ADHESION OF PARTICLES OF DIFFERENT DEGREES OF HYDROPHOBICITY TO A BUBBLE IN A COLLISION

The adhesion of hydrophobic particles to a bubble in a collision has b een studied theoretically. The role of hydrophobicity is manifested in the slip of the liquid relative to the solid surface and an increase in the critical thickness of the interlayer; after this thickness has been reached a breach of the interlayer takes place with the formation of a contact angle. An expression is derived for the velocity of appr oach of the particle to the bubble. Analysis of this expression shows that from the standpoint of the approach dynamics, hydrophobicity is a relative concept. For particles of different degrees of hydrophobicit y, the adhesion criteria are formulated, and the induction time is ana lyzed.