Table 2. Composition of the Aqueous Phase in Emulsions (Series S2) and Their IFT for Both Series^a.

		IFT, mN/m
sample designation	composition of the aqueous phase	with air	with HCOa
T	2.5 wt % Tween 80b	37.6	8.6
A	2.5 wt % Syntanol ALM10	32.3	2.3
S	2.5 wt % SLES	33.3	3.9
OS	10 wt % OP-7 + 2.5 wt % SLES (1:1)	32.5	1.5
O	10 wt % OP-7	32.7	0.6c
X1	5 wt % Triton X-114	29.7	0.3c
X2	5 wt % Triton X-114 + 0.25 wt % HEC	30.0	0.1c

^aHCO—heavy crude oil.

^bInterpretation of surfactants names—see Table S3 in Supporting Information.

^cThese values lie under the specified limit of the force tensiometer, but due to their reproducibility, they are used in the paper.