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. 2003 Feb 6;100(4):1499–1504. doi: 10.1073/pnas.0435755100

Figure 4.

Figure 4

Microfluidic devices made by PDMS molding against photoresist patterns fabricated in a single exposure with μFPMs. (A Upper) Top view of a microfluidic device (PDMS replica of Fig. 2A) consisting of five channels (filled with the same blue dye solution) of different height (left to right): 5.4, 7.7, 11.1, 13.4, and 18.1 μm. (A Lower) Cross-sectional cut of the PDMS device at the location indicated by the dashed line between the two arrows. (B Left) Top view of a microfluidic device (PDMS replica of Fig. 2D) consisting of three channels (filled with blue, yellow, and red dyes flowing from bottom to top) merging into one; the streams do not mix readily because of laminar flow (see text). (B Right) Three cross-sectional cuts of the PDMS device at the locations indicated by the dashed lines; note how the PDMS walls between the three channels narrow gradually in width (until the channels merge) and height, effectively creating a microtextured channel ceiling (Middle).