Interpreting the dynamic interaction between a very small rising bubble and a hydrophilic titania surface

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Title: Interpreting the dynamic interaction between a very small rising bubble and a hydrophilic titania surface
Author(s): Manica, Rogerio; Parkinson, Luke; Ralston, John; Chan, Derek Y. C.
Abstract: We interpret recent measurements of time-varying interference fringe intensities observed between rising bubbles (diameter 15-120 μm) and a horizontal hydrophilic titania plate to determine the rate of approach of such bubbles to the surface. The bubbles remain spherical because of high Laplace pressures and small buoyancy forces so the approach velocity remains in the Stokes flow regime. The rate of approach of the bubble to the titania plate is controlled by buoyancy force and surface forces such as van der Waals and electric double layer interactions together with a hydrodynamic force arising from the drainage of the thin water film between the bubble and the titania surface. The dynamics are found to be consistent with the no-slip hydrodynamic boundary condition at the surface of the bubble and at the titania plate. However, far from the titania plate the terminal velocities of the rising bubbles suggests that the bubble surfaces are fully mobile with zero tangential stress.
Publication type: Journal article
Source: Journal of Physical Chemistry C, Vol. 114, no. 4 (Feb 2009), pp. 1942-1946
Publication year: 2009
FOR Code(s): 0306 Physical Chemistry (Incl. Structural); 0303 Macromolecular and Materials Chemistry
Keyword(s): Boundary condition; Electric double layer; Stokes flow; Van der Waals forces
Publisher: American Chemical Society
ISSN: 1932-7447
Publisher URL: http://dx.doi.org/10.1021/jp911104b
Peer reviewed