Materials Literature
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The changes in surface area and mesoporosity in aggregates of ∼0.01 μm cross‐section CaO particles when heated in CO 2 at 686°C were determined from N 2 adsorption isotherms. Initially, the surface area decreases rapidly with little change in porosity. When the surface area has decreased below ∼90 m 2 /g, surface area…
In this paper we describe systematically the forms, symmetries, and selection rules for the normal modes of vibration of a number of examples of surface-adsorbed species. The chosen cases are discussed for adsorption both on isolated sites and in regular arrays of surface sites such as are occupied at higher coverage.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew phases and chemical reactions in solid carbon monoxide under pressureAllen I. Katz, David Schiferl, and Robert L. MillsCite this: J. Phys. Chem. 1984, 88, 15, 3176–3179Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of hydrogen bonding on the properties of iron porphyrin imidazole complexes. An internally hydrogen bonded imidazole ligandRobert Quinn, Janet Mercer-Smith, Judith N. Burstyn, and Joan S. ValentineCite this: J. Am. Chem. Soc. 1984, 106, 15, 4136–4144Publication Dat…
The series treats the mixing on the molecular scale (micromixing) of two miscible streams to bring about reaction between their constituents. The case where mixing and reaction have similar time constants is particularly interesting, although the framework is also valid for slow and instantaneous reactions. The case o…
The 4 × 4 matrix formalisms developed respectively by Berreman [ D. W. Berreman , J. Opt. Soc. Am.62, 502 ( 1972)] and by Yeh [P. Yeh , J. Opt. Soc. Am.69, 742 ( 1979)] for the description of the ellipsometric properties of planar multilayer anisotropic media are compared. Features of both are used to provide a framew…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT[(Me5C5)Rh(cis-Nb2W4O19)]2- isomers: synthesis, structure, and dynamicsC. J. Besecker, V. W. Day, W. G. Klemperer, and M. R. ThompsonCite this: J. Am. Chem. Soc. 1984, 106, 15, 4125–4136Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpontaneous vesiclesJames E. Brady, D. Fennell Evans, B. Kachar, and B. W. NinhamCite this: J. Am. Chem. Soc. 1984, 106, 15, 4279–4280Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Published inissue 1 July 1984https://pubs.acs.org/doi/10.1…
A horizontal layer is heated from below and cooled from above so that the enclosed single-component liquid is frozen in the upper part of the layer. When the imposed temperature difference is such that the Rayleigh number across the liquid is supercritical, there is Bénard convection coupled with the dynamics of the s…
Abstract 2,3‐Dicarboxy cellulose and partially oxidized 2,3‐dicarboxy cellulose were prepared in good yields from the corresponding dialdehyde cellulose obtained by periodate oxidation of cellulose according to a modification of the method described by Hofreiter, Wolff, and Mehltretter [ J. Am. Chem. Soc ., 79 , 6457…
Abstract An overview is given of the mechanism and theories of adhesion of brass-plated steel cords to rubber. The literature on this topic in the period 1979–1983 is reviewed. Although the actual type of bond between the interfacially formed copper sulfide film and the cured network still has not been identified conc…
A critical survey of the laboratory test methods used to measure wicking is presented, and the four main methods are compared through application to a range of knitted fabrics produced from various fiber types. Correlation of the results indicates which combination of methods provides a meaningful assessment of fabric…
Abstract Microstructural features of semicrystalline polymers are reviewed, as are the roles of chain properties and thermal history in their development. Experimental results relating failure properties to microstructural detail are described. General models to explain inter‐ and intra‐spherulitic failure behavior ar…
Richard Zallen 1983 Chichester: John Wiley xi + 304 pp price £30.95 ISBN 0 471 01968 2 As the author points out, solid state physics has traditionally meant crystal physics, where crystal-lattice periodicity assists the formulation of the mathematical descriptions which predict the properties of the solid. In recent y…
The action of basic catalysts such as KH on the ammonolysis products of CH 3 SiHCl 2 , (CH 3 SiHNH) n , results information of polysilazanes of intermediate molecular weight (600 to 1800). Pyrolysis of these polysilazanes gives ceramic materials, which appear to be mixtures of Si 3 N 4 , SiC, and C, in yields of 80 to…
An earlier report [Acta Cryst. (1977), A33, 681-684] by a joint IUCr-IMA committee on the nomenclature of polytypism has been revised and extended. Two kinds of symbolism are recommended for use with either simple or complicated polytypic structures. The first consists of 'indicative symbols' in a modified Gard notati…
Abstract Extremely small colloidal ZnS particles (diameter ∼ 1.7 nm) were made by either photo‐degradation of 3 nm particles or rapid precipitation in phosphate containing solution at pH = 7‐−8. The absorption spectra of these particles are different from that of macrocrystalline ZnS, and the changes are regarded as a…
Abstract Infrared spectra in conjunction with calorimetric measurements have been used to follow the crystallization process and microstructural changes of poly(ethylene oxide) (PEO) in poly(ethylene oxide) and poly(methyl methacrylate) (PMMA) blends. We have given particular attention to compositions containing low P…
The diffractive properties of constant-thickness zone plates composed of arbitrary materials are presently well known. Less well known, however, is the fact that the constant-thickness zone plate is the best possible profile that can be created for maximizing the throughput diffraction efficiency of a zone plate syste…
The cubic Laves phase of YCo 2 is near a transition from a paramagnetic to a magnetically ordered state. Self-consistent energy-band calculations yield the total energy and the magnetic moment as functions of volume. The new fixed spin-moment (FSM) method, which allows one to calculate the total energy as an explicit…