Materials Literature
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Abstract Deca-dodecasil 3R, 120 SiO 2 · 6M 10 · 9M 12 · 6M 19 with M 12 = N 2 and M 19 = C 10 NH 17 (1-aminoadamantane), crystallizes in space group R [unk] m with a = 13.860(3) Å and c = 40.891(8) Å. Its crystal structure is built by corner-sharing [SiO 4 ] tetrahedra. The tetrahedra are connected to pseudohexagonal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical generation of an iron(IV) porphyrinJohn T. Groves and John A. GilbertCite this: Inorg. Chem. 1986, 25, 2, 123–125Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Published inissue 1 January 1986https://pubs.acs.org/doi/10.…
Aqueous solutions containing sodium phosphate and sodium molybdate ([P]= 0.01–0.07 mol l–1[Mo] : [P]= 1.25–15) were acidified with concentrated HCl and the formation of molybdophosphate anions was followed by 31P n.m.r. spectroscopy with a view to establishing this technique as an easily applicable method for the iden…
High strength low alloy (HSLA) steels, both commercially available and experimentally prepared, were immersed at 45 and 90 m depths in the North Sea for periods ranging from 1·6 to 7·2 years. General corrosion, pitting corrosion, and crevice corrosion behaviour were evaluated after immersion. The influence of alloying…
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…