Materials Literature
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Abstract A procedure based on loss of weight after selective dissolution analysis (SDA) and washing with (NH 4 ) 2 CO 3 was developed for estimating the noncrystalline material content of soils derived from widely different parent materials. After extracting with 0.2 N ammonium-oxalate or boiling 0.5 N NaOH solutions,…
Abstract Polymorphism in nylon‐12 film, which appears on casting from a phenol‐ethanol solution, has been investigated by x‐ray diffraction and infrared absorption. The casting temperature was varied from 30 to 130°C and the ambient atmospheric pressure from 50 to 760 Torr. Casting at 30°C gives only the α form, while…
Anodic oxides on have been examined using x‐ray photoelectron spectroscopy (ESCA) combined with Ar‐ion etching. The ESCA spectra were analyzed using both analog, and in some cases digital techniques. Results showed the films to be composed of and . The composition at the surface of the films was found to be electrolyt…
1. The periostracum of Mytilus edulis is a highly sclerotized protein structure as demonstrated by its low solubility in 13 M formic acid. 2. The concentration of DOPA in periostracal hydrolysates is not uniformly distributed, but varies directly with protein solubility and logarithmically with the approximate age of…
The 15 N hydrogen profiling technique is used to measure hydrogen concentration profiles in a variety of films including amorphous anodic barrier films grown in different electrolytes, pseudoboehmite, and composite oxide films grown by reaction with boiling water followed by anodic oxidation. Hydrogen profiles of the…
Crystal structures of six metamorphic low cordierites with Fel(Fe + Mg) ranging from 0.07 to 0.42 (atomic) were refined from X-ray data. No evidence of a superstructure was found, confirming that, in chemically intermediate cordierites, Fe and Mg are located o1 a single site. Although T-O distances remain nearly const…
Samples prepared to obtain u.v.‐emitting YAlO 3 : Ce (YAP:Ce) by solid‐state reactions up to 1600°C are never free of visible‐emitting Y 3 Al 5 O 12 : Ce (YAG: Ce). Furthermore, YAG cannot easily be removed from the products. By adding Ba compounds, the YAG content of the product can be minimized, and BaAl 2 O 4 and o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Experimental Study of Single-Component and Binary Adsorption Equilibria by a Chromatographic MethodDouglas M. Ruthven and Ravi KumarCite this: Ind. Eng. Chem. Fundamen. 1980, 19, 1, 27–32Publication Date (Print):February 1, 1980Publication History Published online1 May 20…
Abstract The static dielectric constant ϵ s in Pb 1− x Sn x Te ( x = 0 to 0.4) single crystals is determined from a magnetoplasma reflection measurement between 4.2 and 100 K. At high temperatures ϵ s increases with increasing temperature obeying a Curie law. The Curie constant is practically unchanged for different a…
ESR and Mössbauer effect measurements in the crystallization process of 5Na2O⋅Fe2O3⋅8SiO2 glass were made to elucidate the state of Fe3+ ions in glass. The ESR spectra in the crystallization process showed the disappearance of the g=4.3 line and the narrowing of linewidth of the absorption line centered at g=2.0. The…
Abstract The morphology of linear polyethylene of M w / M n 1.19 crystallized isothermally from the melt has been investigated. Electron microscopy (EM) of stained thin sections gave exceptionally well‐defined images. There were no qualitative differences between Regime I and Regime II crystallization, but the lamella…
Abstract 13 C‐NMR gives sequence information in copolyesters synthesized from ethylene glycol (EG), 1,4‐butane diol (BD), and methyl terephthalate (TP). The EG‐TP‐EG and BD‐TP‐BD blocks are distinguishable from the unsymmetrical diester sequence EG‐TP‐BD. The carbonyl and aromatic quaternary carbons of terephthalate h…
The study of the electronic properties of organic solids is a major new frontier in solid state physics. On the practical side, organic solids provide electronic and optical materials whose properties can be tailored to suit specific applications. They also pose continuing challenges to fundamental concepts because th…
Abstract The residual stresses in injection molded bars of polypropylene have been examined using a stress relaxation method and by the layer removal technique. A positive value for the internal stress parameter was obtained with newly molded specimens and was found to be retained by specimens stored at liquid nitroge…
The crystal structure of a metamorphic biotite from Au Sable Forks, New York (northeast Adirondacks) has been refined to an unweighted R value of 4.2Vo. The Au Sable biotite is a 2M, mica with space group symmetry C2/c. Although the biotite equilibrated near and cooled slowly from Z: 7fi)ot5OoC, octahedral and tetrahe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAspects of artificial photosynthesis. Photosensitized electron transfer and charge separation in cationic surfactant vesiclesPierre P. Infelta, Michael Graetzel, and Janos H. FendlerCite this: J. Am. Chem. Soc. 1980, 102, 5, 1479–1483Publication Date (Print):February 1, 1980…
The mechanism of oxidation of a porous silicon layer (PSL) was studied by examining the oxidation progress, the temperature dependence of the oxidation and the infrared absorption spectra. It is found that the oxidation of PSL is controlled by a surface reaction at both the surface of PSL and the wall of pores in PSL.…
New morphologies, especially “core-shell” and multilayered structures (“onion structure”) have been obtained for polymer blends containing block copolymers. For triblock copolymers Cop A-B-C, having three sequences of different types, in this case, poly(styrene-b-isoprene-b-methyl methacrylate), the conditions are giv…
Purely ferroelastic transitions, i.e., transitions associated with a spontaneous deformation but no spontaneous polarization, appear from recent experimental investigations as a very common type of structural phase transitions. A theoretical analysis is presented for this class of transitions on the basis of Landau's…
The equivalent circuit in the mobility analogy of a magnetostrictive transducer in the presence of eddy currents is derived. This equivalent circuit is used to predict the effect of eddy currents on the efficiency, the electrical impedance, the transmitting responses, and the receiving sensitivity of a magnetostrictiv…