Materials Literature
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Diffraction-deformation electron-density (Δp) images for small, naturally faced single crystals of synthetic calcite (CaCO 3 ), magnesite (MgCO 3 ) and mineral rhodochrosite (MnCO 3 ) were measured with focused λ = 0.7 and 0.9 A synchrotron (SR) X-radiation. Mo Kα (λ = 0.71073 A) structure factors were also measured f…
Abstract
The extracting properties of nine new calix[4]arene tetraamides towards the entire alkali cation series and strontium have been determined. One of the amides bearing propargyl (prop-2-ynyl) residues on the nitrogen atoms has also been tested in Complexation in methanol for the same cations. The enthalpies and entropie…
Mathematical modeling of stress generation in casting processes is a difficult, complex subject that is now receiving increased attention. This paper reviews the basic equations, solution methods and important phenomena associated with casting processes that require special numerical treatment. Stress modeling begins…
The effect of the amount of crystallinity on fracture and yielding of polyethylenes as a function of temperature is reviewed. In particular, the effect of fracture toughness, Kc, at low temperatures is investigated. Generally, Kc increased linearly as density decreased. However, it was found that very low-density poly…
The effect of biofilms on crevice corrosion of stainless steels (SS) UNS S31603 (type 316L SS), S31725 (type 317LM SS), N08904 (type 904L SS), and N08367 (6XN) in coastal seawater was investigated using the remote crevice assembly technique. One set of naturally initiated tests and one set of preinitiated tests were p…
A two-dimensional aluminosilicate microporous compound, synthesized from fluoride-containing aqueous media at 170 °C in the presence of 4-amino-2,2,6,6-tetramethylpiperidine as the template, transforms upon calcination above 500 °C into a FER-type zeolite.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Stability of cis-PorphyrinAbhik Ghosh and Jan AlmloefCite this: J. Phys. Chem. 1995, 99, 4, 1073–1075Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 1995https://doi.org/10.1021/j100004a003RIGHTS…
The phase diagram and the scaling behavior of self-avoiding fluid vesicles as a function of the bending rigidity \ensuremath{\kappa} and the pressure increment \ensuremath{\Delta}p is studied using Monte Carlo simulations and scaling arguments. For \ensuremath{\Delta}p>0, a line of first-order transitions is observ…
Human plasma fibronectin (pFN), an adhesive protein, was covalently immobilized onto an alkylaminosilane derivative of a NiTi substrate with glutaraldehyde through Schiff's base formation. The surface at different stages of the modification was characterized by X-ray photoelectron spectroscopy (XPS), and the amount of…
The luminescence of Pb2+ in several calcium borates is reported. The different luminescence spectra can be assigned by considering the oxygen coordination. The energy levels of the asymmetrically coordinated Pb2+ ion do not seem to be influenced by the orientation of the BO3 triangles, since the absorption and Stokes…
The Raman spectrum of graphitic amorphous carbon (g-C) is modeled with simple classical methods, using rings as medium-range structural units. g-C provides a simple [nearly two dimensional (2D) with a single type of atom and one dominant bond type] prototypic example of a large class of continuous random network (CRN)…
The isothermal oxidation of ZrC single crystals with (100) orientation was carried out at temperatures of 500°, 550°, and 600°C at an oxygen pressure of 2.6 kPa for times up to 240 h. A polished cross section of the oxidized crystal was observed by backscattered electron imaging in a scanning electron microscope. Quan…
Simple cyclohexane-1,3,5-triamide derivatives are shown to form linear, rod-shaped structures in the solid state; a triple hydrogen-bonding interaction directs formation of the aggregate and leads to non-centrosysmmetric packing arrangement with modest non-linear optical properties.
ABSTRACT Solutions and mechanical treatments for decolorizing and washing of collagen from plaice ( Pleuronectes plutessa ) skin were studied. The best means was high‐speed homogenization with 0.4M NaCl. Four ways of stabilizing this collagen were tried, involving freezing and freeze‐drying, and partial solubilization…
The relative species composition of diatom flocs formed in the presence of 2 diatom species was studied in a series of laboratory experiments. The aim of this study was to investigate whether species composition in floes reflected initial species composition or whether certain species were enriched in aggregates. In e…
The linear (α) and nonlinear (β, γ) molecular polarizabilities of a series of donor-acceptor \npolyenes containing 3-8 π-bonds are studied using the semiempirical AMl parametrization \nand finite-field (hyper)polarizability computations as a function molecular polarization and \nresulting changes in bond-l…
A review is given of the development of the water-soluble contrast media (CM) with particular attention to the frquency of neurological complications. A remarkable improvement was achieved following the introduction of the nonionic agent metrizamide in 1974, and a further decrease in neurotoxicity was obtained with th…
The Surface Evolver has been used to minimise the surface area of various ordered structures for monodisperse foam. Additional features have enabled its appl ication to foams of arbitrary liquid fraction. Early results for the case of dry foam (negligible liquid fraction) produced a structure having lower surface area…
Abstract Acetylation of native hydrolyzed and oxidized, maize starch has been studied. The different factors affecting acetylation process were investigated. These factors include liquor ratio, acetic anhydride, perchloric acid concentration, reaction time and temperature. Also investigated were characterization and a…