Ionic liquids (ILs) are low melting point organic salts that until recently were thought to have homogeneous microstructure. In recent SANDALS research,1 we showed pure ILs are nanostructured, and self-assemble into bicontinuous phases due to strong ion-ion interactions. Subsequent SANDALS data revealed a simple inorganic salt (6wt% LiNO3) is ¿structure-making¿; IL nanostructure is enhanced as Li+ ions template more-pronounced charge segregation in the bulk.2 In this proposal, we will examine IL nanostructure as a function of dissolved salt by studying IL+inorganic salt mixtures (6wt% Mg[NO3]2, Al[NO3]3, Zn[NO3]2) and compare the structures obtained to the pure ILs.1 This will test concepts of ¿structure-making¿ and ¿structure-breaking¿ ions in non-aqueous solvents that are similar to, but distinct from, Hofmeister effects in water as IL bulk structure is an order of magnitude larger.