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. Author manuscript; available in PMC: 2020 Dec 16.
Published in final edited form as: Anal Chim Acta. 2019 Aug 17;1089:108–114. doi: 10.1016/j.aca.2019.08.025

Figure 1.

Figure 1.

a) Interfacial tension as of function of pH for droplets of phosphate buffered saline in QX100 Droplet Generation Oil diluted 100 fold by volume with Novec 7500. b) Schematic of droplet sorter using a tapered rail oriented at 45° in relation to the direction of flow. Low pH droplets are indicated in purple while high pH droplets indicated in green. Droplets enter from bottom left channel. Droplets of high pH (low interfacial tension) are only slightly deflected by the rail. However, droplets of low pH (high interfacial tension) enter the rail and follow the rail upwards. The top left inlet, the Oil Entrainment Inlet, allows an independent control of the hydrodynamic drag in the sorting region of the device. The change in shape of the droplets in the rail is exaggerated for illustrative purposes.