Materials Literature
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Abstract Four clays were treated with each of eight surfactants at three treatment rates. Volclay and the clay fraction from two montmorillonitic soils were treated with 100, 50, and 10 mmol /100 g.; and kaolinite was treated with 10, 5, and 1 mmol /100g. Adsorption was measured quantitatively by the thermogravimetric…
The permeability to oxygen of 4 wt% lime‐stabilized zirconia and hafnia and of pure thoria was determined between 1100° and 2050°C. The permeability constant (permeability multiplied by the thickness) at 25 torr oxygen pressure is given by: image A 1/4‐power oxygen pressure dependence of the permeability was found for…
Single crystals of γ-LiBO2, which is the phase stable at high (P, T), have been grown at 15 kbar and at 950°C by using a flux technique. The crystals were retained metastably by quenching to room pressure and temperature. γ-LiBO2 is tetragonal with four molecules per unit cell (a=4.1961±0.0004, c=6.5112±0.0007 Å), Spa…
With a new technique of negative staining of sections, it has been possible to observe directly, in ultrathin sections under the electron microscope, the original microcrystalline and microfibrillar structure of cellulose as it occurs in living cells. This method has advantages over the study of isolated fibers used s…
New data on the density of B2O3 from 25° to 230°C are given. A two-state equation of state for the volume is presented which fits the volume data from 350° to 1400°C. A specific structure for the two states is suggested and shown to be consistent with Raman data. Below 350°C and at high pressures the data indicated th…
Self‐diffusion of Zr in 12 and 16 mol.% CaO and of Ca in 16 mol.% CaO cubic zirconia was measured by the sectioning technique from 1700° to 2150°C. Lattice self‐diffusion coefficients are: image Autoradiographs show rapid grain boundary diffusion. D B is estimated as <10 5 D L between 1800° and 2150°C. The low cati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of Hot OH Bonds in the Radiationless Relaxations of Excited Rare Earth Ions in Aqueous SolutionsAdam HellerCite this: J. Am. Chem. Soc. 1966, 88, 9, 2058–2059Publication Date (Print):May 1, 1966Publication History Published online1 May 2002Published inissue 1 May 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMass Spectrometric Characterization of Petroporphyrins1Earl W. BakerCite this: J. Am. Chem. Soc. 1966, 88, 10, 2311–2315Publication Date (Print):May 1, 1966Publication History Published online1 May 2002Published inissue 1 May 1966https://pubs.acs.org/doi/10.1021/ja00962a040h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Structure of the Rhombohedral MO3.3R2O3 Compounds (M = U, W, or Mo) and Their Relation to Ordered R7O12 PhasesS. F. BartramCite this: Inorg. Chem. 1966, 5, 5, 749–754Publication Date (Print):May 1, 1966Publication History Published online1 May 2002Published inissue 1…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
The indices of refraction of ADP, KDP, and deuterated KDP were measured at temperatures between the Curie point and room temperature. The estimated accuracy of the data is ±0.0001. The empirical equation Δn = (n2+an+b)c(298 − T) where n is the index at room temperature, Δn is the change in index, and T is the temperat…
Single-crystal specimens or polycrystalline sinters of cubic NaCl, KCl, KBr, KI, MgO, CaO, NiO, UC, CaF 2 , BaF 2 , UO 2 , and ThO 2 as well as anisotropic TiO 2 , Al 2 O 3 , and U 3 O 8 were bombarded with 40-keV xenon or krypton ions to give integrated ion doses of up to 2 × 10 16 ions/cm 2 . The specimens were exam…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic Structures of Metal PentacyanonitrosylsP. T. Manoharan and Harry B. GrayCite this: Inorg. Chem. 1966, 5, 5, 823–839Publication Date (Print):May 1, 1966Publication History Published online1 May 2002Published inissue 1 May 1966https://pubs.acs.org/doi/10.1021/ic5003…
Abstract Increased time of mixing carbon black-rubber vulcanizates reduces dynamic modulus and dynamic viscosity as well as phase angle at moderate amplitudes of oscillation. Changes in dynamic properties with mixing time are shown to be associated with dispersion of carbon black.
The electrical resistivity, Hall coefficient and thermoelectric power of tungsten-ditelluride WTe 2 have been determined in the temperature range 4.2 to 600° K using single crystal specimens. The Hall coefficient is of n -type in the whole temperature range, while the thermoelectric power is of p -type below 60° K and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA New Hydrogen-Abstracting Reaction with Diethyl AzodicarboxylateFumio Yoneda, Kunio Suzuki, and Yoshihiro NittaCite this: J. Am. Chem. Soc. 1966, 88, 10, 2328–2329Publication Date (Print):May 1, 1966Publication History Published online1 May 2002Published inissue 1 May 1966h…
Abstract Aus Mn, Al und B wurde eine ternäre Phase der Zusammensetzung Mn 2 AlB 2 erhalten. Diese kristallisiert aus geschmolzenem Überschüssigem Aluminium in silberglänzenden Nadeln, zusammen mit den schon bekannten Verbindungen AlB 2 und Al 6 Mn. Mn 2 AlB 2 hat eine rhombisch‐basisflächenzentrierte Elementarzelle mi…
Abstract Glycidol has been shown to be easily polymerized at room temperature in the presence of triethylamine, pyridine, lithium hydroxide, potassium hydroxide, sodium hydroxide, sodium methoxide, sodium amide, and other catalysts. Its reactivity with these catalysts is vastly greater than that of propylene oxide. Ev…
Modes of deformation involved in shearing of plain weave fabrics are analyzed in terms of the mechanical properties of yarn and the geometrical parameters of the fabric. The effective contact lengths at the intersecting points in the fabric are determined from , the initial modulus of shearing. The hysteresis produced…
The infrared lattice spectra from 700 to 50 cm−1 of eight cubic rare earth oxides are reported. It is evident from these data that the crystal structure determines the frequency position, and clearly shows the effect of the lanthanide contraction in this series of compounds.