Foam fraction as a function of gas velocity, at a liquid velocity of 0.205 cm/s, for a 0.06% wt. SDS + 1.0% wt. 1-Butanol solution, without particles (red, solid circles) and, with 10% volume fraction of solids (From STIM-LAB, = 2.65 g/cc, mean size = 600-850 µm); uncoated or hydrophilic sand (blue, open circles) and resin coated or hydrophobic sand (green diamonds).

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