Materials Literature
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CdSe thin films deposited chemically on glass substrates for 4, 8, and 16 h, and subsequently annealed at 400 °C for 1 h, have been studied by a combination of spectroscopic (photoluminescence and Raman scattering) and structure-determining (x-ray diffraction and atomic force microscopy) techniques. Due to a size dist…
In this study the kinetics of oleate and linoleate adsorption at the fluorite surface have been examined, in-situ, by Fourier transform infrared internal reflection spectroscopy. Data obtained in this study show that the adsorption process is not controlled by convective diffusion. Other results from this study indica…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTEnhanced Translational Diffusion of 9,10-Bis(phenylethynyl)anthracene (BPEA) in PolystyreneChia-Ying Wang and M. D. EdigerView Author Information Department of Chemistry, University of WisconsinMadison, 1101 University Avenue, Madison, Wisconsin 53706Cite this: Macromolecules 1…
The reaction of [(c-C 6 H 11 ) 7 Si 7 O 9 (OH) 3 ] ( 1a ) with GaX 3 (X = Cl or I) in the presence of Proton Sponge (C 14 H 18 N 2 ) affords [(c-C 6 H 11 ) 7 Si 7 O 12 GaX] - [C 14 H 18 N 2 ·H] + ( 2a, R = Cl; 2b, R = I). A single-crystal X-ray diffraction study of 2a reveals discrete ions with no significant interact…
Growth mechanisms of nanometer-sized particles prepared by rf sputtering on silica glass layers were examined. Gold and gallium arsenide (GaAs) particles synthesized with varying sputtering times on a SiO2 sputtered layer were subsequently buried in a SiO2 film by sputtering a SiO2 target. Transmission electron micros…
The effect of strain rate, temperature, grain size, and texture on the substructure and mechanical response of high-purity polycrystalline titanium is presented. The compressive stress-strain response of 20 and 240 µm grain size high-purity Ti was found to depend on both the applied strain rate ; 0.001 ≤ dε/dt ≤ 7500…
Using a surface force balance, we have examined the orientation of a nematic liquid crystal (6CB) confined between mica surfaces. By simultaneous measuring of the force and the refractive index profile, we were able to distinguish between planar, planar twisted, and homeotropic orientation of the nematic. When the mic…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTFormation of Attractive π-Redox CyclophanesPhilippe Hascoat, Dominique Lorcy, Albert Robert, Roger Carlier, Andre Tallec, Kamal Boubekeur, and Patrick BatailView Author Information Laboratoire de synthèse et électrosynthèse organiques, UMR 6510, Université de Rennes, Campus de…
A software and some useful tools have been developed for identifying individual x-ray reflectional peaks recorded with an x-ray imaging plate system. These techniques were applied to analyze the crystal structure of uniaxially oriented polymer samples. Characteristic features of the present method may be summarized as…
Kinetics of lamellar microstructure development of poly(aryl ether ether ketone) (PEEK), poly(aryl ether ketone ketone) containing 70% isophthalate moieties (PEKK(30/70)) and their 50/50 blend during isothermal crystallization and subsequent melting have been studied by DSC, transmitted light intensity, and time-resol…
The theory of depletion flocculation in colloid + nonadsorbing polymer mixtures is extended to cover size polydispersity of the polymer. The case of colloid + binary polymer mixture is studied in detail. The main conclusion is that phase separation is enhanced in a colloid + binary polymer mixture when compared with a…
A structural characterization of two series of ferroelectric low molar mass organosiloxanes is described. X-ray and dilatometry studies have been used to determine the impact of variations in mono- or di-mesogen architecture, halogen substitution and siloxane content on the mesophase structure and thermal behaviour. A…
We show that a conventional continuum formulation of the equations and boundary conditions for the spreading of a pure molten material over a cold, solid substrate of its own kind has no meaningful solution for the angle of attack θs of the fusion front at the contact line, which is the quantity that determines contac…
Abstract The “C” family of alloys, the original being Hastelloy® alloy C (1930's) was an innovative optimization of NiCr alloys having good resistance to oxidizing corrosive media and NiMo alloys with superior resistance to reducing corrosive media. This combination resulted in the most versatile corrosion resistant a…
In this paper we report on crystal growth and the electrical characterization of the compounds CuGaTe2, CuInTe2 and their solid solutions CuIn1—xGaxTe2. Single crystals were obtained by zone melting and a vertical Bridgman technique. From resistivity and Hall effect measurements in the temperature range of 35 to 400 K…
Abstract The crystal structure of a natural, ordered IIb-4 triclinic clinochlore has been refined in space group C 1̄ from 4282 unique X-ray intensity measurements of which 3833 are greater than 3 times the statistical counting error (3σ). Unit cell parameters are a = 5.3262(6) Å; b = 9.226(1) Å; c = 14.334(3) Å; α =…
We study the self-organization of a polydisperse A−B multiblock copolymer melt with repulsive interactions between the different monomers. In the framework of the one-loop (Hartree) approximation we consider the influence of the polydispersity parameter u, which is the ratio of the first two moments of the block lengt…
This paper presents the orientational relaxation of nonlinear optical (NLO) chromophore in a linear polyurethane of T-polymer based on 4-[(2-hydroxyethyl)amino]-2-(hydroxymethyl)-4‘-nitroazobenzene (T-AZODIOL) and aromatic diisocyanate of tolylene 2,4-diisocyanate (TDI). T-polymer has the feature that NLO dipole momen…
We propose a theoretical model that successfully describes numerically such major features of the electrical conductivity of the surface of ice as its magnitude and frequency dependence. Comparison of the model with experimental results on σ s confirms that the magnitudes of the ice surface charge density and ice surf…
The microbiological barrier properties of food-packaging paperboards, coated with polyethylene, mineral pigment or a biodegradable polymer and of high-density paper were examined with confocal laser scanning microscopy. The results show that the spatial distribution of microscopically observable bacterial cells was un…