By choosing multiple lipid types and controlling cooling, it
is possible to form multiple types of solid-lipid particles. Coreshell
structures can be made to give an outer shell of one lipid
and an inner core of another lipid. Depending on the melting
points of the chosen lipids, these methods can produce coreshell
particles with solid outer shells and liquid inner cores,
liquid outer shells and solid cores, or solid shells with solid
cores. It is also possible to produce solid-lipid particles with
one lipid randomly dispersed in another lipid. Again, in these
particles, one component can be solid while the other lipid is
liquid