Materials Literature
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The phase diagram of a two-dimensional system consisting of colloids is investigated within the Kosterlitz-Thouless-Halperin-Nelson-Young theory of dislocation-mediated two-dimensional melting. We also present results for the interaction energy, the phonon spectrum, and the longitudinal and transverse sound velocity f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic model for tensile deformation of polymersYves Termonia and Paul SmithCite this: Macromolecules 1987, 20, 4, 835–838Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published inissue 1 April 1987https://pubs.acs.org/doi/10.1021/ma001…
Deacetoxycephalosporin C synthetase (expandase), which catalyzes ring expansion of penicillin N to deacetoxycephalosporin C (DAOC), has been stabilized in vitro and purified to near homogeneity from the industrially important fungus Cephalosporium acremonium. Throughout the purification, the expandase activity remaine…
This review is concerned with the fundamentals of the theory of the transport of atoms through crystalline solids, such as may result from the existence of gradients of chemical and isotopic composition, electrical potential, stress, temperature, etc. The main emphasis is on the statistical description of these proces…
The electronic spectrum and eigenstates of a one-dimensional aperiodic Thue-Morse crystal isstudied with an on-site tight-binding model. The relation between the constructing elements andthe hierarchical splitting of the bands into subbands is analysed. The eigenstates are shown to be much more similar to those of a p…
Abstract The structure of ethylene copolymers modified by α‐olefins has become an area of intense investigation since the successful commercialization of so‐called linear low‐density polyethylene (LLDPE) resins. The molecular structure of a series of typical commercial LLDPE copolymers was investigated and compared to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSuperconductivity above liquid nitrogen temperature: preparation and properties of a family of perovskite-based superconductorsE. M. Engler, V. Y. Lee, A. I. Nazzal, R. B. Beyers, G. Lim, P. M. Grant, S. S. P. Parkin, M. L. Ramirez, J. E. Vazquez, and R. J. SavoyCite this: J…
Abstract The underpotential deposition of Cu onto Au(111) in different electrolytes has been investigated by LEED, RHEED and AES. Ordered layers of (√3 × √3) R30° and (2.2 × 2.2) type were found for Cu at medium coverages in sulfate and perchlorate solutions, respectively. The formation of different superstructures in…
A high-resolution infrared spectroscopic investigation of structure related to the O-H dipole stretching mode (around 3500 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$) was carried out in ${\mathrm{SrTiO}}_{3}$. We discuss various models for the position of the hydrogen impurity in the matrix and justify the position th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscosity of the eutectic dilithium carbonate-disodium carbonate-dipotassium carbonate meltTatsuhiko Ejima, Yuzuru Sato, Tsutomu Yamamura, Kyoko Tamai, mayasayuki Hasebe, Mark S. Bohn, and George J. JanzCite this: J. Chem. Eng. Data 1987, 32, 2, 180–182Publication Date (Prin…
Polyimide precursors were synthesized from a diamine and a diacid chloride that was derived from the reactant with promellitic dianhydride and o-nitrobenzyl alcohol. Their thermal properties were studied in nitrogen using dynamic thermogravimetry, and the photoreaction mechanism was investigated by ultraviolet and inf…
Prony's method is usually used for the determination of poles from experimental data in the singularity expansion method (SEM) literature, It is the aim here to show that this is not the best method and that Jain's pencil-of-functions (POF) method can be generalized to provide a better method. An example of such a met…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of bis(imidazole)(meso-tetraphenylporphinato)iron(III) chloride. A classic molecule revisitedW. Robert Scheidt, Sarah R. Osvath, and Young Ja LeeCite this: J. Am. Chem. Soc. 1987, 109, 7, 1958–1963Publication Date (Print):April 1, 1987Publicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic and vibrational spectra of Ru2(carboxylate)4 + complexes. Characterization of a high-spin metal-metal ground stateVincent M. Miskowski, Thomas M. Loehr, and Harry B. GrayCite this: Inorg. Chem. 1987, 26, 7, 1098–1108Publication Date (Print):April 1, 1987Publicatio…
Preparation d'une poudre de PbTiO 3 par precipitation d'une solution aqueuse de Pb(NO 3 ) 2 , TiCl 4 et NH 4 OH. Preparation de composites flexibles par incorporation de la poudre dans un gel polymere dielectrique. Proprietes dielectriques et piezoelectriques de ces composites
The methods to estimate the surface tension of polymer solids using contact angles have been reviewed in the first part. They are classified into the following three groups depending on the theories or the equations applied: (1) the methods using the Young's equation alone, (2) the methods using the combined equation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAromatic-aliphatic azomethine ether polymers and fibersPaul W. WojtkowskiCite this: Macromolecules 1987, 20, 4, 740–748Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published inissue 1 April 1987https://pubs.acs.org/doi/10.1021/ma00170a0…
Abstract Creep experiments on two thermoplastics at constant values of tensile stress, temperature, and relative humidity previously reported for 132,000 h were continued to about 230,000 h. An equation of the form ϵ = ϵ o + ϵ + t n was used to predict the creep, where t is time and ϵ o , ϵ + , and n are constants for…
Experimental melt data are compared with differential constitutive equations that contain only a single adjustable parameter, besides the parameters describing the linear relaxation spectrum. These include the equations of Giesekus, Phan-Thien and Tanner, Johnson and Segalman, White and Metzner, Larson, and Acierno et…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemically induced charge separation at the molecular level. A chromophore-quencher complex containing both an electron donor and an acceptorEarl Danielson, C. Michael Elliott, Jon W. Merkert, and Thomas J. MeyerCite this: J. Am. Chem. Soc. 1987, 109, 8, 2519–2520Public…