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. Author manuscript; available in PMC: 2008 Sep 6.
Published in final edited form as: J Am Chem Soc. 2007 Jun 20;129(28):8825–8835. doi: 10.1021/ja071820f

Figure 4.

Figure 4

(a) Drop formulation. Flow rate profiles of polymer (PEG 3.35k) and salt (ammonium sulfate) of co-flowing aqueous streams being fed into the drop generating nozzle by syringe pumps. The polymer and salt concentrations of the stock solutions are 0.21 mg/ml and 0.14 mg/ml, respectively. (b) Drop storage. A portion of the Phase Chip containing blue dyed drops of the polymer/salt mixture solution stored in the wells. The concentration of ammonium sulfate is determined by measuring the light intensity passing through each stored drop and the concentration of polymer is calculated from the salt concentration because the relative volumetric compositions of each drop are known from Figure 4a. A movie is in S4.4 (c) Light transmittance of the stored drops. The plot shows the light intensity transmitted through each drop in arbitrary units. The brighter drops contain less blue dye, which is proportional to the concentration of ammonium sulfate. (d) Initial concentrations of polymer and salt of the drops stored in wells. Blue diamond; Ammonium Sulfate. Red square; PEG 3.35k.