Materials Literature
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Abstract Viscosity and light-transmission measurements of dilute suspensions of montmorillonites having different exchangeable cations were used to calculate relative particle sizes as a function of cation composition, where particle size is expressed as the number of clay plates per tactoid relative to the number of…
ZnO films have been prepared by rf sputtering a Zn target in a planar magnetron system with controlled Ar/O2 gas mixtures. The films were deposited on unheated glass substrates which were either stationary in front of the target or in constant motion. Both the system pressure and plasma impedance changed when an oxide…
Theoretical conformational energy calculations show that large changes in the width of the binding-site cleft in the L-arabinose-binding protein involve only modest changes in the protein internal energy. Solvation energy changes associated with such variations of the cleft width and with protein-ligand interactions a…
Examination of the three‐dimensional structure of periphyton communities through time indicated that their microsuccession is analogous to higher plant succession. The development of attached diatom communities in two reservoirs was studied using artificial substrates, and the morphology of dominant organisms, pattern…
Abstract The adsorption of uncharged polymers by clays is largely “entropy-driven.” Polymer conformation changes from a random coil in solution to an extended form at the surface in which adsorbed polymer segments or trains alternate with loops and tails extending away from the surface. Although the net interaction en…
Lithium-doped p-type CuO is a low mobility semiconductor with an indirect band gap of 1.35 eV and a flatband potential of +0.55 V, with respect to the saturated calomel electrode (SCE), when in contact with an electrolyte at a pH of 9.4. Its valence band lies 5.42 eV below the vacuum level and is made up mainly from t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetailed photocurrent spectroscopy of the semiconducting group VIB transition metal dichalcogenidesK. K. Kam and B. A. ParkinsonCite this: J. Phys. Chem. 1982, 86, 4, 463–467Publication Date (Print):February 1, 1982Publication History Published online1 May 2002Published inis…
A microscopic model for impurity uptake at a sharp crystal-liquid interface during alloy solidification is presented in terms of the bulk properties of the liquid and solid phases. The results for stepwise growth and continuous growth at the same interface velocity differ quantitatively but exhibit the same qualitativ…
The canonical partition function for classical many-body systems is transformed so that the temperature-independent packing statistics and the thermal excitations are uniquely separated. This requires classification of particle configurations according to multidimensional potential-energy minima that can be reached by…
Presents a microscopic theory to calculate the incoherent scattering functions S s (qw) in simple classical liquids. The halfwidth at half maximum omega 1 2/(q), of this function is calculated for liquid argon and rubidium, and the results are compared with corresponding MD results. The observed oscillatory behaviour…
The first complete set of electronic structure calculations are reported for elemental boron in its alpha -rhombohedral (12 atoms per unit cell), beta -rhombohedral (105 atoms) and suggested alpha -tetragonal (50 atoms) crystalline forms. The results show that a band picture provides an accurate description of the bon…
Abstract Temperature dependent characteristics of blends of suspension poly(vinyl chloride) with low and high molecular weight plasticizers in the region of processing temperatures have been investigated. The interaction process has been studied under dynamic conditions using the differential thermal analysis (DTA) me…
Abstract Untersucht wurden die katalytischen Eigenschaften von Metall‐Polyphthalocyaninen mit Fe(II), Co(II), Cu(II), Ni(II) und Mg(II) bei der Zersetzung von Wasserstoffperoxid und ihre elektrochmischen Eigenschaften bei der Reduktion von Sauerstoff. Es ergab sich, daß eine große übereinstimmung zwischen katalytische…
ABSTRACT The utilization of scale inhibitors is the most common and promising method of combatting the scale problems in oil and gas field operations. The extension of the scale inhibition technique to geothermal operations faces some problems mainly due to the high temperature and high salinity of the brines. In addi…
ABSTRACT A new approach for computing calcite scaling tendencies is described. Computed values are obtained by exactly solving the chemical equilibria expressions for calcite precipitation. To date, extremely accurate predictions of calcite scale deposition in oilfield systems have been made based on this computed sca…
Abstract Methyl methacrylate (MMA) was copolymerized with acrylamide, N ‐methylacrylamide, N,N ‐dimethylacrylamide, 1‐vinyl‐2‐pyrrolidone, 4‐vinylpyridine, and 2‐dimethylaminomethyl methacrylate in 1,4‐dioxane solution at 65°C, using AIBN as initiator, to yield copolymers with comonomer contents between about 5 and 50…
The phase diagram of chiral smectic $p$-decyloxybenzilidene-${p}^{\ensuremath{'}}$-amino-2-methylbutyl cinnamate in an external magnetic field parallel to the smectic layers has been determined by dielectric and optical measurements up to 14.5 T. The data indicate the existence of a Lifshitz point between the disorder…
Shear mechanical properties have been measured for free-standing films of the liquid crystal $n$-hexyl 4\ensuremath{'}-$n$-pentyloxybiphenyl-4-carboxylate (65OBC) in its stacked-hexatic $B$ phase. The smectic-$I$ phases of (\ifmmode\pm\else\textpm\fi{})-4-(2\ensuremath{'}-methylbutyl)phenyl 4\ensuremath{'}-$n$-nonylox…
Two iron(III) chloride solutions, prepared in suitable chemical conditions, have been examined by the x-ray diffraction technique. The two solutions are isoelectronic (i.e., they have the same average scattering power per chlorine atom) with the hydrated FeCl3⋅6H2O melt previously examined [J. Chem. Phys. 71, 4255 (19…
The polarized Raman and infrared reflectivity spectra of single crystal LiNaSO4 are reported. Symmetry-based vibrational band assignments are given for both the internal and external optic models. The spectra of 6LiNaSO4 clearly identify higher frequency external modes as originating in lithium ion motion essentially…