Fig. 3.

Microtube-based microfluidic devices for inertial focusing and sorting of microparticles. (A) STmF chips in four different configurations for inertial focusing. The microtubes (ID = 100 μm) were wound into planar spiral, 3D spiral around a cylinder, 3D self-twisted, and 2D serpentine configurations (black arrow indicates inlet). (Insets) Photos of these channels (encircled by orange boxes). (B) Histogram plot presenting the focus efficiency for particles of different diameter and cells tested in various chips. (C) Lateral positions of microbeads of 10 μm and 25 μm in diameter (0.5% concentration for each) in the outlet.