Direct AFM force measurements between air bubbles in aqueous monodisperse sodium poly(styrene sulfonate) solutions
Christine Browne, Rico F Tabor, Franz Grieser, Raymond R Dagastine
JOURNAL OF COLLOID AND INTERFACE SCIENCE | ACADEMIC PRESS INC ELSEVIER SCIENCE | Published : 2015
Structural forces play an important role in the rheology, processing and stability of colloidal systems and complex fluids, with polyelectrolytes representing a key class of structuring colloids. Here, we explore the interactions between soft colloids, in the form of air bubbles, in solutions of monodisperse sodium poly(styrene sulfonate) as a model polyelectrolyte. It is found that by self-consistently modelling the force oscillations due to structuring of the polymer chains along with deformation of the bubbles, it is possible to precisely predict the interaction potential between approaching bubbles. In line with polyelectrolyte scaling theory, two distinct regimes of behaviour are seen, ..View full abstract
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 ARC for funding and the PFPC for providing infrastructure support. CB acknowledges the receipt of an Australian Postgraduate Award.