Materials Literature
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The ferroelectric phase of K${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ and the antiferroelectric phase of N${\mathrm{H}}_{4}$${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ vanish at hydrostatic pressures >17 and 33 kbar, respectively. The results are qualitatively discussed in terms of the coupled proton-lattice model developed…
9, 10-Anthraquiuone (AQ) in an inert aliphatic solvent emits luminescence at room temperature. The emission consists of (1) solution phosphorescence and (2) delayed thermal fluorescence (DTF). We found that similar emission is observed for some AQ and naphthoquinone (NQ) derivatives. The singlet–triplet separation, Δ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPore-size distributions of copper oxide-alumina catalystsKen. Nobe, Muchlas. Hamidy, and Chieh. ChuCite this: J. Chem. Eng. Data 1971, 16, 3, 327–331Publication Date (Print):July 1, 1971Publication History Published online1 May 2002Published inissue 1 July 1971https://pubs.a…
Abstract A white clay from the Jatoba talc mine, Castro, Paraná, Brazil, is shown by chemical analysis, X-ray and electron diffraction, and by thermal analysis to be essentially pure antigorite in the strict sense of the term. Single crystal electron diffraction patterns give various values for the long a parameter, w…
An X‐ray determinative curve has been produced for the rapid analysis of simple silver halides. Complete analyses of thirty‐two specimens of silver halides and examination of approximately fifty more by X‐ray diffraction show that they are, with very few exceptions, embolites with only a few percent of silver iodide p…
Infrared spectroscopic investigations have shown that on the basis of changes in the ν 3 , SO 4 band which occur when calcium sulphate is heated from 400° to 1400 °C, there are two forms of insoluble anhydrite, designated as β′- and β-CaSO 4 . β′-CaSO 4 is metastable and is completely converted into β-CaSO 4 by heatin…
The effect of surface discharges on the ability of polluted insulators to withstand lightning and switching surges has long been a matter of conjecture. This paper describes combined power frequency and impulse voltage tests on 66 kV and 132 kV insulator strings. The tests have shown that an appreciable lowering of bo…
This study was undertaken to measure quantitatively the effect of temperature on the oxygen index values of several fabric samples of cotton, polyester, and their blends. The smoke density generated during the burning of these fabric samples at their oxygen indices was also studied at various temperature conditions. T…
Abstract The kinetics of uncatalyzed autoxidations for polyolefin films, such as atactic and isotactic polypropylene and poly‐(butene‐1) are reviewed in light of recent work. Reaction temperatures generally varied from 100 to 150°C and oxygen concentrations from 5 to 100% by volume. A general reaction scheme is sugges…
The 1H, 2D, 35Cl, and 133Cs NMR of CsMnCl2·2H2O single crystals have been studied. The proton positions could be determined from the observed shift and dipolar splitting and the deuteron positions from the nuclear quadrupole interaction. Conclusions about the hydrogen bonding network were drawn. The rate of the H2O an…
Abstract : Generally, filiform corrosion occurs on aluminum when it is coated with an organic coating and the system is exposed to relatively high humidities. This type of corrosion is initiated or activated by the presence of electrolytes, particularly chloride, and it is fostered by exposures to warm, humid environm…
Dechant's method for determining the total accessibility of cellulose by exchange with deuterium oxide was modified for routine use with cotton fibers. Deuterated cotton was allowed to re-exchange with water or aqueous sodium hydroxide solution and the deuterium oxide content of the liquid used for re-exchange was det…
The classical theory for mass defects in crystals is inapplicable to quantum crystals, where zero-point motion leads to a force-constant renormalization on the introduction of mass defects. We develop a variational theory for handling such problems which simplifies the renormalization so that the problem reduces to th…
Abstract The glass transition temperature T g of partially sulfonated polystyrene has been measured dilatometrically as a function of degree of sulfonation. A semitheoretical relationship between T g and degree of sulfonation has been derived by treating the strong‐acid polymer as a highly polar copolymer of styrene a…
Abstract The emission spectra of several fragmental species, especially of hydrogen atoms, produced by the electron impact (energy:240 eV) of gaseous methanol and deuteromethanols have been investigated. The intensity ratios of the Balmer-β lines of the H and D atoms are ca. 2.9:1 for CH3OD and ca. 1:1.8 for CD3OH, in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleElectron Microscopy of Poly(vinyl chlorides) and Ethylene-Vinyl Acetate Rubber SystemsY. Jyo, C. Nozaki, and M. MatsuoCite this: Macromolecules 1971, 4, 4, 517–518Publication Date (Print):July 1, 1971Publication History Published online1 May 2002Published inissue 1 July 1971http…
Growth of anodic oxide on Al has been studied for porous and nonporous films using the galvanostatic technique. Measurements have been made in 0.1M solutions of H3PO4, Na2HPO4, Na3PO4, and Na2CO3. The high field approximation holds for all results. Evidence is given in support of the Verwey model. The parameters of ox…
The application of explosion-bonded aluminum-to-steel welding transition joints on marine vessels is discussed. Evaluation of this material's suitability for joining aluminum superstructures to steel decks is reviewed in detail. Galvanic corrosion is demonstrated to be negligible, thereby providing significant savings…
Within 5 to 10 min at 37 C, bacteria infected by bacteriophage phiX174 acquire the ability to exclude superinfecting phiX particles from reproducing themselves. The superinfecting phage are blocked at a stage prior to synthesis of the parental replicative form molecule; the superinfecting deoxyribonucleic acid remains…
Abstract The slip line pattern of molybdenum single crystals deformed in tension at temperatures between 293 and 573 °K ( T / T m = 0.1 to 0.2) was systematically investigated using optical and electron microscopy. The transition from parabolic stress‐strain behaviour to three‐stage hardening which occurs in a transit…