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Phase separation in binary mixtures in the presence of Janus particles hasbeen studied in terms of a Cahn-Hilliard model coupled to the Langevinequations describing the particle dynamics. We demonstrate that the phaseseparation process is arrested leading to unexpected regular stripe patterns inthe concentration field. The underlying pattern forming mechanism has beenelucidated: The twofold absorption properties on the surface of Janus particleswith respect to the two components of a binary mixture trigger in theirneighborhood spatial concentration variations. They result in an effectiveinteraction between the particles mediated by the binary mixture. Our findingsopen a route to design composite materials with nanoscale lamellar morphologieswhere the pattern wavelength can be tuned by changing the wetting properties ofthe Janus particles.

Periodic structures in binary mixtures enforced by Janus particles