Light scattering of micellar and polyelectrolyte solutions: influence of added salt

摘要: Static and dynamic light-scattering experiments have been carried out in order to study two polyelectrolyte systems: System A consists of globular rigid macroparticles such as micelles system B contains flexible anisotropic polymer chains. The dependence the scattered intensity mutual diffusion coefficient on concentration polyelectrolyte-salt solutions is analyzed terms theoretical models (pair repulsion potential Debye-Huckel approximation). Good fits are obtained at low salt for tetradecyltrimethylammonium bromide series, sodium dodecyl sulfate, tetradecyltrialkylammonium micelle with virial development noninstantaneous diffusivity small ions. ionization degree independent concentration, but it very sensitive size ionic head groups. static properties reported (system B). From q intensity, deduced that chains a “coil” conformation presence excess salt. strength effective polystyrene sulfonate (NaPSS) investigated function NaCl concentration. results indicate splitting relaxation times which depends ratio CpCs where Cp Cs polyion added concentrations, respectively. At last, we present some comments different these charged macromolecule (A role counterions discussed. In particular counterion effects seriously modify dynamics polyions