(224c) Localized Colloidal Forces and Hydrodynamic Interactions: How Coupling Produces Adhesive Selectivity and Dynamic Motion Signatures

Colloidal interactions are typically addressed via a mean- field perspective, neglecting interfacial heterogeneities that are ubiquitous in natural systems including those of biology. Such spatial variations in the local interaction give rise to a host of interesting behaviors which are not anticipated, for instance, via classical DLVO theory. These include selective adhesion or aggregation of particles based differences in physical properties that alter either the overall contact area between particles or between a particle and a larger surface. Flow perturbs the interactions and shifts conditions which produce adhesion or lack of it. This talk explores the origins of selectivity in interfacially heterogeneous systems, maps conditions which produce interesting dynamic motion signatures of particles flowing over heterogeneous surfaces (skipping, sliding, rolling, and firm arrest), and draws analogies to biological systems.