Materials Literature
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The PZT polarization hysteresis characteristics in a Pt/PZT/Pt ferroelectric capacitor are degraded by annealing in a hydrogen-containing atmosphere due to the catalytic effect of the top Pt electrode. This can be avoided by using an IrO 2 /PZT/Pt capacitor structure as we proposed. During hydrogen annealing of the as…
Raman spectra and electrical conductivity of thin films of hydrogenated silicon with mixed amorphous-nanocrystalline phase composition have been studied. It is shown that interpretation of experimental data in terms of percolation theory permits one to determine the integrated Raman-scattering cross-section ratio of t…
A method was developed to prepare silver-doped sol–gel films for surface-enhanced Raman scattering (SERS) detection. The technique involves first doping silver ions as a silver ammine complex [Ag(NH3)2+] into a sol–gel matrix, followed by chemical reduction of the doped silver ions into the corresponding silver metal…
A series of Ga-substituted hydrotalcite-like compounds, [Mg 1 - x Ga x (OH) 2 ] (CO 3 ) x /2 · m H 2 O (where 0.07 ≤ x ≤ 0.36; GaHTs), were obtained in order to characterize their structural and crystal properties by means of X-ray diffraction and conventional/high-resolution electron microscopy. A linear relationship…
The optimized preparations and detailed spectroscopic characterization (solution and magic angle spinning nmr, infrared, FT-Raman, powder XRD, mass spectrometry) of the octasilsesquioxane cage compounds X 8 Si 8 0i2 (X = H, CH=CH 2 , OSiMe 2 H, and OSiMe2Br) and the ionic compound {NMe 4 } 8 {Si 8 02o}.60H 2 0 are des…
Abstract Durch basischen Aufschluß von Ta 2 O 5 mit p. a. KOH erhält man durchsichtige Einkristalle der Zusammensetzung K 8 Ta 6 O 19 · 16H 2 O. Der Einsatz von technischer KOH dagegen führt beim gleichem Synthese‐Verfahren zu Einkristallen der Zusammensetzung K 7 NaTa 6 O 19 · 14H 2 O, einer Verbindung, die in der Li…
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…