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Table 5
Optimal NaCl concentration (S*) and optimal interfacial tension (IFT*) with triolein oil at 25 °C for three homologous series of extended surfactants at 0.1 wt% (adapted from Do and Sabatini, 2010).
| Surfactant series | S* (wt%) | IFT* (mN.m−1) |
|---|---|---|
| 1. Alkyl propoxylate surfactant | ||
| C16-xPOsulfate | ||
| C16–2.9PO | 2.0 | 0.052 ± 0.0021 |
| C16–4.5PO | 3.0 | 0.039 ± 0.0013 |
| C16–5.5PO | 2.0 | 0.033 ± 0.0033 |
| C16–8.2PO | 1.3 | 0.13 ± 0.0026 |
| C16–10.7PO | 0.60 | 0.043 ± 0.0009 |
| 2. Alkyl propoxylate ethoxylate surfactant | ||
| C10–xPO–2EOsulfate | ||
| C10–10PO–2EO | 2.5 | 0.0090 ± 0.0004 |
| C10–14PO–2EO | 2.0 | 0.0037 ± 0.0011 |
| C10–18PO–2EO | 0.50 | 0.0014 ± 0.0015 |
| C12–xPO–2EOsulfate | ||
| C12–10PO–2EO | 3.5 | 0.0031 ± 0.0014 |
| C12–12PO–2EO | 2.5 | 0.0023 ± 0.0018 |
| C12–14PO–2EO | 0.50 | 0.0017 ± 0.0006 |
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