Materials Literature
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Jack C Burfoot and George W Taylor 1979 London: Macmillan viii + 465 pp price £20 The authors have concentrated on ferroelectrics, polar materials which undergo a spontaneous polarisation capable of modification by an electric field. The first and rather larger part of the book is a basic treatment of the electrical,…
Graded-index antireflection (AR) surfaces can be developed on phase-separated optical-quality glass. These surfaces have a median damage threshold of 12 J/cm2 for 1-ns, 1.06-μm laser pulses which is 2.5 times higher than the threshold of thin-film AR coatings, and reflectivity ≲0.2%, comparable to thin-film coatings.
Senescence of isolated petals of Tradescantia is accompanied by a large increase in membrane permeability, and application of ethylene hastens the onset of this increase. There is a 1- to 2.5-hour lag between ethylene application and the onset of anthocyanin efflux (an indicator of increased membrane permeability). Si…
The atomic coordinates and the anisotropic thermal parameters of CsH 2 PO 4 crystal in the paraelectric phase have been obtained using three-dimensional X-ray intensity data collected by a four-circle automatic diffractometer at room temperature. The structure is refined to R =0.029 for 780 independent reflections. Tw…
Oxidation state changes, completeness of oxidation, and densities of anodically formed, electrochromic iridium oxide films have been determined by combined gravimetric, coulometric, and reflection spectroscopy analyses. The results show that the oxidation state of Ir ions in the oxide is changed from III to IV during…
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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