Table 4.
Comparison of molecular weight (MW), and critical micelle concentration (CMC) of various surfactants used in the MEs (40 ml water, 20 mg MPP) with their corresponding SORmax, Cmax and Cmax/CMC ratio.
| Characteristic | Surfactant |
|||||||
|---|---|---|---|---|---|---|---|---|
| Lec | Sap | Rhl | SMP | T20 | T80 | S20 | SDS | |
| HLB | 7.0 | 13.5 | 9.5 | 15 | 16.7 | 15 | 8.6 | 40 |
| Viscositya (mPa.s) | 10000 | - | - | - | 250–450 | 375–480 | 4250 | - |
| MW (g M−1) | 644 | 635 | 651 | 580.8 | 1228 | 1310 | 346 | 288.3 |
| CMCb (mM L−1) | 20 | 0.603 | 0.230 | 0.055 | 0.060 | 0.012 | 0.024 | 7.4 |
| SORmax | 200:1 | 200:1 | 1000:1 | 200:1 | 200:1 | 2000:1 | 1000:1 | 200:1 |
| Cmaxc (mM L−1) | 2.000 | 2.493 | 12.158 | 2.725 | 1.290 | 12.084 | 22.876 | 5.497 |
| Cmax/CMC | 0.10 | 4.13 | 52.86 | 6.81 | 26.33 | 710.82 | 953.16 | 0.74 |
a
Viscosity reported at 25°C for commercial pure surfactants.
b
CMC values were adopted from various refrenses as cited in the text.
c
Cmax represents the surfactant concentration at SORmax.