| SMG | Sulfonated polyacrylamide soft microgel |
| S/SMG | Hydroxysulfobetaine surfactant/soft microgel composite system |
| EOR | Enhanced oil recovery |
| UPLC–ELSD | Ultra-performance liquid chromatography with evaporative light-scattering detection |
| FTIR | Fourier-transform infrared spectroscopy |
| XPS | X-ray photoelectron spectroscopy |
| D50 | Median particle size |
| CS | Surfactant concentration |
| CSMG | Soft microgel concentration |
| Qt | Apparent surfactant uptake amount at time t |
| Qe | Apparent equilibrium surfactant uptake capacity |
| Qe,calc | Calculated apparent equilibrium uptake capacity |
| Qe,exp | Experimental apparent equilibrium uptake capacity |
| Qm | Theoretical maximum apparent uptake capacity |
| Ce | Equilibrium surfactant concentration in the aqueous phase |
| C0 | Initial surfactant concentration |
| Ct | Residual surfactant concentration at time t |
| RD | Particle size retention ratio |
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