Advance in the interaction force between bubble and particle and the thinning dynamics of thin liquid film

Interaction force and the thinning rupture dynamics between bubble and particle is the key to reveal the at- tachment mechanism of coal flotation. It is also a research hotspot in the field of flotation colloid chemistry in recent years. To understand the underlying mechanism of flotation,the recent development in the interaction force between bubble and particle and the hydrodynamic drainage models of the thin liquid film were reviewed systematically. For the interaction force,the hydrophobic force is the fundamental driving force overcoming the repulsive DLVO force between bubble and particle,inducing successful attachment. The origin mechanism of the hydrophobic force is not the same at different regimes. The long-ranged hydrophobic force ( >20 nm) is mainly attributed to the bridge of submicron bub- bles or nano-bubbles,while the short-ranged hydrophobic force (