Figure 7: Images of TWIST valves
(A) A microfluidic device in PDMS containing five parallel channels (100 um wide, 100 um tall) with TWIST valves; the PDMS channels are bonded to a glass slide and have been filled with food coloring to make them easier to visualize. (B) Top view of a TWIST valve on the device. (C) Bottom view of a channel (100 um wide, 100 um tall) positioned above a TWIST valve; the valve is open. (D) Bottom view of a channel that has been completely closed by rotating the valve (~1440 deg).