Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic characterization of a new polymorph of metal-free phthalocyanineJames H. Sharp and Marcel LardonCite this: J. Phys. Chem. 1968, 72, 9, 3230–3235Publication Date (Print):September 1, 1968Publication History Published online1 May 2002Published inissue 1 September…
Defect clusters are observed to form in copper and aluminium during examination at ∼20°C in a high voltage electron microscope when the voltage is greater than ∼500 kv and the beam current is high (0·1–0·4 μamps in a 5 μ spot). Experimental and theoretical considerations show that the damage is the result of the direc…
An electron optical scheme has been developed for a low energy electron gun in which the focal properties are independent of final electron energy or beam current over a wide range of these variables. The scheme includes focus-independent provisions for pulsing the beam and regulating the current. Constructional detai…
Hydrothermal synthesis studies in portions of the system CaO—P 2 O 5 –H 2 O—CO 2 –F have produced apatites with composition variations. The lattice constants of the apatites have been determined using computer analyses of x-ray powder diffraction data. By this method compositional fluctuations of a phase within a mixt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative Measurement of Void Content in Glass-Filament-Wound Composites and Correlation of Interlaminar Shear Strength with Void ContentE. J. Kohn, A. G. Sands, and R. C. ClarkCite this: Ind. Eng. Chem. Prod. Res. Dev. 1968, 7, 3, 179–183Publication Date (Print):Septembe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStrong hydrogen bonds. IV. The B2H7- speciesWilbur G. Evans, Clive E. Holloway, Kamthorn Sukumarabandhu, and Darl H. McDanielCite this: Inorg. Chem. 1968, 7, 9, 1746–1748Publication Date (Print):September 1, 1968Publication History Published online1 May 2002Published inissue…
Serpierite, Ca(Cu, Zn)4(on)6(SO4)2.3H20, crystallizes in the monoclinic system, space group C2/c, with a=22.186, b= 6.250, c=21.853 A, B= 113.36° and Z=8. The analysis of the crystal structure was carried out by the interpretation of the Patterson function and by three-dimensional Fourier syntheses and refined by the…
The properties of many sulfide and selenide glasses correspond closely to related oxide systems; this correspondence can be correlated with the ratios of the valences and of the radii of the anions and cations. The analogy of chalcogenides to oxides in phase separation behavior is striking. Systematic substitutions pr…
Abstract Kaolinite, illite, chlorite, montmorillonite, and vermiculite are among the most important of the clay minerals. Cations are embedded between the silicate layers and on the basal faces of the crystals. Whereas only the cations on the outer faces are exchangeable in the first three of the above minerals, those…
The crystal structure of ferberite has been determined and refined by projections to R values of 7.2% for hk 0 reflections and 5.4% for h 0 l reflections. The structure is based on W and Fe octahedra forming infinite zig-zag chains in the direction of the c axis. Each chain contains just one type of cation and each oc…
A preliminary physical and chemical examination of a selected group of spider silks was made. The program's ultimate goal was the synthesis of 'super tenacity' protein fibers, and the work reported here was designed to: confirm the existence of very strong, natural protein fibers, specifically, spider silks; determine…
An analysis has been made of the geometrically similar tests of bias extension and sim ple shear for plain-woven fabrics. This analysis makes possible calculation of the values of the equivalent shear strain and equivalent shear stress, corresponding to measured values of tensile strain and tensile stress in bias exte…
Abstract The character and magnitude of traveling discontinuities in one-dimensional coupled transient thermoelastic problems are studied. For this purpose, 16 different fundamental problems are considered in detail, by examination of the nature of the solutions in the Laplace-transform domain. These problems correspo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEstimation of the critical surface tension for polymers from molecular constitution by a modified Hildebrand-Scott equationSouheng WuCite this: J. Phys. Chem. 1968, 72, 9, 3332–3334Publication Date (Print):September 1, 1968Publication History Published online1 May 2002Publis…
Abstract A comparative study of the reactivity of hydroxide and various alkoxide anions was made by determining percentage weight loss of poly(ethylene terephthalate) fiber. Regardless of the basicity of the anions, the order of reactivity was found to be hydroxide < tert ‐butoxide < sec ‐propoxide < methoxid…
During the last stage of sintering of ZnO, a decrease in bulk density is accompanied by an increase in pore size and a decrease in the number of pores. Examination of the microstructures indicated that the pores are almost always situated at the grain boundaries and at the corners. The dominant pore size increases wit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid crystals. II. Effects of terminal group substitution on the mesomorphic behavior of some benzylideneanilinesJoseph A. Castellano, Joel E. Goldmacher, Lucian A. Barton, and Jean S. KaneCite this: J. Org. Chem. 1968, 33, 9, 3501–3504Publication Date (Print):September 1,…
Abstract This paper reports on three investigations into the toxic potential of plastics, resins and addivtives, with emphasis on those having medical, dental, or pharmaceutical application. The following points were noted: (1) two different lots of PVC resin contained toxic material which was leachable into a biologi…
Parawollastonite crystallizes in space group P 2 1 / a with following cell dimensions: a = 15.426 Å, b = 7.320 Å, c = 7.066 Å, and β = 95°24′15″. M amedov and B elov 's coordinates for wollastonite, as referred to a doubled monoclinic cell, were used to compute a preliminary set of structure factors for parawollastoni…
Diffusion of the radioactive tracer 22 Na in a commercial SiO 2 glass was investigated from 170° to 1000°C. The temperature dependence curve had discontinuities at about 573° and 250°C. The resulting Arrhenius equations are D = 3.44 × 10 2 exp(‐21.1 kcal/RT) cm 2 /sec between 1000° and 573°C, D = 0.398 exp(‐25.8 kcal/…