Table 3. Comparison of IFT Values of Surfactant/Crude Oil and Surfactant/n-Heptane.
| surfactant | IFTs (mN/m) (surfactant/crude oil) | IFTs (mN/m) (surfactant/n-heptane) |
|---|---|---|
| CDEA | 0.032 | 0.033 |
| SDBS | 0.746 | 0.753 |
| LHSB | 0.860 | 0.858 |
| DTAB | 1.218 | 1.227 |
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