Charged Particles on Surfaces: Coexistence of Dilute Phases and Periodic   Structures on Membranes
  We consider a mixture of one neutral and two oppositely charged types of molecules confined to a surface. Using analytical techniques and molecular dynamics simulations, we construct the phase diagram of the system and exhibit the coexistence between a patterned solid phase and a charge-dilute phase. The patterns in the solid phase arise from competition between short-range immiscibility and long-range electrostatic attractions between the charged species. The coexistence between phases leads to observations of stable patterned domains immersed in a neutral matrix background. 
Sharon M. Loverde, Francisco Solis, and Monica Olvera de la Cruz