Materials Literature
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Abstract Geometrical probability can be used as a basis for the quantification of XPS‐signals stemming from random samples such as, for instance, supported heterogeneous catalysts. From a study of three ideal cases, namely extended layers of constant thickness, equally sized spheres and hemispheres on a randomly orien…
Static minimization techniques have been used to study diffusion processes down coincident tilt boundaries in NiO. The activation energies calculated for cation vacancy hopping down grain boundaries were found to be significantly lower than the corresponding energy in bulk NiO. Indeed the ratios for the total activati…
We study the growth of dendritic crystals from a supersaturated solution in a channel geometry. This model provides a continuous interpolation between the Saffman-Taylor problem and the (two-dimensional) free-space dendrite. We derive an integral equation for the shape of steady-state propagating fingers, which we tre…
Magnetochemical studies performed on 3d transition metal fluorides and cyanides are reported. The antiferromagnetic and ferrimagnetic behavior observed for various members of the two series of compounds is shown to depend on the geometric and electronic features of the crystal structures and ions. Variation of these f…
Type IV collagen incubated at elevated temperatures in physiologic buffers self-associates (a) via its carboxy-terminal (NC1) domain, (b) via its amino-terminal (7S) domain, and (c) laterally; and it forms a network. When examined with the technique of rotary shadowing, isolated domain NC1 was found to bind along the…
The sequence specificities of a series of cationic metalloporphyrins toward a 139 base pair restriction fragment of pBR-322 DNA have been studied by DNase I footprinting methodology. Analysis using controlled digests and quantitative autoradiography/microdensitometry revealed that the 5- and 6-coordinate complexes of…
SUMMARY We describe a technique for efficient, quantitative, standardless elemental mapping using a high‐angle annular detector in a scanning transmission electron microscope (STEM) to collect elastically scattered electrons. With a single crystal specimen, contrast due to thickness variations, diffraction, and channe…
Abstract This paper is devoted to the study of the reactions taking place in molten bisphenol‐A polycarbonate‐poly(ethylene terephthalate) mixtures. The analysis of the reaction products by infrared, proton and nuclear magnetic resonance spectroscopy, and by thermogravimetric analysis shows that the main reaction is a…
Article Refinement of the crystal structure of tetraphosphorus decaoxide was published on December 1, 1986 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 177, issue 1-4).
The temperature dependence of the Pt L3-edge EXAFS spectra of the platinum clusters encaged in the cavities of the NaY-zeolite were observed by use of synchrotron radiation. A contraction of Pt-Pt bond by 0.07 Å from the distance in the bulk Pt metal is observed, which is likely to be associated with a strong electron…
Abstract This paper discusses recent examples of the progress made in our understanding of some of the basic physical mechanisms involved in the production of thermoluminescence in a selection of common TLD materials. Special emphasis is given to a discussion of the defects responsible for thermoluminescence in LiF, C…
Abstract In most PVC plastisol processing operations, gelation and fusion characteristics of the plastisol are critically important. For example, in chemically foamed plastisols, plastisol fusion temperature and blowing agent decomposition temperature must be carefully coordinated. In rotomolded parts, rates of gelati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleDevelopment of correlations among the spectral, structural, and electrical properties and chemical treatment of Egyptian cotton fabric stripsMorsy M. Abou-Sekkina, Mohamed A. Sakran, and Ahmed A. SaafanCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 4, 676–680Publication Da…
The effects of two commercial chitin synthesis inhibitors, dimilin and polyoxin D, on chitin fiber formation and cell sedimentation for the diatoms Thalassiosira fluviatilis and Cyclotella cryptica (Bacillariophyceae) were investigated. Dimilin treatments for both diatom species were indistinguishable from controls in…
It has been known for some time that electrochemical measurements are nonpredictive in inhibited concentrated hydrochloric acid at high temperatures. Extensive investigations into the weight loss to linear polarization (LP) rate ratio (R) have revealed the latter to be both very sensitive to the chemical nature of the…
Abstract The hydrogenation of benzene and methyl‐benzenes was performed over a nickel catalyst supported on the porous glass prepared from borosilicate glass with an alumina content ranging from 3% to 5%. The micropore size of the porous glass decreased with increasing alumina content. Although the overall reaction ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbonyl nitrosyl clusters. Syntheses and structures of [Fe5C(CO)13(NO)]-, [Fe6C(CO)13(NO)2]2-, and [Fe3(CO)8(NO)(NH)]-Andre Gourdon and Yves JeanninCite this: Organometallics 1986, 5, 12, 2406–2410Publication Date (Print):December 1, 1986Publication History Published online…
Abstract Authigenic chlorites occurring as pore linings in reservoir sandstones have been investigated by XRD and TEM/EDAX. Both methods identified the Ib ( β = 90°) polytype. TEM/EDAX analyses suggest that the chlorites are Al-rich, Mg-chamosites with Fe/(Fe + Mg) > 0·47. Octahedral Al exceeds tetrahedral Al, resu…
Abstract The observed thickness dependence and excitation profiles of the surface‐enhanced resonance Raman scattering (SERRS) from crystal violet (CV) on silver films demonstrated the importance of surface roughness and chemical effects. Using different normalization schemes in studying the excitation profile of SERRS…
ABSTRACT The frustule of Actinocyclus subtilis ( Greg.) Ralfs has been examined in detail with light and electron microscopy. The complex valve structure can only he appreciated fully by means of thin‐sections. The loculate areola is closed to the inside by a basket of organic material, which is supported by a system…