Materials Literature
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The temperature dependence of the dielectric susceptibility and the loss-peak frequency in dipolar materials has been examined using tlie cooperative, many-body, theory proposed earlier. A set of fundamental relationships between the behaviour of the loss-peak frequency and the magnitude of the sueeptibility are deriv…
Abstract Two variables must be considered when calculating exchange free energies (ΔG°ex) for 2:1 clays: (1) anionic field strength, as expressed by equivalent anionic radius (r a ), and (2) interlayer water content, as expressed by interlayer molality. For smectites that are in a state of high hydration, interlayer m…
Abstract Thermal conductivities of six oriented semicrystalline polymers which range from 0.37 to 0.63 in crystallinity and 1 to 5 in draw ratio λ (up to about 15 for two polymers) have been measured between 100 and 340 K. It was found that for increasing λ the conductivity K ∥ (along the draw direction n̂ ) increases…
Abstract Thermally reversible jellies of optically active 12-hydroxyoctadecanoic acid (12HOA) with CCl4 or aromatic solvents form a lyotropic mesophase, which shows enantiomeric circular dichroism (CD) and induced CD due to achiral molecules added to the jellies, indicating that the jellies have a supramolecular helic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe electronic spectrum of tris(2,2'-bipyridine)ruthenium(2+)Franz Felix, James Ferguson, Hans U. Guedel, and Andreas LudiCite this: J. Am. Chem. Soc. 1980, 102, 12, 4096–4102Publication Date (Print):June 1, 1980Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of autoxidation of iron(II) porphyrins. Detection of a peroxo-bridged iron(III) porphyrin dimer and the mechanism of its thermal decomposition to the oxo-bridged iron(III) porphyrin dimerDer-Hang Chin, Gerd N. La Mar, and Alan L. BalchCite this: J. Am. Chem. Soc. 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of "tailed picket fence" porphyrinsJames P. Collman, John I. Brauman, Kenneth M. Doxsee, Thomas R. Halbert, Edward Bunnenberg, Robert E. Linder, Gerd N. LaMar, John Del Gaudio, George Lang, and K. SpartalianCite this: J. Am. Chem. Soc. 1980, 10…
The fine structure of the several layers and regional specializations in the Drosophila melanogaster eggshell has been studied by a combination of shell isolation procedures and ultrastructural techniques (conventional TEM, whole-mount TEM, SEM, HVEM, freeze-fracture electron microscopy utilizing rotary replication, s…
Spectroscopic ellipsometric data from 1.5–5.8 eV has been analyzed to determine the in situ optical response of the interface between Si and its thermally grown oxide. Results for <100>, <110>, and <111> sample orientations show an interface of width consisting of atomically mixed Si and O of average stoichiometry . T…
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PbZrxTi1−xO3 ceramics around the morphotropic phase boundary (MPB) have been prepared under different firing conditions using the usual ceramic techniques. The phases of the compounds have been investigated with X-ray diffraction photographs. It has been found that the MPB is not a narrow and vertically straight bound…
Two systems of ternary transition metal phosphides with the ordered Fe(2)P-type hexagonal structure are reported. They have the general formula MRuP and MOsP, in which M can be Ti, Zr, or Hf. An onset of the superconducting transition temperature as high as 13.0 K is reported for the ZrRuP compound.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of metal-polymer dispersions by plasma techniques. An ESCA investigationDerek ShuttleworthCite this: J. Phys. Chem. 1980, 84, 12, 1629–1634Publication Date (Print):June 1, 1980Publication History Published online1 May 2002Published inissue 1 June 1980https://pubs…
1 Introduction.- 2 Mathematical groundwork.- 2.1 Tensor calculus.- 2.2 List of useful formulas.- 3 Fundamentals of thermodynamics.- 3.1 System. State. State parameters and functions.- 3.2 The laws of thermodynamics.- 3.3 Nonuniform systems.- 4 Thermodynamics of elastic deformations.- 5 Modes of heat transfer.- 5.1 Rad…
Abstract A temperature‐dependent small‐angle x‐ray scattering and electron microscopic study on a sample of low‐density polyethylene affords a determination of the structure changes in a heating and cooling cycle and suggests a new model of partial crystallization and melting. The analysis of SAXS data is based upon s…