Chemical synthesis of conducting polypyrrole and some composites
The oxidation of pyrrole to conducting polypyrrole by iron(III) salts represents a valid and more versatile alternative to the usual anodic oxidation.
Materials Literature
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Structural aspects of metal-oxide-pillared sheet silicates. An investigation by magic-angle-spinning nuclear magnetic resonance, fourier-transform infrared spectroscopy and powder X-ray diffractometry
Variable-temperature powder X-ray diffractometry, Fourier-transform infrared spectroscopy and 27Al and 29Si magic-angle spinning nuclear magnetic resonance spectroscopy have been used to elucidate both the nature of alumina pillars introduced into sheet aluminosilicate and to monitor changes in structure of the host m…
Low-density phase diagram of the two-dimensional Coulomb gas
The phase diagram of the two-dimensional classical Coulomb gas is investigated by Monte Carlo simulations. We show that in the fluid phase this system undergoes the expected Kosterlitz-Thouless transition at very low densities and that the Kosterlitz-Thouless transition becomes a first-order phase transition between a…
Frustration in bilayers and topologies of liquid crystals of amphiphilic molecules
Amphiphilic molecules are well-known for their ability to build symmetric fluid films, or bilayers, most often organized in lamellar phases. The symmetric changes of curvatures of the two interfaces of a bilayer, as temperature and water content vary, may enter into conflict with the compactness of the bilayer core. W…
N.M.R. proton lineshape in (TMTSF)2X : incommensurability of nesting vector and order parameter
For the first time, in the SDW state of the organic conductors (TMTSF) 2PF 6 and (TMTSF)2ClO4, the nesting vector Q is determined from a detailed analysis of the methyl proton N.M.R. lineshape for various magnetic field orientations. The amplitude δ of the order parameter is determined with a precision superior to tha…
A Further Improvement in the Gaussian ϕ(ϱ) Approach for Matrix Correction in Quantitative Electron Probe Microanalysis
Abstract An improved correction model for quantitative electron probe microanalysis, based on modifications of the Gaussian ϕ(ϱ) approach, originally introduced by Packwood and Brown , is presented. The improvements consist of better equations for the input parameters of this model which have been obtained by fitting…
Electron-molecular vibration coupling in 2-D organic conductors : high and low temperature phases of α-(BEDT-TTF)2I3
The polarized infrared (400-4 000 cm-1) absorption spectra of single crystals of the α form of (BEDT-TTF)2I3 are reported for the high temperature conducting phase at T = 300 K and for the low temperature semiconducting one at T = 20 K. For comparison and to supplement the already available data, the conductivity spec…
Existence of needle crystals in local models of solidification
The way in which surface tension acts as a singular perturbation to destroy the continuous family of needle-crystal solutions of the steady-state growth equations is analyzed in detail for two local models of solidification. All calculations are performed in the limit of small surface tension or, equivalently, small v…
Boron-rich solids
This report contains papers on research with boron-rich solids. These papers main describe the following topics: electronic structure; electronic and optical properties; superconductivity; crystal structure; magnetic properties; vibrational properties; thermal and elastic properties; phase diagrams; materials; prepara…
The Crystal and Molecular Structures of Bis(ethylenedithio)tetrathiafulvalene
Abstract The X-ray crystal structure analysis of a sulfur containing π-donor molecule, bis(ethylenedithio)tetrathiafulvalene, (BEDT-TTF) shows that the BEDT-TTF molecule is nonplanar and that the crystal is composed of pairs of BEDT-TTF.
Low-Energy Electron Diffraction
Abstract Low-energy electron diffraction (LEED) is a technique for investigating the crystallography of surfaces and overlayers adsorbed on surfaces. This article describes the principles of diffraction from surfaces, and elucidates the method of sample preparation to achieve diffraction patterns. The article describe…
Paper 21. Iron, nickel and chromium mass balances in Westinghouse PWR primary circuits
Introduction Basis of Mass Balance Method Calculation of Removals External Sources Data from Examination of Oxide Layers on Primary Circuit Components Completion of Mass Balances by Predicting Nett Releases from Circuit Alloys Estimation of Nett Corrosion Releases from Chromium Enrichment Preliminary Discussion of Cob…
Orientational disorder in cubic CsNO2by neutron powder diffraction
Neutron powder diffraction data of cubic CsNO 2 at room temperature (space group Pm 3 m , a = 4.389 Å) are analyzed with several models for the orientationally disordered NO 2 group. The density distribution of O and N atoms are expanded on spherical shells with cubic harmonics. The density of the O atoms is concentra…
Die Bedeutung von Spalten zwischen Rohren und Rohrboden für das betriebliche Verhalten von Wärmeaustauschern
Abstract Importance of crevices formed between tubes and tube plate for the operational behaviour of heat exchangers . It must be guaranteed by construction and manufacture of heat exchangers that primary and secondary medium are completely separated from each other. When this requirement is fullfilled, the operationa…
Effect of Phosphate Film on Wet Adhesion of Paint Film on Zinc-Nickel Alloy Electroplated Steel Sheet
Wet adhesion of paint film on Zn-Ni alloy electroplated steel sheet is significantly affected by the metal ion balance in phosphate solution. Variation of the Ni++ ratio in phosphate solution changes the Ni content of phosphate film formed. As the Ni content of phosphate film increases, the wet adhesion of paint film…
Crystal growth and physical properties ofl-glutamic acid halides,l-c5H9NO4· HX (X = Cl, Br, I)
Single crystals of optical quality of l -glutamic acid chloride, bromide and iodide with dimensions up to 80 × 30 × 20 mm have been grown from aqueous solutions by controlled lowering of temperature from 315 to 300 K. The isotypic crystals possess quite similar physical properties. Strong anisotropic effects are found…
Intramolecular exchange interaction between two rare-earth ions
A theoretical interpretation is made of the magnetic susceptibilities of the dinuclear rare-earth complexes of phthalocyanine [RE2(pc)(dpm)4][where RE = Sm3+–Yb3+ and Y3+, pc = phthalocyaninato(2-) and dpm = 2,2,6,6-tetramethylheptane-3,5-dionato(1-)] measured from 77 to 300 K. The tendencies of the magnetic moments t…
Radial Distribution Function Analysis
Abstract The diffraction pattern of any material contains structural and chemical property information that can be extracted using radial distribution function analysis. This article provides an introduction to the technique and presents several examples highlighting various ways in which it can be used. It begins wit…
13C-nmr Studies of Cedranolides
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT13C-nmr Studies of CedranolidesP. Joseph-Nathan, A. Gutiérrez, J. D. Hernández, L. U. Román, and R. L. SantillanCite this: J. Nat. Prod. 1986, 49, 1, 79–89Publication Date (Print):January 1, 1986Publication History Published online1 July 2004Published inissue 1 January 1986h…
Review of recent irradiation creep results
Materials deform faster under stress in the presence of irradiation by a process known as irradiation creep. This phenomenon is important to reactor design and has been the subject of a large number of experimental and theoretical investigations. This purpose of this work is to review the recent experimental results t…