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Abstract Relations describing sedimentation equilibrium in solutions of self‐associating macromolecules at arbitrary concentration are presented. These relations are obtained by using scaled‐particle theory to calculate the thermodynamic activity of each species present at a given radial distance. The results are expe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAzoalkanes as electron donors in charge-transfer complexes. Molecular structures with sacrificial (.pi.*,.sigma.*) and increvalent (v) electron acceptorsS. C. Blackstock and J. K. KochiCite this: J. Am. Chem. Soc. 1987, 109, 8, 2484–2496Publication Date (Print):April 1, 1987…
The initial high corrosion rates of low-alloy carbon steel in CO2/brine mixtures are mitigated by the subsequent generation of loosely adherent iron carbide surface films, iron carbonate surface films, and, in the case of unbuffered waters, by a significant increase in pH caused by the loss of acid to the corrosion pr…
The breakdown voltage, the upturn voltage, and the nonlinearity of the ZnO varistors are significantly influenced by the Sb 2 O 3 and SiO 2 contents, as well as by the β→γ transition of the Bi 2 O 3 phase. The lattice parameter of spinel is influenced by the coexisting Bi 2 O 3 phase. Antimony oxide disperses into the…
We review the theory of the excitation of electrons from atomic inner shells in crystals as relevant to microanalysis in the transmission electron microscope and suggest several improvements and generalizations. The orthodox theory, originating with Kainuma, represents the fast electrons as Bloch waves and the core an…
A new method to evaluate rotational viscosity η in ferroelectric liquid crystals is proposed. This method is based on the measurement of a polarization switching current upon field reversal. It is shown that a full width at half-maximum of the current peak t w is equal to 1.76η/ P s E , while the area gives twice the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels for met-hemocyanin derivatives: structural and spectroscopic comparisons of analogous phenolate and X (X = OH-, OMe-, N3-, Cl-, OAc-, OBz-) doubly bridged dinuclear copper(II) complexesKenneth D. Karlin, Amjad Farooq, Jon C. Hayes, Brett I. Cohen, Theresa M. Rowe, Ekk…
Research Papers Tribological Advantages of White Layers Produced by Machining B. J. Griffiths, B. J. Griffiths Brunel University, Uxbridge, Middlesex, United Kingdom Search for other works by this author on: This Site PubMed Google Scholar D. C. Furze D. C. Furze Brunel University, Uxbridge, Middlesex, United Kingdom…
High-resolution synchrotron powder X-ray data have been used to solve the structures of I2O4 and Al2Y4O9 by profile decomposition into individual structure amplitudes, followed by application of standard Patterson and direct methods. The data were obtained from a series of spectra recorded with a small linear position…
Abstract Inorganic colloids such as cadmium sulfide are often used as sensitizers and catalysts for photochemical reactions. In these reactions, which are described in terms of the concepts developed in electrode kinetics, electrons are transferred between the particles and molecules in the solution. Extremely small p…
Crack propagation in SiC‐whisker‐reinforced MoSi 2 was studied. In particular, the deflection angles of the cracks were examined to determine the degree to which they are affected by the whisker reinforcement. The composite studied was hot‐pressed MoSi 2 with 20 vol% vapor‐liquid‐solid β‐SiC whiskers. A substantial di…
The nature of a biomaterial surface governs the processes involved in biological response. Surface properties such as surface chemistry, surface energy, and morphology may be measured in order to understand the surface region of a biomaterial. In this article, we describe the surface characteristics of a few common bi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFenestranes and the flattening of tetrahedral carbonBhaskar Rao. Venepalli and William C. AgostaCite this: Chem. Rev. 1987, 87, 2, 399–410Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published inissue 1 April 1987https://pubs.acs.org/do…
A novel synthesis for the covalent linkage of cobalt(II) tetrasulfophthalocyanine (Co^(II)TSP) to the surface of titanium dioxide (TiO_2) particles (d ≤ 0.5 µm) is described. Upon irradiation with light that exceeds the bandgap energy (E_g) of TiO_2 (i.e., ⋋ 5 380 nm), Co^(II)TSP is reduced to Co^ITSP under anoxic con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual orientation of axial ligands in metalloporphyrins. Molecular structure of low-spin bis(2-methylimidazole)(meso-tetraphenylporphinato)iron(III) perchlorateW. Robert Scheidt, John F. Kirner, J. L. Hoard, and Christopher A. ReedCite this: J. Am. Chem. Soc. 1987, 109, 7,…
Abstract The solubility behavior of O‐methyl cellulose (MC) in water was investigated in terms of the distribution of substituents along the cellulose chain as well as in the anhydroglucose (AHG) units. For this purpose, three different types of MC samples were prepared by respective homogeneous reaction, i.e.. (i) me…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin coupling in metalloporphyrin .pi.-cation radicalsBrian S. Erler, William F. Scholz, Young Ja Lee, W. Robert Scheidt, and Christopher A. ReedCite this: J. Am. Chem. Soc. 1987, 109, 9, 2644–2652Publication Date (Print):April 1, 1987Publication History Published online1 Ma…
Ceramics fibers in the system Si-C-N-O prepared by pyrolysis of melt-spun, cured, amorphous organosilicon polymers have a predominantly amorphous chemical structure, consisting of carbon, nitrogen, and oxygen bonds to silicon. These amorphous silicon oxycarbonitrides have chemical bonding approach a random distributio…
The phase diagram of a two-dimensional system consisting of colloids is investigated within the Kosterlitz-Thouless-Halperin-Nelson-Young theory of dislocation-mediated two-dimensional melting. We also present results for the interaction energy, the phonon spectrum, and the longitudinal and transverse sound velocity f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic model for tensile deformation of polymersYves Termonia and Paul SmithCite this: Macromolecules 1987, 20, 4, 835–838Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published inissue 1 April 1987https://pubs.acs.org/doi/10.1021/ma001…