Research on Wetting Mechanism of Monomeric Surfactants on Rock Dust Based on Molecular Simulation
The four surfactants of SDS,SDBS,AEO—7,and DTAB were selected,and the molecular simulation was used to study the mechanism of surfactant action in the wetting process of rock dust.The results show that some surfactants adsorb on the surface of rock dust,while others aggregate in the water phase to form micellar surfactants.Their polar head groups point towards the water phase,while hydrophobic carbon chains are highly intertwined.The polar and non-polar carbon chains are closer to the water phase direction,which is conducive to enhancing the hydrophilicity of the rock dust surface.The wetting process is dominated by electrostatic energy,and the looser the arrangement of hydrophilic head groups at the interface,the more water molecules can be adsorbed around the polar head groups,indicating stronger wettability.SDS,DTAB and AEO—7 solutions all show high wettability in Kaolinite system.Only SDBS solution has advantages in improving the wettability of Muscovite system,and the wetting effect of monomer surfactant on Kaolinite is the best.
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