Abstract
Light scattering and hydrodynamic measurements determined the weight average micellar weights, aggregation numbers, and extent of hydration of C 16 polyoxyethylene nonionic surfactant micelles in aqueous solution at 25°C. Micellar size decreased with polyoxyethylene chain length, the aggregation number varying from 99 for EO = 17 to 25 for EO = 63; micelles were spherical or nearly spherical. Micellar hydration was estimated from the difference in volumes between hydrated and anhydrous micelles obtained from light scattering and molecular models. Hydration was extensive and varied from 5.2 to 10.5 water molecules per ethylene oxide unit as the hydrophilic chain length increased; most of the water was mechanically trapped in the polyoxyethylene chains.
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