Figure 4.

Flow control using geometry-based methods. (A) Three nitrocellulose membranes with different lengths are dipped in a volume-limited well to control flow rate and disconnection from the reservoir (reproduced from ref [115] with permission from the Royal Society of Chemistry 2011). (B) Images of sequentially delivered red-, yellow-, and pink-dyed fluids using cellulose shunts (reprinted with permission from ref [119]. Copyright 2013 American Chemical Society). (C) Flow comparison of oleic acid along with width and dot density variation (reprinted from ref [109] with permission from Elsevier, Copyright 2016).