Materials Literature
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A combination of small-angle X-ray scattering and optical microscopy was used to investigate the influence of diluent mobility and polymer−polymer interactions on diluent segregation in a series of “model” melt-miscible poly(ethylene oxide) (PEO) blends. The amorphous polymeric diluents were selected with regard to th…
We report experimental data on the mechanical stability of the silica mesoporous material MCM-41. Using X-ray diffraction and nitrogen adsorption we show that the ordered mesoporous structure of MCM-41 can be affected considerably by mechanical compression at pressures as low as 86 MPa and essentially destroyed at 224…
We report atomistically detailed molecular dynamics simulations of benzene−polystyrene systems (0−84.2 wt % polystyrene). We have calculated solvent diffusion coefficients and have found that their composition dependence not only shows good agreement with experiment but also follows quite well the predictions by latti…
The phase behavior and miscibility of blends of poly(vinylidene fluoride) (PVF 2 ) and poly(1,4-butylene adipate) (PBA), both semicrystalline polymers, have been investigated using differential scanning calorimetry and light-scattering techniques. The phase diagram of this blend system exhibits a single glass transiti…
The synthesis and characterization of various optically active nanoscale-size tetranuclear assemblies held together by coordination bonds is described. Interaction of bis[4-(4‘-pyridyl)phenyl]iodonium triflate and bistriflates of chiral transition metal (Pd(II) or Pt(II)) bisphosphines resulted in the formation of chi…
The growth and planar to cellular and cellular to dendritic transition of crystals in Fe–C alloy melts have been successfully observed “in-situ” by use of a conforcal laser microscope combined with an infrared image furnace. The observations clearly indicated that an increase in the growth rate of planar crystals in a…
Infrared reflectance and Raman spectra of rubidium germanate glasses, x Rb 2 O·(1 − x )GeO 2, have been measured and studied as a function of Rb 2 O mole fraction in the range 0 ≤ x ≤ 0.60. The spectra of corresponding crystalline germanate phases, GeO 2 -quartz, GeO 2 -rutile, Rb 2 Ge 4 O 9, K 4 Ge 9 O 20, K 2 Ge 2 O…
We study the asymptotic limit, as \ 0, of solutions of the Cahn-Hilliard equation 1 under the assumption that the initial energy is bounded independent of . Here / = F', and F is a smooth function taking its global minimum 0 only at u -1. We show that there is a subsequence of {t e }o<e<i converging to a weak solution…
The solubility of paracetamol was studied at 25°C in mixtures of amphiprotic and aprotic solvents of varying polarity (ethyl acetate-ethanol, ethanol-water, dioxane-water). A plot of the solubility mole fraction of the drug versus the solubility parameter of the solvent mixtures reached a peak in dioxane-water, and tw…
The effect of film thickness on the organization kinetics of ultrathin (50−1000 Å thick) spin-cast polymer films was studied using poly(di- n -hexylsilane) and UV absorption spectroscopy. We found an extensive reduction in the crystallinity as well as a reduction in the rate of crystallization for film thicknesses bel…
The synthesis of several amphiphilic squaraine dyes and a study of their aggregation behavior and photophysics are reported. The several different squaraines are found to give spectrally blue-shifted aggregates in aqueous and mixed aqueous-organic solution and in microheterogeneous media (bilayer vesicles). While in s…
The influence of layer charge on the intercalation of terephthalate and benzoate anions in MgAl layered double hydroxides has been studied. It is found that, under the synthesis conditions used here, incorporation of the anion is dependent upon the Mg:Al ratio of the host sheets. Pure terephthalate and benzoate interc…
Introduction: the role of interfacial phenomena in biothecnology - an overview. Modern theory and methods: proteins at interfaces: principles, problems, and potential surfaces in biology and biomaterials - description and characterization physicsof solid surfaces thermodynamics of protein adsorption theoretical models…
The combination of directed mutagenesis with high-resolution structure analysis has made it possible to systematically address fundamental questions of protein folding and stability. Here we briefly review some recent results in this area based on studies of the lysozyme of bacteriophage T4. Extended segments of the p…
Gold colloids are homogeneously coated with silica via a three-step deposition process; the thickness of the silica layer can be completely controlled, and the particles can be transferred into practically any solvent.
An improved preparation of 8-amino-7-quinolinecarbaldehyde has been developed. The methyl group of 7-methyl-8-nitroquinoline may be oxidized to an aldehyde by treatment first with dimethylformamide dimethyl acetal followed by sodium periodate. Reduction with iron provides the amino aldehyde. An analogous sequence affo…
The feasibility of preparing multilayer porphyrin films with monolayer control of composition and thickness is demonstrated. Successive dip-coating of tetraruthenated zinc porphyrin, [ZnTPyPBpy] 4+, and meso -tetraphenylporphyrin sulfonate, [M-TPPS] 4-, is shown to result in linear growth of the film thickness (12.7(6…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCO2 as the Ultimate Degradation Product in the H2O2 Oxidation of 2,4,6-Trichlorophenol Catalyzed by Iron TetrasulfophthalocyanineAlexander Sorokin, Sophie De Suzzoni-Dezard, Didier Poullain, Jean-Pierre Noël, and Bernard MeunierView Author Information Laboratorie de Ch…
The degree of in-plane molecular orientation of various polyimides (PIs) and their precursors, poly(amic acid)s (PAAs), were estimated by measuring the visible dichroic absorption at an incidence angle for a rod-like dye (perylenediimide, PEDI) dispersed in the matrices. The effects of PI chain structure, film thickne…
Software based on nonlinear shell theory can simulate 3D motions related to real fabric-manufacturing processes. This simulation capability advances the technologies necessary for automating the textile and apparel industries.