Analysis procedures

Abstract

Aqueous micellar solutions of two nonionic detergents, a-octylwhydroxytetrakis(oxyethy1ene) (C8E4) and a-octyl-whydroxypentakis(oxyethy1ene) (C8E6), have been investigated as a function of temperature by photon correlation spectroscopy, viscosimetry, small-angle neutron scattering, and neutron spin-echo spectroscopy. Increase of scattering intensities and hydrodynamic radii with temperature is a critical phenomenon extending over a wide temperature range and is not due to micellar growth. The spatial arrangement of small micelles in loose clouds, caused by attractive intermicellar interactions, accounts for all observations.