Binding on strong polyelectrolytes of mixed ionic and nonionic surfactants below their critical micelle concentration observed by fluorescence

摘要

The binding of mixed surfactnats of catonic cetyltrimetrylammonium bromide (CTAB)and nonionic octaethylene glycol monododecyl ether (C_(12)E_8)on anionic polyelectrolyte poly[2-acrylamido-2-methylpropanesulfonic acid 9PAMPS)]and fluorophorelabeled copolymers containing about 40 mol% of AMPS was investigated at different mole fractions,Y,of CTAB in the surfactant mixture.The excimer emission of the cationic probe 1-pyrenemethylamine hydrochloride (PyMeA(centre dot)HCl),nonradiative energy transfer (NRET)between pyrene and naphthalene labels and I_1/I_3 of the pyrene label were determined by varying the total surfactant concentration,c_(Surf).