Impact of surface charge on the motion of light-activated Janus micromotors Tao Huang, Bergoi Ibarlucea, Anja Caspari, Alla Synytska, Gianaurelio Cuniberti, Joost de Graaf and Larysa Baraban Eur. Phys. J. E, 44 3 (2021) 39 Published online: 23 March 2021 DOI: 10.1140/epje/s10189-021-00008-x