Discrete Magnetic Microfluidics

We are developing a novel method to move and control aqueous drops on superhydrophobic surfaces using magnetic fields. Small water drops (volume 5-15 microliters) that contain fractions of paramagnetic particles as low as 0.1 % in weight can be moved at relatively high speed (7 cm/s) by displacing a permanent magnet placed below the surface. Coalescence of two drops has been demonstrated by moving a drop that contains paramagnetic particles towards an aqueous drop that was previously pinned to a surface defect. This new approach to microfluidics has the advantages of faster and more flexible control over drop movement.

Duration : 0:0:16