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. 2013 Jun 20;3:2037. doi: 10.1038/srep02037

Figure 5. Visualization of electroosmotic flow inside a pipette tip and the effect of pH on the charge of a droplet.

Figure 5

(a) Numerical modeling of the electroosmotic flow (b) Electroosmotic flow visualization using fluorescent dye (Rhodamine 6G). Ag|AgCl electrodes were used to avoid electrolysis; distance between electrodes 18 mm; applied voltage 30 V. (c) Effects of pH on charges of 7-μL droplets (RH = 50%).