Table 2. Contact Angle Measurements of a Water Droplet on a Clean Surface of CaCO3 Sensors, Crude Oil Coated Crystals, and Crystals after Surfactant Flooding Experimentsa.
| contact
angle of water on the surface |
|||||
|---|---|---|---|---|---|
| formulation | new crystal | after coating | after QCM-D | estimated oil desorption rate based on QCM-D (g/m2) | estimated oil desorption based on CLSM |
| linear ABS | 52 ± 1° | 95 ± 2° | 59 ± 6° | 0.176 ± 0.009 | 63 ± 2% |
| branched ABS | 53 ± 3° | 96 ± 1° | 79 ± 3° | 0.113 ± 0.00005 | 32 ± 7%° |
a
Estimated crude oil desorption based on fitted QCM-D experimental data and fluorescence images captured before and after QCM-D experiments.