The aim of the current project is to probe (at the nanometer length scale) the relationship between the solution structures of a surfactant molecule, the aggregate(s) it forms in solution, and the drug molecules that its aggregate(s) can incorporate. Once this understanding is gain is should be possible to rationalise the design of surfactant-based nanosized colloidal drug delivery systems (such as micelles) and thence to optimize their drug loading. The results of the study will be essential in aiding the rational selection of surfactant micelle to dissolve a particular drug.