Dynamic Forces between Bubbles and Surfaces and Hydrodynamic Boundary Conditions
Ofer Manor, Ivan U Vakarelski, Geoffrey W Stevens, Franz Grieser, Raymond R Dagastine, Derek YC Chan
LANGMUIR | AMER CHEMICAL SOC | Published : 2008
A bubble attached to the end of an atomic force microscope cantilever and driven toward or away from a flat mica surface across an aqueous film is used to characterize the dynamic force that arises from hydrodynamic drainage and electrical double layer interactions across the nanometer thick intervening aqueous film. The hydrodynamic response of the air/water interface can range from a classical fully immobile, no-slip surface in the presence of added surfactants to a partially mobile interface in an electrolyte solution without added surfactants. A model that includes the convection and diffusion of trace surface contaminants can account for the observed behavior presented. This model predi..View full abstract
This work is supported in part by the Australian Research Council (ARC) funding through the Particulate Fluids Processing Centre, a Special Research Centre of the ARC, and through the Australian Minerals Science Research Institute which also receives support from AMIRA international and State Governments of Victoria and South Australia. O.M. is supported by a University of Melbourne Postgraduate Research Scholarship. D.Y.C.C. is a Visiting Professor at the National University of Singapore and an Adjunct Professor at the Institute of High Performance Computing.