Aggregation of sodium dodecyl sulfate in poly(ethylene glycol) aqueous solution studied by ~1H NMR spectroscopy

摘要

~1H NMR self-diffusion coefficient, spin-spin relaxation and two-dimensional nuclear Overhauser enhancement spectroscopy measurements of sodium dodecyl sulfate (SDS) in poly(ethylene glycol) (PEG) aqueous solution show that SDS molecules start to self-aggregate at a concentration of 3.3 mM, which is well below the normal critical micellar concentration (cmc). SDS micelles are formed when the cmc is reached with PEG solubilized in their hydrophobic micellar cores.