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Structure of Microemulsion−ABA Triblock Copolymer Networks
Sarraguça, J. M. G.; Pais, A. A. C. C.; Linse, PerStructural equilibrium properties of transient networks formed by microemulsion droplets and ABA triblock copolymers in solution have been studied by Monte Carlo simulation. The droplets were represented by soft spheres, and the polymers were represented by junctions connected by harmonic bonds with an angular potential regulating the intrinsic chain stiffness. The interaction parameters were selected such that...
New insight into the discrimination between omeprazole enantiomers by cyclodext...
Figueiras, A.; Sarraguça, J. M. G.; Pais, A. A. C. C.; Veiga, J. F.; Carvalho, R. A.We report results regarding the use of 1H-NMR spectroscopy in the study of the conformational behaviour and optical activity of omeprazole. Changes in the chemical shifts of chosen atoms reveal that the conformational behaviour of omeprazole is temperature and pH sensitive. Separation and identification of omeprazole enantiomers in the presence of natural and derivative cyclodextrins, such as ß-cyclodextrin (ßC...
Simulation of polyelectrolyte solutions. The density of bound ions
Sarraguça, J. M. G.; Pais, A. A. C. C.We discuss a simple approach to describe the ion density around a polyelectrolyte chain, quantifying bound and bulk counterions, and allowing for the renormalization of the charge in the polyion. This approach is both physically motivated and readily extensible to systems containing other types of highly charged ions. The method addresses the problem in simulation experiments and allows to correlate ion condens...
Cation Association with Sodium Dodecyl Sulfate Micelles As Seen by Lanthanide L...
Tapia, María José; Burrows, Hugh D.; Azenha, M. Emília D. G.; Miguel, M. da Graça; Pais, A. A. C. C.; Sarraguça, J. M. G.The interaction of trivalent lanthanides with sodium dodecyl sulfate micelles (SDS) in aqueous solution has been studied by a variety of experimental techniques. Potentiometric measurements with a sodium selective electrode, steady-state fluorescence spectra of Ce(III), emission lifetime measurements of Ce(III), Tb(III), and Eu(III), and electronic paramagnetic resonance spectra (EPR) of Gd(III) all show that t...
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