ANISOTROPIC LIGHT-SCATTERING IN WATER-ALCOHOL MIXTURES

We have studied the depolarized Rayleigh-Wing light scattering of aque ous solutions of 2-butoxyethanol (C4E1) as a function of the temperatu re and concentration. The measured spectra give information on the rot ational dynamics of water molecules. Their analysis confirm the amphip hilic character of the ethoxylated alcohol molecules that originates m icellar structures. In addition, the water dynamics shows, in agreemen t with recent small angle neutron scattering measurements, the simulta neous presence of micelles and concentration fluctuations. This latter s are dominant at high temperatures when one approaches the demixtion curve.