Janus microswimmers were synthesised via Toposelective Nanoparticle Attachment (TNA) following the protocol outlined in. Briefly, SiO 2 -wax Pickering emulsions were prepared by following the recipe of Perro et al. Paraffin wax (455 mg, M.P. 58-62C) was added to a 5 mL water suspension (5 w/v% cleaned SiO 2 particles, 10.8 mg/L didodecyldimethylammonium bromide (DDAB) 72 ), and heated to 75C, then stirred for 15 min at 3000 RPM before vigorous mixing at 11000 RPM for 160 s using an IKA T-25 Digital Ultraturrax. After the emulsifi-cation step, the Pickering emulsion was immediately placed in an ice bath to rapidly solidify the particle-stabilised wax droplets. The emulsion was then washed by sedimentation and decanting in a 0.1 M NaCl solution to remove the cationic surfactant, before further washing in deionised water to remove dissolved salt ions. The SiO 2 -wax colloidosomes were dispersed overnight by gentle agitation in an aqueous solution of the poly(acrylamide)-(hexane-6-amine, propyl-3-dimethyloxysilane, nitrodopamine) based polymer using an orbital mixer.