Periodic Droplet Formation in Chemically Patterned Microchannels

Details Periodic Droplet Formation in Chemically Patterned Microchannels Periodic Droplet Formation in Chemically Patterned Microchannels

2003-05-12

arxiv.org/abs/cond-mat/0305225v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.91.108303

Simulations show that when a phase-separated binary AB fluid is driven to flow past chemically patterned substrates in a microchannel, the fluid exhibits unique morphological instabilities. For the pattern studied, these instabilities give rise to the simultaneous, periodic formation of monodisperse droplets of A-in-B and B-in-A. The system bifurcates between time-independent behavior and different types of regular, non-decaying oscillations in the structural characteristics. The surprisingly complex behavior is observed even in the absence of hydrodynamic interactions and arises from the interplay between the fluid flow and patterned substrate, which introduces non-linearity into the dynamical system.

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