Controlling drop size and polydispersity using chemically patterned surfaces

Details Controlling drop size and polydispersity using chemically patterned surfaces Controlling drop size and polydispersity using chemically patterned surfaces

2006-11-02

arxiv.org/abs/cond-mat/0611055v1

Langmuir 23, 956 (2007)

Physics

Condensed Matter

Soft Condensed Matter

16 pages, 4 figures, accepted for publication in Langmuir

Scientific paper

10.1021/la062082w

We explore numerically the feasibility of using chemical patterning to control the size and polydispersity of micron-scale drops. The simulations suggest that it is possible to sort drops by size or wetting properties by using an array of hydrophilic stripes of different widths. We also demonstrate that monodisperse drops can be generated by exploiting the pinning of a drop on a hydrophilic stripe. Our results follow from using a lattice Boltzmann algorithm to solve the hydrodynamic equations of motion of the drops and demonstrate the applicability of this approach as a design tool for micofluidic devices with chemically patterned surfaces.

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