LOCATION OF BUTANOL IN MIXED MICELLES WITH ALKYL GLUCOSIDES STUDIED BY SANS

Aqueous micellar solutions of beta-D-octyl glucopyranoside (beta-C(8)G (1)), beta-D-decyl maltopyranoside (beta-C(10)G(2)), and beta-D-dodecy l maltopyranoside (beta-C(12)G(2)) containing 5 wt % of butanol have b een studied by small angle-neutron scattering using contrast matching techniques in order to determine the location of the alcohol molecules in the micelles. At the chosen alcohol content the micelles of all th ree surfactants take on prolate ellipsoidal shape. Using deuterated bu tanol in combination with fully protonated surfactants dissolved in an appropriate mixture of H2O/D2O, it was possible to obtain a scatterin g signal solely due to the alcohol. For all three systems under invest igation, it was found that butanol is incorporated into the amphiphile film and is not solubilized into the hydrophobic core of the micelles .