Journal article

Direct AFM force measurements between air bubbles in aqueous polydisperse sodium poly(styrene sulfonate) solutions: Effect of collision speed, polyelectrolyte concentration and molar mass

Christine Browne, Rico F Tabor, Franz Grieser, Raymond R Dagastine

JOURNAL OF COLLOID AND INTERFACE SCIENCE | ACADEMIC PRESS INC ELSEVIER SCIENCE | Published : 2015

Abstract

Interactions between colliding air bubbles in aqueous solutions of polydisperse sodium poly(styrene sulfonate) (NaPSS) using direct force measurements were studied. The forces measured with deformable interfaces were shown to be more sensitive to the presence of the polyelectrolytes when compared to similar measurements using rigid interfaces. The experimental factors that were examined were NaPSS concentration, bubble collision velocity and polyelectrolyte molar mass. These measurements were then compared with an analytical model based on polyelectrolyte scaling theory in order to explain the effects of concentration and bubble deformation on the interaction between bubbles. Typically struc..

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Funding Acknowledgements

This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF) and in the Materials Characterisation and Fabrication Platform (MCFP) at the University of Melbourne. We thank the Australian Research Council for funding and the PFPC for providing infrastructure support. We thank Professor Regine von Klitzing for useful discussions and we also thank Professor Derek Y.C. Chan for discussions and constructive comments on an earlier draft of the manuscript.