Materials Literature
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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…
Abstract A melt can readily solidify to a glass with a three‐dimensional or two‐dimensional network, or a chain structure, provided that an irregular bonding system can be formed by virtue of free rotation about the bonds between a central atom and the ligands which function as bridging atoms. Such an irregular struct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkylation of Isobutane with 1-Butene Using Sulfuric Acid as Catalyst at High Rates of AgitationJ. F. Mosby and L. F. AlbrightCite this: Ind. Eng. Chem. Prod. Res. Dev. 1966, 5, 2, 183–190Publication Date (Print):June 1, 1966Publication History Published online1 May 2002Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties and Applications of trans-1,4-PolyisopreneE. G. Kent and F. B. SwinneyCite this: Ind. Eng. Chem. Prod. Res. Dev. 1966, 5, 2, 134–138Publication Date (Print):June 1, 1966Publication History Published online1 May 2002Published inissue 1 June 1966https://pubs.acs.org…
Experimental results are reported on the formation of deformation twins in rhenium single crystals, deformed in tension at room temperature. The twinning shear is large (∼0·6), in agreement with some earlier results for similar twins in zirconium. Low shear twins of the type, which are generally a feature of the defor…
Heterogeneity effect on multilayer composite cylindrical shell stability under axial compression
Abstract Commercial thermoplastics may be classified by the types of rate curves obtained on thermal oxidation. The rate of oxidation of an acrylonitrile‐butadiene‐styrene plastic is affected by sample thickness and appears to be diffusion‐controlled. Pigmentation increases the reaction rate of this compound in all th…
Seeding of supercooled polyethylene melt and solution with extended chain single crystals did not markedly decrease the degree of supercooling necessary to initiate crystal growth.induced with these nuclei.An analysis of the first traces of crystal growth allowed some conclusion about nucleation and growth mechanism.I…
Rods impacting a rigid target at velocities sufficient to produce several percent axial strain are found to buckle plastically with a fairly reproducible wavelength. This phenomenon is investigated for materials which exhibit strain-hardening, a property which is crucial to the theory. The buckling motion is treated a…
Abstract Replicas of fracture surfaces of fractions of linear polyethylene, which were crystallized at elevated temperatures for extended time periods, were examined by electron microscopy. Striated. lamella‐type crystallites were observed for all molecular weights over the range 3.2 × 10 3 −5.7 × 10 5 . In agreement…
Abstract The induction period for the autoxidation of polypropylene increases with increasing sample thickness (from 1 to 75 mils) and with decreasing oxygen pressure. The rate of oxidation shows the opposite dependences. In contrast, neither the rate nor the induction period in well stirred oxidations of squalane is…
The neutron scattering from a single crystal of manganese phosphide has been measured at 4 2 °K. Magnetic scattering was observed in pairs of satellite reflections displaced by ±0.112 c * from the reciprocal lattice points corresponding to nuclear reflections. The positions and intensities of the magnetic reflections…
Parallel electron spin resonance and optical absorption studies of magnesium oxide irradiated to six different doses in the range 1017 to1019 nvt> 1 mev have made possible a detailed correlation of the F-centre with the optical band centred at 2500 Å. Thermal bleaching experiments at 320°c for periods between 5 min an…
A model is proposed to permit the calculation of the remanence in a magnetic tape that is subject to various magnetizing processes. A combination of a regenerative local field and the Preisach diagram is proposed to account for particle interaction. It is shown that, although the Preisach diagram is not stable, its sh…
Hyperfine fields for an Fe atom in intermetallic compounds, Fe 5 Sn 3 and FeSn, have been investigated by using the Mössbauer effect. The hyperfine field of Fe 5 Sn 3 with hexagonal B8 2 -type structure is 187kOe on 2(a) sites while that on 2(d) sites has two values, 247kOe and 208kOe, at liquid-air temperature. The B…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA New Route to Boron NitrideJ. Economy and R. AndersonCite this: Inorg. Chem. 1966, 5, 6, 989–992Publication Date (Print):June 1, 1966Publication History Published online1 May 2002Published inissue 1 June 1966https://pubs.acs.org/doi/10.1021/ic50040a008https://doi.org/10.102…
Abstract The starch–polyacrylonitrile graft copolymer prepared from gelatinized wheat starch with ceric ammoninm nitrate as the initiator has been freed of ungrafted polyacrylonitrile and separated into fractions by extraction with dimethylformamide, γ‐butyrolactone, and dimethyl sulfoxide. The copolymer fractions obt…
Abstract The polymers deposited from the vapors of pentane, ethylene, butadiene, benzene, styrene, and naphthalene subjected to glow discharge have been analyzed by infrared absorption techniques. The reaction products show unsaturation, hydrogenation, and branching in the polymer chains. Aromaticity is present only i…
Many oriented growth phenomena, including the elongation of the Nitella internode, are based upon oriented or textured cell wall structure. In many cases the ordered textures are not present in the earliest stages of cell development but appear later. In Nitella lateral cell (leaf) development the first appearance of…