Materials Literature
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Th e co rros ion of singl e crystals of high-puri ty aluminum i n strollg ac id and alkali media is di sclosed as an ordedy process, the rate of attack bein g de pendent on the ori ent ation of the corroding s L Ilface. For a 15-percen t N aOH solution , corrosion a pparent ly prog ressedby r evealin g facet surf3ces…
Oxides having the magnetoplumbite structure and a wide range of magnetic properties have been examined. The magnetic saturations of the compositions MIIFe12O19 can be lowered by replacing part of the iron with the ions Al3+, Ga3+, Mn3+, Cr3+, and Ge3+ amongst others. MII in the above formula can be Ba2+, Sr2+, or Pb2+…
Single-domain particles of 40:60 cobalt-iron alloy have been prepared with a median diameter of 200 angstrom units, a median elongation of 5.4:1, and an intrinsic coercive force of 1950 oersteds. By compacting these particles to various packing densities and degrees of alignment, shape anisotropy fine-particle magnets…
Abstract Polymerization of acrylonitrile in dilute aqueous solution initiated by the chloratesulfite redox was studied kinetically and with the aid of the electron microscope. Polymerization rate depended on the [ClO ] [H 2 SO 3 ] product, the monomer content and the sodium lauryl sulfate concentration. The rate was d…
Furnaces for the growth of naphthalene (m.p. 80 °C.) and anthracene (m.p. 217 °C.) crystals from the melt by the Bridgman method are described and discussed. The advantages of long furnaces are emphasized. A seeding technique may be used to produce long crystals, and has been successful in producing naphthalene crysta…
Th e glass transit ion te mpera t ures, T " of poly-(c hloro t riftuoJ'oethylen e), poly-( vinylid ene ftuorid e), and copolymers prepared from t hese two co monom ers were de termined usin g dilatometric and in terfero metric m et hods. The glass tempera t ure of poly-(chlorotriftuoroethylene) was found to be at 45 C…
Six case histories are given of the use of polyvinylidene chloride film in conjuction with microcrystalline wax to protect underground pipes. It was found that microcrystalline wax of high quality appears to be a superior wetting agent and when wrapped with a protective film of polyvinylidene chloride will thoroughly…
Abstract This paper examines the relationship between the stress-strain properties of highly swollen natural rubber vulcanizates and their equilibrium volume swelling. It is shown that the empirical relationship obtained can be described equally well by either the Flory-Huggins equation or the Flory Modification of th…
Infra-red absorptions now reported for 25 azoaryl derivatives bring the number of N=N- containing structures examined so far up to 83. Indications previously recognized, that the azo-stretching frequencies in azobenzenes lie between 1400 and 1450 cm-1, are confirmed by the present measurements.
Abstract Methods of synthesizing linear polyesters from fluorine‐containing diols have been investigated. The most suitable method consists of reacting the fluorine‐containing diols with dicarboxylic acid chlorides. Number‐average molecular weights in excess of 15,000 have been obtained. The polymers are rubberlike gu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Electron Diffraction Investigation of the Structure of Cuprous Chloride TrimerChi-hsiang Wong and Verner SchomakerCite this: J. Phys. Chem. 1957, 61, 3, 358–360Publication Date (Print):March 1, 1957Publication History Published online1 May 2002Published inissue 1 March 19…
Many ceramic materials can be applied as coatings by flame‐spraying rods made from these materials. Aluminum oxide coatings, stabilized zirconia coatings, and zircon coatings have been studied in detail with regard to their structure and their physical and thermal properties.
Scattering cross sections, scattering coefficients and specific turbidities are calculated from the Mie equations for α = 0.2(0.2)7.0(1)15 and m = 1.05(0.05)1.30; and, in addition, for α = 22(2)32; 39(1)41 and m = 1.05, for α = 16(1)21 and m = 1.10, for α = 7.2(0.2)15.2 and m = 1.20. Thus, the calculations cover virtu…
Possible sources of the anisotropy energy are investigated for ferromagnetic ferrites, i.e., Ni-, Co-, Fe- and Mn-ferrites. The cubic anisotropy energy which arises from the anisotropy of the crystalline field acting on magnetic ions and is described by the function of the spin operator of one ion identically vanishes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry and Spin Resonance Spectroscopy of Radicals from Thioaromatic Compounds1Antonino Fava, P. B. Sogo, and Melvin CalvinCite this: J. Am. Chem. Soc. 1957, 79, 5, 1078–1083Publication Date (Print):March 1, 1957Publication History Published online1 May 2002Published inis…
The activation field of BaTiO3 c-domain crystals may be calculated from an experimental determination of the frequency dependence of the coercivity. The ratio of activation fields above and below the orthorhombic transition is equal to the respective ratio of coercivities. The decrease in coercivity in passing through…
Abstract The mechanism of the conductance of the electric current through a carbon black dispersion is still a problem which has not been completely solved. Rubber is an insulator and forms a homogeneous liquid phase, while carbon black is a semi-conductor and forms a dispersible solid phase. Mixtures of these two sho…
Synopsis Starting from the basis that the direction of sliding of one particle relative to another is, in general, inclined at an angle to the direction of the applied shear stress, a theory is developed to account for the difference between peak and residual stresses in terms of the volume expansion of the mass durin…
Current theories of "single-domain" ferromagnetic particles compare the free energy in a state of uniform magnetization with that in an arbitrarily chosen state of nonuniform magnetization. In this paper, the comparison is made between an initial uniform state and all neighboring states, uniform or nonuniform, as an i…
A study of the effect of Li substitution on the electrical properties of the oxides MnO, CoO, NiO, and CuO has been made. It has been found that (1) the activation energy for conduction increases abruptly near the antiferromagnetic Curie point; (2) as Li is added the activation energy and resistivity initially decreas…