Research Article
Experimental Investigation of Coal Dust Wettability Based on Surface Contact Angle
Table 4
Determination results of contact angles of coal samples with different porosities.
| Name of reagents | Contact angle/° | Concentration/% | Coal samples from different work faces | #10301 | #1308 | #7301 |
| Sodium dodecyl sulfate (SDS)/anionic | 0.005 | 16.73 | 19.43 | 26.35 | 0.05 | 13.76 | 12.37 | 17.37 | 0.5 | 0 | 0 | 0 |
| Cetyltrimethyl ammonium bromide (CTAB)/cationic | 0.005 | 12.78 | 14.34 | 19.25 | 0.05 | 8.48 | 7.89 | 9.51 | 0.5 | 0 | 0 | 0 |
| Cocoanut fatty acid diethanolamide (CFAD)/nonionic | 0.005 | 27.23 | 30.59 | 32.27 | 0.05 | 17.87 | 18.65 | 20.92 | 0.5 | 2.01 | 6.08 | 6.64 |
| Dodecyl dimethyl betaine (DDB)/amphoteric | 0.005 | 32.03 | 34.01 | 37.75 | 0.05 | 23.41 | 25.11 | 25.81 | 0.5 | 3.90 | 6.18 | 7.04 |
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