M. Leonard, I. Le Coq-Leonard, and E. DellacherieCite this: Langmuir 1995, 11, 7, 2344–2347Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published…
Poly(viny1 alcohol) (PVA) and citric acid (CA) are a commonly used binder and dispersant, respectively, for aqueous Al 2 O 3 slurries. The competitive adsorption of these additives on A1 2 O 3 from aqueous solution was studied, as was the influence of this competition on the binder migration in centrifugally cast comp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectroscopy and vibrational relaxation of CHx and CDx stretches on synthetic diamond nanocrystal surfacesH.-C. Chang, J.-C. Lin, J.-Y. Wu, and K.-H. ChenCite this: J. Phys. Chem. 1995, 99, 28, 11081–11088Publication Date (Print):July 1, 1995Publication History Publ…
We calculate the lubrication force that acts in the normal direction between spherical surfaces bearing grafted polymer brushes and immersed in a viscous fluid. Brinkman's equation is employed to describe the flow in the brushes. For noncompressed brushes we include a slip approximation that applies to poorly permeabl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActive Sites on SiO2: Role in CH3OH DecompositionEdward A. Wovchko, John C. Camp, John A. Glass Jr., and John T. YatesCite this: Langmuir 1995, 11, 7, 2592–2599Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 1995htt…
Quasielastic neutron scattering measures ia a very direct way the decay of density correlations in the time range psec … nsec and on length scales of the order of ångströms. It seems therefore ideally suited to directly observe the critical dynamics predicted by the mode coupling theory of the glass transition. We rev…
A simple synthetic method for preparing aragonite whiskers has been developed. A suspension of CaCl 2 ‐MgCl 2 ‐Mg(OH) 2 with pH ∼9 has been prepared by adding Ca(OH) 2 to MgCl 2 aqueous solution. CaCO 3 whiskers (aragonite phase) have been prepared easily by blowing CO 2 ‐containing gas into the suspension. The whiske…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAppraisal of Chemical Bond Making, Bond Breaking, and Electron Transfer in Solution in the Light of the Principle of Maximum HardnessPratim K. Chattaraj, Andres Cedillo, Robert G. Parr, and Edward M. ArnettCite this: J. Org. Chem. 1995, 60, 15, 4707–4714Publication Date (Pri…