  Block copolymer melts offer a unique template to control the position and
alignment of nanoparticles due to their ability to self-assemble into periodic
ordered structures. Active Brownian particles are shown to co-assemble with
block copolymers leading to emergent organised structures. The block copolymer
acts as a soft confinement that can control the self-propulsion of the active
Brownian particles, both for interface-segregated and selective nanoparticles.
At moderate activity regimes, active Brownian particles can form organised
structures such as polarised trains or rotating vortexes. At high activity, the
contrast in the polymeric and colloidal time scales can lead to particle swarms
with distorted block copolymer morphology, due to the competition between the
polymeric self-assembly and the active Brownian self-propulsion.
