Pattern formation in binary fluids confined between rough, chemically heterogeneous surfaces

R Verberg*, CM Pooley, JM Yeomans, AC Balazs

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Using a mesoscale model for hydrodynamics, we simulate driven flow of AB binary fluids past surfaces that contain well-defined roughness or asperities. The geometry and wetting properties of the asperities are found to have a dramatic effect on the flow patterns. We isolate conditions where the A fluid forms vertical bands that bridge the asperities and an imposed shear (or pressure gradient) drives the system to form monodisperse droplets of A within the B fluid. The size of the droplets can be tailored by varying the morphology of the asperities. The surfaces needed to create this rich dynamical behavior are used as the stamps in microcontact printing; thus, the parameter space can readily be accessed experimentally, and the predictions suggest an efficient method for forming emulsions with well-controlled morphologies.

Original languageEnglish
Article number184501
Number of pages4
JournalPhysical Review Letters
Issue number18
Publication statusPublished - 29 Oct 2004




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