Materials Literature
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A new heterogeneous catalyst based on a chemically modified mesoporous silica gel possessing immobilised cobalt ions is developed and successfully applied to the epoxidation of alkenes.
The study deals with the heterogeneously catalyzed gas-phase hydrogenation of cis, trans, trans -1,5,9-cyclododecatriene on coated catalysts prepared by anodic oxidation of aluminum and a liquid-phase impregnation technique. The coat of the catalyst consists of alumina having a regular pore system and palladium as a c…
Protective effect of poly(ethylene glycol) and some other polymers on liposomes is considered in terms of statistical behavior of macromolecules in solution. According to the mechanism proposed, liposome-grafted chains of flexible and hydrophilic polymers form dense “conformational clouds” preventing other macromolecu…
Dianionic and neutral nickel complexes of substituted TTF dithiolate ligands have been prepared showing room-temperature conductivity of up to 10–1 S cm–1 for the neutral complexes; the crystal structure of the neutral complex [Ni(C10H10S8)2] is reported.
The ring-opening polymerization of mixtures of 2,2-dimethyltrimethylene carbonate (DTC) and l, l -lactide (LLA) in the melt, with diethyl zinc or dibutyltin dimethoxide as initiator, results in the formation of random copolymers. LLA polymerizes first in a fast reaction, followed by a slow polymerization of DTC. Inves…
Depolarized light scattering spectra of liquid salol that have been analyzed in recent studies of the liquid-glass transition are reexamined in order to determine the relative importance of orientational fluctuations and interaction-induced scattering. First, the spectra of ${\mathrm{CCI}}_{4}$, ${\mathrm{CHCI}}_{3}$,…
The pore structure of the titanosilicate mesoporous molecular sieve [Si, Ti]-MCM-41 has been examined by N2 sorption and 1H NMR. Pore sizes determined by both methods are in good agreement. Titanosilicate MCM-41 has a broader pore size distribution than the purely siliceous material, and the diameter of its pores is l…
The 86-amino acid colicin E9 immunity protein (Im9), which inhibits the DNase activity of colicin E9, has been overexpressed in Escherichia coli and isotopically enriched with 15N and 13C. Using the 3D CBCANH and CBCA(CO)NH experiments, we have almost completely assigned the backbone 13C resonances and extended previo…
The release process for adsorbed IgG molecules on titanium particle surfaces in the presence of pure buffer or IgG molecules in solution was investigated by means of radiolabeling techniques. This study is part of a general investigation of the basic mechanisms underlying exchange processes of adsorbed proteins by mac…
Resin Transfer Molding (RTM) can be described as a two step process: fiber preforming followed by resin infusion and cure. In the first stage, the fabric form making up the preform element is placed in the tool and is compacted due to the pressure from tool closure. During this process, the microstructure, and the res…
The influence of manufacturing variables and different drying conditions on the amount of residual solvents and on other quality characteristics of biodegradable PLA- and PLGA-microspheres was investigated. Empty and BSA-loaded microspheres were prepared by an organic phase separation method using either dichlorometha…
Abstract
Phase behavior and ordering characteristics were reported for poly(γ-benzyl l -glutamate) (PBLG) in a mixed solvent containing a denaturant acid, dichloroacetic acid (DCA), + dichloroethane (DCE). The solutions of PBLG prepared so as to be liquid crystal at room temperature were observed to undergo a reentrant isotrop…
Molecular dynamics computer simulations have been performed on an isolated polyisoprene chain at 298 K. Simulations of polyisoprene in the melt (413 K) and in solution (298 K) have been previously reported. The local dynamics of polyisoprene chains in these three environments are compared. While conformational transit…
Continuous wave electron nuclear double resonance (CW ENDOR) spectra of [delta-15N,epsilon(-14)N]histidine-labeled phthalate dioxygenase (PDO) from Pseudomonas cepacia were recorded and found to be virtually identical to those previously recorded from [delta,epsilon-15N2]histidine-labeled protein [Gurbiel, R. J., Bati…
The iron chlorides FeCl, FeCl 2, and FeCl 3 and their ions FeCl +, FeCl 2 +, FeCl -, FeCl 2 -, and FeCl 3 - were investigated using MP2 and QCISD(T) calculations with double- and triple-ζ basis sets augmented with multiple sets of diffuse and polarization functions. The dissociation enthalpies for FeCl → Fe + Cl, FeCl…
Two tert-butyldiphenylsilyl-protected synthons 7 and 9 are prepared in excellent yields and used in a one-pot synthesis of higher generation polyether dendrons.
The redox chemistry and the changes that occurred within the solids were studied for an excessively exchanged and a nearly stoichiometric CoZSM-5 zeolite as a function of pretreatment, reduction, and reoxidation conditions. Both gravimetric and volumetric techniques were used to determine this chemistry and the stoich…
The crystallinity ( x c ) of high-pressure-crystallized poly(ethylene terephthalate) (PET), which shows values of x c ≅ 0.90 when measured by differential scanning calorimetry (DSC), was examined by means of wide-angle X-ray scattering (WAXS). PET samples crystallized under normal conditions were also investigated by…
Infrared spectroscopy measurements of the kinetics and decomposition pathways of aqueous urea ((NH 2 ) 2 CO, 200−300 °C, 275 bar) and guanidinium nitrate ([(NH 2 ) 3 C]NO 3, 240−300 °C, 275 bar) are described. A Pt/Ir alloy flow cell with diamond wafer windows was used, and heat and fluid transport models show that is…