We have used Small-Angle Neutron Scattering to investigate the structure of bilayer lipid membranes in aqueous solution. The lipids consist of equimolar concentrations of two molecules DMPG and DMPC (see text). The structures consist of solvent filled cores surrounded by shells composed of the lipid bilayers. In particular the radii of the core and shell thickness are measured as a function of lipid concentration and temperature. Other features which reveal themselves are vesicle forming ability of the lipids, additional larger structures and inter-vesicle interactions at large vesicle concentrations. The study is motivated by the possible use of these systems as delivery vehicles for various beneficial therapeutic compounds.
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