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The morphology and orientation of a number of polymers as crystallized from solution was studied with the electron microscope combined with selected area electron diffraction. In the course of this work single crystals could be prepared which were most striking in the case of straight chain polyethylenes. There is evi…
1. Properties of X-rays. 2. Geometry of Crystals. 3. Diffraction I: Directions of Diffracted Beams. 4. Diffraction II: Intensities of Diffracted Beams. 5. Diffraction III: Non-Ideal Samples. 6. Laure Photographs. 7. Powder Photographs. 8. Diffractometer and Spectrometer. 9. Orientation and Quality of Single Crystals.…
Abstract A study of the polymerization of acrylonitrile in NN-dimethylformamide solution at 60°C in the presence of a number of lithium salts, including a determination of the absolute velocity coefficients, has been made. The coefficients for the propagation reaction and the transfer reactions to triethylamine and ca…
Abstract It is supposed that a region within an isotropic elastic solid undergoes a spontaneous change of form which, if the surrounding material were absent, would be some prescribed homogeneous deformation. Because of the presence of the surrounding material stresses will be present both inside and outside the regio…
A method is developed to include polarization effects in low-energy scattering of electrons from atoms, within the Hartree-Fock formalism. This description is different from the usual expansion in terms of the eigenfunctions of the atom. The method associates with each atomic orbital perturbed or polarized parts which…
The elementary theory of secondary electron emission developed by Salow, Bruining, Baroody, and others has been generalized and modified to incorporate recent measurements by Young of the range-energy relation and the dissipation of energy by slow electrons in solids. It is found that these modifications give consider…
Abstract Manganese-rich γ phase alloys of manganese + copper have been investigated by neutron and X-ray diffraction techniques, and the temperature variations of magnetic susceptibility and electrical resistivity have been measured. The disappearance of long-range antiferromagnetic ordering has been correlated with t…
Abstract The efficiency of the oxidative chain scission in natural rubber vulcanizates has been measured for a simple MBTS vulcanizate with and without antioxidants. This was accomplished by making concurrent measurements of the chain scission velocity and oxidation rate. The chain scission velocity was obtained from…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrosion Resistance of Copper and Copper AlloysArthur I. HeimCite this: Ind. Eng. Chem. 1957, 49, 8, 63A–66APublication Date (Print):August 1, 1957Publication History Published online25 May 2012Published inissue 1 August 1957https://pubs.acs.org/doi/10.1021/i650572a754https…
The causes of hysteresis in the adsorption isotherms on porous Vycor glass are discussed, employing as ancillary evidence the dimensional changes of the adsorbent. Diagrams of domain complexions for pores of the ink-bottle type are given and used to develop certain of Everett's theorems. Evidence showing the interdepe…
Abstract Cellulose nitrate was degraded ultrasonically at 0 to 85°C. in the alkyl acetates from methyl to heptyl. In each solvent there is a high and low limit temperature where cavitation and degradation both cease. The upper limits are at the temperatures where vapor pressure of the solvent is about one‐half atmosph…
On acid hydrolysis of cotton, the degree of polymerization (DP) of the insoluble residue falls rapidly to a low level (leveling off DP). Continued hydrolysis results in further losses in weight, but the DP, and the micelle dimensions, remain unchanged. Immergut and Rånby [6] suggest that individual micelles at the lev…
The stable orientation of a 180° ferromagnetic domain wall in a cubic crystal with <100> easy directions is calculated as a function of crystal orientation for a sheet specimen with a <100> direction parallel to the surface. The effect of the second crystal anisotropy constant K2 on the dom…
A m odel was co nstru cted of p entagon al rin gs o f sy mm et ric al tet ra hedra so co nn ected t ha t all fiy e silico ns li e in one plane and all angles Si-O-Si app rox imate 180. From an ini tial tet rahedro n t he rings extend in six direction s to include its six edges and in t he r es ul t in g t hree-dim ens…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation O. L. Anderson, H. Christensen, P. Andreatch; Technique for Connecting Electrical Leads to Semico…
Diffusion in purified natural graphite crystals was studied by two techniques. Crystals with ${\mathrm{C}}^{14}$ atoms on the surface were prepared by heating at 1575\ifmmode^\circ\else\textdegree\fi{}C for thirty minutes in a mixture of radioactive carbon monoxide and helium. These crystals were heated at diffusion t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical Properties of Monolayers Adsorbed at the Solid–Air Interface. I. Friction and Wettability of Aliphatic Polar Compounds and Effect of HalogenationO. Levine and W. A. ZismanCite this: J. Phys. Chem. 1957, 61, 8, 1068–1077Publication Date (Print):August 1, 1957Publicat…
The infrared spectra of NaCl, NaBr, NaI, KCl, KBr, RbCl, CsCl in the gas phase have been measured in the region of the fundamental vibration frequency. The vibrational frequencies calculated from the observed spectra are: NaCl ωe=366 cm−1,NaBr ωe=302 cm−1,NaI ωe=258 cm−1,KCl ωe=281 cm−1,KBr ωe=213 cm−1,RbCl ωe=228 cm−…
Samples of ar~e n i c s ulfid e glaHS " -ere investigated to clc>lerll1ine the ir che m ical a nd phys ical properties. Amon g the proper ties r eported a re t ile hygros co pici t.I', chemi cal durability, hydroge n e lec trod e fUllc t ioll, ex pansivi ty , clastic nlOduli, modulus of rnpture', hardn ess, transmitta…
Large single crystals of Fe 7 Se 8 and Fe 3 Se 4 were prepared, and their magnetic properties below the Curie point were investigated by a torque magneto meter. The results obtained on Fe 7 Se 8 at room temperature show similar characterics to that of natural pyrhotite (Fe 7 S 8 ), i.e. the crystals can be magnetized…