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Effect of Nanobubbles on Friction Forces between Hydrophobic Surfaces in Water

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Marc A. Hampton, Bogdan C. Donose, Elena Taran and Anh V. Nguyen

Editorial: Journal of Colloid and Interface Science, 329, p.202-207, 2009.


The interaction between hydrophobic surfaces in aqueous solutions is particularly important because it is encountered in many industrial processes. Even though advances in surface science have been tremendous, the nature of the hydrophobic interaction remains one of the greatest challenges. In this work an atomic force microscope (AFM) was used to measure the normal and lateral interactions between a silica bead and a smooth silica substrate hydrophobised by esterification with 1-octanol. The experiments were performed in water and in water after alcohol-water exchange, a method which has been shown to increase the occurrence and size of nanobubbles at the hydrophobic surface and in turn result in a longer range hydrophobic force due to capillary bridge formation. It was found that the alcohol-water exchange had a significant impact on the friction force due to the increased size of the capillary which increased adhesion.

Cuvinte cheie: friction, adhesion, hydrophobic force, alcohol, nanobubble, atomic force microscopy