Figure 4 | Scientific Reports

Figure 4

From: The effect of ionic strength on oil adhesion in sandstone – the search for the low salinity mechanism

Figure 4

Adhesion force plotted as a function of salinity: A) Experiment 1 (Sample 1), B) Experiment 2 (Sample 1) and C) Experiment 3 (Sample 2).

Black points represent a series of experiments for decreasing salinity; grey points represent a series for increasing salinity: D) a fit, using Eq. 4, for all of the data from all three experiments. The data were offset with a constant so that adhesion at ~ 3000 ppm was set equal for the three experiments.

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