Materials Literature
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Abstract Complexes of saturated nitriles with metal chlorides polymerize readily. In this paper, the polymerization of acetonitrile was carried out with more nitrile, than was needed to form the complex with metal chlorides. The conversion of the polymer increased in comparison with the case of the polymerization of t…
This paper describes a simple loop plotter, which uses the transverse Kerr effect and is suitable for observation of hysteresis loops for ferromagnetic films of widely varying coercivity and surface finish. Examples are given of its application to a nickel-iron specimen of (i) large area and smooth surface and (ii) sm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization of Massive Amorphous BoronJ. S. Gillespie Jr.Cite this: J. Am. Chem. Soc. 1966, 88, 11, 2423–2425Publication Date (Print):June 1, 1966Publication History Published online1 May 2002Published inissue 1 June 1966https://pubs.acs.org/doi/10.1021/ja00963a011https:…
The luminescences of chromium acetylacetonate and the nitro- and haloderivatives dissolved in three different isomorphous crystalline hosts have been studied as a function of temperature. The lifetimes and relative quantum yields were determined and evidence for two thermally activated nonradiative processes has been…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Kinetic Study of the Formation of the Ferrous-Nitric Oxide ComplexK. Kustin, I. A. Taub, and E. WeinstockCite this: Inorg. Chem. 1966, 5, 6, 1079–1082Publication Date (Print):June 1, 1966Publication History Published online1 May 2002Published inissue 1 June 1966https://pub…
High densities of faulted dislocation loops and stacking-fault tetrahedra have been observed in quenched copper and silver. In copper, the loops are polygonal with edges along <110> directions and vary in size up to 11 500 Å. On annealing, these large loops develop many additional edges along <110> directions. In silv…
Abstract Three series of polyamides having long methylene chain units have been prepared from p ‐xylylenebisethylamine and 2,2′‐ p phenylenebisethylamine with aliphatic dicarboxylic acids of long methylene chain units; aliphatic diamines of long methylene chain units with terephthalic, p ‐benzenediacetic, and p ‐benze…
The absorption spectra of Mn2+, Fe2+, and Co2+ in dihydrated halide crystals have been studied as a function of temperature and with polarized incident radiation. The Mn2+ spectrum is quite adequately explained by considering the combined effects of a tetragonally distorted cubic potential and vibrational and/or spin—…
Abstract Data are presented showing that rapidly quenched polypropylene films contain a paracrystalline phase in addition to crystalline and amorphous phases. The density of the paracrystalline phase was found to vary between 0.8890 and 0.9080 g./cm. 3 . Other data show that the density of quenched polypropylene films…
Abstract Insertion poly(methyl acrylate) and poly(methyl methacrylate) were prepared from monomers adsorbed in monolayers on the surface of montmorillonite clay, both in the presence and in the absence of bifunctional crosslinkers (ethylene glycol dimethacrylate and tetramethylene glycol dimethacrylate). The insertion…
The kinetics of the highly endothermic reactions between carbon and silica were investigated quantitatively for four compressed powder silica-carbon systems and for one charred, silica-reinforced, phenolic resin system. Measurements were made in the temperature range 1300°-1600°C. The reaction kinetics data obtained w…
The transmission characteristics of Fabry-Perot type aluminum-magnesium fluoride-aluminum interference filters for the wavelength region 1700 A to 2400 A are described. Typical peak transmissions of 0.25 with bandpasses <300 A are obtained with first-order filters on fused silica substrates. Secondorder filters give n…
In the ordered MnAl crystal containing magnetic atoms which are coupled ferromagnetically, stacking faults are postulated through which an antiferromagnetic coupling exists between the atoms on either side of the fault. These account for the anomalous magnetic behavior of fine MnAl powder. Such faults give rise to a d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Solution to the Structural Dilemma of Co4(CO)12Based on Valence Tautomerism and Steric NonrigidityF. A. CottonCite this: Inorg. Chem. 1966, 5, 6, 1083–1085Publication Date (Print):June 1, 1966Publication History Published online1 May 2002Published inissue 1 June 1966https:…
It is shown that the well-known Erginsoy's formula for scattering of electrons by neutral impurity is not valid for the electron scattering by neutralized acceptors in germanium or silicon. An alternative formula based on the positron-hydrogen scattering picture is presented and compared with the cyclotron resonance o…
Abstract Observation of optical interference fringes at the tip of a crack in a glassy polymer allows the construction of the configurations of the crack tip and the craze that precedes it. The craze extends 25 μ beyond the crack tip in poly(methyl methacrylate) and 550 μ beyond the tip in the polystyrene studied. The…
A method is presented for calculating the isotropic elastic moduli of ceramic powder from the compressibility and the Debye temperature. Young's and shear moduli of polycrystalline MgO, Al 2 O 3 , BeO, and TiO 2 were computed from compressibility and Debye temperature data by the present method and compared with value…
Crop loss due to soil salinization is an increasing threat to agriculture worldwide. This review provides an overview of cellular and physiological mechanisms in plant responses to salt. We place cellular responses in a time- and tissue-dependent context ...Read More
Two methods used to synthesize high‐purity ferroelectric titanate powders in controlled, narrow size distributions, with average particle diameters <1000 A, were: (1) isothermal pyrolysis of barium titanyl oxalate or mixed calcium‐barium titanyl oxalates as low as 550° and 825°C, respectively, average particle size…
The cell wall of the freshwater diatom Navicula pelliculosa (Bréb.) Hilse is composed of the silica shell and an organic skin which surrounds it. Isolated skins can be prepared by first removing the contents of the cell by mechanical shaking, followed by a posttreatment of these isolated cell walls with HF vapor to re…