Materials Literature
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Abstract Differential scanning calorimetry, Fourier transform infrared, and solid‐state carbon 13 nuclear magnetic resonance were used to study the silane coupling agent/epoxy resin interface. Penetration of epoxy into the hydrolyzed silane has been shown. The addition of a solvent can further increase the penetration…
Hydrogenated amorphous carbon (HAC) grains consist of graphitic islands randomly oriented to form a larger particle. These islands (which may be considered to be PAH-like) are poorly connected to each other with respect to energy transfer. An analysis of energy transfer between graphitic islands in HAC shows that abso…
Polymer-dispersed liquid crystal (PDLC) films are potentially useful for electronic displays, windows with electrically controllable light transmission, and other applications. PDLC film performance may depend strongly on the angular distribution of the light scattered by the films. We have measured the angular distri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentacoordinate iron-sulfur complexes. Structure and spectroscopic and electrochemical properties of phenoxy- and thiophenoxy-bridged binuclear complexesB. S. Kang, L. H. Weng, D. X. Wu, F. Wang, Z. Guo, L. R. Huang, Z. Y. Huang, and H. Q. LiuCite this: Inorg. Chem. 1988, 27…
Using a combination of Monte Carlo and analytical techniques we present an analysis of the random-walk problem of a particle diffusing in a system with energetic disorder. The particle is allowed to hop anywhere in the lattice and the rates vary exponentially with distance. We consider the number of new sites visited,…
The role that substrate surface properties play in influencing the extent of endothelialization of polymer surfaces has been investigated. For a wide range of polymer surfaces, the degree of endothelialization for both porcine and bovine endothelial cells is directly related to polymer surface tension: increased endot…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnhanced kinetic resolution and enzyme-like shape selectivityPaul R. Carlier, William S. Mungall, Georg. Schroder, and K. Barry. SharplessCite this: J. Am. Chem. Soc. 1988, 110, 9, 2978–2979Publication Date (Print):April 27, 1988Publication History Published online1 May 2002…
The structure of the serine endopeptidase proteinase K (279 amino acid residues; 28,790 daltons) has been refined by restrained least-squares methods to a conventional R value of 16.7% employing synchrotron film data of 30,812 reflections greater than 3 sigma in the 5.0 to 1.5 A resolution range. During refinement, th…
A transmission electron microscopy study has revealed (111) twins in cubic/tetragonal BaTiO3 ceramics. The relation between the lattices in the bicrystal is described by a coincident site lattice cell with Σ = 3. By considering the structure of BaTiO3, the formation of a twin can be understood as a shear operation wit…
Abstract The modification of bismaleimide resins with carboxyl‐terminated butadiene–acrylonitrile rubbers (CTBN) was studied. The effects of the rubbers on mechanical and thermal properties such as flexural strength, tensile strength, fracture toughness, glass transition temperature, and decomposition temperature of t…
Surface charge measurements on alumina and polymer insulators were carried out after stressing them with DC voltages in a high vacuum. The order of magnitude of surface charge density was found to be the same for materials with supposedly widely varying secondary-emission yields. Surface coatings on alumina insulators…
A susceptibility formalism is developed for analyzing the magnetic and quadrupolar interactions in hexagonal and tetragonal rare-earth compounds. Symmetrized expressions are given for the one-ion magnetoelastic coupling and for the two-ion quadrupolar interactions. This formalism, derived from perturbation theory, lea…
In previous studies it has been established that in Escherichia coli the three known subunits of anaerobic nitrate reductase are encoded by the narGHI operon. From the nucleotide sequence of the narI region of the operon we conclude that, in addition to the narG and narH genes, the nar operon contains two other open r…
The crystal structure of optically active microbial poly(D(-)-beta-hydroxybutyrate) has been refined with the Rietveld whole-fitting method applied to powder X-ray diffraction data. This natually occurring polymer gives rise to a very crystalline phase and therefore to very detailed and resolved powder profiles. Relia…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure and spectroscopic properties of the reduced and reduced protonated forms of lutetium diphthalocyanineMehdi Moussavi, Andre De Cian, Jean Fischer, and Raymond WeissCite this: Inorg. Chem. 1988, 27, 7, 1287–1291Publication Date (Print):April 1, 1988Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and unusual properties of a helically twisted multiply metalated rubrene derivativePaul J. Fagan, Michael D. Ward, Jonathan V. Caspar, Joseph C. Calabrese, and Paul J. KrusicCite this: J. Am. Chem. Soc. 1988, 110, 9, 2981–2983Publication Date (Print):April 27, 1988…
A series of experiments was conducted to study in vitro and in vivo metal ion release and the urine excretion of metal ions. Metal salts were injected and urine analyzed. Anodic potentials were applied to stainless steel and cobalt-chromium-molybdenum (CCM) specimens to cause an acceleration of corrosion rates. Corros…
Using real-space renormalization-group techniques, an exact decimation transformation has been derived for the parameters characterizing the phonon or tight-binding properties of a one-dimensional quasicrystal, the Fibonacci chain, for the discrete rescaling factor \ensuremath{\tau} (the golden mean). A Green's functi…
Rotational viscosity and spontaneous polarization are the most important properties of a ferroelectric liquid crystal with regard to its switching time in surface stabilized or a.c. field stabilized displays. Whereas there is an abundant literature about spontaneous polarization, only a few attempts have been made to…
Excellent bistability was demonstrated in a ferroelectric liquid crystal electrooptic device prepared using polyimide Langmuir-Blodgett films for the orientation of the liquid crystals without performing rubbing.