Materials Literature
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The surface structure of a model system was measured in real space by atomic force and optical microscopies, and compared with that obtained from measurements in reciprocal space by x-ray reflectivity and off-specular scattering at grazing incidence. Experiments were performed on films of symmetric diblock copolymers…
Abstract The results of the Rietveld analysis of X-ray powder diffraction data for title compounds show that the space group for (CH3NH3)3Bi2Cl9 is Pnma with Z = 4 and its lattice constants are a = 2040.6, b = 770.0, c = 1324.6 pm. It consists of one–dimensional double chains of Bi2Cl93− polyanions. The space group fo…
The formation of ferroelectric domains in the smectic C* (SmC*) phase of ferroelectric liquid crystals with considerable high spontaneous polarization is observed using electrooptical methods. The temperature dependence of the corresponding domain modes DB (bulk) and DS (surface) is studied by dielectric spectroscopy.…
The emission spectra of [Pt(L)(CN)2] (L = 4,7-diphenyl-1,-10-phenanthrollne or 4,4′-di-tert-butyl-2,2′-blpyrldlne) Immobilized in silicone rubber are concentration dependent. At low concentrations of platinum complex a single emission peak is observed. Oxygen quenching of the emission is shown to be a sensitive method…
The dependence of some optical and physicochemical properties of evaporated GexAs40-xS60 films and their photoinduced changes on the average coordination number Z has been investigated. Arguments for a structural phase transition in thin films are given. In the Z dependences of the optical bandgap, refractive index an…
Steady-state quadrupole shape oscillations of air bubbles trapped in water were excited by amplitude modulation of the acoustic radiation pressure used for levitation. This method of exciting controlled shape oscillations may make possible noncontact dynamical measurements of the rheological properties of bubbles. Bub…
The resistivity of single-layered thin copper films with thickness of 17-124 nm, is studied as a function of the temperature and grain diameter. The resistivity of both as-deposited and 500 K annealed films is found to increase with decreasing film thickness. Analysis has shown that the grain-boundary scattering is th…
The total energies and magnetic properties of ideally ordered bcc Fe-Cr compounds and random substitutional disordered bcc ${\mathrm{Fe}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Cr}}_{\mathit{x}}$ alloys are calculated using spin-polarized, self-consistent linear-muffin-tin-orbital-based methods. Calculated tot…
Abstract Two methylated bis(ethylenedithio)tetrathiafulvalene (ET) derivatives, Me2ET and Me4ET were stereoselectively synthesized to examine the effect of methylation on conformations of dihydrodithiin rings and molecular arrangements in the crystalline state. Since the donating ability of Me2ET and Me4ET are similar…
The ability to pattern ion‐implantation damaged or other nondiamond carbon on a diamond substrate is useful for fabricating a variety of devices. We accomplished such patterning by an unmasked implantation into a diamond substrate followed by photolithography and a selective electrochemical etch. The use of a high res…
Abstract The polymerization of L,L‐lactide was conducted in bulk at 120, 150 and 180°C. Hematin ( 1a ), hemin ( 1b ), 5,10,15,20‐tetraphenylporphiniron(III) chloride, 2,3,7,8,12,13,17,18‐octaethyl‐21 H , 23 H ‐porphiniron(III) chloride ( 3 ) and chlorophyllin ( 4a ) were used as initiators. Moderate yields and moderat…
A numeric integration of the spinodal decomposition process in an off-critical mixture of binary polymer blends is carried out to late times. The thermal fluctuation term in the evolution equation is found to be essential to avoid ‘‘freezing’’ of domain growth for such systems, an effect not present in small molecule…
A commercial sintered silicon nitride has been crept in bending and compression at temperatures of 1100°C to 1400°C. In the as‐sintered condition the material contains an amorphous intergranular phase. This phase undergoes partial devitrification as a result of high temperature exposure. Preannealing the material to a…
The antiferroelectric smectic-${\mathit{C}}^{\mathrm{*}}$ (Sm-${\mathit{C}}^{\mathrm{*}}$) phases of two closely related chiral compounds have been studied with high-resolution calorimetric techniques. Both methylheptyloxycarbonylphenyl octyloxybiphenyl carboxylate (MHPOBC) and its octylcarbonylbiphenyl analog (MHPOCB…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSensitivities of droplet size and stability in monomeric emulsionsKevin Fontenot and F. Joseph SchorkCite this: Ind. Eng. Chem. Res. 1993, 32, 2, 373–385Publication Date (Print):February 1, 1993Publication History Published online1 May 2002Published inissue 1 February 1993ht…
With magnesium present, fluoride and aluminum ions activate heterotrimeric G-proteins by forming AlFx complexes that mimic the gamma phosphate of a GTP. We report compelling evidence for a newly proposed process of G-protein activation by fluoride and magnesium, without Al3+. With millimolar Mg2+ and F-, Gs and Gt act…
The way to polymeric copper phosphides is probably marked by multinuclear Cu clusters accessible from copper chloride and functionalized phosphanes. One of the multitude of new compounds with unusual structures prepared from these starting materials is [Cu12(PPh)6(PPh3)6], whose central CuP framework is shown here.
The driving force for surface reconstruction is shown to be given by the (usually nonzero) difference between the surface energy and stress, leading to a ground state characterized by an isotropic stress tensor with vanishing shear components. The analytic results, illustrated by atomistic simulations of the missing r…
Small amplitude oscillatory shear has been used to study thermotropic liquid-crystalline polymers that have mesogenic groups pendant to flexible backbones. The polymers studied form nematic and smectic glasses, enabling viscoelastic response to be studied over a wide range of frequencies using time-temperature superpo…
Brownian dynamics simulations were used to study the adhesion of hard spheres on a solid surface by taking the hydrodynamic interactions into account. Special attention was paid to analyze the configuration of the assembly of adsorbed particles. These results were compared to configurations generated by the extensivel…