Materials Literature
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The sodium titanates Na 4 TiO 4 , α, β‐, and γ‐Na 2 TiO 3 , Na 8 Ti 5 O 14 , Na 2 Ti 3 O 7 , and Na 2 Ti 6 O 13 , all of which can be synthesized in the temperature range 800° to 1200°C, have been characterized by X‐ray diffraction (XRD) and Raman spectroscopy. The existing XRD data have been critically reviewed and s…
The binding of multiple deuterium (D) atoms to vacancies in iron (Fe) is investigated both experimentally, by use of ion-beam techniques, and theoretically, by use of the effective-medium scheme. The experimental D-release stages are accounted for by trapping at vacancies with a binding enthalpy that depends on occupa…
A transmission electron microscopy study has been carried out to understand the structural transformation mechanisms of decomposition of Mg(OH) 2 and MgCO 3 under vacuum. Both Mg(OH) 2 and MgCO 3 decompose topotactically to yield porous pseudomorphic MgO of normal structure with definite orientation relationships. The…
The relationship between all the polyoxotungstophosphates related to PW 12 O 40 3− and P 2 W 21 O 71 6− anions was established. A new compound K 10 P 2 W 20 O 70 was synthesized and characterized by infrared and Raman spectroscopy. These properties, and especially the 31 P and 183 W nuclear magnetic resonance spectra,…
The silica‐scaled algae (Synuraceae, Chrysophyceae sensu lato) are compared to other Chrysophyceae, Phaeophyceae and Bacillariophyceae with occasional comparisons to other chlorophyll c‐containing algae, scaled protozoa and oomycete fungi. The silica‐scaled algae have several unique characters which separate them from…
Analytical expressions for the scattering function for a polydisperse Percus-Yevick fluid with Schulz- (\ensuremath{\Gamma}-) distributed particle diameters have been obtained. Results obtained with the expression for selected width factors and particle densities are presented. Comparisons have been made with approxim…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStarburst dendrimers. III. The importance of branch junction symmetry in the development of topological shell moleculesDonald A. Tomalia, M. Hall, and David M. HedstrandCite this: J. Am. Chem. Soc. 1987, 109, 5, 1601–1603Publication Date (Print):March 1, 1987Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeroxo(tetraphenylporphinato)manganese(III) and chloro(tetraphenylporphinato)manganese(II) anions. Synthesis, crystal structures, and electronic structures.Reuel B. VanAtta, Charles E. Strouse, Louise Karle Hanson, and Joan Selverstone ValentineCite this: J. Am. Chem. Soc. 1…
One of the problems in relation to predicting the rates of defect growth in structures displaying stress corrosion cracking (SCC) is that knowledge relating to realistic stress corrosion crack velocities is very limited. In monotonic slow strain rate tests (SSRTs) taken to total failure at usual strain rates and in te…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBroensted basicity of atomic oxygen on the gold(110) surface: reactions with methanol, acetylene, water, and ethyleneDuane A. Outka and Robert J. MadixCite this: J. Am. Chem. Soc. 1987, 109, 6, 1708–1714Publication Date (Print):March 1, 1987Publication History Published onli…
To ascertain the upper limit of protein thermostability and to evaluate the introduction of additional -S-S- bridges for the enhancement of protein thermostability by site-directed mutagenesis, the stability of cystine residues at 100 degrees C has been investigated in a number of unrelated proteins. All proteins stud…
Polycrystalline specimens of the intermetallic compound Al3Ti with the D022-type structure have been deformed under compression at 25–860°C. At temperatures below 620°C, specimens fracture with very small fracture strain since extremely localized deformation occurs and cracks are initiated in intensely deformed region…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinuclear manganese(III) complexes of potential biological significanceJohn E. Sheats, Roman S. Czernuszewicz, G. Charles Dismukes, Arnold L. Rheingold, Vasili Petrouleas, JoAnne Stubbe, William H. Armstrong, Robert H. Beer, and Stephen J. LippardCite this: J. Am. Chem. Soc.…
The Eu3⊕- and Tb3⊕-cryptates of the ligands 1–3 can function as molecular light converters. The complexes give characteristic 1H-NMR spectra, and the Eu3⊕-cryptate can be electrochemically reversibly reduced (−535 mV vs SCE).
The effect of quenching in the stability of the phases of different commercial clinkers and so its flexotraction and compression strength at 7 and 28 days curing time have been studied. The clinkers were reheated at 1.576 ºC, for a period of thirty minutes, and were quenched in two different ways:-outside at air tempe…
The application of fluorescence light microscopy in the textural study of Portland cement clinker, specially its porosity, is presented. Principles and types of the technique are commented and the suggested sample preparation method is described. The use of fluorescence microscopy allows an easier study of the clinker…
In this work, which is the following of others, the performance of a portland cement of a high initial resistance (P-550-ARI) —with a calculated content (Bogue) of 39,2% of C3S, of 25,7% of C2S, of 9,9% of C3A, of 12,0% of C4AF and of 6,9% of CaSO4 — is studied when it is submitted to the action of deionized water run…
In this work, a Venezuelan-bitumen of newtonian nature was modified by Friedel and Crafts reaction, changing it in new materials that present pseudoplastic characteristics, with very different properties from the original product. These new materials are harder and have less thermical susceptibility and allow us to us…