Materials Literature
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The pillaring of Mg(3)Al layered double hydroxides (LDHs) by the title polyoxometalates (POMs) was accomplished by ion exchange reaction of the LDH-hydroxide and -adipate precursors with the POM anion at ambient or refluxing temperatures. The structural, thermal and textural properties of the LDH-POM intercalates were…
The quantity and chemical nature of carbonaceous impurities remaining on polycrystalline Ag surfaces after preparation depend on the protocol used for cleaning. The effectiveness of several preparation protocols was investigated in this study: mechanical polishing with successively finer grades of alumina, Ar + sputte…
Using recently calculated rate coefficients for reactive coupling of chains at polymer−polymer interfaces, we describe the diffusion-controlled growth of diblock copolymer at the interface between dissimilar molten homopolymer films. The growth exhibits several regimes, successively controlled by (1) the quasilocal re…
A model composed of a synthesis of the nonlinear Cahn−Hilliard and Flory−Huggins theories for spinodal decomposition (SD) and a second-order rate equation for the self-condensation of a trifunctional monomer is presented and used to analyze polymerization-induced phase separation (PIPS). The numerical results replicat…
We describe laboratory experiments on millimeter-sized drops of liquid in air which indicate that both thermocapillary and isothermal shear flows are able to prevent the coalescence of bodies of liquid which would occur readily in the absence of such flows. We have also carried out molecular dynamics computer simulati…
Phosphatidylcholine vesicles provide reaction compartments for synthesis of size-quantized CdS nanocrystals of dimension predicted to within 2.5 Å on the basis of initial encapsulated CdCl 2 concentration and vesicle diameter. Vesicle formation by detergent dialysis of phosphatidylcholine/hexylglucoside mixed micelles…
The melting behavior of three representative semirigid polymers, poly(aryl ether ether ketone), poly(ethylene terephthalate), and poly(ethylene naphthalenate), has been studied. Analysis of experimental results indicates that the melting process is morphologically the reverse of the isothermal crystallization process…
We have studied the conformation of a polymer brush in equilibrium with a solvent that is subject to a shear flow. The interplay between the polymer brush and the hydrodynamic flow of the solvent has been modeled, with simple but largely justifiable approximations. The main technique used in our study is a Monte-Carlo…
Electrooptic poled polymers can be used in a variety of photonic applications involving the switching or modulation of light. These polymers contain second-order nonlinear optical chromophores that have been aligned by electric-field poling near the glass transition temperature of the polymer host. Loss of poling-indu…
A global algorithm for implementing the Gibbs tangent plane stability test in multicomponent, multiphase liquid mixtures is described. The algorithm is self-starting and significantly improves the reliability and robustness of multiphase equilibrium calculations. The main improvement is a result of a new approach for…
The effective pair interaction (potential of the mean force) between large hard spherical colloidal particles in a dispersion containing small hard sphere particles has been studied theoretically. We calculated the effective interaction from the total correlation function by solving the Ornstein−Zernike equation. For…
The surface of poly[ N, N‘ -(oxydiphenylene)pyromellitimide] film, Kapton, was modified by plasma graft polymerization of vinylimidazole to improve the adhesion with copper metal, and the surface of the modified Kapton film was investigated by means of XPS and atomic force microscopy. The plasma graft polymerization d…
Hydration dependent structural changes at the nanometer level were investigated in the natural wood cell of Picea abies. Using the technique of small-angle X-ray scattering (SAXS), it was possible to investigate the same specimens at different degrees of hydration, x, in a nondestructive way, which allowed us to separ…
Nd-Fe-B/Fe/Nd-Fe-B trilayers with individual layer thicknesses between 10 and 100 nm have been grown by sputter deposition. The aim of our study is to investigate remanence enhancement due to exchange coupling between the soft- and hard-magnetic layers as a function of the Fe-interlayer thickness d. It is shown that f…
SERS spectra of pyrazine on silver electrode have been recorded and analyzed, assuming a charge transfer effect and using selection rules analogous to those of resonance Raman. With the aim of predicting the effect of this mechanism on the selective enhancement of fundamentals, a method has been proposed based on an a…
Direct measurement of the depletion interaction between electrically charged surfaces has been obtained using the optical technique of total internal reflection microscopy (TIRM). The long-range interaction between a polystyrene sphere and a polished glass plate was measured in aqueous solutions of non-adsorbing collo…
Oligopeptide amphiphiles with different dipeptide moieties of −XYNH 2 (X = Gly and Ala, Y = Gly, Ala, Val, Leu, and Phe) were synthesized. Binding of aqueous dipeptides onto monolayers of equimolar mixtures of these amphiphiles with a benzoic acid amphiphile (2C 18 BCOOH) was investigated by π− A isotherm measurement,…
The frequencies of Si−O stretching, ν Si - O, in layers of montmorillonite and of H−O−H bending, ν 2, in the interlayer water were investigated by infrared spectroscopy. Oriented gels of Li- and Na-montmorillonite equilibrated at different water contents, m w / m c, were obtained by using a miniature pressure membrane…
In acetone and at subambient temperature, manganese complexes of 1,4,7-trimethyl-1,4,7-triazacyclononane-catalyse the selective oxidation of many alkenes and styrenes to epoxides with an efficient use of H2O2; the regio- and chemo-selectivity resemble those of manganese-porphyrin catalysts.
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