Effective interactions between chemically active colloids and surfaces

Abstract eng:
Micron-sized particles moving through solution by using self-generated chemical gradients serve as model systems for studying active matter. The self-generated hydrodynamic and chemical fields, which induce particle motion, probe and are modified by the environment, including its boundaries. We show that near a hard planar wall such a particle may exhibit motion with a steady orientation and height above the wall, or motionless, steady “hovering”. Furthermore, when also chemi-osmotic hydrodynamic flow at the wall is induced, we predict that the interplay between this and the self-diffusiophoretic one can be “tuned” by chemical patterning of the wall such that one can achieve controlled motion of the active particle, e.g., the particle following a chemical stripe.

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