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From studies via Molecular Dynamics simulations, we report results onstructure and dynamics in mixtures of active colloids and passive polymers thatare confined inside a spherical container with a repulsive boundary. Suchsystems mimic the presence of bacteria in the background of bio-polymers. Allinteractions in the fully passive case are chosen in such a way that inequilibrium coexistence between colloid-rich and polymer-rich phases occurs.For most part of the studies the chosen compositions give rise to Janusstructure; one side of the sphere is occupied by the colloids and the rest bythe polymers. This partially wet situation mimics nearly a neutral wall in thefully passive scenario. Following the introduction of a velocity-aligningactivity to the colloids, the shape of the polymer-rich domain changes to thatof an ellipsoid, around the long axis of which the colloid-rich domain attainsa macroscopic angular momentum. In the steady state, the orientation of thisaxis evolves via diffusion, implying that the passive domain is set into motionas well by the active particles.

Macroscopic rotation of active colloids in a colloid-polymer mixture confined inside a spherical cavity