Fig. 7

Microscopic images of SDS bulk foam generated in the absence of oil at two salinity levels (5,000 ppm and 35,000 ppm). (a) Microscopic images captured at a fixed magnification, (b) Binary images describing SDS foam bubble structure, (c) Comparison of bubble number at two different salinity levels 5,000 ppm (right) and 35,000 ppm (left).