Direct measurement of forces between soft bodies using the Atomic Force Microscope - Experiments and Interpretations
by Professor Derek Chan
Abstract: The Atomic Force Microscope (AFM) has proved to be a most versatile tool in imaging surfaces and moleules and to measure forces between nanoparticles as a function of separation. For solid particles, such force measurements are easy to interpret and understand. However many materials in systems of interest such as in emulsion science and biological systems, the interacting entities are soft and deformable. When such bodies interact in close proximity, they also deform and therefore the interpretation of force measurements need to account for changes in the geometry.
This talk will describe recent work in direct measurement of force between deformable oil droplets in solution that are in relative motion. The rich and complex coupling between surface forces, surface deformation of the droplets and hydrodynamic interactions provide a fertile area for collaboration between experiments and theory.
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