Materials Literature
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We report the results of a molecular dynamics computer simulation of particles interacting via the Gay-Berne potential with parameters selected to approximate those of mesogenic molecules. The system was found to form a variety of mesophases as the temperature was lowered. We have characterized these phases with the a…
It was found that a local charge-transfer excitation on the donor(D)-acceptor(A) pair leads to a semimacroscopic valence change from the quasi-ionic (${\mathit{D}}^{+}$${\mathit{A}}^{\mathrm{\ensuremath{-}}}$) to quasineutral (${\mathit{D}}^{0}$${\mathit{A}}^{0}$) states in organic molecular-compound TTF-chloranil wit…
Calculations of Mott elastic scattering cross section of electrons for most elements of the periodic table up to element number 94 in the energy range 20 eV–20 keV have been performed. The Dirac equation transformed to a first-order differential equation was solved numerically. The influence of the choice of atomic po…
The high spatial resolution imaging of magnetic microstructure has important ramifications for both fundamental studies of magnetism and the technology surrounding the magnetic recording industry. One technique for imaging surface magnetic microstructure on the 10-nm-length scale is scanning electron microscopy with p…
A method for mounting single crystals in macromolecular crystallographic studies is described in which the crystal is suspended in a thin film. The film is formed from a mixture of the crystallization buffer and a hydrophilic viscous material, confined within a thin-wire loop by surface tension. Compared with conventi…
A listing of the Euclidean normalizers for triclinic and monoclinic space groups having translation lattices with specialized metric is given. These normalizers have not been included in previous tabulations. For convenience, in the case of monoclinic space groups, only the second setting (c-axis unique) is considered…
First experiences in using the new computer-graphics program PEANUT for visualization and real-time manipulation of atomic anisotropic displacement parameters (ADP's) are illustrated by several examples. Kinematic and mixed kinematic-dynamic models of molecular motion in crystals are derived from observed ADP's in an…
First-principles calculations of the shear modulus tensor are presented for the bcc crystalline and rapidly quenched Coulomb solids produced by the Monte Carlo simulation method. The shear moduli are calculated for temperatures up to the melting conditions, including the effects of thermal fluctuations. An effective s…
New highly sensitive thermoluminescence detectors of universal application on the basis of anion-defect a-Al2O3:C single crystals have been developed. The decisive role of non-stoichiometry in forming luminescence properties of crystals has been ascertained by methods of optical, luminescent and exoemission spectrosco…
Copper nitride thin films were prepared by using the ion-assisted deposition in which accelerated nitrogen ions were irradiated during the deposition of copper metal. The degree of nitrification of the film was controlled by changing the ion current density. The reflection coefficient of the prepared copper nitride fi…
Gd(hfac),NITiPr (hfac = hexafluoroacetylacetonate;N ITiPr = 2-isopropyl-4,4,5,5-tetramethyl-4,5-dihy1rH o--i midazolyl-l- oxy1 3-oxide) crystallizes in the monoclinic space group P 2 , / n with cell parameters a = 11.916 (1) A, b = 17.625 ( 9 ) A, c = 18.055 ( I ) A, j3 = 96.98 (I)’, V = 3763.82 A’, and Z = 4. The str…
Abstract Samples of Na-saturated, Upton montmorillonite were prepared with different contents of water (H 2 O or D 2 O) by: (1) adsorption of water from the vapor phase at a specific value of p/p°, the relative humidity, (2) adsorption of water from the vapor phase at p/p° = 1.0 followed by desorption of the water int…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of poly(iε-caprolactone)Hengliang Hu and Douglas L. DorsetCite this: Macromolecules 1990, 23, 21, 4604–4607Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue 1 October 1990https://pubs.acs.org/doi/10.1021…
Volatility diagrams—isothermal plots showing the partial pressures of two gaseous species in equilibrium with the several condensed phases possible in a system—are discussed for the Si‐O and Si‐N systems, and extended to the Si‐N‐O and Si‐C‐O systems, in which the important ceramic constituents SiO 2 , Si 3 N 4 , Si 2…
Abstract In this investigation, the plastic flow of polycarbonate (PC) was examined by obtaining true stress‐strain data over a range of strain rates at room temperature through homogeneous, uniaxial, constant strain rate compression testing to strains as high as 125 percent. Uniaxial compressive loading conditions gi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProtein microencapsulation of nonaqueous liquidsKenneth S. Suslick and Mark W. GrinstaffCite this: J. Am. Chem. Soc. 1990, 112, 21, 7807–7809Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue 1 October 1990https://pubs.acs…
Human coronavirus (HCoV) infection causes respiratory diseases with mild to severe outcomes. In the last 15 years, we have witnessed the emergence of two zoonotic, highly pathogenic HCoVs: severe acute respiratory syndrome coronavirus (SARS-CoV) and ...Read More
Abstract Careful curve fitting is needed when using XPS to investigate oxidized functional groups on carbon‐fibre surfaces. This is important because the core regions often contain a number of overlapping features some of which are of low intensity, and the C 1s region is influenced by an asymmetric graphitic feature.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotential dependence of the conductivity of highly oxidized polythiophenes, polypyrroles, and polyaniline: finite windows of high conductivityDavid Ofer, Richard M. Crooks, and Mark S. WrightonCite this: J. Am. Chem. Soc. 1990, 112, 22, 7869–7879Publication Date (Print):Octo…
The low‐field electrical behavior of relaxor ferroelectric ceramics has been qualitatively described by many parameters, including diffuseness (δ), which characterizes the breadth of the transition peak and is roughly related to the standard deviation of the peak. Three major types of equations have been used to calcu…