title: Exploiting non-equilibrium phase separation for self-assembly.
abstract: Demixing can occur in systems of two or more particle species that experience different driving forces, e.g., mixtures of self-propelled active particles or of oppositely charged colloids subject to an electric field. Here we show with macroscopic experiments and computer simulations that the forces underlying such non-equilibrium segregation can be used to control the self-assembly of particles that lack attractive interactions. We demonstrate that, depending on the direction, amplitude and frequency of a periodic external force acting on one particle species, the structures formed by a second, undriven species can range from compact clusters to elongated, string-like patterns.
authors.affiliation: Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA. michael.gruenwald@utah.edu.
authors.forename: Michael
authors.initials: M
authors.lastname: Grünwald
authors.forename: Simon
authors.initials: S
authors.lastname: Tricard
authors.forename: George M
authors.initials: GM
authors.lastname: Whitesides
authors.forename: Phillip L
authors.initials: PL
authors.lastname: Geissler