Fig. 1 . Schematic overview of the bacteria separation method.
Particles of two different sizes are shown at different positions
(regions 1,2,3 and 4) of a spiral channel. At region 1 (closer to
inlet), both particle sizes are pre-positioned at the outer wall by the
viscoelastic sheath buffer. As the Dean vortices develop (region 2-4),
the smaller particles (green) are dragged with vortices and migrate
toward the inner wall while the larger particles (red) remain focused at
the outer wall. The larger particles remain focused throughout the
channel length due to a balance between the three dominant forces
(FL, FE and FD)