Materials Literature
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Abstract Two types of emulsion‐grade polytetrafluoroethylene particles have been studied. We refer to these as ribbons and rods. The ribbons consist of very thin ribbons or lamellae folded upon themselves a number of times. In typical emulsion‐grade material prepared at Allied Chemical, the unraveled ribbon measures a…
A technique is described for measuring the rate of photobleaching of anisotropic dye molecules in solid polymer matrices. Three dyes of different classes in two matrices (PMMA and epoxy resin) show bleaching rates that differ by a factor of 20. The bleaching rate is linearly proportional to the intensity of incident r…
The crystal structure of the mineral analcime, NaAlSi 2 O 6 · H 2 O, known from x-ray analysis to approximate closely to the cubic space-group symmetry Ia 3 d , has been examined by neutron diffraction. Intensity data from a single crystal were collected for one octant so as to be representative of cubic and some lowe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhthalocyanine derivatives from 1,2,4,5-tetracyanobenzene or pyromellitic dianhydride and metal saltsDavid R. Boston and John C. Bailar Jr.Cite this: Inorg. Chem. 1972, 11, 7, 1578–1583Publication Date (Print):July 1, 1972Publication History Published online1 May 2002Publish…
Any type of irradiation that displaces atoms can produce voids in non-fissile metals and alloys, consequent swelling and mechanical property effects becoming important in fast reactor design and operation. The basic reason for void formation is preferential absorption of interstitials at dislocations. Void growth depe…
Reaction of molecular oxygen as a modulated molecular beam with the basal plane of pyrolytic graphite is investigated. The graphite surface participates in the reaction in an unusual fashion. Oxidation tends to create a highly reactive surface while thermal annealing tends to deactivate the surface. The imbalance of t…
Abstract The two endotherms found during DSC analysis of annealed or drawn poly(ethylene terephthalate), PET, are discussed in greater. detail. Earlier workers proposed that the endotherms were the result of separate morphologies, i.e., extended‐chain and folded‐chain crystals, but more recently Roberts and others hav…
Other| July 01, 1972 The genus Globigerinatheka Broennimann H. M. Bolli H. M. Bolli Search for other works by this author on: GSW Google Scholar Author and Article Information H. M. Bolli Publisher: Cushman Foundation for Foraminiferal Research First Online: 03 Mar 2017 Online ISSN: 1943-264X Print ISSN: 0096-1191 Geo…
Abstract A great number of bands have been observed by light scattering and infrared absorption in Cu 2 O crystals corresponding to transitions most of which are normally forbidden in the perfect crystal. An analysis of the symmetry properties of the lattice modes in the presence of defects is given. In particular the…
Abstract The silver complexes of various thiols of low molecular weight have been studied by amperometric and spectrophotometric titrations. Cysteine and cysteamine form complexes with silver containing up to 1.5 Ag + /—SH. The ligands participating in the binding of silver are the —SH and amino groups. Under some con…
The high‐temperature thermal expansion of monoclinic Nb 2 O 5 was studied with X‐ray and dilatometric techniques. The X‐ray axial thermal expansion was anisotropic; the mean coefficients in the a, b , and c directions, respectively, were 5.3, 0, and 5.9×10 −6 °C ‐1 from room temperature to 1000°C. It is proposed that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopy of some nickel dithiolate complexesSamuel O. Grim, Luis J. Matienzo, and William E. Swartz Jr.Cite this: J. Am. Chem. Soc. 1972, 94, 14, 5116–5117Publication Date (Print):July 1, 1972Publication History Published online1 May 2002Published ini…
Agricultural Research Department, Danish Atomic Energy Commission Research Establishment RisØ, DK-4000 Roskilde, Denmark
The title of these lectures reflects the intent more strongly than the content of them. For while we are particularly interested in how the s-f interaction appears differently in magnetic semiconductors than in metals, in which it has been studied extensively, it seemed necessary after the first lecture on the metals…
Abstract Rotational molding is a process by which powdered or liquid plastics are converted into hollow articles. This paper is devoted to the theoretical understanding of the process of rotational molding. There are seven sections: The Art , wherein we describe the process, discuss previous attempts at understanding…
This paper describes studies of the effects of conducting particles on breakdown phenomena in compressed SF6 under alternating voltage conditions. Results with free particles of different shapes and materials are compared with those obtained with fixed particles for both parallel-plane and coaxial electrode geometrics…
A many-beam dynamical theory, which apporoximately takes into account multiple inelastic scvattering, has been formulated and used to calculate the intensity of electrons backscattered from perfect and imperfect crystals. The contrast of channelling pattern lines is discussed, and the occurrence of ‘missing’ lines is…
A model is proposed to explain the phenomenon of electrode “polarization” in glasses containing alkali oxides. The application of a dc potential to Pt electrodes on an alkali‐containing glass causes a large electric field to develop in the immediate vicinity of the anode. This high‐field region is formed by local diss…
The equations governing the linearized hydrodynamics of cholesteric liquid crystals are systematically deduced. They are valid for compressible as well as incompressible cholesterics and for arbitrary direction of mode propagation. The variables which contribute to the hydrodynamics are the conserved variables, mass d…
A giant pulse of a ruby laser is focused into water, silicone oils, and some other liquids. High-speed photography of the focal region with picture repetition rates up to 850 000 pps shows the dynamics of the produced bubbles. These are extremely well suited to study cavitation bubble dynamics. Spherical almost empty…