Materials Literature
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During pyrolysis of pure cellulose, the Crystallinity Index (Crl) remained fairly constant over more than 50% weight loss before dropping rapidly as the X-ray pattern deteriorated. With samples first treated with trace quantities of inorganic salts, heating first increased the Crl—the results implying a preferentially…
Densification of MgO with LiF additions depends on the formation of a liquid that is initially a lubricant for rearrangement of particles and later a material transport medium for pressure–enhanced liquid–phase sintering. The rate–controlling process in the latter stage is viscous flow of the liquid through grain–boun…
Abstract Feinteiliger Anatas wurde mit NaF‐Lösungen umgesetzt. Dabei werden OH‐Gruppen der TiO 2 ‐Oberfläche durch F − ersetzt. In ungepufferter Lösung oder bei pH‐Werten am oder wenig über dem isoelektrischen Punkt (pH 6,6) wird nur die Hälfte der vorhandenen OH‐Gruppen. Zugleich tauschen die übrigen, sauren OH‐Grupp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible intramolecular photodimerization of 1,3-bis(.alpha.-naphthyl)propaneEdwin A. Chandross and Carol J. DempsterCite this: J. Am. Chem. Soc. 1970, 92, 3, 703–704Publication Date (Print):February 1, 1970Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer and far-infrared studies of tetrahaloferrate anions of the type FeCl4-nBrn-C. A. Clausen III and Mary L. GoodCite this: Inorg. Chem. 1970, 9, 2, 220–223Publication Date (Print):February 1, 1970Publication History Published online1 May 2002Published inissue 1 Febru…
Abstract The widths at half‐value of high‐resolution NMR spectra of bound water of cellulose were studied in relation to the temperature change. Two points were made clear: First, the amount of bound water of the cellulose sample can be pointed out with higher accuracy the lower the temperature of the measurement. Sec…
Measurements are reported for the thermal conductivity, λ(80° to 400°K), electrical resistivity, ρ(4.2° to 400°K), and absolute Seebeck coefficient, Q(6° to 400°K), of pressed and sintered uranium mononitride. The measurements between 77° and 400°K were made using an absolute longitudinal heat flow apparatus. These da…
Abstract In a study aimed at process optimization of caprolactam polymerization, particular reference has been paid to the competing role of water in caprolactam hydrolysis and endgroup polycondensation. The dependence of the apparent equilibrium constant for polycondensation on water concentration indicated that ther…
Thin films of amorphous (stoichiometric) GeTe have been examined by direct recording of electron diffraction, and intensity profiles across the diffuse diffraction pattern have been recorded with electrostatic rejection of inelastically scattered electrons. Radial distribution analysis of these curves shows that the l…
Abstract Isotactic polypropylene hot‐pressed film was subjected to uniaxial and biaxial stretching. The orientation behavior was investigated by means of x‐ray pole figure technique, birefringence, electron microscope, and tensile tester. From the x‐ray pole figure results it was confirmed that three kinds of crystal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcimer fluorescence and dimer phosphorescence from a naphthalene sandwich pairEdwin A. Chandross and Carol J. DempsterCite this: J. Am. Chem. Soc. 1970, 92, 3, 704–706Publication Date (Print):February 1, 1970Publication History Published online1 May 2002Published inissue 1…
Abstract Differential thermal analysis of mixtures of poly(vinyl chloride) and dioctyl phthalate shows a compound endothermic peak due to decomposition of both polymer and plasticizer. The thermal behavior of other plasticizers is similarly affected in the presence of poly(vinyl chloride). The addition of zinc oxide o…
When uranium metal is nitrified in 1 atm N 2 , the well‐known uranium sesquinitride with the bcc structure is obtained as a single phase at 1150° to 1175°C and below. A single phase of another sesquinitride with the hep structure is formed at 1330° to 1350°C. Between these temperatures, a kinetically stable mixture of…
Fine‐particle beta sodium ferrite (β‐NaFeO 2 ), rather than α‐Fe 2 O 3 , may be responsible for superparamagnetic behavior in a glass of composition (in mole fractions) 0.37Na 2 O‐0.26Fe 2 O 3 ‐0.37SiO 2 . The 700°C isothermal section of the phase diagram of the Na 2 O‐Fe 2 O 3 ‐SiO 2 system is given, showing a three‐…
The effects of capillary grooves on surface wetting and evaporation have been analysed. An attempt has been made to obtain expressions which approximately describe the increase in heat transfer in order to select for given properties and temperature differences a groove of optimum design. For this purpose, it is assum…
Investigations with the electron microscope on γ-irradiated single crystals of LiH have revealed the presence of cubic voids, or bubbles. These bubbles are crystallographically oriented, principally with their sides parallel to the (100) planes of the LiH crystals. Bubbles range in size from ∼ 75 Å to ∼ 1500 Å. Averag…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCyclization reactions of ninhydrin with aromatic amines and ureasRobert Shapiro and Nithiananda ChatterjieCite this: J. Org. Chem. 1970, 35, 2, 447–450Publication Date (Print):February 1, 1970Publication History Published online1 May 2002Published inissue 1 February 1970http…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal conductivity of binary mixtures of alkali nitratesJohn McDonald and Howard Ted DavisCite this: J. Phys. Chem. 1970, 74, 4, 725–730Publication Date (Print):February 1, 1970Publication History Published online1 May 2002Published inissue 1 February 1970https://pubs.acs.…
Contact angles, surface free energies, and work of adhesion were determined by a sessile drop technique for the wetting of MgO, Al 2 O 3 , and SiO 2 by In, Ga, and Sn at 10 ‐10 torr. The surface free energies of In, Ga, and Sn were 540, 632, and 573 ergs/cm 2 (±5%), respectively, at their melting points. Works of adhe…
Abstract Der bei Kaltverformung entstehende Martensit ist bei ebenmäßiger Korrosion nur dann schädlich, wenn sich die Probe im jeweiligen Angriffsmittel im Zustand befindet; die Korrosionsstromdichte steigt dann mit dem Verformungsgrad, Der Verformungsmartensit verringert andererseits die Anfälligkeit für die interkri…