Materials Literature
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Abstract This article presents the experimental and theoretical aspects of small-angle scattering, and discusses specific applications used in the characterization of metals, glasses, polymers, and ceramics. The basic methods of collimating x-rays, the cause of smearing from a line source, desmearing parameters, and t…
Amorphous (noncrystalline) cellulose was prepared by dissolving cotton hydrocellulose in the dimethylsulfoxlde-paraformalde-hyde solvent system and regenerating the cellulose by slow addition of the resultant raethylol cellulose solution to stirred 0.2M sodium alkoxide in methanol :2-propanol (1:1 vol.). The regenerat…
As part of research to develop a highly durable concrete container for radioactive waste disposal in chloride and sulfate bearing granite groundwaters, a variety of cement pastes were studied. A sulfate resisting portland cement was used with various replacement levels of Class F fly ash and pelletized blast furnace s…
The tensile properties of β phase Ti–V, Ti–Mo and Ti–Nb polycrystals with various compositions were investigated at 300 and 77 K, and they were related to plastic deformation modes determined by optical and transmission electron microscopy. The stress-induced ω phase transformation occurs in {332}〈113〉 mechanical twin…
The crystal structures of several icosahedral boron containing compounds have been refined using Mo Kα intensity data. Though these compounds, α‐boron, boron carbide, boron phosphide and boron arsenide, differ chemically, all have the same basic rhombohedral structure. The structures consist of icosahedral units bonde…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAsymmetric synthesis of helical metallocenesAnantha. Sudhakar and Thomas J. KatzCite this: J. Am. Chem. Soc. 1986, 108, 1, 179–181Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Published inissue 1 January 1986https://pubs.acs.org/doi/10…
Abstract The polymerization and characterization of the ether‐containing aromatic polyimides of the following general structure are presented. magnified image The polymerization was conducted in one step in homogeneous solution of m‐cresol at high temperatures. Typical polyeterimides (PEI) were noncrystalline and show…
The short term corrosion behaviour of four as-cast commercial aluminium bronzes has been examined by immersing the materials in artificial sea water for various lengths of time. Optical and scanning electron microscopy showed that the phases which underwent selective attack were: martensitiβ in the aluminium bronze, A…
In this work we present the exact solution for the rate of creeping flame spread over thermally thin materials based on de Ris' (1969) formulation of the problem. The publication of the present work was prompted by a recent paper by Wichman and Williams (1984). These authors noted that de Ris (1969) obtained theoretic…
Liposomes containing ultrafine magnetite were prepared and their transport characteristics in a magnetic field were examined in vitro and in vivo. About 15μg of magnetite (Fe3O4) could be entrapped in the liposomes per μmol of lipid without impairing the liposomal encapsulation capacity for the aqueous marker (3H-inul…
Corrosion of sintered α‐SiC under thin films of Na 2 CO 3 /CO 2 , Na 2 SO 4 /O 2 , and Na 2 SO 4 /SO 3 was investigated at 1000°C. Chemical analysis was used to follow silicate and silica evolution as a function of time. This information couples with morphology observations leads to a detailed corrosion mechanism. In…
A series of covalently linked Zn–H2 porphyrin dimers has been synthesized. The linkage consists of a flexible alkoxy chain of variable length. Absorption spectroscopy shows that there is some exciton coupling between the two porphyrin rings, whilst fluorescence spectroscopy shows that the ZnP unit transfers singlet-st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel photocatalytic process of amine N-alkylation by platinized semiconductor particles suspended in alcoholsBunsho. Ohtani, Haruyoshi. Osaki, Seiichi. Nishimoto, and Tsutomu. KagiyaCite this: J. Am. Chem. Soc. 1986, 108, 2, 308–310Publication Date (Print):January 1, 1986…
Abstract The impact fracture of nominally identical high impact polystyrene resins having different and well‐characterized rubber particle size distributions is discussed. A numerical model for craze termination is presented and its predictions are compared with experimental data. An alternative explanation for the ob…
This text provides an introduction to the fundamental concepts of crystallography, crystalline solids, and the diffraction of X-rays, electrons, and neutrons. The objective of this text is to provide a physical understanding of the subject rather than a rigorous development of crystallography and diffraction theory. A…
The crystal structures of K10[Co4(H2O)2(PW9O34)2]·22H2O (1) and isomorphous K10[Zn4(H2O)2(AsW9O34)2]·23H2O (2) have been determined {Mo-Kα radiation, space group P21/n, Z= 2; (1)a= 15.794(2), b= 21.360(2), c= 12.312(1)Å, β= 91.96°, R= 0.084 for 3 242 observed reflections [I 3σ(I)]; (2)a= 15.842(4), b= 21.327(5), c= 12…
A methodology based upon the concept of fabric unit cell structure and an energy approach has been developed for studying the elastic properties of three-dimensional fabric composites. In general, the unit cell assumes the shape of a parallelepiped with its size determined by the weaving parameters. The yarns can assu…
Polysilicate equilibria in concentrated sodium silicate solutions have been studied using potentiometric (glass electrode) and 29Si n.m.r. methods. Experimental data cover the ranges: 11.36 ⩽ pH ⩽ 14.09, 2.4 ⩽[Na+]tot/mol dm–3⩽ 9.6, 2.1 ⩽[Si]tot/mol dm–3⩽ 9.3 with a variation of SiO2/Na2O between 3.3 and 1.0. From ava…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBrownian dynamics simulation of wormlike chains. Fluorescence depolarization and depolarized light scatteringStuart A. AllisonCite this: Macromolecules 1986, 19, 1, 118–124Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Published inissue…
Abstract Two kinetic models are presented that describe the dissolution of Al, Fe, Mn, and Mg from two forest soils by soluble organic acids. Dissolution of Al, Fe, and Mn occurred as a first‐order kinetic reaction. The rate was in the order Mn ≫ Al> Fe in di‐ and tricarboxylic acids, salicylic, p‐hydroxybenzoic, a…