Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of cellulose. 1. Low-energy conformations of single chainsIstvan Simon, Harold A. Scheraga, and R. S. John ManleyCite this: Macromolecules 1988, 21, 4, 983–990Publication Date (Print):April 1, 1988Publication History Published online1 May 2002Published inissue 1 Ap…
In principle the analysis of positions and shapes of diffraction peak profiles can reveal the imperfect crystalline structure of a sample. The parameters 'size' and 'strain' as obtained from the established Warren-Averbach method need to be used cautiously: in essence the order-independent and order-dependent parts of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of lithium perchlorate on the properties of polyether networks: specific volume and glass transition temperatureJean Francois Le Nest, Alessandro Gandini, Herve Cheradame, and Jean Pierre Cohen-AddadCite this: Macromolecules 1988, 21, 4, 1117–1120Publication Date (…
The dynamic response of surface-stabilized ferroelectric liquid crystals was studied on the basis of a continuum theory. In this work, polarization electric field was consistently introduced through Poisson's equation, including the polarization charge accompanied by an elastic deformation. An improved anchoring energ…
A thin layer of dye sandwiched between p-CuCNS deposited on a copper substrate and n-SnO 2 coated transparent glass was found to yield photocurrents resulting from light absorption in the dye. The mechanism of photocurrent generation is discussed.
Results of an investigation into the withstand voltage characteristics of a UHV-class tension insulator string covered with snow are reported. AC withstand voltage tests were conducted in a testing room and at an exposure testing station constructed in a heavy snow area. For insulator strings up to 10 m long, the with…
Abstract The kinetics and the morphology of selective dissolution of alloys containing a noble component and of pitting of passive metals are discussed emphasizing common properties of both localized dissolution processes. Dealloying of CuAu(Pd)‐alloys and pitting of aluminum and aluminum alloys are considered as typi…
We recorded fluorescence excitation and emission spectra of uro- and coproporphyrin under different experimental conditions, to see how these conditions influence quantifications based on measurement of fluorescence intensity. We found that, for bands alpha and beta of the emission spectra and the main peak of the exc…
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…