Materials Literature
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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.
Subtilisin Carlsberg dissolved in aqueous solution is several orders of magnitude more active than the enzyme suspended in anhydrous acetonitrile. In order to ascertain why, we employed crystalline subtilisin lightly cross-linked with glutaraldehyde as a catalyst in both aqueous and organic media. The structure of thi…
Surface macromolecular architectures with regional dimensional precision, control of the thickness of a graft layer, and blocks of graft chains were attempted using the surface photo-graft copolymerization method pioneered by Otsu et al. This is based on the photochemistry of benzyl N, N -diethyldithiocarbamate, which…
This paper describes the synthesis and characterization of self-assembled second-order nonlinear optical multilayer materials containing the high-hyperpolarizability [(aminophenyl)azo]pyridinium chromophore. The chromophoric multilayers are assembled on clean glass or single-crystal silicon substrates via the followin…
The surface structure of mesoporous silica crystals FSM-16 with a narrowly distributed pore size has been studied by FTIR, measurement of SiOH number and adsorption of N2 and H2O. IR spectra of FSM-16 outgassed at temperatures above 170 °C showed a sharp band at 3740 cm–1 due to free SiOH and a broad shoulder at 3600–…
Azobenzene monolayers on silicon have been prepared by two synthetic methods: (1) chemisorption of triethoxysilanes, and (2) acylation of amine-functionalized self-assembled monolayers with acid chloride derivatives. A series of films were prepared with different methylene spacer lengths and different terminal end gro…