Table 6. ζ-Potential Measurement of Different Colloidal Systems at Ambient Conditionsa.
| ζ-potential (mV) |
|||||
|---|---|---|---|---|---|
| 25 °C |
80 °C |
||||
| sample | systems | without oil | with oil | without oil | with oil |
| 1 | DI water | –2.12 | –2.01 | ||
| 2 | DI + rock | –0.96 | +0.18 | –0.64 | +0.11 |
| 3 | DI + 500 ppm [C12mim]+[Cl]– + rock | +7.89 | +3.87 | +7.33 | +3.42 |
| 4 | SW | +4.80 | +4.51 | ||
| 5 | SW + rock | +18.8 | +12.05 | +18.25 | +11.72 |
| 6 | SW + 500 ppm [C12mim]+[Cl]− | +54.55 | +54.38 | ||
| 7 | SW + rock + 500 ppm [C12mim]+[Cl]− | +58.96 | +48.36 | +58.55 | +48.03 |
| 8 | SW + 500 ppm [C8mim]+[Cl]− | +50.39 | +49.45 | ||
| 9 | SW + rock + 500 ppm [C8mim]+[Cl]− | +55.36 | +46.33 | +54.33 | +44.96 |
| 10 | SW + 500 ppm [C6mim]+[Cl]− | +48.45 | +48.11 | ||
| 11 | SW + rock + 500 ppm [C6mim]+[Cl]− | +53.82 | +44.26 | +53.13 | +43.89 |
| 12 | SW + 500 ppm [C4mim]+[Cl]− | +46.28 | +45.90 | ||
| 13 | SW + rock + 500 ppm [C4mim]+[Cl]− | +51.71 | +41.95 | +51.25 | +41.59 |
a
The standard uncertainties are u(ζ) = 0.1 mV and u(temperature) = 0.2 °C.